Gap measuring device between sizing roller and control roller

Abstract

The application relates to a device for measuring the gap between a sizing roller and a control roller, and belongs to the field of cigarette manufacturing technology. The device comprises a light source, a camera and a host computer. The sizing roller and the control roller are arranged adjacently with a spacing gap, and the rotation shafts of the sizing roller and the control roller are parallel. The light source and the camera are arranged on at least one side of the rotation shaft in the extension direction of the rotation shaft. The camera head of the camera is arranged opposite to the spacing gap and is used for at least shooting image data of the spacing gap. The camera is connected with the host computer. The host computer is used for receiving the image data and determining the comparison result between the spacing gap and a preset gap threshold value based on the image data. The device can improve the accuracy of the measurement result of the spacing gap between the sizing roller and the control roller.

Description

Technical Field

[0001] This application relates to the field of cigarette manufacturing technology, and in particular to a measuring device for the gap between the glue-applying roller and the glue-controlling roller. Background Technology

[0002] In the cigarette rolling process, the gap between the gluing roller and the control roller plays a crucial role in the gluing quality and overall product quality. If the gap is too large, the amount of glue applied will be uneven and excessive, easily leading to problems such as glue overflow and sticking, affecting the cigarette's appearance and subsequent packaging processes. If the gap is too small, insufficient glue supply may result in weak adhesion of the cigarettes, causing quality defects such as wrinkles and glue separation. Therefore, precisely controlling the gap between the gluing roller and the control roller is an important prerequisite for ensuring the stability and consistency of cigarette rolling quality.

[0003] Currently, the measurement of the gap between the glue-applying roller and the control roller on cigarette rolling production lines is mostly done offline manually. Operators need to stop the machine periodically and use traditional measuring tools such as vernier calipers and micrometers to measure the gap between the two rollers. However, manual measurement is greatly affected by the operator's subjective factors and measuring techniques, making it difficult to guarantee measurement accuracy and resulting in low measurement precision. Utility Model Content

[0004] Therefore, it is necessary to provide a measuring device for the gap between the glue-applying roller and the glue-controlling roller, addressing the problem of low measurement accuracy in current two-roller gap measurement methods.

[0005] In a first aspect, this application provides a measuring device for the gap between the glue-applying roller and the glue-controlling roller, including a light source, a camera, and a main control unit;

[0006] The glue-applying roller and the glue-controlling roller are arranged adjacent to each other with a gap between them, and the rotation axes of the glue-applying roller and the glue-controlling roller are parallel.

[0007] Along the extension direction of the rotation axis, the light source and the camera are arranged on at least one side of the rotation axis; the camera's lens is arranged opposite to the gap and is used at least to capture image data of the gap;

[0008] The camera is connected to the main control unit; wherein the main control unit is used to receive the image data and determine the comparison result between the interval gap and the preset gap threshold based on the image data.

[0009] In one embodiment, the device further includes an alarm;

[0010] The alarm is connected to the main control unit.

[0011] In one embodiment, the device further includes an electronic control system;

[0012] The electronic control system is electrically connected to at least one of the light source, the camera, the main controller, and the alarm.

[0013] In one embodiment, the main control unit includes an image processing module and a data processing feedback module;

[0014] The image processing module is connected to the camera and the data processing feedback module, respectively, and the data processing feedback module is connected to the alarm.

[0015] In one embodiment, the camera is also used to photograph the rotating shaft of the glue-applying roller and the rotating shaft of the glue-controlling roller.

[0016] In one embodiment, the camera is fixed to a transparent protective cover that at least partially surrounds the glue-applying roller and the glue-controlling roller.

[0017] In one embodiment, the light source is disposed inside the transparent protective cover.

[0018] In one embodiment, the camera is a high-resolution industrial camera.

[0019] In one embodiment, the host computer is a programmable logic controller.

[0020] In one embodiment, the light source is an annular light source, and in the direction from which the rotation axis of the control roller points to the rotation axis of the application roller, the width of the light-emitting surface of the annular light source is greater than the width of the gap.

[0021] The aforementioned measuring device for the gap between the glue-applying roller and the glue-controlling roller includes a light source, a camera, and a main controller. The glue-applying roller and the glue-controlling roller are arranged adjacent to each other with a gap, and their rotation axes are parallel. A light source and a camera are arranged on at least one side of the rotation axis along its extension direction. The light source improves the lighting conditions of the environment where the glue-applying roller and the glue-controlling roller are located, allowing the camera to capture clearer image data. The camera's lens is positioned opposite the gap and is used to capture image data of the gap. The camera is connected to the main controller, which receives the image data and determines a comparison result between the gap and a preset gap threshold based on the image data. The clearer image data allows the main controller to calculate a more precise width distance of the gap and obtain a more accurate comparison result. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a device for measuring the gap between the glue-applying roller and the glue-controlling roller in one embodiment;

[0024] Figure 2 This is a schematic diagram of the structure of the measuring device for the gap between the glue-applying roller and the glue-controlling roller in another embodiment;

[0025] Figure 3 This is a schematic diagram of the structure of the measuring device for the gap between the glue-applying roller and the glue-controlling roller in another embodiment;

[0026] Figure 4 This is a schematic diagram of the main control unit in one embodiment;

[0027] Figure 5 This is a schematic diagram illustrating the positional relationship between the camera, the glue-applying roller, and the glue-controlling roller in one embodiment.

[0028] Figure 6 This is a schematic diagram showing the variation of the average cigarette ventilation rate under different interval gaps in one embodiment. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] As described in the background section, existing methods for measuring the gap between the gluing roller and the control roller suffer from low accuracy. The inventors have discovered that this problem arises because the gap between them plays a crucial role in the gluing quality and overall product quality of cigarettes during the cigarette rolling process. If the gap is too large, the amount of adhesive applied will be uneven and excessive, easily leading to problems such as adhesive overflow and sticking, affecting the cigarette's appearance and subsequent packaging processes. If the gap is too small, insufficient adhesive supply may result in weak adhesion, causing quality defects such as wrinkles and delamination. Therefore, accurately controlling the gap between the gluing roller and the control roller is a vital prerequisite for ensuring the stability and consistency of cigarette rolling quality. Currently, the measurement of the gap between the gluing roller and the control roller on cigarette rolling production lines is mostly done offline manually. Operators need to periodically stop the machine and use traditional measuring tools such as calipers and micrometers to measure the gap between the two rollers. This method is not only inefficient, but frequent machine stops for measurement also severely impact production progress and increase production costs. Furthermore, manual measurement is greatly affected by the operator's subjective factors and measurement techniques, making it difficult to guarantee measurement accuracy and failing to meet the demands of modern high-speed, high-precision cigarette rolling production. Therefore, there is an urgent need for an online measuring device capable of real-time, accurate measurement of the gap between the gluing roller and the control roller, and achieving automatic feedback adjustment, to improve the quality and efficiency of cigarette rolling production.

[0036] For the reasons mentioned above, the present invention provides a measuring device for the gap between the glue-applying roller and the glue-controlling roller, which aims to improve the measurement accuracy of the gap between the glue-applying roller and the glue-controlling roller.

[0037] See Figure 1 , Figure 1 A schematic diagram of the structure of a measuring device for measuring the gap between the glue-applying roller and the glue-controlling roller in one embodiment of this application is shown. The measuring device 10 for measuring the gap between the glue-applying roller and the glue-controlling roller provided in one embodiment of this application includes a light source 11, a camera 12 and a main controller 13.

[0038] The glue-applying roller 20 and the glue-controlling roller 21 are arranged adjacent to each other with a gap between them, and their rotation axes are parallel. A light source 11 and a camera 12 are arranged on at least one side of the rotation axis along its extension direction. The camera of the camera 12 is arranged opposite to the gap and is used to capture image data of the gap. The camera 12 is connected to the main controller 13. The main controller 13 is used to receive the image data and determine the comparison result between the gap and a preset gap threshold based on the image data.

[0039] It is understandable that the applying roller 20 and the controlling roller 21 are two components installed on the cigarette rolling machine. The rotating shaft 201 of the applying roller 20 and the rotating shaft 211 of the controlling roller 21 are parallel. The cigarette rolling machine also includes glue 22 and a glue cylinder 23. The glue 22 is placed in the glue cylinder 23, and the controlling roller 21 contacts the glue 22 in the glue cylinder 23. When the controlling roller 21 and the applying roller 20 rotate relative to each other, the glue 22 adheres to the controlling roller 21. When the adhered glue 22 rotates to the gap between the applying roller 20 and the controlling roller 21, it will adhere to the applying roller 20, thus allowing the applying roller 20 to apply glue to the cigarettes. The size of the gap controls the amount of glue 22 adhering to the applying roller 20, thereby affecting the quality of the cigarettes. As the adhesive 22 adheres and solidifies, the boundary of the gap between the control roller 21 and the application roller 20 becomes blurred. Therefore, it is necessary to measure and monitor the width of the gap. Thus, the preset gap threshold can be a width distance set by technicians to ensure the quality of the cigarettes.

[0040] It should be noted that, along the extension direction of the rotation axis, the light source 11 and camera 12 are arranged on at least one side of the rotation axis. Specifically, there are several cases: along the extension direction of the rotation axis, the light source 11 and camera 12 are arranged sequentially on the same side of the rotation axis; along the extension direction of the rotation axis, the light source 11 is arranged on one side of the rotation axis and the camera 12 is arranged on the other side of the rotation axis; along the extension direction of the rotation axis, the camera 12 and light source 11 are arranged sequentially on the same side of the rotation axis. Preferably, the arrangement of the light source 11 and camera 12 arranged sequentially on the same side of the rotation axis along the extension direction of the rotation axis allows the gap between the glue roller 20 and the glue control roller 21 to be illuminated by the light source 11, enabling the camera 12 to capture a clearer image of the gap, which facilitates the monitoring of the width between the gaps.

[0041] In addition, the camera 12 and the main control unit 13 can be connected by wired means or by wireless means (such as Bluetooth or local area network). Wired means can improve the data transmission efficiency between the camera 12 and the main control unit 13, while wireless means can reduce structural complexity.

[0042] The aforementioned measuring device for the gap between the glue-applying roller 20 and the glue-controlling roller 21 includes a light source 11, a camera 12, and a main controller 13. The glue-applying roller 20 and the glue-controlling roller 21 are arranged adjacent to each other with a gap, and their rotation axes are parallel. Along the extension direction of the rotation axis, the light source 11 and the camera 12 are arranged on at least one side of the rotation axis. The light source 11 can improve the lighting conditions of the environment where the glue-applying roller 20 and the glue-controlling roller 21 are located, allowing the camera 12 to capture clearer image data. The camera 12's lens is positioned opposite the gap and is used at least to capture image data of the gap. The camera 12 is connected to the main controller 13, which receives the image data and determines the comparison result between the gap and a preset gap threshold based on the image data. The clearer image data allows the main controller 13 to calculate a more precise width distance of the gap and obtain a more accurate comparison result.

[0043] Combination Figure 2 As shown, Figure 2 A schematic diagram of the structure of a measuring device for measuring the gap between the glue-applying roller and the glue-controlling roller is shown in another embodiment of this application. In some embodiments, the measuring device for measuring the gap between the glue-applying roller 20 and the glue-controlling roller 21 further includes an alarm 14.

[0044] The alarm 14 is connected to the main control unit 13.

[0045] It is understandable that the alarm 14 is connected to the main control unit 13. When the main control unit 13 detects that the width of the current interval is less than the preset interval threshold by an amount exceeding the error range, or the width of the current interval is greater than the preset interval threshold by an amount exceeding the error range, it sends an alarm command to the alarm 14, thereby instructing the alarm 14 to alarm according to the preset alarm mode. This allows technicians to respond to the alarm in a timely manner, thereby avoiding any impact on cigarette production.

[0046] Alarm 14 can be adapted to different alarm methods, such as audible and visual alarms, wireless alarms, and wired alarms. Therefore, the connection between alarm 14 and the controller can be wired or wireless. Wired connections improve data transmission efficiency, while wireless connections reduce structural complexity. Alarm methods may include audible alarms via buzzers, visual alarms via LEDs, and alarm messages sent to a technician's terminal.

[0047] Combination Figure 3 As shown, Figure 3A schematic diagram of the structure of a measuring device for measuring the gap between the glue-applying roller and the glue-controlling roller is shown in another embodiment of this application. In some embodiments, the measuring device for measuring the gap between the glue-applying roller 20 and the glue-controlling roller 21 further includes an electronic control system 15.

[0048] The electronic control system 15 is electrically connected to at least one of the light source 11, camera 12, main controller 13 and alarm 14.

[0049] It is understandable that, with the alarm 14 and camera 12 all connected to the main control unit 13 via wires, the electronic control system 15, connected to the alarm 14, can supply power to the alarm 14, camera 12, and main control unit 13. In one embodiment, the light source 11 can also be connected to the main control unit 13, which controls the switching of the light source 11 and adjusts its brightness. Therefore, the electronic control system 15 can also supply power to the light source 11 by connecting to the main control unit 13, thereby reducing the number of wiring connections and lowering structural complexity. In one embodiment, at least one of the alarm 14, light source 11, and camera 12 may include its own independent power module for power supply, thus eliminating the need for the electronic control system 15 to provide power, which also reduces structural complexity.

[0050] Combination Figure 4 As shown, Figure 4 A schematic diagram of the main control unit 13 in one embodiment of this application is shown. In some embodiments, the main control unit 13 includes an image processing module 132 and a data processing feedback module 131.

[0051] The image processing module 132 is connected to the camera 12 and the data processing feedback module 131, and the data processing feedback module 131 is connected to the alarm 14.

[0052] In one exemplary embodiment, camera 12 is also used to capture images of the rotation shaft 201 of the applying roller 20 and the rotation shaft 211 of the control roller 21. It is understood that camera 12 can also be used to capture images of the complete applying roller 20 and control roller 21, facilitating the acquisition of more complete image data for accurate calculation of the gap.

[0053] It should be noted that the image processing module 132 uses a high-performance image processor with built-in image recognition and analysis algorithms. Since the camera 12 is also used to capture images of the rotating shaft 201 of the glue-applying roller 20 and the rotating shaft 211 of the glue-controlling roller 21, the image data includes images of the rotating shafts and the glue-controlling roller 21. After receiving the image data, the image processing module 132 first performs preprocessing such as noise reduction and enhancement on the image data, and then uses algorithms to accurately identify the centers of the glue-applying roller 20 and the glue-controlling roller 21, thereby obtaining the gap data between the two rollers. The control process for online measurement of the glue-applying roller 20 and the glue-controlling roller 21 includes: reading image data, correcting the image data using a hypothetical perspective transformation matrix, converting the corrected image data into a grayscale image and performing Gaussian filtering noise reduction on the grayscale image, and further, based on the known radii of the two concentric circles (rotation axes) of the glue-applying roller 20 and the glue-controlling roller 21, and the respective radii of the glue-applying roller 20 and the glue-controlling roller 21, using Hough circle transform to detect the center of the two concentric circles, thereby obtaining the distance between the centers of the two concentric circles. Based on the radius of the glue-applying roller 20, the radius of the glue-controlling roller 21, and the distance between the centers of the two concentric circles, the width of the gap is calculated, thus obtaining a more accurate measurement result of the gap width.

[0054] In addition, the width measurement result of the gap obtained by the image processing module 132 is compared and analyzed with the preset gap threshold. If the gap exceeds the allowable error range, the module will immediately generate an adjustment signal (alarm command). The alarm 14 prompts the operator to adjust the position of the two rollers to achieve closed-loop control and ensure that the gap between the gluing roller 20 and the control roller 21 is always in a state that meets the production specifications, thereby stabilizing the gluing quality of cigarettes and improving the production efficiency and product qualification rate of cigarette rolling.

[0055] Combination Figure 5 As shown, Figure 5 The diagram shows the positional relationship between the camera 12, the glue-applying roller 20, and the glue-controlling roller 21 in one embodiment of this application. In some embodiments, the camera 12 is fixed to a transparent protective cover 50 that at least partially surrounds the glue-applying roller 20 and the glue-controlling roller 21.

[0056] It is understood that the transparent protective cover 50 can be used to protect the cigarette gluing equipment, including the gluing roller 20 and the control roller 21, or it can be used to protect the cigarette rolling machine, including the cigarette gluing equipment. Preferably, the transparent protective cover 50 surrounds the entire cigarette rolling machine to prevent dust or impurities from affecting the quality of cigarette processing. In addition, the camera 12 is mounted on the transparent protective cover 50 of the cigarette rolling machine, without occupying ground space. Its shooting angle is precisely calibrated to capture images of the gap between the two rollers vertically and stably.

[0057] It should be noted that the transparent protective cover 50 can be made of acrylic, glass, or other materials to ensure that the camera 12 can capture clear image data, further improve the accuracy of the interval measurement results, and facilitate technicians to observe the production status of the cigarette machine.

[0058] Continue reading Figure 5 In some embodiments, the light source 11 is disposed inside the transparent protective cover 50.

[0059] Understandably, the light source 11 is located inside the transparent protective cover 50 near the glue roller 20 and the glue control roller 21, which can increase the brightness of the environment in which the glue roller 20 and the glue control roller 21 are located, making it easier for the camera 12 to capture clearer image data, and further improving the accuracy of the measurement results of the gap.

[0060] In some embodiments, camera 12 is a high-resolution industrial camera.

[0061] Understandably, a high-resolution industrial camera refers to an imaging device specifically designed for applications such as industrial inspection, machine vision, and scientific measurement. It features high pixel density (typically ≥5 megapixels), high imaging accuracy, and stable reliability. Its core characteristic is its ability to capture high-detail images, making it suitable for scenarios such as precision measurement, defect detection, and automated production. Camera 12 utilizes a high-resolution industrial camera, which can further improve the clarity of the captured image data, thereby increasing the accuracy of the interval measurement results.

[0062] In some embodiments, the main controller 13 is a programmable logic controller.

[0063] Understandably, a programmable logic controller (PLC) editor can be used. PLC editors offer strong real-time performance, fast response speeds, high-speed scan cycles, and efficient logic processing capabilities. They can quickly receive image data transmitted from camera 12 and immediately process and judge it, meeting the needs of dynamic monitoring and real-time adjustment. Furthermore, PLC editors provide rich input / output interfaces and communication protocols, facilitating seamless integration with peripheral devices such as light source 11 control and motor drives, achieving integrated control. As system requirements change, the PLC editor's modules can be easily expanded or new functions added without replacing the entire main controller 13, improving investment utilization.

[0064] Continue reading Figure 3 In some embodiments, the light source 11 is an annular light source 11, and in the direction from the rotation axis 211 of the control roller 21 to the rotation axis 201 of the upper roller 20, the width of the light-emitting surface of the annular light source 11 is greater than the width of the gap.

[0065] It is understandable that by using a ring light source 11, and with the rotation axis of the control roller 21 pointing in the direction of the rotation axis of the upper roller 20, the width of the light-emitting surface of the ring light source 11 is greater than the width of the gap, so that the light from the light source 11 can evenly illuminate the area being photographed, reduce the generation of shadows, thereby obtaining clearer image data and further improving the accuracy of the gap width measurement results.

[0066] In this embodiment, the measuring device for the gap between the gluing roller 20 and the control roller 21 fills the gap measurement method between the gluing roller 20 and the control roller 21, realizing online measurement of the gap between the gluing roller 20 and the control roller 21, providing strong support for cigarette manufacturing process control. In addition, the device is simple to install, low in cost, and easy to maintain.

[0067] In one embodiment, such as Figure 6 The diagram shows the variation of the average cigarette ventilation rate under different intervals. The inventor's experiments revealed... Figure 6 Within-group ANOVA showed that compared to 20-mil, there were highly significant differences in 7 trials, significant differences in 2 trials, and no difference in 1 trial. Compared to 10-mil, there were highly significant differences in 6 trials, significant differences in 2 trials, and no difference in 2 trials. Compared to 10-mil, all 10 trials showed highly significant differences. Between-group ANOVA showed that the p-values ​​between any two different gaps were less than 0.01. The mean ventilation rate was: 30-mil < 20-mil < 10-mil. The ventilation rate decreased as the gap between the control roller 21 and the glue roller 20 increased, but the control roller 21 and the glue roller 20 wore out faster after the gap was reduced. Observation of cigarette rolling quality revealed that the leakage rate increased significantly at 10-mil, indicating that the small gap and insufficient glue application led to poor adhesion of the splicing paper.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A device for measuring the gap between a sizing roller and a control roller, characterized in that, The device includes a light source, a camera, and a main control unit; The glue-applying roller and the glue-controlling roller are arranged adjacent to each other with a gap between them, and the rotation axes of the glue-applying roller and the glue-controlling roller are parallel. Along the extension direction of the rotation axis, the light source and the camera are arranged on at least one side of the rotation axis; the camera's lens is arranged opposite to the gap and is used at least to capture image data of the gap; The camera is connected to the main control unit; wherein the main control unit is used to receive the image data and determine the comparison result between the interval gap and the preset gap threshold based on the image data.

2. The measuring device for the gap between the glue-applying roller and the glue-controlling roller according to claim 1, characterized in that, The device also includes an alarm; The alarm is connected to the main control unit.

3. The measuring device for the gap between the glue-applying roller and the glue-controlling roller according to claim 2, characterized in that, The device also includes an electronic control system; The electronic control system is electrically connected to at least one of the light source, the camera, the main controller, and the alarm.

4. The measuring device for the gap between the glue-applying roller and the glue-controlling roller according to claim 2, characterized in that, The main control unit includes an image processing module and a data processing feedback module; The image processing module is connected to the camera and the data processing feedback module, respectively, and the data processing feedback module is also connected to the alarm.

5. The device for measuring the gap between the sizing roll and the kiss roll according to claim 1, wherein The camera is also used to photograph the rotating shaft of the glue-applying roller and the rotating shaft of the glue-controlling roller.

6. The device for measuring the gap between the sizing roll and the kiss roll according to claim 1, wherein The camera is fixed to a transparent protective cover that at least partially surrounds the top roller and the control roller.

7. The device for measuring the gap between the sizing roll and the kiss roll according to claim 6, characterized in that, The light source is located inside the transparent protective cover.

8. The measuring device for the gap between the glue-applying roller and the glue-controlling roller according to claim 1, characterized in that, The camera is a high-resolution industrial camera.

9. The measuring device for the gap between the glue-applying roller and the glue-controlling roller according to claim 1, characterized in that, The main controller is a programmable logic controller.

10. The device for measuring the gap between the sizing roll and the kiss roll according to claim 1, characterized in that, The light source is a ring light source, and in the direction from the rotation axis of the control roller to the rotation axis of the top roller, the width of the light-emitting surface of the ring light source is greater than the width of the gap.

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