Stain identification method of sintering machine tail thermal imaging camera device

Abstract

The invention discloses a stain identification method of a sintering machine tail thermal imaging camera device, and belongs to the technical field of sintering machine visual inspection. The stain identification method comprises the following steps that a camera photographs an area, right opposite to the camera, in a protective lens and drives the protective lens to rotate forwards and backwards relative to the camera to obtain pictures needed by stain identification, and a first image frame, a second image frame and a third image frame are obtained in sequence; if the absolute value of the gray level change rate of the pixel points corresponding to the first image frame and the second image frame is larger than a set difference value and the absolute value of the gray level change rate of the pixel points corresponding to the first image frame and the third image frame is smaller than the set difference value, the pixel points are judged to be stain points; and traversing all pixel points on the first image frame to obtain the ratio of the dirty area on the protective lens. According to the scheme, the camera stain identification method is optimally designed, so that the detection accuracy of the cleanliness of the protective lens is improved, and excessive wiping or insufficient cleaning is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sintering machine vision detection, more particularly to a stain identification method for a sintering machine tail thermal imaging camera device. BACKGROUND

[0002] In the field of steel metallurgy, the sintering process is an indispensable link. The sintering machine tail is a typical high-temperature, high-dust, high-corrosion, and high-risk working environment. With the aid of machine vision technology, the burning state of the sintering material layer can be collected in real time. For example, by monitoring the red layer temperature gradient change with an infrared camera, the ignition temperature can be dynamically adjusted, thereby effectively reducing fuel waste and helping operators determine the sintering endpoint position, optimizing air volume, trolley speed, and other parameters to avoid under-burning or over-burning. However, the high-dust and high-temperature environment of the sintering machine tail poses strict requirements on the reliability of the camera application, and the camera needs to be provided with effective dust protection and timely cleaning to meet the camera's requirements for the sampling environment.

[0003] Traditional camera cleaning relies on manual high-altitude operations, and the industrial environment of the sintering machine tail is particularly complex - high temperature, high dust, special space structure, and other factors, which not only greatly increases the safety risk and labor intensity of manual operation, but frequent camera maintenance also increases equipment downtime, directly affecting production continuity. Therefore, dust protection and optimization of the automatic cleaning process of the sintering machine tail camera play an important role in improving production efficiency.

[0004] In other fields, existing research has also provided protective lenses outside the camera, and the protective lenses are cleaned to avoid directly wiping the camera, thereby preventing it from being scratched. Further, the size of the protective lens is increased and it is driven to rotate, and the clean area is in turn directed to the camera, which is used to provide the camera with a clear detection field of view.

[0005] For example, a Chinese patent application with publication number CN115449379A discloses a kind of intelligent monitoring device with dustproof function, including setting camera module and protective shell, the front end of protective shell is equipped with rotating lens, camera module is set in protective shell, camera on camera module is eccentric with rotating lens, the end of protective shell is equipped with end cover, end cover is equipped with through hole opposite to camera;End cover is equipped with cleaning mechanism for cleaning rotating lens.The application guarantees the surface of rotating lens area in front of camera module to be clean, so that the monitoring picture shot by monitoring camera is clear, but the cleanliness detection of camera is realized by the following structure: protective shell is also equipped with cleanliness detector for checking the cleanliness of rotating lens, cleanliness detector is used to detect the surface cleanliness of rotating lens opposite to camera.The camera cleanliness detection method is not suitable for high dust environment of sintering machine tail, and the existing camera cleanliness detection method is also not suitable for detection environment of sintering machine tail. SUMMARY

[0006] 1、Technical scheme to be solved The application provides a kind of sintering machine tail thermal imaging camera device's stain identification method, in the scheme, camera is eccentric with protective lens, the image frame required for stain identification is obtained by driving protective lens relative to camera positive and negative rotation, and the stain identification method of protective lens is optimized and designed, to improve the accuracy of protective lens cleanliness detection, and prevent excessive wiping or insufficient cleaning.

[0007] 2、Technical means adopted To achieve the above object, the technical scheme provided by the application is: The application provides a kind of sintering machine tail thermal imaging camera device's stain identification method, the camera device includes camera, protective lens and driving mechanism, camera is eccentric with protective lens;Driving mechanism is used to drive protective lens to rotate, the identification method is used to identify the stain on protective lens, and specifically includes the following steps: S1, the area in protective lens opposite to camera is photographed by camera, to obtain initial image, i.e. first image frame;S2, make protective lens rotate 5~10 ° relative to camera around its axis, and take photograph again by camera, to obtain second image frame;S3, make protective lens reverse rotation relative to camera again, return to initial position in S1, and camera takes photograph on protective lens again, to obtain third image frame;S4, if the absolute value of corresponding pixel point gray scale change rate of first image frame and second image frame is greater than set difference , and the absolute value of corresponding pixel point gray scale change rate of first image frame and third image frame is less than set difference If the pixel is found to be a stain, then the pixel is determined to be a stain. S5. Traverse all pixels on the first image frame to obtain the percentage of stain area on the protective lens, and determine whether the percentage of stain area on it reaches the set percentage value.

[0008] Furthermore, the difference is set in S4. The value ranges from 8% to 15%, and the difference is set. The value ranges from 0.5% to 2%.

[0009] Furthermore, in this camera device, the camera and the rotating mechanism are arranged from top to bottom inside the protective housing. The front panel of the protective housing has a light-transmitting hole facing the camera. The rotating mechanism includes a drive motor and a spring. The two ends of the spring are correspondingly compressed between the output end of the drive motor and the protective lens, which is used to drive the protective lens to rotate and move it.

[0010] Furthermore, the output end of the drive motor is connected to the sleeve, and a connector is slidably installed inside the sleeve on the side away from the drive motor. The two ends of the spring are correspondingly compressed between the inner side wall of the sleeve and one end of the connector. One end of the connector extends out of the sleeve and is detachably connected to the protective lens.

[0011] Furthermore, the outer diameter of the end of the connector that contacts the spring is larger than the outer diameter of the spring.

[0012] Furthermore, the connector includes a female connector end and a male connector end, one end of the female connector end extends outside the sleeve, and the male connector end is used to lock the protective lens to the female connector end; wherein the female connector end and the male connector end use matching ledger staples.

[0013] Furthermore, a limiting ring is provided at one end of the sleeve near the protective lens to prevent the female end of the connector from coming out of the sleeve.

[0014] Furthermore, the protective housing also includes a cleaning mechanism located below the rotating mechanism, which is used to clean the protective lens; the rotating mechanism and the camera are located on the same side of the protective lens, while the cleaning mechanism is located on the other side of the protective lens.

[0015] Furthermore, the cleaning mechanism includes a cleaning base, which is installed at the bottom of the protective cover. A water washing nozzle, a first scraper, and a second scraper are spaced apart on the cleaning base and are eccentrically positioned relative to the protective lens.

[0016] Furthermore, the light-transmitting hole in the protective cover is surrounded by a flexible pressure ring along its axial direction, which contacts the protective lens, to prevent dust from entering the interior of the protective cover.

[0017] Compared with the prior art, the technical solution provided by this invention has the following advantages: (1) This invention optimizes the stain identification method for protective lenses in a thermal imaging camera device at the tail of a sintering machine. Specifically, a difference is set between the absolute values ​​of the grayscale change rates of corresponding pixels in the first and second image frames, and if the absolute value of the grayscale change rate of the corresponding pixel in the third image frame is less than the set difference, then the pixel is determined to be a stain. This identification method uses three frames of images to form a trajectory vector, which can provide a complete pattern of difference → change → return. It is a closed-loop determination trajectory based on time-series judgment, rather than a static comparison. This invention uses the trajectory consistency function in the image to combine the judgment method of change and regression, combined with the rotation behavior of the stain, to accurately identify stains on the protective lens.

[0018] (2) The present invention provides an optimized design for a thermal imaging camera device for implementing the above-mentioned stain identification method at the tail of a sintering machine. Specifically, the output end of the drive motor is connected to the sleeve, and a connector is slidably installed inside the sleeve on the side away from the drive motor. The two ends of the spring are correspondingly compressed between the inner side wall of the sleeve and one end of the connector. The rotating mechanism can not only drive the protective lens to rotate, but also the spring is further compressed to make room for the connector and the protective lens to be detachably connected. Furthermore, the connector includes a female connector end and a male connector end. One end of the female connector end extends into the inside of the sleeve, and the male connector end is used to lock the protective lens to the female connector end, thereby realizing a quick connection between the protective lens and the connector.

[0019] (3) The present invention further optimizes the design of the thermal imaging camera device at the tail of the sintering machine. Specifically, a cleaning mechanism is provided inside the protective cover below the rotating mechanism. The cleaning mechanism is used to clean the protective lens. The rotating mechanism and the camera are located on the same side of the protective lens, and the cleaning mechanism is located on the other side of the protective lens. The continuous compression between the cleaning mechanism and the protective lens is achieved by the restoring force of the spring. During the rotation of the protective lens relative to the cleaning mechanism, the friction between the two is kept relatively stable to ensure the cleaning effect. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the front side panel of the thermal imaging camera device at the tail of the sintering machine in an embodiment of the present invention when it is opened.

[0021] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the thermal imaging camera device at the tail of the sintering machine according to an embodiment of the present invention from another perspective.

[0022] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the thermal imaging camera device at the tail of the sintering machine in an embodiment of the present invention when the front side plate is closed.

[0023] Figure 4 The image frame is captured by the camera when the protective lens of the sintering machine tail thermal imaging camera device reaches the contamination threshold in an embodiment of the present invention.

[0024] Figure 5 The image frame is captured by the camera when the protective lens is clean in the thermal imaging camera device at the tail of the sintering machine according to an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the cleaning process of the thermal imaging camera at the tail of the sintering machine according to an embodiment of the present invention.

[0026] Figure 7 This is a schematic flowchart of the stain identification method using a thermal imaging camera at the tail of a sintering machine according to an embodiment of the present invention.

[0027] Label Explanation: 1. Protective frame; 101. First support platform; 102. Second support platform; 103. Support base plate; 104. Light transmission hole; 2. Rotating mechanism; 201. Drive motor; 202. Coupling; 203. Sleeve; 204. Spring; 205. Limiting ring; 206. Female end of connector; 207. Male end of connector; 3. Cleaning mechanism; 301. Water spray nozzle; 302. First scraper; 303. Second scraper; 304. Cleaning base; 4. Protective lenses; 5. Camera. Detailed Implementation

[0028] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0029] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0030] It should be noted that the "light-transmitting area in the protective lens 4" referred to in this invention refers to "the area in the protective lens 4 that is directly opposite the light-transmitting hole 104".

[0031] This embodiment provides a method for stain identification using a thermal imaging camera device at the tail of a sintering machine, referring to... Figure 7 As shown, the imaging device includes a camera 5, a protective lens 4, and a drive mechanism 2. The drive mechanism 2 is used to rotate the protective lens 4. The camera 5, which is used for thermal imaging detection at the tail of the sintering machine, is used as the camera for detecting stains on the protective lens 4. The camera 5 and the protective lens 4 are set off-center. This identification method is used to identify stains on the protective lens 4, and specifically includes the following steps: S1, the camera 5 takes a picture of the area of ​​the protective lens 4 that is directly opposite it to obtain an initial image, i.e., the first image frame, denoted as S1. S2. Rotate the protective lens 4 5~10° relative to the camera 5, and take another picture through the camera 5 to obtain the second image frame, denoted as S2. S3. The protective lens 4 is rotated in the opposite direction relative to the camera 5 again, returning to the initial position in S1. The camera 5 takes another picture of the protective lens 4, obtaining the third image frame, denoted as S3. S4. If the absolute value of the grayscale change rate of corresponding pixels in the first image frame and the second image frame is greater than a set difference... Furthermore, the absolute value of the grayscale change rate of corresponding pixels between the first image frame and the third image frame is less than the set difference. S5. In the first image frame, the pixel is determined to be a stain. S6. Traverse all pixels in the first image frame to obtain the percentage of the stain area on the protective lens 4, and determine whether the percentage of the stain area on it reaches the set percentage value.

[0032] The specific considerations for adopting the above-mentioned stain identification method are as follows: Traditional timed cleaning can easily lead to over-cleaning or under-cleaning of the protective lens 4. As mentioned in the background art, this invention is applied to the tail of a sintering machine in a specific environment with high dust levels. The background contains floating fine solid particles and moving equipment, among other interfering factors. When the protective lens 4 reaches a set percentage value (also known as the contamination threshold), the image frame captured by the camera 5 is as follows... Figure 4 As shown, from Figure 4 As can be seen, the image frame captured at this time contains many dust spots, and the protective lens 4 is about to be cleaned. When the protective lens 4 is clean, the image frame captured by camera 5 is as follows: Figure 5 As shown, this can be understood as the image frame obtained after the protective lens 4 has been cleaned.

[0033] The rotation angle θ of the protective lens 4 should preferably be selected as 5~10°. This angle should not be too large to prevent more clean areas from being contaminated during the inspection process. For example, first rotate 5° clockwise to take the second image frame; then rotate 5° counterclockwise to take the third image frame.

[0034] The absolute value of the grayscale change rate of corresponding pixels between the first image frame and the second image frame is greater than the set difference. Furthermore, the absolute value of the grayscale change rate of corresponding pixels between the first image frame and the third image frame is less than the set difference. If so, the pixel is determined to be a stain; the specific processing steps are as follows: Step 1: Image Preprocessing and Registration Image preprocessing includes the following steps: S11 Format normalization: If the image captured by the camera is in color, extract the grayscale channel; S12 Noise suppression: Use Gaussian filtering to smooth high-frequency noise, median filtering to suppress salt-and-pepper noise, or bilateral filtering to retain edge information while denoising, reducing environmental interference such as electromagnetic noise and high-temperature interference in industrial scenes; S13 Enhancement processing: For images with uneven brightness or insufficient contrast, perform histogram equalization or adaptive contrast enhancement to improve the distinction between stains and background.

[0035] Suppose that the second and third image frames have transformation matrices relative to the first image frame. and Image spatial alignment can then be achieved using the following formula: ,

[0036] in and These represent the registered second and third image frames, respectively. The registered images share a unified coordinate reference system with the first image frame, ensuring that pixels at the same location have a temporal correspondence.

[0037] Through the above image preprocessing and registration steps, the three images are unified in grayscale space and spatial coordinate system, thereby effectively improving the accuracy of pollutant detection, the system's adaptability and robustness.

[0038] Step 2: Construct the trajectory response vector at the pixel level For each pixel, construct a sequence of its grayscale values ​​across the three frames. Represent the trajectory of the change of pixels or regions at the same location in the three frames as a vector, as shown in the following expression:

[0039] in, This represents the grayscale value of the pixel in the initial image frame. This represents the grayscale value at the corresponding position in the rotated and registered image. This represents the grayscale value at the corresponding position in the registered image after the lens is repositioned.

[0040] The above process is equivalent to observing the behavior trajectory of a specific pixel after rotation with time and viewpoint. The trajectories of different types of factors are different, as shown in Table 1.

[0041] Step 3: Trajectory Consistency Judgment Function

[0042] Based on trajectory response vector Based on the three differences, the above-mentioned determination function is established.

[0043] in: A value of 1 indicates that the pixel is a stain. A value of 0 indicates that the pixel is not a stain. It is a Boolean condition indicator function, which returns 1 if the condition is met and 0 if the condition is not met. It is expressed as the absolute value of the grayscale change rate of corresponding pixels in the first image frame and the second image frame; : Represents the absolute value of the grayscale change rate of corresponding pixels in the first and third image frames; : This represents the threshold value for a significant change, ranging from 8% to 15%; : This represents the difference threshold for "almost identical", which is also the tolerance for backtracking error, and its value ranges from 0.5% to 2%.

[0044] Table 1 shows the variation of different types of factors across three image frames.

[0045] Traditional stain identification methods mostly rely on difference maps. However, difference maps only show the "difference" between two points in time, which is incomplete and cannot determine whether the current difference is caused by the introduction of a stain or the entry or exit of a background object. This can lead to misjudgments. For example, many dynamic backgrounds, such as dust or moving equipment, are likely to be identified as stains in traditional difference comparisons of two image frames, even though they are not simply stains on the protective lens. This method uses three frames to construct a trajectory vector, providing a complete pattern of difference → change → return—a closed-loop determination trajectory based on temporal analysis, rather than a static comparison. This invention uses a trajectory consistency function to combine change and regression in a joint judgment, combined with the rotational behavior of the stain, to accurately identify stains on the protective lens.

[0046] Step 4: Formation and Area Determination of Polluted Areas Generate a contaminated region mask image, specifically as follows: Position all pixels... Iterate through them one by one and check their results. Record these values ​​to form a binary image with the same size as the image frame:

[0047] when A value of 1 indicates that the location is a suspected contaminated area, while a value of 0 indicates a clean area.

[0048] The noise reduction process for contaminated areas is optimized as follows: Morphological opening operations are performed on the mask image, first eroding and then dilating, to remove small isolated noise points such as single-pixel misjudgments. Adjacent contaminated areas are connected to enhance regional continuity and ensure the integrity of the contaminated areas. Finally, regional filtering morphological opening operations are performed to remove noise.

[0049] Calculate the pollution ratio:

[0050] in, This represents the pollution ratio, which is a value between 0 and 1, indicating the proportion of polluted areas in the first image frame. : The pixel width and number of pixels of the first image frame; The pixel height and number of pixels of the first image frame.

[0051] Based on the detection results identified by the stain recognition method, a decision is made as follows: A threshold is set. This represents the maximum allowable percentage of contamination, i.e., the maximum permissible percentage of contaminated areas in the first image frame, typically ranging from 1% to 3%. If the contamination percentage exceeds this threshold, a cleaning operation is required.

[0052] The judgment logic can be expressed by the following formula:

[0053] The system determines that the proportion of contaminated areas in the currently used light-transmitting area of ​​the protective lens exceeds [a certain percentage]. If the condition is not met, a cleaning control command is triggered; otherwise, cleaning is not required, and the system enters the next detection cycle or maintains its current state.

[0054] The pollution threshold α can be adaptively adjusted according to the on-site environment or set through historical data analysis, and is usually in the range of 1% to 3%.

[0055] Based on the aforementioned stain identification method using the thermal imaging camera at the tail of the sintering machine, the subsequent cleaning process will refer to... Figure 6As shown, the specific details are as follows: The detection frequency of the camera 5 on the light-transmitting area in the protective lens 4 is set. Generally speaking, the detection frequency can be set to once per hour. When the light-transmitting area is detected to reach the contamination threshold α, the rotating mechanism 2 drives the current light-transmitting area in the protective lens 4 to move to the cleaning mechanism 3.

[0056] Generally speaking, the rotating mechanism 2 drives the protective lens 4 to rotate 180° each time; the cleaning mechanism 3 cleans the protective lens 4, and after cleaning, it enters the next cycle.

[0057] Regarding the implementation process of the above-mentioned stain identification method using a thermal imaging camera at the tail of a sintering machine, a thermal imaging camera at the tail of a sintering machine is provided. This device is only a preferred embodiment of the above-mentioned stain identification method and should not be construed as a limitation on the stain identification method.

[0058] Preferred, Reference Figures 1-2 As shown, in the thermal imaging camera device at the tail of the sintering machine, the camera 5 and the rotating mechanism 2 are arranged from top to bottom inside the protective cover 1. The front side plate of the protective cover 1 is provided with a light-transmitting hole 104 facing the camera 5. The rotating mechanism 2 includes a drive motor 201 and a spring 204. The two ends of the spring 204 are correspondingly compressed between the output end of the drive motor 201 and the protective lens 4, which is used to drive the protective lens 4 to rotate and push it to move.

[0059] The protective lens 4 is preferably made of glass material with good light transmittance and high temperature resistance.

[0060] It should be noted that the camera 5 and the protective lens 4 are offset, and generally, the size of the protective lens 4 is larger than the size of the lens in the camera 5. Based on the size and relative position design of the protective lens 4 relative to the lens in the camera 5, when a contaminated area in the protective lens 4 is cleaned, the rotating mechanism 2 drives the protective lens 4 to rotate so that different areas of it are aligned with the lens in the camera 5, allowing other clean areas in the protective lens 4 to become new light-transmitting areas. At the same time, the remaining clean areas in the protective lens 4 continue to provide protection for the camera 5 and meet the light transmission requirements, thus not affecting the normal shooting of the camera 5. Therefore, the production monitoring of the sintering machine tail will not be interrupted due to cleaning. In addition, during the inspection process, the cleanliness of the light-transmitting hole 104 in the protective lens 4 is detected by the camera 5 used for production monitoring, simplifying the structure of the camera device itself.

[0061] It should be noted that the camera device uses a compression spring 204 to create space along its axis, thereby facilitating the replacement of the protective lens 4.

[0062] In a further preferred embodiment, the output end of the drive motor 201 is connected to the sleeve 203. A connector is slidably installed inside the sleeve 203 on the side away from the drive motor 201. The two ends of the spring 204 are correspondingly compressed between the inner side wall of the sleeve 203 and one end of the connector. One end of the connector extends to the outside of the sleeve 203 and is detachably connected to the protective lens 4.

[0063] As an extension, the outer diameter of the end of the connector that contacts the spring 204 is larger than the outer diameter of the spring 204, which helps to improve the stability of the spring 204 during compression and rebound.

[0064] In some embodiments, the connector includes a female connector end 206 and a male connector end 207. One end of the female connector end 206 extends into the sleeve 203, and the male connector end 207 is used to lock the protective lens 4 to the female connector end 206, thereby achieving a detachable connection between the protective lens 4, the female connector end 206, and the male connector end 207. Furthermore, the cooperation between the female connector end 206 and the male connector end 207 also enables a quick and detachable connection between the protective lens 4 and the connector.

[0065] Specifically, the female end 206 and the male end 207 of the connector use matching ledger pins. The specific process of installing the protective lens 4 onto the female end 206 and the male end 207 of the connector is as follows: The center of the protective lens 4 has a connecting hole that matches the outer diameter of the male end 207 of the connector. The male end 207 of the connector passes through the connecting hole in the protective lens 4 and the internal threaded hole in the female end 206 of the connector in sequence. Through the threaded connection between the female end 206 and the male end 207 of the connector, the protective lens 4 is locked between the adjacent end faces of the female end 206 and the male end 207 of the connector.

[0066] More specifically, a retaining ring 205 is provided inside the sleeve 203 near the protective lens 4 to prevent the female end 206 of the connector from coming out of the sleeve 203 and to facilitate the installation of the spring 204. In addition, the retaining ring 205 can also prevent the spring 204 from excessively compressing the female end 206 of the connector.

[0067] As a further preferred embodiment of any of the above-mentioned thermal imaging cameras for the tail of a sintering machine, the protective housing 1 is further provided with a cleaning mechanism 3 located below the rotating mechanism 2. The cleaning mechanism 3 is used to clean the protective lens 4. The rotating mechanism 2 and the camera 5 are located on the same side of the protective lens 4, and the cleaning mechanism 3 is located on the other side of the protective lens 4.

[0068] The rotating mechanism 2 can also drive the protective lens 4 to rotate, so that the area of ​​the lens that needs to be cleaned is screwed into the cleaning mechanism 3, thereby cleaning the dusty areas of the protective lens 4. In addition, the restoring force of the spring 204 can achieve continuous compression between the cleaning mechanism 3 and the protective lens 4, maintaining the relative stability of the friction between the two as the protective lens 4 rotates relative to the cleaning mechanism 3, so as to ensure the cleaning effect.

[0069] As a preferred embodiment of the cleaning mechanism 3, the cleaning mechanism 3 includes a cleaning base 304, which is installed at the bottom of the protective cover 1. The water washing nozzle 301, the first scraper 302 and the second scraper 303 are spaced apart on the cleaning base 304 and are eccentrically arranged with respect to the protective lens 4.

[0070] The specific layout of the water supply pipeline used for the water washing nozzle 301 in the cleaning unit 3 adopts existing technology and will not be described in detail here.

[0071] refer to Figure 1 As shown, the water washing nozzle 301, the first scraper 302, and the second scraper 303 are arranged counterclockwise along the circumference of the protective lens 4. The water washing nozzle 301 is used to spray detergent onto the area of ​​the protective lens 4 to be cleaned; the first scraper 302 scrapes away stains; and the second scraper 303 wipes away water stains. Specifically, the scraping surface of the first scraper 302 is made of rubber and is used to scrape away stains adhering to the surface of the protective lens 4. The scraping surface of the second scraper 303 is made of absorbent material and is used to dilute water stains on the surface of the protective lens 4 so that the protective lens 4 remains dry.

[0072] In other embodiments, reference is made to... Figure 1 , Figure 3 As shown, a flexible pressure ring is provided around the light-transmitting hole 104 in the protective cover 1 along its axial direction to prevent dust from entering the interior of the protective cover 1.

[0073] The flexible pressure ring, which surrounds the light-transmitting hole 104 along its axial direction, further enhances the frictional force between the ring and the protective lens 4. Considering the relative positions of the camera 5 and the cleaning mechanism 3, the flexible pressure ring faces the upper part of the protective lens 4, the cleaning mechanism 3 presses against the lower part of the protective lens 4, and both are located on the same side of the protective lens 4. The connecting member is located on the other side of the protective lens 4, all working together to limit and maintain the stability of the protective lens 4 during rotation. Furthermore, the restoring force of the spring 204 increases the frictional force between the flexible pressure ring and the protective lens 4, further preventing dust from entering the interior of the protective housing 1 from near the light-transmitting hole 104.

[0074] As an extension, the protective housing 1 is a hollow rectangular box structure, including a supporting base plate 103, a supporting top plate, and four side plates. The side plate where the light-transmitting hole 104 is located is called the front side plate. The supporting base plate 103, the supporting top plate, and the four side plates together form an internal hollow rectangular cavity structure. Inside the protective housing 1, from top to bottom, there are also a first supporting platform 101 and a second supporting platform 102 parallel to the supporting base plate 103. The camera 5 is mounted on the first supporting platform 101, the rotating pushing mechanism 2 is mounted on the second supporting platform 102, and the cleaning mechanism 3 is located on the supporting base plate 103.

[0075] The protective cover 1 is divided into layers by setting up a first support platform 101 and a second support platform 102. Except for the end where the protective lens 4 is located, the other parts of each layer are not connected.

[0076] To facilitate the installation of internal components of the protective cover 1, its top plate and some side plates are preferably hinged, which facilitates opening and closing, thereby facilitating the maintenance of internal components of the protective cover 1.

[0077] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A method for stain identification using a thermal imaging camera at the tail of a sintering machine, characterized in that, The camera device includes a camera (5), a protective lens (4), and a drive mechanism (2). The camera (5) and the protective lens (4) are eccentrically positioned. The drive mechanism (2) is used to rotate the protective lens (4). This identification method is used to identify stains on the protective lens (4), and specifically includes the following steps: S1. Take a picture of the area directly opposite the protective lens (4) through the camera (5) to obtain the initial image, i.e. the first image frame; S2. Rotate the protective lens (4) around its axis relative to the camera (5) by 5~10°, and take a picture again through the camera (5) to obtain the second image frame; S3. The protective lens (4) is rotated in the opposite direction relative to the camera (5) again, returning to the initial position in S1. The camera (5) takes a picture of the protective lens (4) again to obtain the third image frame. S4. If the absolute value of the grayscale change rate of corresponding pixels between the first image frame and the second image frame is greater than a set difference... Furthermore, the absolute value of the grayscale change rate of corresponding pixels between the first image frame and the third image frame is less than the set difference. If so, the pixel is determined to be a stain. S5. Traverse all pixels on the first image frame to obtain the percentage of the stain area on the protective lens (4) and determine whether the percentage of the stain area on it reaches the set percentage value.

2. The stain identification method of the thermal imaging camera device at the tail of the sintering machine according to claim 1, characterized in that, In step S4, the difference is set. The value ranges from 8% to 15%, and the difference is set. The value ranges from 0.5% to 2%.

3. The stain identification method of the thermal imaging camera device at the tail of the sintering machine according to claim 1, characterized in that, In this camera device, the camera (5) and the rotating mechanism (2) are arranged from top to bottom inside the protective cover (1). The front side plate of the protective cover (1) is provided with a light-transmitting hole (104) facing the camera (5). The rotating mechanism (2) includes a drive motor (201) and a spring (204). The two ends of the spring (204) are compressed between the output end of the drive motor (201) and the protective lens (4) to drive the protective lens (4) to rotate and move.

4. The stain identification method of the thermal imaging camera device at the tail of the sintering machine according to claim 3, characterized in that, The output end of the drive motor (201) is connected to the sleeve (203). A connector is slidably installed inside the sleeve and on the side away from the drive motor (201). The two ends of the spring (204) are correspondingly compressed between the inner wall of the sleeve (203) and one end of the connector. One end of the connector extends out of the sleeve (203) and is detachably connected to the protective lens (4).

5. The stain identification method of the thermal imaging camera device at the tail of the sintering machine according to claim 4, characterized in that, The outer diameter of the end of the connector that contacts the spring (204) is larger than the outer diameter of the spring (204).

6. The stain identification method of the thermal imaging camera device at the tail of the sintering machine according to claim 4, characterized in that, The connector includes a female connector end (206) and a male connector end (207). One end of the female connector end (206) extends outside the sleeve (203), and the male connector end (207) is used to lock the protective lens (4) to the female connector end (206). The female connector end (206) and the male connector end (207) use matching ledger staples.

7. The stain identification method of the thermal imaging camera device at the tail of the sintering machine according to claim 4, characterized in that, The sleeve (203) is provided with a limiting ring (205) at one end near the protective lens (4) to prevent the female end (206) of the connector from coming out of the sleeve (203).

8. The stain identification method of the thermal imaging camera device at the tail of the sintering machine according to any one of claims 3-7, characterized in that, The protective cover (1) is also provided with a cleaning mechanism (3) located below the rotating mechanism (2). The cleaning mechanism (3) is used to clean the protective lens (4). The rotating mechanism (2) and the camera (5) are located on the same side of the protective lens (4), and the cleaning mechanism (3) is located on the other side of the protective lens (4).

9. The stain identification method of the thermal imaging camera device at the tail of the sintering machine according to claim 8, characterized in that, The cleaning mechanism (3) includes a cleaning base (304), which is installed at the bottom of the protective cover (1). The water washing nozzle (301), the first scraper (302) and the second scraper (303) are spaced apart on the cleaning base (304) and are eccentrically positioned with respect to the protective lens (4).

10. The stain identification method of the thermal imaging camera device at the tail of the sintering machine according to claim 9, characterized in that, The light-transmitting hole (104) in the protective cover (1) is surrounded by a flexible pressure ring that contacts the protective lens (4) along its axial direction, in order to prevent dust from entering the interior of the protective cover (1).

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