Optical glass cleaning apparatus and method

Abstract

The application discloses an optical glass cleaning device and method, which comprises a visual detection system, a plurality of cleaning units arranged in sequence along the transmission direction of the optical glass, and a drying unit corresponding to part of the cleaning units; the visual detection system comprises a plurality of image acquisition devices, each of which is arranged downstream of the corresponding drying unit; each image acquisition device is in control connection with the corresponding cleaning unit located upstream thereof, and is used for adjusting the process parameters of the upstream cleaning unit according to the acquired image information. The application sets the image acquisition device downstream of the drying unit, extracts the distribution of dirt residues by using the image registration comparison before and after cleaning, classifies the modeling of the dirt types, greatly reduces the algorithm development difficulty and system implementation cost, and realizes the closed-loop feedback control of each cleaning unit. The structure can dynamically adjust the process parameters according to the incoming dirt fluctuation and process efficiency attenuation, avoids insufficient cleaning or excessive cleaning, and realizes on-demand cleaning.

Description

Technical Field

[0001] This invention relates to the field of glass cleaning technology, and more particularly to an optical glass cleaning device and method. Background Technology

[0002] Optical glass is widely used in precision optical instruments, semiconductor manufacturing, display panels, and other fields. Its surface cleanliness directly affects the yield of subsequent processes and product performance. In the industrial cleaning process of optical glass, multi-module combined cleaning equipment is typically used. This involves sequentially performing ultrasonic cleaning, chemical detergent spraying, brush scrubbing, clean water spraying, overflow pure water rinsing, and air-drying to remove various contaminants such as particles, oil films, and chemical residues from the glass surface. Existing cleaning equipment generally adopts an open-loop control method, meaning that the process parameters of each cleaning unit (such as ultrasonic power, detergent flow rate, brush speed, and spray pressure) are preset during the equipment commissioning phase and remain unchanged during the cleaning process. However, in actual production, the degree of contamination of incoming optical glass fluctuates significantly, and the efficiency of each cleaning unit decreases over time. Fixed parameter mode is difficult to adapt to these changes, resulting in two typical problems: First, when the incoming material is heavily contaminated or the efficiency of a certain unit decreases, the cleaning effect is not up to standard, requiring rewashing or even scrapping; Second, when the incoming material has a high degree of cleanliness, the cleaning unit still operates at rated power, resulting in a waste of energy and consumables.

[0003] To address these issues, some equipment attempts to add visual inspection devices at the end of the cleaning process for final inspection. However, this method can only detect defective products and cannot provide real-time intervention in the cleaning process or pinpoint changes in cleaning efficiency at each stage. Another solution proposes installing visual inspection devices at the entrances and exits of each module to identify dirt types and provide feedback for adjustments. However, this approach faces the following technical challenges: different dirt types require separate modeling and training, resulting in high algorithm development costs and poor adaptability; multi-station inspection leads to significant hardware investment and system complexity; and the inspection results are mostly absolute values, making it difficult to distinguish between excessive incoming material dirt and insufficient cleaning capacity in the current process. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention proposes an optical glass cleaning device and method.

[0005] The present invention proposes an optical glass cleaning device, including a vision inspection system, multiple cleaning units arranged sequentially along the optical glass transport direction, and a drying unit corresponding to some of the cleaning units; the vision inspection system includes multiple image acquisition devices, each of which is located downstream of a corresponding drying unit; each image acquisition device is controlled and connected to the cleaning unit located upstream of it, and is used to adjust the process parameters of its upstream cleaning unit according to the acquired image information.

[0006] Preferably, the visual inspection system further includes an image processing unit and a control unit. The image acquisition device is arranged downstream of the cleaning unit to acquire image information of the optical glass surface. The image processing unit is communicatively connected to the image acquisition device and is used to perform registration processing on the acquired image information and extract the distribution of dirt residue on the optical glass surface. The control unit is communicatively connected to the image processing unit and each cleaning unit respectively and is used to generate adjustment instructions according to the distribution of dirt residue and send them to the corresponding cleaning unit to adjust its process parameters.

[0007] Preferably, the image processing unit includes a registration module and an extraction module. The registration module is used to register the image information collected at different work stations with the reference image information collected before the optical glass is cleaned, and generate a registered image pair. The extraction module is communicatively connected to the registration module and is used to extract the distribution of dirt residue on the surface of the optical glass based on the registered image pair.

[0008] Preferably, the control unit includes a distribution analysis module and an instruction generation module. The distribution analysis module is communicatively connected to the image processing unit and is used to generate a dirt residue heat map based on the dirt residue distribution. The instruction generation module is communicatively connected to the distribution analysis module and is used to generate adjustment instructions corresponding to each cleaning unit based on the dirt residue heat map, and send the adjustment instructions to the corresponding cleaning unit.

[0009] Preferably, the multiple cleaning units sequentially include an ultrasonic cleaning unit, a chemical detergent spray cleaning unit, a brush cleaning unit, a clean water spray cleaning unit, and an overflow pure water cleaning unit along the optical glass transmission direction; the chemical detergent spray cleaning unit is used to spray detergent onto the optical glass; the brush cleaning unit is used to brush the surface of the optical glass; the clean water spray cleaning unit is used to rinse away residual detergent and dirt; the overflow pure water cleaning unit is used to rinse the optical glass with overflow pure water; the drying unit includes a first air-cutting water blowing unit, a second air-cutting water blowing unit, and a third air-cutting water blowing unit, with the first air-cutting water blowing unit correspondingly located downstream of the ultrasonic cleaning unit, the second air-cutting water blowing unit correspondingly located downstream of the brush cleaning unit, and the third air-cutting water blowing unit correspondingly located downstream of the overflow pure water cleaning unit.

[0010] Preferably, the ultrasonic cleaning unit has a frame and a rubber roller, an ultrasonic generator, a water tank and several vibrating heads mounted on the frame. The vibrating heads are arranged in the water tank. The ultrasonic generator is electrically connected to the vibrating heads to control the vibrating heads to generate ultrasonic waves. The rubber roller is provided in two sets, which are respectively arranged at the frame inlet and frame outlet.

[0011] The present invention also provides an optical glass cleaning method, using the above-mentioned optical glass cleaning equipment, comprising the following steps: S1. Send the glass into the inlet and capture the first image before cleaning; S2. Perform a first cleaning process and a first drying process on the glass in sequence. After the first drying process, acquire a second image, pair the first image and the second image, and adjust the parameters of the first cleaning process according to the pairing result. S3. Perform a second cleaning process and a second drying process on the optical glass in sequence. After the second drying process, acquire a third image, pair the first image and the third image, and adjust the parameters of the second cleaning process according to the pairing result. S4. Perform the third cleaning process and the third drying process on the glass in sequence. After the third drying process, acquire the fourth image, pair the fourth image with the first image, and adjust the parameters of the third cleaning process according to the pairing result. S5, Output clean optical glass after cleaning.

[0012] Preferably, the pairing of the first image and the second image / third image / fourth image specifically involves registering the second image / third image / fourth image with the first image to generate a first registered image pair / second registered image pair / third registered image pair, and extracting the first dirt residue distribution / second dirt residue distribution / third dirt residue distribution on the optical glass surface based on the first registered image pair / second registered image pair / third registered image pair as the pairing result.

[0013] Preferably, the first cleaning process specifically involves conveying the optical glass into a water tank, using an ultrasonic generator to drive a vibrating head to generate ultrasonic waves, and the ultrasonic waves generating a cavitation effect in the cleaning liquid in the water tank to act on the surface of the optical glass to initially remove dirt from the surface of the optical glass; the second cleaning process specifically involves first spraying cleaning agent onto the surface of the optical glass, and then using a rotating brush to scrub the dirt on the surface of the optical glass; the third cleaning process specifically involves first rinsing with clean water to remove residual cleaning agent and dirt, and then rinsing the optical glass with overflow pure water.

[0014] Preferably, the first drying process is the same as the second and third drying processes, and the first drying process specifically involves using a wind-cutting device to blow away water stains from the surface of the optical glass.

[0015] In this invention, an image acquisition device is installed downstream of the drying unit, and the distribution of residual dirt is extracted by comparing and registering images before and after cleaning, thus achieving closed-loop feedback control for each cleaning unit. This structure can dynamically adjust process parameters according to fluctuations in incoming material dirt and the decline in process efficiency, avoiding under- or over-cleaning and improving the consistency of cleaning results; it also enables on-demand cleaning, reducing energy and material consumption. The image registration and comparison method eliminates the need for classification and modeling of dirt types, significantly reducing algorithm development difficulty and system implementation costs. Multi-station detection can accurately locate specific processes with insufficient efficiency, providing data support for process optimization. Furthermore, the image acquisition device is located only downstream of the drying unit, utilizing dry surface imaging to avoid interference from wet water films, resulting in a simple structure with strong adaptability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cleaning units and image acquisition device of the optical glass cleaning equipment proposed in this invention; Figure 2 This is a schematic diagram of the ultrasonic cleaning unit of the optical glass cleaning device proposed in this invention; Figure 3 This is a schematic diagram of the control process of the visual inspection system and cleaning unit of the optical glass cleaning equipment proposed in this invention. Figure 4 This is a flowchart of the optical glass cleaning method proposed in this invention. Detailed Implementation

[0017] Reference Figures 1-3 This invention proposes an optical glass cleaning device, comprising a vision inspection system 3, a plurality of cleaning units 1 arranged sequentially along the optical glass transport direction, and a drying unit 2 corresponding to some of the cleaning units 1; wherein, the plurality of cleaning units 1 sequentially include an ultrasonic cleaning unit 11, a chemical detergent spray cleaning unit 12, a brush cleaning unit 13, a clean water spray cleaning unit 14, and an overflow pure water cleaning unit 15 along the optical glass transport direction; specifically, as shown... Figure 2The ultrasonic cleaning unit 11 includes a frame 111 and, mounted on the frame 111, rubber rollers 112, an ultrasonic generator 113, a water tank 114, and several vibrating heads 115. Two sets of rubber rollers 112 are respectively arranged at the inlet and outlet of the frame 111. During transport, the optical glass passes through the two vertically distributed rubber rollers 112. The squeezing action of the two rollers removes water stains from the surface of the optical glass. The vibrating heads 115 are arranged in the water tank 114. The ultrasonic generator 113 is electrically connected to the vibrating heads 115 to control the generation of ultrasonic waves. During the cleaning process, the ultrasonic generator 113 drives the vibrating heads 115 to generate ultrasonic waves. These ultrasonic waves create a cavitation effect in the cleaning fluid. The energy released by the collapse of cavitation bubbles acts on the surface of the optical glass, peeling off loose dirt such as tiny particles and dust adhering to the glass surface, thus achieving preliminary cleaning.

[0018] The chemical cleaning agent spraying unit 12 can spray chemical cleaning agents onto the optical glass surface. Through the wetting, emulsifying and dispersing effects of the cleaning agent, it dissolves or softens stubborn dirt such as oil film, fingerprints, and organic residues on the glass surface, thus preparing it for subsequent mechanical brushing.

[0019] The brush cleaning unit 13 uses the relative motion between the rotating brush and the glass surface to utilize the mechanical friction of the brush, combined with the chemical action of the chemical detergent, to completely remove the softened dirt from the glass surface, thereby improving cleaning efficiency.

[0020] The water spray cleaning unit 14 uses high-pressure water spray to rinse away the detergent residue and detached dirt remaining on the glass surface after brushing, preventing detergent residue from entering subsequent processes.

[0021] The overflow pure water cleaning unit 15 uses an overflow method to continuously flow pure water to perform a final rinse on the optical glass, removing trace impurities remaining on the glass surface and ensuring that the glass surface meets the high cleanliness requirements.

[0022] The drying unit 2 includes a first air-cutting water blowing unit 21, a second air-cutting water blowing unit 22, and a third air-cutting water blowing unit 23. The first air-cutting water blowing unit 21 is located downstream of the ultrasonic cleaning unit 11, the second air-cutting water blowing unit 22 is located downstream of the brush cleaning unit 13, and the third air-cutting water blowing unit 23 is located downstream of the overflow pure water cleaning unit 15. The drying unit 2 uses air-cutting water blowing to remove residual cleaning liquid, detergent, or rinsing water from the optical glass surface, restoring the glass surface to a dry state. On the one hand, the drying unit 2 forms an air curtain isolation between adjacent cleaning units 1, preventing the cleaning liquid or detergent from the previous process from being carried into the next process with the glass surface, avoiding the mixing of different cleaning media that could lead to chemical contamination or a decrease in cleaning efficiency, and ensuring the independence and process stability of each cleaning unit; ensuring that the output optical glass surface is free of water stains and residues, directly achieving a clean and dry delivery state, meeting the strict requirements for glass surface cleanliness in subsequent precision processing steps such as coating and lamination. On the other hand, the dry surface formed by the drying unit 2 of the optical glass eliminates the interference of water film on the refraction and scattering of light, ensuring that the subsequent image acquisition device 31 can obtain a clear, high-contrast surface image and avoid the missed detection or false detection of dirt caused by wet imaging.

[0023] like Figure 3 The visual inspection system 3 includes multiple image acquisition devices 31, an image processing unit 32, and a control unit 33. Each image acquisition device 31 is located downstream of its corresponding drying unit 2. Each image acquisition device 31 is controlled and connected to its corresponding cleaning unit upstream, and is used to adjust the process parameters of its upstream cleaning unit based on the acquired image information. The image acquisition devices 31 are arranged downstream of some cleaning units 1 to acquire image information of the optical glass surface. The image processing unit 32 is communicatively connected to the image acquisition devices 31, and is used to perform registration processing on the acquired image information and extract the distribution of dirt residue on the optical glass surface. The control unit 33 is communicatively connected to the image processing unit 32 and each cleaning unit 1, and is used to generate adjustment commands based on the dirt residue distribution and send them to the corresponding cleaning unit 1 to adjust its process parameters.

[0024] This invention utilizes image acquisition devices 31 located downstream of multiple drying units 2 to acquire reference images before cleaning. The cleaned images are then registered and compared with the reference images to extract the distribution of residual dirt as a feedback signal, allowing for real-time adjustment of the process parameters of the corresponding cleaning units. This closed-loop control structure dynamically adjusts the cleaning intensity based on fluctuations in the degree of dirt on the incoming material and the decrease in efficiency of each cleaning unit 1. This effectively avoids the problems of insufficient or excessive cleaning caused by fixed parameters in traditional open-loop control methods, significantly improving the consistency of optical glass cleaning results.

[0025] Specifically, the image processing unit 32 includes a registration module and an extraction module. The registration module is used to register the image information acquired at different workstations with the reference image information acquired before the optical glass cleaning process, generating a registered image pair. Since the optical glass may experience slight offsets, rotations, or speed fluctuations during transmission, directly comparing images acquired at different workstations can lead to positional deviations and misjudgments. The registration module extracts features such as glass edges, corners, or preset reference marks, and then uses affine transformation to strictly align the cleaned image with the reference image in the pixel coordinate system, generating a registered image pair.

[0026] The extraction module is communicatively connected to the registration module and is used to extract the distribution of dirt residue on the surface of the optical glass based on the registered image pair. The extraction module performs pixel-level difference operations on the registered image pair, calculates the difference in grayscale values ​​at corresponding locations, and identifies the difference areas as dirt residue areas according to a preset threshold. The extraction module outputs spatial distribution information of the dirt residue, including features such as dirt location, area, and density, represented in the form of a heatmap or gridded data.

[0027] This invention solves the positional offset problem during transmission by using image registration technology; it adopts a differential comparison method, which eliminates the need for complex classification and modeling of dirt types, and only requires judging the differences between the images before and after cleaning to extract the distribution of dirt residue, which greatly reduces the algorithm development cost and system implementation difficulty.

[0028] The control unit 33 includes a distribution analysis module and an instruction generation module. The distribution analysis module is communicatively connected to the image processing unit 32 and is used to receive and analyze the dirt residue distribution information output by the extraction module. The distribution analysis module converts the dirt residue distribution into a dirt residue heat map, which can intuitively reflect the spatial aggregation characteristics of dirt on the optical glass surface, such as dirt concentrated at the glass edge, leading edge, trailing edge, or randomly distributed. The distribution analysis module can also quantitatively assess the degree of dirt residue and generate a dirt load index.

[0029] The instruction generation module is communicatively connected to the distribution analysis module. It generates adjustment instructions for each cleaning unit based on the residual dirt heat map and sends these instructions to the corresponding cleaning units. The instruction generation module has a built-in process parameter adjustment rule library, matching corresponding adjustment strategies to different spatial distribution characteristics: when residual dirt is concentrated at the glass edge, it generates instructions to adjust the brush pressure or air knife angle; when the overall residual dirt is high, it generates instructions to increase ultrasonic power, increase detergent flow, or decrease transmission speed. The instruction generation module sends the adjustment instructions to the corresponding cleaning unit actuators via an industrial communication protocol, achieving closed-loop feedback control.

[0030] This invention achieves refined and targeted parameter adjustment by associating the spatial distribution characteristics of dirt residue with process parameter adjustment strategies. Through process-level feedback control, it can accurately locate processes with insufficient cleaning efficiency and make targeted adjustments, avoiding the energy waste and process fluctuations caused by blindly adjusting all parameters in the traditional way.

[0031] Furthermore, it is worth noting that each of the aforementioned cleaning units 1 adopts an independent modular design. Different modules can be flexibly selected and combined according to the material, size, type of dirt, and cleanliness requirements of the optical glass, quickly forming a cleaning process adapted to specific process needs without requiring redesign of the entire machine, thus shortening the equipment delivery cycle. Each module has an independent structural frame and interface. When a module malfunctions or experiences performance degradation, it can be disassembled and replaced individually or repaired offline without requiring a complete shutdown for disassembly and reassembly, significantly reducing equipment maintenance time and improving the overall utilization rate of the equipment.

[0032] This invention sets up detection points after each key cleaning process. By extracting the distribution of dirt residue at each stage, it can accurately pinpoint the specific process with insufficient cleaning efficiency. For example, if the dirt residue is high after ultrasonic cleaning, the ultrasonic parameters can be increased; if the residue is high after brushing, the brush speed or detergent flow rate can be adjusted. This process-level diagnostic capability provides data support for equipment maintenance and process optimization, avoiding the inefficient operation of blindly adjusting all parameters due to the inability to locate the problematic process, as is common in traditional methods.

[0033] The optical glass cleaning equipment described above will be used in conjunction with the present invention. Figure 4 A detailed description of an optical glass cleaning method is provided below, with the specific steps as follows: S1. Send the glass into the inlet and capture the first image before cleaning.

[0034] In this step, the optical glass is conveyed into the inlet of the cleaning equipment by a roller conveyor. Before entering the ultrasonic cleaning unit 11, the first image acquisition device 311 acquires a first image of the optical glass surface. This first image serves as the reference image for all subsequent registration and comparison, characterizing the initial dirt state of the optical glass before cleaning.

[0035] To obtain high-quality image information, in this embodiment, the first image acquisition device 31 uses a line scan camera in conjunction with a high-brightness transmission light source to acquire high-resolution, low-distortion surface images in a dry glass state, ensuring the authenticity and integrity of the reference image.

[0036] S2. Perform a first cleaning process and a first drying process on the glass in sequence. After the first drying process, acquire a second image, pair the first image and the second image, and adjust the parameters of the first cleaning process according to the pairing result.

[0037] The specific process is as follows: The optical glass enters the ultrasonic cleaning unit 11 and is transported to the water tank 114. The ultrasonic generator 113 drives the vibrating head 115 to generate ultrasonic waves. The ultrasonic waves generate a cavitation effect in the cleaning fluid in the water tank 114. The energy released by the collapse of the cavitation bubbles acts on the surface of the optical glass, initially removing loose dirt such as tiny particles and dust adhering to the glass surface. After ultrasonic cleaning is completed, the glass enters the first air-cutting and water-blowing unit 21, where an air-cutting device blows away the residual cleaning fluid on the glass surface, restoring the glass surface to a dry state.

[0038] At the outlet of the first air-cutting and water-blowing unit 21, the second image acquisition device 312 acquires a second image of the optical glass surface (configured the same as the first image acquisition device 311, using a line scan camera with a high-brightness transmitted light source). The image processing unit 32 performs image registration between the second image and the first image acquired in step S1. By extracting features such as glass edges or preset reference marks, the second image and the first image are strictly aligned in the pixel coordinate system to generate a first registered image pair. The extraction module performs pixel-level difference operations based on the first registered image pair, calculates the difference in grayscale values ​​at corresponding positions, and extracts the first distribution of dirt residue on the optical glass surface.

[0039] The control unit 33 generates adjustment commands based on the first dirt residue distribution and sends them to the ultrasonic cleaning unit 11. When the first dirt residue distribution indicates a high overall residue on the glass surface, the control unit 33 adjusts the ultrasonic generator 113 to increase the output power or extend the ultrasonic action time; when the dirt residue is concentrated in a specific area of ​​the glass, the local working state of the vibrating head 115 can be adjusted according to the distribution characteristics. This feedback adjustment ensures that the process parameters of the ultrasonic cleaning unit 11 match the actual cleaning requirements.

[0040] S3. Perform a second cleaning process and a second drying process on the optical glass in sequence. After the second drying process, acquire a third image, pair the first image and the third image, and adjust the parameters of the second cleaning process according to the pairing result.

[0041] The specific process is as follows: After the glass has undergone the first drying treatment, it sequentially enters the chemical cleaning agent spray cleaning unit 12 and the brush cleaning unit 13. The chemical cleaning agent spray cleaning unit 12 sprays chemical cleaning agents onto the glass surface. Through the wetting, emulsifying, and dispersing effects of the cleaning agent, stubborn dirt such as oil film, fingerprints, and organic residues on the glass surface are dissolved or softened. Subsequently, the brush cleaning unit 13 uses rotating brushes to generate relative motion with the glass surface, and utilizes the mechanical friction of the brushes to completely remove the softened dirt from the glass surface.

[0042] After the detergent spraying and brushing are completed, the glass enters the second air-cutting and water-blowing unit 22, where an air-cutting device blows away any residual detergent from the glass surface, restoring it to a dry state. At the outlet of the second air-cutting and water-blowing unit 22, a third image acquisition device 313 acquires a third image of the optical glass surface (configured the same as the first image acquisition device 311, using a line scan camera with a high-brightness transmitted light source). The image processing unit 32 performs image registration between the third image and the first image, generating a second registered image pair, and extracts the second distribution of residual dirt on the optical glass surface based on the second registered image pair.

[0043] The control unit 33 generates adjustment commands based on the second dirt residue distribution and sends them to the chemical cleaning agent spray cleaning unit 12 and the brush cleaning unit 13, respectively. When the second dirt residue distribution shows a high level of oil film residue, the control unit 33 adjusts the chemical cleaning agent spray cleaning unit 12 to increase the cleaning agent flow rate or concentration; when it shows a high level of particulate residue, it adjusts the brush cleaning unit 13 to increase the brush rotation speed or brushing pressure; when the dirt residue is concentrated at the glass edge, it adjusts the downward pressure distribution of the brush or adjusts the glass conveying speed. This feedback adjustment ensures that the process parameters of the second cleaning treatment are precisely matched with the actual dirt condition of the glass surface.

[0044] S4. Perform the third cleaning process and the third drying process on the glass in sequence. After the third drying process, acquire the fourth image, pair the fourth image with the first image, and adjust the parameters of the third cleaning process according to the pairing result.

[0045] The specific process is as follows: After the second drying process, the glass sequentially enters the clean water spray cleaning unit 14 and the overflow pure water cleaning unit 15. The clean water spray cleaning unit 14 uses high-pressure clean water spray to rinse away the detergent residue and loosened dirt remaining on the glass surface after brushing. Subsequently, the glass enters the overflow pure water cleaning unit 15, where pure water is continuously flowing through the overflow to perform a final rinse on the optical glass, removing trace impurities remaining on the glass surface and ensuring that the glass surface meets the high cleanliness requirements.

[0046] After water spraying and overflow rinsing, the glass enters the third air-cutting and water-blowing unit 23, where air-cutting equipment thoroughly blows away any residual pure water from the glass surface, ensuring the glass surface is completely dry. At the outlet of the third air-cutting and water-blowing unit 23, a fourth image acquisition device 314 acquires a fourth image of the optical glass surface (the fourth image acquisition device 314 is configured the same as the first image acquisition device 311, using a line scan camera with a high-brightness transmitted light source). The image processing unit 32 registers the fourth image with the first image to generate a third registered image pair, and extracts the third distribution of residual dirt on the optical glass surface based on the third registered image pair.

[0047] The control unit 33 generates adjustment commands based on the third dirt residue distribution and sends them to the clean water spray cleaning unit 14 and the overflow pure water cleaning unit 15, respectively. When the third dirt residue distribution indicates detergent residue, the control unit 33 adjusts the clean water spray cleaning unit 14 to increase the spray pressure or flow rate; when it indicates ion residue or water stains, it adjusts the overflow pure water cleaning unit 15 to increase the overflow rate or increase the pure water supply. This feedback adjustment ensures that the final rinsing process can effectively remove any chemical substances that may remain from the previous process.

[0048] S5. After the above three-stage cleaning and corresponding drying processes, the surface of the optical glass reaches the preset cleanliness requirements and is conveyed to the equipment outlet by a roller conveyor, outputting clean and dry optical glass that directly meets the strict requirements of subsequent precision processing steps such as coating and bonding for the cleanliness of the glass surface.

[0049] In the aforementioned cleaning process, this invention extracts the distribution of residual dirt by comparing and registering images before and after cleaning. It only needs to determine the degree of difference between images, without the need for complex classification and separate modeling of dirt types (such as oil film, particles, water stains, etc.). This design significantly reduces the development difficulty, training cost, and maintenance workload of visual detection algorithms, while improving the versatility and robustness of the detection system, enabling it to adapt to cleaning scenarios with different types of dirt.

[0050] It can also dynamically adjust the process parameters of each cleaning unit 1 according to actual cleaning needs. When the incoming material is lightly soiled or the current cleaning unit is efficient enough, parameters such as ultrasonic power, detergent flow rate, and spray pressure can be automatically reduced to avoid ineffective consumption of energy and cleaning consumables. Compared with the traditional equipment that always operates at a preset maximum power, this application can achieve on-demand cleaning, effectively reducing the energy consumption and consumable cost per unit product.

[0051] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An optical glass cleaning device, characterized in that, The system includes a vision inspection system, multiple cleaning units arranged sequentially along the optical glass transport direction, and drying units corresponding to some of the cleaning units. The vision inspection system includes multiple image acquisition devices, each of which is located downstream of its corresponding drying unit. Each image acquisition device is controlled and connected to the cleaning unit located upstream of it, and is used to adjust the process parameters of its upstream cleaning unit based on the acquired image information.

2. The optical glass cleaning equipment according to claim 1, characterized in that, The visual inspection system also includes an image processing unit and a control unit. The image acquisition device is arranged downstream of the cleaning unit to acquire image information of the optical glass surface. The image processing unit is communicatively connected to the image acquisition device and is used to register the acquired image information and extract the distribution of dirt residue on the optical glass surface. The control unit is communicatively connected to the image processing unit and each cleaning unit respectively and is used to generate adjustment instructions according to the distribution of dirt residue and send them to the corresponding cleaning unit to adjust its process parameters.

3. The optical glass cleaning equipment according to claim 2, characterized in that, The image processing unit includes a registration module and an extraction module. The registration module is used to register the image information collected at different work stations with the reference image information collected before the optical glass is cleaned, and generate a registered image pair. The extraction module is communicatively connected to the registration module and is used to extract the distribution of dirt residue on the surface of the optical glass based on the registered image pair.

4. The optical glass cleaning equipment according to claim 2, characterized in that, The control unit includes a distribution analysis module and an instruction generation module. The distribution analysis module is communicatively connected to the image processing unit and is used to generate a dirt residue heat map based on the dirt residue distribution. The instruction generation module is communicatively connected to the distribution analysis module and is used to generate adjustment instructions for each cleaning unit based on the dirt residue heat map, and send the adjustment instructions to the corresponding cleaning unit.

5. The optical glass cleaning equipment according to claim 1, characterized in that, Multiple cleaning units are sequentially arranged along the optical glass transmission direction, including an ultrasonic cleaning unit, a chemical detergent spray cleaning unit, a brush cleaning unit, a clean water spray cleaning unit, and an overflow pure water cleaning unit. The chemical detergent spray cleaning unit is used to spray detergent onto the optical glass for cleaning. The brush cleaning unit is used to brush the surface of the optical glass. The clean water spray cleaning unit is used to rinse away residual detergent and dirt. The overflow pure water cleaning unit is used to rinse the optical glass with overflow pure water. The drying unit includes a first air-cutting water blowing unit, a second air-cutting water blowing unit, and a third air-cutting water blowing unit. The first air-cutting water blowing unit is located downstream of the ultrasonic cleaning unit, the second air-cutting water blowing unit is located downstream of the brush cleaning unit, and the third air-cutting water blowing unit is located downstream of the overflow pure water cleaning unit.

6. The optical glass cleaning equipment according to claim 4, characterized in that, The ultrasonic cleaning unit has a frame and rubber rollers, an ultrasonic generator, a water tank, and several vibrating heads mounted on the frame. The vibrating heads are arranged in the water tank. The ultrasonic generator is electrically connected to the vibrating heads to control the vibrating heads to generate ultrasonic waves. There are two sets of rubber rollers arranged at the frame inlet and frame outlet respectively.

7. A method for cleaning optical glass, characterized in that, Using the optical glass cleaning apparatus according to any one of claims 1-6, comprising: S1. Send the glass into the inlet and capture the first image before cleaning; S2. Perform a first cleaning process and a first drying process on the glass in sequence. After the first drying process, acquire a second image, pair the first image and the second image, and adjust the parameters of the first cleaning process according to the pairing result. S3. Perform a second cleaning process and a second drying process on the optical glass in sequence. After the second drying process, acquire a third image, pair the first image and the third image, and adjust the parameters of the second cleaning process according to the pairing result. S4. Perform the third cleaning process and the third drying process on the glass in sequence. After the third drying process, acquire the fourth image, pair the fourth image with the first image, and adjust the parameters of the third cleaning process according to the pairing result. S5, Output clean optical glass after cleaning.

8. The optical glass cleaning method according to claim 7, characterized in that, The pairing of the first image and the second image / third image / fourth image specifically involves registering the second image / third image / fourth image with the first image to generate a first registered image pair / second registered image pair / third registered image pair. Based on the first registered image pair / second registered image pair / third registered image pair, the first dirt residue distribution / second dirt residue distribution / third dirt residue distribution on the optical glass surface are extracted as the pairing result.

9. The optical glass cleaning method according to claim 7, characterized in that, The first cleaning process specifically involves conveying the optical glass into a water tank, using an ultrasonic generator to drive a vibrating head to generate ultrasonic waves, and the ultrasonic waves creating a cavitation effect in the cleaning solution in the water tank to act on the surface of the optical glass, thereby initially removing dirt from the surface of the optical glass; the second cleaning process specifically involves first spraying cleaning agent onto the surface of the optical glass, and then using a rotating brush to scrub the dirt on the surface of the optical glass; the third cleaning process specifically involves first rinsing with clean water to remove residual cleaning agent and dirt, and then rinsing the optical glass with overflow pure water.

10. The optical glass cleaning method according to claim 7, characterized in that, The first drying process is the same as the second and third drying processes. Specifically, the first drying process involves using a wind-cutting device to blow away water stains from the surface of the optical glass.

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