Coffee quality screening device and method

Abstract

The coffee quality screening device comprises a shell, an image acquisition module and a light source system are arranged in the shell, a sorting cavity is formed in the shell, the upper end of the sorting cavity inclines backwards, working grooves are formed in the front side and the rear side of the sorting cavity, and transparent protection windows are arranged at the joints between the working grooves and the sorting cavity. The image acquisition module and the light source system are both arranged in the working groove, and a cleaning assembly used for cleaning the protective window is arranged in the working groove; the transparent protective window can separate the sorting cavity from the image acquisition module and the light source system, and dust is prevented from affecting work of the image acquisition module and the light source system. And the protection window is cleaned at regular time through the cleaning assembly, so that stable work of the image acquisition module and the light source system is ensured.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a coffee quality screening device and method. Background Technology

[0002] As a widely consumed beverage globally, the quality of coffee beans, the raw material for coffee, directly impacts the flavor and market value of the final product. To ensure consistent coffee bean quality, automated sorting equipment is commonly used in industrial production for grading and screening. Among these methods, color sorting technology based on machine vision has become one of the mainstream quality inspection techniques due to its advantages such as high efficiency, non-contact processing, and quantifiability.

[0003] Existing coffee bean color sorting devices typically include a feeding system, a high-speed camera or image acquisition module, a light source system, a pneumatic rejection mechanism, and a control system. During operation, coffee beans are evenly dispersed by a vibrating feeder and fall freely. Passing through a detection area illuminated by a high-brightness LED light source, a high-speed camera captures in real-time the color, shape, and surface defects of each bean. The control system analyzes the images according to preset quality standards and drives a solenoid valve to blow away defective beans, thus achieving automatic sorting.

[0004] However, in practical applications, dust (such as residual pectin fragments, dried fruit shell particles, and environmental dust) is inevitably generated during the conveying, tumbling, and falling of coffee beans. These fine particles easily become suspended in the air and adhere to key optical components of color sorting equipment, such as camera lenses, protective glass windows, and light source lenses. Once these optical surfaces are covered with dust, image quality deteriorates. Dust obstructs or attenuates incident light, causing the acquired image to appear blurry, uneven in brightness, and with reduced contrast. Ultimately, this impairs recognition accuracy. Visual algorithms rely on clear and stable image input, and dust interference can easily lead to misjudgments, such as mistakenly rejecting qualified beans or missing defective beans. Summary of the Invention

[0005] The purpose of this invention is to provide a coffee quality screening device and method, which isolates the sorting chamber from the image acquisition module and the light source system through a protective window, and then cleans the protective window regularly using a cleaning component to ensure the stability of the image acquisition module and the light source system.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A coffee quality screening device includes a housing, an image acquisition module and a light source system inside the housing, a sorting cavity inside the housing, the upper end of the sorting cavity being inclined backward, working slots on both the front and rear sides of the sorting cavity, and transparent protective windows at the connection between the working slots and the sorting cavity. The image acquisition module and the light source system are both located inside the working slots, and a cleaning component for cleaning the protective windows is provided inside the working slots. The cleaning assembly includes a first telescopic motor, a second telescopic motor, a storage slot, a support cover, a scraper, and a nozzle. Two storage slots are located above two protective windows. Two first telescopic motors are located on the left and right sides of the sorting chamber. Four second telescopic motors are located in pairs on the first telescopic motors. The pressing direction of the two second telescopic motors in the same group faces the two protective windows. The second telescopic motors are connected to the support cover, which is open on the side closest to the protective windows. The scraper and nozzle are both located inside the support cover, with one end of the scraper protruding from the support cover. The support cover can be moved to the opening of the storage slot via the second telescopic motor, and the scraper can be located inside the storage slot. The front end of the housing is equipped with a control panel, and the image acquisition module, the light source system, the first telescopic motor, and the second telescopic motor are all electrically connected to the control panel.

[0007] By adopting the above technical solution, the transparent protective window can separate the sorting chamber from the image acquisition module and the light source system, preventing dust from affecting the operation of the image acquisition module and the light source system. The protective window is then cleaned periodically by a cleaning component to ensure the stable operation of the image acquisition module and the light source system. The cleaning component uses a first telescopic motor to move the support cover and scraper, and then a second telescopic motor to press it down, causing the scraper to adhere to the protective window. The nozzle then discharges cleaning fluid, scraping away the dust on the protective window.

[0008] A further configuration of the present invention is as follows: the scraper is inclined downward on the protective window, and multiple nozzles are provided and evenly arranged inside the support cover, with the nozzles facing the joint between the scraper and the protective window.

[0009] By adopting the above technical solution, the nozzle sprays cleaning fluid onto the protective window in front of the scraper.

[0010] A further configuration of the present invention is as follows: the sorting cavity has an isolation groove at the lower end of the protective window, the isolation groove has drainage grooves on the left and right sides of the support cover, the lower end of the drainage groove is connected to the isolation groove, the bottom of the lower isolation groove is connected to a waste liquid tank, the bottom of the upper support cover is connected to a drain pipe, and the other end of the drain pipe is connected to the lower support cover.

[0011] By adopting the above technical solution, the isolation tank can prevent the cleaning liquid from flowing downwards, and the drainage tank and drainage pipe can collect the waste liquid and finally discharge it into the waste liquid bucket.

[0012] A further feature of the present invention is that it also includes a slide rail, which is disposed at the upper end of the storage groove and protrudes from the storage groove.

[0013] By adopting the above technical solution, the design of the slide can make the coffee beans slide evenly and prevent them from falling onto the support cover.

[0014] A further configuration of the present invention is as follows: a pneumatic rejection mechanism is provided at the rear end of the sorting cavity, the pneumatic rejection mechanism is located at the lower end of the protective window, a discharge port and a waste port that cooperate with the pneumatic rejection mechanism are provided inside the housing, a transition groove is connected in the middle of the discharge port, the other end of the transition groove is connected to a discharge box, a partition is rotatably connected at the connection between the discharge port and the transition groove, a cylinder is rotatably connected to the partition, the other end of the cylinder is rotatably connected to the housing, the cylinder drives the partition to rotate at the discharge port and the transition groove, and both the pneumatic rejection mechanism and the cylinder are electrically connected to the control panel.

[0015] By adopting the above technical solution, the pneumatic rejection mechanism blows inferior coffee beans into the waste inlet, while the cylinder pushes the baffle to change the opening and closing of the discharge port and the transition groove, which facilitates the completion of multiple identification requirements.

[0016] A further configuration of the present invention is as follows: the feeding box is located at the rear end of the housing, the rear end of the feeding box is provided with a feeding hopper, a conveyor is provided inside the housing, a conveyor belt is provided inside the housing, the conveyor belt is arranged front-to-back, the outlet of the conveyor belt extends to the upper end of the slide, the lower end of the conveyor extends into the feeding box, the other end of the conveyor extends onto the conveyor belt, a dust suction hood is provided at the upper end of the conveyor belt, a filter is connected to the upper end of the dust suction hood, an air pump is connected to the filter, and the conveyor, the conveyor belt and the air pump are all electrically connected to the control panel.

[0017] By adopting the above technical solution, the feeder transfers coffee beans to the conveyor belt, and the dust on the coffee beans is sucked away by the dust hood and air pump.

[0018] A further configuration of the present invention is as follows: the right end of the working groove extends out of the housing, a first support frame is slidably connected in the working groove, the image acquisition module and the light source system are evenly installed on the first support frame, the housing is provided with a mounting groove with an opening at the right end at the pneumatic rejection mechanism, a second support frame is slidably connected in the mounting groove, and the pneumatic rejection mechanism is evenly installed on the second support frame.

[0019] By adopting the above technical solution, the first support frame and the second support frame facilitate the adjustment, maintenance and replacement of the image acquisition module, the light source system and the pneumatic rejection mechanism.

[0020] This invention also provides a method for screening coffee quality, comprising the following steps: S1: System Initialization and Self-Cleaning S1.1 Equipment Start-up: Start the system via the control panel. The image acquisition module, light source system, and conveyor mechanism will perform self-tests. S1.2 Automatic Cleaning of Protective Window: The control panel controls the operation of the first telescopic motor to move the support cover to the working position; the second telescopic motor pushes the support cover so that its scraper is in close contact with the protective window; the nozzle sprays cleaning liquid or atomized water, and at the same time the scraper moves downward along the surface of the protective window under the drive of the first telescopic motor to scrape off the stains; after cleaning is completed, the second telescopic motor and the first telescopic motor move the support cover into the storage tank, and the waste liquid generated during the cleaning process flows into the waste liquid tank through the drainage tank and the isolation tank.

[0021] S2, Coffee bean feeding and pretreatment S2.1 Feeding: Pour the coffee beans to be screened into the feed hopper and into the discharge box; S2.2 Quantitative conveying: The conveyor evenly conveys coffee beans from the feeding hopper onto the conveyor belt; S2.3 Dust Removal: During the operation of the conveyor belt, the dust suction hood above sucks away the dust and debris on the surface of the coffee beans under the action of the air pump, and collects them through the filter to ensure that image acquisition is not interfered with; S3, Visual Inspection and Image Analysis S3.1 Formation of detection area: The conveyor belt feeds coffee beans into the slide in the sorting chamber, and the backward tilting design allows the coffee beans to spread out naturally; S3.2 Uniform Illumination: The light source system in the working slots on both sides is activated to provide a uniform and shadowless lighting environment for the sorting chamber; S3.3 Dual-sided image acquisition: Two image acquisition modules simultaneously capture images of the front and back of the coffee bean through transparent protective windows on both sides; S3.4 Real-time Analysis: Image data is transmitted to the processing system in the control panel in real time. The system judges each coffee bean according to preset algorithms and standards, marking it as "qualified" or "unqualified".

[0022] S4, Pneumatic Precision Sorting S4.1 Positioning and Rejection: When a coffee bean marked as "unqualified" moves to the front of the pneumatic rejection mechanism, the control system triggers the nozzle at the corresponding position to spray a short, high-pressure airflow, accurately blowing it into the waste inlet. S4.2 Qualified Product Collection: Qualified coffee beans that have not been rejected continue to move forward and fall naturally from the discharge port; S5. Separate collection of finished products and waste materials. S5.1 Mode Selection: Finished product collection mode: The control cylinder closes the transition trough with the baffle, and qualified beans fall directly from the discharge port into the finished product collection container; Multiple identification mode: During the previous or first few screenings, the partition is rotated by the cylinder, allowing the coffee beans to pass through the transition trough into the feeding box. When the pneumatic rejection mechanism stops working, the discharge port can be opened to collect qualified products. S5.2 Waste disposal: Defective beans that are pneumatically removed fall into a special waste collection box through the waste inlet; S6. Maintenance and Adjustment S6.1 Modular maintenance: When it is necessary to clean or repair the image acquisition, light source or pneumatic rejection module, the first support frame and the second support frame can be slid out from the working slot and the mounting slot respectively, which is convenient for operation and does not affect the main structure. S6.2 Parameter settings: The light source intensity, camera parameters, sorting sensitivity, cleaning frequency, etc. can be flexibly adjusted through the control panel to adapt to the sorting needs of different varieties and grades of coffee beans; S6.3, Cyclic Cleaning: The cleaning component can be set to automatically perform a cleaning of the protective window once at regular intervals or in quantitative amounts to ensure continuous and stable detection results.

[0023] In summary, the present invention has the following beneficial effects: Firstly, the transparent protective window in this invention separates the sorting cavity from the image acquisition module and the light source system, preventing dust from affecting their operation. Furthermore, the protective window is cleaned periodically by a cleaning component, ensuring the stable operation of the image acquisition module and the light source system.

[0024] Secondly, the cleaning component in this invention uses a first telescopic motor to move the support cover, scraper and nozzle to clean the protective window, while the second telescopic motor can adjust the position of the scraper so that the scraper can move into the storage slot when not in use, thus avoiding the scraper pressing on the protective window for a long time and affecting the cleaning effect.

[0025] Thirdly, in this invention, the upper support cover can catch the waste liquid scraped off by the scraper during use, and then discharge it into the lower support cover through the drain pipe and into the lower isolation tank through the drain trough. The lower scraper directly scrapes the waste liquid into the drain trough and the lower isolation tank, and finally flows into the waste liquid bucket, which is convenient for collecting waste liquid.

[0026] Fourth, the first and second support frames in this invention facilitate the adjustment, maintenance, and replacement of the image acquisition module, the light source system, and the pneumatic rejection mechanism. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is the present invention. Figure 2 Enlarged view of point A in the middle; Figure 4 This is the present invention. Figure 2 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the structure of the isolation trough and drainage trough in this invention.

[0028] In the diagram: 1. Shell; 11. Sorting chamber; 12. Working trough; 13. Protective window; 14. Isolation trough; 15. Drainage trough; 16. Waste liquid tank; 17. Discharge port; 18. Waste port; 19. Transition trough; 110. Partition plate; 111. Cylinder; 112. Conveyor; 113. Conveyor belt; 114. Dust hood; 115. Air pump; 116. Filter; 117. Mounting slot; 2. Image acquisition module; 3. Light source system; 4. Cleaning components; 41. First telescopic motor; 42. Second telescopic motor; 43. Storage trough; 44. Support cover; 45. Scraper; 46. Nozzle; 47. Drain pipe; 5. Control panel; 6. Slide rail; 7. Pneumatic rejection mechanism; 8. Discharge box; 81. Feed hopper; 91. First support frame; 92. Second support frame. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0031] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Example: A coffee quality screening device, such as Figures 1 to 5 As shown, the system includes a housing 1, which houses an image acquisition module 2 and a light source system 3. Other modules or systems may also be required, but these are existing technologies and will not be described in detail; selection is based on need. A sorting cavity 11 is located within the housing 1, with its upper end tilted backward. Working slots 12 are located on both the front and rear sides of the sorting cavity 11. Transparent protective windows 13 are provided at the connection points between the working slots 12 and the sorting cavity 11. The image acquisition module 2 and the light source system 3 are both located within the working slots 12. A cleaning component 4 for cleaning the protective windows 13 is also located within the working slots 12. The cleaning component 4 includes a first telescopic motor 41, a second telescopic motor 42, a storage slot 43, a support cover 44, a scraper 45, and a nozzle 46. Two storage slots 43 are located at the upper ends of the two protective windows 13. Two first telescopic motors 41 are located on the left and right sides of the sorting chamber 11. Four second telescopic motors 42 are arranged in pairs on the first telescopic motors 41. The pressing direction of the two second telescopic motors 42 in the same group faces the two protective windows 13. The second telescopic motors 42 are connected to the support cover 44, which is open on the side closest to the protective window 13. The scraper 45 and nozzle 46 are both located inside the support cover 44. One end of the scraper 45 protrudes from the support cover 44. The scraper 45 is made of silicone for easy scraping of the protective window 13. The support cover 44 can be moved to the opening of the storage slot 43 via the second telescopic motor 42, and the scraper 45 can be located inside the storage slot 43. The scraper 45 is inclined downwards on the protective window 13. Multiple nozzles 46 are evenly distributed within the support cover 44, facing the contact point between the scraper 45 and the protective window 13. The sorting chamber 11 has an isolation groove 14 at the lower end of the protective window 13. Drainage grooves 15 are formed on the left and right sides of the support cover 44, with the lower end of the drainage groove 15 connected to the isolation groove 14. A waste liquid tank 16 is connected to the bottom of the lower isolation groove 14, and a drain pipe 47 is connected to the bottom of the upper support cover 44. The other end of the drain pipe 47 is connected to the lower support cover 44. The device also includes a slide 6, which is located at the upper end of the receiving groove 43 and protrudes from it.

[0034] During use, coffee beans slide down the slide 6 and are image-recognized by the image acquisition module 2 and the light source system 3. When dust on the protective window 13 affects recognition, the first telescopic motor 41 drives the support cover 44, scraper 45 and nozzle 46 to move. The nozzle 46 sprays clean water or cleaning solution, and the scraper 45 scrapes away the dust to clean the protective window 13. The second telescopic motor 42 can adjust the position of the scraper 45, allowing the scraper 45 to move into the storage slot 43 when not in use, to avoid the scraper 45 pressing on the protective window 13 for a long time and affecting the cleaning effect. Of course, the pressing pressure of the scraper 45 can also be adjusted. During the scraping process, the upper support cover 44 can catch the waste liquid scraped off by the scraper 45, and then drain it through the drain pipe 47 into the lower support cover 44 and through the drain trough 15 into the lower isolation trough 14. The lower scraper 45 directly scrapes the waste liquid into the drain trough 15 and the lower isolation trough 14, and finally into the waste liquid bucket 16 for easy collection of waste liquid.

[0035] For ease of control, a control panel 5 is provided at the front end of the housing 1. The image acquisition module 2, the light source system 3, the first telescopic motor 41, and the second telescopic motor 42 are all electrically connected to the control panel 5.

[0036] A pneumatic rejection mechanism 7 is provided at the rear end of the sorting chamber 11. The pneumatic rejection mechanism 7 is located at the lower end of the protective window 13. The housing 1 is provided with a discharge port 17 and a waste port 18 that cooperate with the pneumatic rejection mechanism 7. A transition groove 19 is connected in the middle of the discharge port 17. The other end of the transition groove 19 is connected to the discharge box 8. A partition 110 is rotatably connected at the connection between the discharge port 17 and the transition groove 19. A cylinder 111 is rotatably connected on the partition 110. The other end of the cylinder 111 is rotatably connected to the housing 1. The cylinder 111 drives the partition 110 to rotate between the discharge port 17 and the transition groove 19. The pneumatic rejection mechanism 7 and the cylinder 111 are both electrically connected to the control panel 5. When the partition 110 closes the discharge port 17 and opens the transition trough 19, the coffee beans being tested will re-enter the feed box 8 and be tested again. In order to ensure the quality of testing, the coffee beans can undergo multiple rounds of testing. Of course, different screening requirements can also be set as needed to ensure that high-quality coffee beans are selected.

[0037] The discharge box 8 is located at the rear end of the housing 1. The rear end of the discharge box 8 is provided with a feed hopper 81. The housing 1 is provided with a conveyor 112 and a conveyor belt 113. The conveyor belt 113 is arranged in a front-to-back orientation. The outlet of the conveyor belt 113 extends to the upper end of the slide 6. The lower end of the conveyor 112 extends into the discharge box 8. The other end of the conveyor 112 extends onto the conveyor belt 113. The upper end of the conveyor belt 113 is provided with a dust suction hood 114. The upper end of the dust suction hood 114 is connected to a filter 116. The filter 116 is connected to an air pump 115. The conveyor 112, the conveyor belt 113 and the air pump 115 are all electrically connected to the control panel 5. The coffee beans in the feed bin 8 can be sucked onto the conveyor belt 113 by the conveyor belt 113 and then transported to the slide 6 by the conveyor belt 113. During the conveying process of the conveyor belt 113, the dust and other light impurities on the coffee beans are absorbed by the dust suction hood 114 and the air pump 115 to prevent them from entering the sorting chamber 11.

[0038] The right end of the working slot 12 extends out of the housing 1. A first support frame 91 is slidably connected inside the working slot 12. The image acquisition module 2 and the light source system 3 are evenly mounted on the first support frame 91. The housing 1 has a mounting slot 117 with an opening at the right end at the pneumatic rejection mechanism 7. A second support frame 92 is slidably connected inside the mounting slot 117. The pneumatic rejection mechanism 7 is evenly mounted on the second support frame 92. The first support frame 91 and the second support frame 92 can be pulled out to facilitate adjustment, maintenance, and replacement of the image acquisition module 2, the light source system 3, and the pneumatic rejection mechanism 7.

[0039] A method for screening coffee quality includes the following steps: S1: System Initialization and Self-Cleaning S1.1 Equipment Startup: Start the system via control panel 5, and perform self-tests on image acquisition module 2, light source system 3, and conveyor mechanism; S1.2 Automatic Cleaning Protective Window 13: Control panel 5 controls the operation of the first telescopic motor 41 to move the support cover 44 to the working position; the second telescopic motor 42 pushes the support cover 44 so that its scraper 45 is in close contact with the protective window 13; the nozzle 46 sprays cleaning liquid or atomized water, and at the same time the scraper 45 moves downward along the surface of the protective window 13 under the drive of the first telescopic motor 41 to scrape off the stains; after cleaning, the second telescopic motor 42 and the first telescopic motor 41 move the support cover 44 into the storage tank 43, and the waste liquid generated during the cleaning process flows into the waste liquid tank 16 through the drain tank 15 and the isolation tank 14.

[0040] S2, Coffee bean feeding and pretreatment S2.1 Feeding: Pour the coffee beans to be screened into the feed hopper 81 and into the discharge box 8; S2.2 Quantitative conveying: The feeder 112 evenly conveys coffee beans from the feeding box 8 onto the conveyor belt 113; S2.3 Dust Removal: During the operation of the conveyor belt 113, the dust suction hood 114 above sucks away the dust and debris on the surface of the coffee beans under the action of the air pump 115, and collects them through the filter 116 to ensure that image acquisition is not interfered with. S3, Visual Inspection and Image Analysis S3.1 Formation of detection area: The conveyor belt 113 feeds coffee beans into the slide 6 inside the sorting chamber 11. The backward tilting design allows the coffee beans to spread out naturally. S3.2 Uniform illumination: The light source system 3 in the working slots on both sides 12 is activated to provide a uniform and shadowless lighting environment for the sorting cavity 11; S3.3, Dual-sided image acquisition: Two image acquisition modules 2 simultaneously capture images of the front and back of the coffee beans through the transparent protective windows 13 on both sides; S3.4 Real-time Analysis: Image data is transmitted in real time to the processing system within control panel 5. The system judges each coffee bean according to preset algorithms and standards, marking it as "qualified" or "unqualified".

[0041] S4, Pneumatic Precision Sorting S4.1 Positioning and Rejection: When a coffee bean marked as "unqualified" moves to the front of the pneumatic rejection mechanism 7, the control system triggers the nozzle 46 at the corresponding position to spray a short, high-pressure airflow, accurately blowing it into the waste inlet 18. S4.2 Qualified Product Collection: Qualified coffee beans that have not been rejected continue to move forward and fall naturally from discharge port 17; S5. Separate collection of finished products and waste materials. S5.1 Mode Selection: Finished product collection mode: Control cylinder 111 causes baffle 110 to close transition groove 19, and qualified beans fall directly from discharge port 17 into finished product collection container; Multiple identification mode: During the previous or previous screening, the partition 110 is rotated by the cylinder 111, so that the coffee beans enter the feeding box 8 through the transition groove 19. When the pneumatic rejection mechanism 7 stops working, the discharge port 17 can be opened to collect qualified products. S5.2 Waste disposal: Defective beans that are pneumatically removed fall into a special waste collection box through waste inlet 18; S6. Maintenance and Adjustment S6.1 Modular maintenance: When it is necessary to clean or repair the image acquisition, light source or pneumatic rejection module, the first support frame 91 and the second support frame 92 can be slid out from the working slot 12 and the mounting slot 117 respectively, which is convenient for operation and does not affect the main structure. S6.2 Parameter settings: The light source intensity, camera parameters, sorting sensitivity, cleaning frequency, etc. can be flexibly adjusted through the control panel 5 to adapt to the sorting needs of different varieties and grades of coffee beans; S6.3, Cyclic Cleaning: The cleaning component 4 can be set to automatically perform a cleaning of the protective window 13 once at regular intervals or in quantitative amounts to ensure continuous and stable detection results.

[0042] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A coffee quality screening device, comprising a housing (1), wherein an image acquisition module (2) and a light source system (3) are provided inside the housing (1), characterized in that: The housing (1) is provided with a sorting cavity (11), the upper end of the sorting cavity (11) is tilted backward, and the front and rear sides of the sorting cavity (11) are provided with working grooves (12). The connection between the working grooves (12) and the sorting cavity (11) is provided with transparent protective windows (13). The image acquisition module (2) and the light source system (3) are both located in the working grooves (12). The working grooves (12) are provided with cleaning components (4) for cleaning the protective windows (13). The cleaning assembly (4) includes a first telescopic motor (41), a second telescopic motor (42), a storage slot (43), a support cover (44), a scraper (45), and a nozzle (46). Two storage slots (43) are provided, each located above one of the two protective windows (13). Two first telescopic motors (41) are provided, each located on the left and right sides of the sorting cavity (11). Four second telescopic motors (42) are provided, arranged in pairs on the first telescopic motors (41). Two second telescopic motors (42) in the same group... The pressing direction is towards the two protective windows (13) respectively. The second telescopic motor (42) is connected to the support cover (44). The side of the support cover (44) near the protective window (13) is open. The scraper (45) and the nozzle (46) are both located inside the support cover (44). One end of the scraper (45) protrudes from the support cover (44). The support cover (44) can be moved to the opening of the storage slot (43) by the second telescopic motor (42). The scraper (45) can be located inside the storage slot (43). The front end of the housing (1) is provided with a control panel (5), and the image acquisition module (2), the light source system (3), the first telescopic motor (41), and the second telescopic motor (42) are all electrically connected to the control panel (5).

2. The coffee quality screening device according to claim 1, characterized in that: The scraper (45) is tilted downward on the protective window (13), and multiple nozzles (46) are provided and evenly arranged inside the support cover (44). The nozzles (46) face the joint between the scraper (45) and the protective window (13).

3. The coffee quality screening device according to claim 1, characterized in that: The sorting chamber (11) has an isolation groove (14) at the lower end of the protective window (13). The isolation groove (14) has drainage grooves (15) on the left and right sides of the support cover (44). The lower end of the drainage groove (15) is connected to the isolation groove (14). The bottom of the lower isolation groove (14) is connected to a waste liquid tank (16). The bottom of the upper support cover (44) is connected to a drain pipe (47). The other end of the drain pipe (47) is connected to the lower support cover (44).

4. The coffee quality screening device according to claim 3, characterized in that: It also includes a slide (6), which is located at the upper end of the storage groove (43) and protrudes from the storage groove (43).

5. The coffee quality screening device according to claim 4, characterized in that: The rear end of the sorting chamber (11) is provided with a pneumatic rejection mechanism (7). The pneumatic rejection mechanism (7) is located at the lower end of the protective window (13). The housing (1) is provided with a discharge port (17) and a waste port (18) that cooperate with the pneumatic rejection mechanism (7). The middle part of the discharge port (17) is connected to a transition groove (19). The other end of the transition groove (19) is connected to a discharge box (8). A partition plate (110) is rotatably connected at the connection between the discharge port (17) and the transition groove (19). A cylinder (111) is rotatably connected on the partition plate (110). The other end of the cylinder (111) is rotatably connected to the housing (1). The cylinder (111) drives the partition plate (110) to rotate at the discharge port (17) and the transition groove (19). The pneumatic rejection mechanism (7) and the cylinder (111) are both electrically connected to the control panel (5).

6. The coffee quality screening device according to claim 5, characterized in that: The feeding box (8) is located at the rear end of the housing (1). The rear end of the feeding box (8) is provided with a feeding hopper (81). The housing (1) is provided with a conveyor (112) and a conveyor belt (113). The conveyor belt (113) is arranged in a front-to-back orientation. The outlet of the conveyor belt (113) extends to the upper end of the slide (6). The lower end of the conveyor (112) extends into the feeding box (8). The other end of the conveyor (112) extends onto the conveyor belt (113). The upper end of the conveyor belt (113) is provided with a dust suction hood (114). The upper end of the dust suction hood (114) is connected to a filter (116). The filter (116) is connected to an air pump (115). The conveyor (112), the conveyor belt (113), and the air pump (115) are all electrically connected to the control panel (5).

7. The coffee quality screening device according to claim 6, characterized in that: The right end of the working slot (12) extends out of the housing (1). A first support frame (91) is slidably connected inside the working slot (12). The image acquisition module (2) and the light source system (3) are evenly installed on the first support frame (91). The housing (1) has a mounting slot (117) with an opening at the right end at the pneumatic rejection mechanism (7). A second support frame (92) is slidably connected inside the mounting slot (117). The pneumatic rejection mechanism (7) is evenly installed on the second support frame (92).

8. The coffee quality screening method according to claim 7, characterized in that, Includes the following steps: S1: System Initialization and Self-Cleaning S1.1 Equipment Start-up: Start the system via the control panel (5), and perform self-tests on the image acquisition module (2), the light source system (3), and the conveying mechanism; S1.2 Automatic Cleaning of Protective Window (13): The control panel (5) controls the operation of the first telescopic motor (41) to move the support cover (44) to the working position; the second telescopic motor (42) pushes the support cover (44) so ​​that its scraper (45) is close to the protective window (13); the nozzle (46) sprays out cleaning liquid or atomized water, and at the same time the scraper (45) moves downward along the surface of the protective window (13) under the drive of the first telescopic motor (41) to scrape off the stains; after cleaning, the second telescopic motor (42) and the first telescopic motor (41) move the support cover (44) into the storage tank (43), and the waste liquid generated during the cleaning process flows into the waste liquid tank (16) through the drain tank (15) and the isolation tank (14). S2, Coffee bean feeding and pretreatment S2.1 Feeding: Pour the coffee beans to be screened into the feed hopper (81) and into the discharge box (8); S2.2, Quantitative conveying: The feeder (112) evenly conveys coffee beans from the feeding box (8) onto the conveyor belt (113); S2.3 Dust Removal: During the operation of the conveyor belt (113), the dust suction hood (114) above sucks away the dust and debris on the surface of the coffee beans under the action of the air pump (115), and collects them through the filter (116) to ensure that the image acquisition is not interfered with. S3, Visual Inspection and Image Analysis S3.1 Formation of detection area: The conveyor belt (113) feeds coffee beans into the slide (6) in the sorting chamber (11), and the backward tilting design allows the coffee beans to spread out naturally; S3.2 Uniform illumination: The light source system (3) in the working slots (12) on both sides is activated to provide a uniform and shadowless lighting environment for the sorting cavity (11); S3.3, Dual-sided image acquisition: Two image acquisition modules (2) simultaneously capture images of the front and back of the coffee beans through the transparent protective windows (13) on both sides; S3.4 Real-time analysis: Image data is transmitted to the processing system in the control panel (5) in real time. The system judges each coffee bean according to the preset algorithm and standard and marks it as "qualified" or "unqualified". S4, Pneumatic Precision Sorting S4.1 Positioning and rejection: When a coffee bean marked as "unqualified" moves to the front of the pneumatic rejection mechanism (7), the control system triggers the nozzle (46) at the corresponding position to spray a short, high-pressure airflow to accurately blow it into the waste inlet (18). S4.2, Collection of qualified products: Qualified coffee beans that have not been rejected continue to move forward and fall naturally from the discharge port (17); S5. Separate collection of finished products and waste materials. S5.1 Mode Selection: Finished product collection mode: The control cylinder (111) causes the partition (110) to close the transition groove (19), and qualified beans fall directly from the discharge port (17) into the finished product collection container; Multiple identification mode: During the previous or previous screening, the partition (110) is rotated by the cylinder (111) so that the coffee beans enter the feeding box (8) through the transition groove (19). When the pneumatic rejection mechanism (7) stops working, the discharge port (17) can be opened to collect qualified products. S5.2 Waste disposal: Defective beans that are pneumatically removed fall into a special waste collection box through the waste inlet (18); S6. Maintenance and Adjustment S6.1 Modular maintenance: When it is necessary to clean or repair the image acquisition, light source or pneumatic rejection module, the first support frame (91) and the second support frame (92) can be slid out from the working slot (12) and the mounting slot (117) respectively, which is convenient for operation and does not affect the main structure; S6.2 Parameter settings: The light source intensity, camera parameters, sorting sensitivity, cleaning frequency, etc. can be flexibly adjusted through the control panel (5) to adapt to the screening needs of different varieties and grades of coffee beans; S6.3, Cyclic Cleaning: The cleaning component (4) can be set to automatically perform a cleaning of the protective window (13) once at a time or in a quantitative manner to ensure that the detection effect is continuously stable.

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