A coffee raw material cleaning and grading screening device

Abstract

This invention provides a coffee raw material cleaning, grading, and screening device, belonging to the technical field of coffee raw material grading equipment. The grading and screening device specifically includes a cleaning component, a conveying component, a screening component, and a conveyor belt component connected in sequence. The cleaning component is used to clean the coffee beans after peeling. The conveying component is used to lift and transport the cleaned coffee beans to the screening component. The screening component is used to grade and screen the cleaned coffee beans according to fruit size, and simultaneously remove residual moisture from the surface of the coffee beans after cleaning. The conveyor belt component is used to transport the graded and screened coffee beans to the corresponding storage area for grading and storage. The coffee raw material cleaning, grading, and screening device proposed in this invention can solve the problems of traditional cleaning and sorting devices where the cleaning, grading, and drying processes are separated during the initial processing, impurity separation is incomplete, and the equipment lacks integrated continuous operation capability.

Description

Technical Field

[0001] This invention belongs to the field of coffee raw material grading technology, and specifically relates to a coffee raw material cleaning, grading and screening device. Background Technology

[0002] Coffee raw material grading is a core factor determining coffee quality and price, directly impacting the industry's upgrade path from "bulk raw materials" to "premium products." Currently, China has become a major global coffee consumption and processing center—the industrial cluster represented by Kunshan accounts for nearly 60% of the country's imported green coffee bean value.

[0003] Regarding cleaning equipment, some existing technologies already employ cleaning devices with inner and outer barrel structures. For example, a cleaning device for food processing disclosed in CN113695306B also uses a technical solution where the inner barrel is rotatably connected to the inside of the outer barrel, and an agitator is rotatably connected inside the inner barrel. However, its core design focuses on using the liquid flow between the inner barrel and the agitator to improve cleaning efficiency, lacking a systematic consideration for the targeted separation and treatment of impurities of different properties.

[0004] In terms of grading and screening, there are existing multi-stage perforated thin plate screening devices, such as a coffee bean grading and screening device provided by CN211887794U, which achieves top-down particle size grading and screening through several containers stacked from top to bottom; a screening device provided by CN219943511U also relates to the field of coffee bean screening technology.

[0005] Based on the analysis of the aforementioned patents and existing technologies, the following issues were identified: In existing technologies, the various functional devices are separated from each other, and coffee beans need to be transferred multiple times between the washing machine, grading machine, and drying equipment, resulting in a long processing cycle, large equipment footprint, and a lot of manual intervention.

[0006] Existing cleaning equipment typically uses a single drain hole design, which cannot effectively separate light impurities suspended on the water surface from heavy impurities or turbid water that sink to the bottom. This results in the two types of impurities being mixed together, and coffee beans may also become entangled with the light impurities, affecting the subsequent grading results.

[0007] Existing equipment typically uses the inner and outer drums to rotate relative to each other during cleaning. When the inner drum contains a solid-liquid mixture, it generates a large radial and axial load on the central rotating shaft, making the rotation cleaning process highly dangerous.

[0008] After washing, coffee beans carry a large number of water droplets on their surface. If these are not thoroughly removed, it will affect the grading and sorting process and promote mold growth during subsequent storage. Current technology typically involves grading first and then drying separately, resulting in separate processes and low efficiency. Summary of the Invention

[0009] In view of this, the present invention proposes a coffee raw material cleaning, grading and screening device, which can solve the problems of traditional cleaning and sorting devices where the cleaning, grading and drying processes are separated during the initial processing, impurities are not completely separated and the equipment lacks integrated continuous operation capability.

[0010] The present invention is implemented as follows: The present invention proposes a coffee raw material cleaning, grading and screening device, the device comprising a cleaning component, a conveying component, a screening component and a conveyor belt component connected in sequence; The cleaning component is used to clean the coffee bean raw material after peeling, removing surface dust and impurities such as fruit peels, twigs, and leaves. The conveying component is used to receive the cleaning component and the sorting component, and to lift and transport the cleaned coffee beans to the sorting component; The screening component is used to grade and screen the cleaned coffee bean raw materials according to fruit size, and simultaneously remove the moisture remaining on the surface of the coffee beans due to washing. The conveyor belt assembly is used to transport the coffee beans after grading and sorting to the corresponding storage area for grading and storage.

[0011] Based on the above technical solution, the coffee raw material cleaning, grading and screening device of the present invention can be further improved as follows: Furthermore, the cleaning assembly includes an outer cleaning tank and an inner cleaning tank with a double-layer design. The inner cleaning tank is rotatably installed inside the outer cleaning tank, and a cleaning brush for cleaning coffee cherries after picking and peeling is also rotatably installed inside the inner cleaning tank. A first drive motor for driving the cleaning brush to rotate and a second drive motor for driving the inner cleaning tub to rotate are fixedly installed on the outer wall of the outer cleaning tub. A drive gear is fixedly installed on the output end of the second drive motor, and a driven gear is fixedly installed at the end of the inner cleaning tub. The drive gear and the driven gear mesh and are assembled to transmit the power of the second drive motor to the inner cleaning tub.

[0012] Furthermore, according to the coffee raw material cleaning, grading and screening device according to the claim, the outer cleaning tank is characterized in that a cleaning inlet is provided at the top, a cleaning outlet and a second water outlet are provided at the bottom, and a first water outlet is provided on the side wall away from the conveying component. The height of the first water outlet is less than half the height of the outer washing tank and higher than the lowest point of the inner washing tank. Its opening width is 10-20cm, which is used to discharge fruit peels, leaves and immature or spoiled coffee beans floating on the surface of the washing water. There are multiple second water outlets arranged linearly along the length of the outer cleaning tank. Their opening width is less than 3mm, and they are used to discharge turbid cleaning water after large-volume impurities are discharged.

[0013] The beneficial effect of adopting the above-mentioned further technical solution is that by limiting the height of the first water outlet and the width of the second water outlet, it is ensured that light impurities such as leaves and fruit peels floating on the upper layer can flow out from the first water outlet, and coffee beans will not flow out of the cleaning component along with the discharged wastewater.

[0014] Furthermore, the inner cleaning tub has an inlet and outlet on its side wall, and extension sleeves are provided at both ends. The extension sleeves pass through the side wall of the outer cleaning tub and are fitted and fixedly installed with bearings between them. Below the inner cleaning tub, there are also a number of inner cleaning tub support pillars. One end of each inner cleaning tub support pillar is fixedly installed on the bottom surface of the outer cleaning tub, and the other end abuts against the outer wall of the inner cleaning tub.

[0015] The beneficial effect of adopting the above-mentioned further technical solution is that by setting up an inner cleaning tank support column, the inner cleaning tank can be supported, thus preventing the main shaft from bending or breaking.

[0016] Furthermore, the conveying assembly includes a storage tank for storing washed coffee beans and a screw feeder for conveying coffee beans to the screening assembly. The storage tank is located directly below the cleaning outlet and includes a tank body and a filter plate fixedly installed inside the tank body. The filter plate forms a 15° angle with the bottom of the tank body. The bottom surface of the storage tank is fixedly equipped with a protrusion for connecting the screw feeder, and a water outlet is opened at the bottom.

[0017] Furthermore, the spiral feeder is installed at an angle and includes an outer feeder housing, an inner spiral rod, and a third drive motor at the top. The screw rod is rotatably installed inside the feeder housing, and the third drive motor is fixedly installed on the top of the feeder housing, with its output end fixedly connected to the screw rod; The bottom inlet of the feeder housing is close to the upper surface of the filter plate, and the top outlet is connected to the screening assembly via a pipe. One end of the spiral rod passes through the filter plate and is rotatably mounted on the protrusion via a bearing, while the other end passes through the top of the feeder housing and is fixedly connected to the output shaft of the third drive motor.

[0018] Furthermore, the screening assembly includes a screening tower, multiple sorting plates fixedly installed inside the screening tower, and a hot air blower; The sorting plates include a first sorting plate, a second sorting plate, a third sorting plate, a fourth sorting plate, and a fifth sorting plate, which are fixed from top to bottom. All sorting plates are at an angle of 20-30° to the horizontal plane, and the aperture of the perforated thin plate of the sorting plates decreases from large to small. The top of the screening tower is provided with a screening inlet, and multiple screening outlets are provided on the side wall away from the conveying components. Each screening outlet corresponds to a sorting plate. The hot air blower is fixedly installed between the fifth sorting plate and the screening tower, and is used to blow high-temperature flowing gas into the screening tower to remove residual washing water from the surface of the coffee beans.

[0019] Furthermore, the conveyor belt assembly includes a conveyor belt frame and multiple conveyor belts, with baffles provided on both sides of each conveyor belt, and the baffles being fixedly installed on the conveyor belt frame. Each conveyor belt corresponds to the screening outlet of the screening tower and is used to distribute the coffee beans that have passed screening to different channels.

[0020] The beneficial effect of adopting the above-mentioned further technical solution is that by setting baffles, coffee beans are prevented from falling outside the conveyor belt when they roll out of the sorting tower.

[0021] Furthermore, a hanging lug is welded and installed at each of the four corners of the top of the outer cleaning tank, which is used to lift the cleaning component on one side using an overhead crane to assist in material discharge; The outer cleaning tank is also provided with a cleaning water outlet on its side wall. The cleaning water outlet is located on the side wall away from the first outlet and close to the bottom of the outer cleaning tank, and is used to add cleaning water to the outer cleaning tank for secondary cleaning. The brush is made of a soft material; A sleeve is also provided between the cleaning inlet and the outlet. The sleeve is fixedly installed at the cleaning inlet to prevent coffee beans from entering the outer cleaning tank directly without being cleaned by the roller brush when adding coffee beans.

[0022] The beneficial effect of adopting the above-mentioned further technical solution is that by setting up the hanging ear, the outer washing tank can be tilted when discharging or draining, so as to facilitate the discharge of wastewater or clean coffee beans.

[0023] Furthermore, a base support is fixedly installed at the bottom of the screening tower, and the bottom surface of the base support is flush with the bottom surface of the storage tank. The hot air blower continuously blows hot air into the sorting tower. As the coffee beans fall under their own weight, pass through each sorting plate, and are intercepted and rolled onto the conveyor belt assembly, the residual washing water on the surface is removed simultaneously.

[0024] Compared with existing technologies, the beneficial effects of the coffee raw material cleaning, grading and screening device provided by the present invention are: 1. Achieve integrated and continuous operation of processes: By connecting four modules in sequence—cleaning, handling, screening, and conveying—a one-stop production line is formed from raw material cleaning to graded storage, which greatly shortens the processing cycle, reduces equipment footprint and manual transportation costs, and significantly improves production efficiency.

[0025] 2. Improve the thoroughness of impurity separation and cleaning quality: Utilize a graded drainage structure: the first outlet discharges light impurities, and the second outlet discharges turbid water, achieving a step-by-step separation of light impurities such as fruit peels, leaves, and immature coffee beans from the cleaning water. This avoids secondary pollution caused by mixed discharge of impurities and ensures the cleanliness of the coffee beans.

[0026] 3. Achieve simultaneous grading and surface dehydration: Inclined sorting plates with decreasing apertures are arranged from top to bottom inside the sorting tower, and a hot air blower is installed at the bottom. This allows coffee beans to be sorted by their own weight while being blown by hot air, completing particle size screening and surface moisture removal in one go. This simplifies the process, reduces energy consumption, and prevents residual moisture from affecting subsequent storage and grading accuracy.

[0027] 4. Optimize the initial drainage at the front end of the conveying process: Install a filter plate at a 15° angle in the storage tank so that water droplets on the surface of the washed coffee beans can automatically drip off and be discharged during temporary storage, reducing the amount of moisture carried into the subsequent conveying and screening components, reducing the drying load on the hot air blower, and preventing moisture from spreading and affecting the equipment operating environment.

[0028] 5. Enhance the structural reliability of equipment operation: By adding an inner cleaning tank support column below the inner cleaning tank, the inner tank that carries the solid-liquid mixture is directly supported, which effectively reduces the load on the main shaft, prevents it from bending or breaking, extends the service life of the equipment, and ensures the stability of long-term continuous operation. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure; Figure 2 This is a schematic diagram of the cleaning component structure; Figure 3 This is a cross-sectional view of the cleaning component structure; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 Left view of the cleaning component; Figure 6 Right view of the cleaning component; Figure 7 Top view of the cleaning components; Figure 8 This is a cross-sectional view of the transport component; Figure 9 To filter component profiles.

[0030] 1. Cleaning assembly; 11. Outer cleaning tank; 111. Cleaning inlet; 112. Cleaning outlet; 113. First water outlet; 114. Second water outlet; 115. Cleaning water outlet; 116. Hanging lug; 12. Inner cleaning tank; 121. Inlet / outlet; 122. Extension sleeve; 123. Inner cleaning tank support column; 13. Cleaning brush; 131. Main shaft; 132. Brush connecting rod; 133. Brush; 14. First drive motor; 15. Second drive motor; 16. Drive gear; 17. Driven gear; 18. Cleaning tank bracket; 2. Handling components; 21. Storage tank; 211. Tank body; 212. Filter plate; 22. Screw feeder; 221. Feeder housing; 222. Screw rod; 223. Feeder bracket; 224. Third drive motor; 3. Screening components; 31. Screening tower; 311. Screening inlet; 312. Screening outlet; 313. Base support; 32. First sorting plate; 33. Second sorting plate; 34. Third sorting plate; 35. Fourth sorting plate; 36. Fifth sorting plate; 37. Hot air blower; 4. Conveyor belt assembly; 41. Conveyor belt frame; 42. Conveyor belt; 43. Baffle. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] As shown in the figure, this invention proposes a coffee raw material cleaning, grading and screening device. This device integrates multiple processes such as cleaning, handling and screening of coffee beans after harvesting, and is used to quickly grade and screen coffee raw materials. It can also facilitate subsequent targeted grading of coffee raw materials.

[0033] This device specifically includes a cleaning assembly 1, a conveying assembly 2, a screening assembly 3, and a conveyor belt assembly 4 connected in sequence.

[0034] The washing assembly 1 cleans the peeled coffee beans, removing surface dust and unwanted impurities such as peels, twigs, and leaves. The transport assembly 2 receives the coffee beans from the washing assembly 1 and the sorting assembly 3, lifting and transporting them to the sorting assembly 3. The sorting assembly 3 grades the cleaned coffee beans according to size and simultaneously removes any residual moisture from the surface. The conveyor belt assembly 4 transports the graded and sorted coffee beans to the corresponding storage area for further grading and storage.

[0035] Specifically, the cleaning assembly 1 includes an outer cleaning tank 11 and an inner cleaning tank 12 with a double-layer design. The inner cleaning tank 12 is rotatably installed inside the outer cleaning tank 11. A cleaning brush 13 for cleaning coffee cherries after picking and peeling is also rotatably installed inside the inner cleaning tank 12.

[0036] A first drive motor 14 for driving the cleaning brush 13 to rotate and a second drive motor 15 for driving the inner cleaning tub 12 to rotate are fixedly installed on the outer wall of the outer cleaning tub 11. A drive gear 16 is fixedly installed on the output end of the second drive motor 15 and a driven gear 17 is fixedly installed at the end of the inner cleaning tub 12. Both the drive gear 16 and the driven gear 17 are located outside the outer cleaning tub 11. The drive gear 16 and the driven gear 17 are meshed and assembled to transmit the power of the second drive motor 15 to the inner cleaning tub 12.

[0037] The cleaning assembly 1 also includes a cleaning tank support 18, which is composed of four upright square columns and an X-shaped plate in the middle of the square columns. The outer cleaning tank 11 is placed and installed on the X-shaped plate in the middle of the cleaning tank support 18.

[0038] The outer washing tank 11 has a washing inlet 111 at the top, a washing outlet 112 and a second water outlet 114 at the bottom, and a first water outlet 113 on the side wall away from the conveying assembly 2. The washing inlet 111 is used to add peeled coffee beans and washing water to the inner washing tank 12, the washing outlet 112 is used to discharge the washed coffee beans, and the washing water is discharged through the first water outlet 113 and the second water outlet 114 respectively.

[0039] The height of the first outlet 113 is less than half the height of the outer cleaning tank 11 and higher than the lowest point of the inner cleaning tank 12. The opening width of the first outlet 113 is sufficient to allow the passage of large impurities such as leaves and branches. In this embodiment, the opening width of the first outlet 113 is between 10-20 cm.

[0040] The second water outlet 114 is located on the side away from the conveying component 2, and the washing outlet 112 is located on the side closer to the conveying component 2. There are multiple second water outlets 114, arranged linearly in the opposite direction along the length of the outer washing tank 11, and their opening width is less than the thickness of the smallest coffee bean. In this embodiment, the opening width of the second water outlet 114 is less than 3 mm.

[0041] Since the raw coffee beans after peeling contain coffee peels, leaves, branches and other large impurities, after washing, the first outlet 113 is opened first to drain the peels, leaves and other impurities floating on the surface of the washing water, as well as immature and spoiled coffee beans. Then the second outlet 114 is opened to completely drain the turbid washing water.

[0042] An inlet / outlet 121 is provided on the side wall of the inner cleaning tank 12, and extension sleeves 122 are provided at both ends. The extension sleeves 122 pass through the side wall of the outer cleaning tank 11, and a bearing is fixedly installed between the extension sleeves 122 and the outer cleaning tank 11. The driven gear 17 is fixedly installed on the extension sleeve 122 on the side away from the conveying component 2.

[0043] Below the inner cleaning tank 12, there are also a number of inner cleaning tank support columns 123. One end of the inner cleaning tank support column 123 is fixedly installed on the inner bottom surface of the outer cleaning tank 11, and the other end abuts against the outer wall of the inner cleaning tank 12. This is used to support the inner cleaning tank 12 and prevent the pressure on the main shaft 131 from being too great during the coffee fruit cleaning operation, which could cause the main shaft 131 to bend or even break.

[0044] The cleaning brush 13 includes a main shaft 131 that runs through the outer cleaning tank 11 and the inner cleaning tank 12, and multiple brushes 133 for brushing coffee beans. The multiple brushes 133 are fixedly mounted on the outer wall of the main shaft 131 in a circumferential array via brush connecting rods 132. All brushes 133 are located inside the inner cleaning tank 12.

[0045] The conveying assembly 2 includes a storage tank 21 for storing cleaned coffee beans and a screw feeder 22 for conveying coffee beans to the screening assembly 3. The screw feeder 22 is installed at an angle, with its bottom inlet connected to the storage tank 21 and its top outlet connected to the screening assembly 3.

[0046] The material storage tank 21 is located directly below the cleaning outlet 112. The material storage tank 21 includes a tank body 211 and a filter plate 212 fixedly installed inside the tank body 211. The filter plate 212 forms a 15° angle with the bottom of the tank body 211. A protrusion for connecting the screw feeder 22 is fixedly installed on the bottom surface of the material storage tank 211, and a water outlet is opened at the bottom.

[0047] The screw feeder 22 includes an outer feeder housing 221, an inner screw rod 222, and a third drive motor 224 at the top. The screw rod 222 is rotatably mounted inside the feeder housing 221, and the third drive motor 224 is fixedly mounted on the top of the feeder housing 221, with its output end fixedly connected to the screw rod 222. The bottom inlet of the feeder housing 221 is close to the upper surface of the filter plate 212, and the top outlet is connected to the screening assembly 3 via a pipe.

[0048] One end of the spiral rod 222 passes through the filter plate 212 and is rotatably mounted on the protrusion via a bearing. The other end passes through the top of the feeder housing 221 and is fixedly connected to the output shaft of the third drive motor 224. A feeder bracket 223 is also fixedly installed below the feeder housing 221, and the bottom of the feeder bracket 223 is flush with the bottom of the tank 211.

[0049] The screw rod 222 in the screw feeder 22 is perpendicular to the filter plate 212, and the screw rod 222 is coaxial with the feeder housing 221.

[0050] The screening assembly 3 includes a screening tower 31, multiple sorting plates fixedly installed inside the screening tower 31, and a hot air blower 36. In this embodiment, there are five sorting plates, all of which are at an angle of 20-30° to the horizontal plane. Each sorting plate is actually composed of an outer fixed plate and a perforated thin plate in the middle. The perforated thin plate is arranged from largest to smallest in diameter as follows: first sorting plate 32, second sorting plate 33, third sorting plate 34, fourth sorting plate 35, and fifth sorting plate 36. The above five sorting plates are fixed sequentially from top to bottom along the height direction of the screening tower 31.

[0051] Specifically, the 36 holes in the fifth sorting plate are smaller than the thickness of the smallest coffee bean. In this embodiment, the hole diameters of the perforated thin plates in the middle of each sorting plate are as follows: First sorting plate 32: 20mm; Second sorting plate 33: 15mm; Third sorting plate 34: 12mm; Fourth sorting plate 35: 10mm; Fifth sorting plate 36: 5-8mm.

[0052] The top of the screening tower 31 is provided with a screening inlet 311 for feeding materials, and multiple screening outlets 312 are provided on the side wall away from the conveying component 2. Each screening outlet 312 corresponds to a sorting plate.

[0053] The hot air blower 37 is fixedly installed between the fifth sorting plate 36 and the screening tower 31, and is used to blow high-temperature flowing gas into the screening tower 31.

[0054] The bottom of the screening tower 31 is also fixedly installed with a base support 313, the bottom of which is flush with the bottom surface of the storage tank 21.

[0055] The conveyor belt assembly 41 includes a conveyor belt frame 41 and multiple conveyor belts 42. Each conveyor belt 42 has baffles 43 on both sides, and the baffles 43 are fixedly installed on the conveyor belt frame 41. Each conveyor belt 42 corresponds to the screening outlet 312 of the screening tower 31, and distributes the coffee beans that have passed through screening to different channels.

[0056] Optionally, a hanging lug 116 is welded and installed at each of the four corners of the top of the outer cleaning tank 11, so that the cleaning component 1 can be lifted on one side by the overhead crane in the factory, so that the cleaning water or coffee beans inside the outer cleaning tank 11 can be completely discharged.

[0057] Optionally, a cleaning water inlet 115 is also provided on the side wall of the outer cleaning tank 11. The cleaning water inlet 115 is used to add cleaning water to the outer cleaning tank 11 for secondary cleaning of the coffee beans. The cleaning water inlet 115 is located on the side wall away from the first water outlet 113, near the bottom of the outer cleaning tank 11.

[0058] Optionally, the brush 133 is made of a soft material to avoid damaging the coffee beans during the rolling process.

[0059] Optionally, a sleeve is provided between the cleaning inlet 111 of the outer cleaning tank 11 and the inlet / outlet 121 of the inner cleaning tank 12. The sleeve is fixedly installed at the cleaning inlet 111 of the outer cleaning tank 11 to prevent coffee beans from entering the outer cleaning tank 11 directly without being cleaned by the roller brush when adding coffee beans to the inner cleaning tank 12.

[0060] Based on the above mechanical structure, the specific working principle of the present invention is as follows: In the initial stage of the equipment, the second drive motor 15 controls the inner cleaning tank 12 to rotate, so that the inlet and outlet 121 on the wall of the inner cleaning tank 12 is coaxial with the cleaning inlet 111 on the top of the outer cleaning tank 11, and the position of the inner cleaning tank 12 is fixed by the motor self-locking mechanism.

[0061] The staff delivers the peeled coffee beans to the cleaning unit 1, and sends them along with the cleaning water to the inner cleaning tank 12. At this time, the first drive motor 14 starts, driving the cleaning brush 13 to clean the coffee beans in the inner cleaning tank 12, separating the coffee fruit skins adhering to the surface of the coffee beans and impurities such as leaves mixed in with the coffee beans.

[0062] After a set time, the cleaning process ends. The second drive motor 15 controls the inner cleaning tank 12 to rotate, pouring the turbid cleaning water and the preliminarily cleaned coffee beans into the outer cleaning tank 11. After the pouring time is over, the second drive motor 15 controls the inner cleaning tank 12 to rotate back to its original position and lock it. At this time, cleaning water and unwashed coffee beans are added to the inner cleaning tank 12 again for the next cleaning cycle.

[0063] After washing, light impurities such as spoiled coffee beans, leaves, and fruit peels will float on the surface of the washing water. Open the first outlet 113 to discharge the surface washing water and large impurities.

[0064] The process continues until the level of the turbid cleaning water drops below the first outlet 113. Then, the first outlet 113 is closed, and clean cleaning water or filtered turbid cleaning water is introduced into the outer cleaning tank 11 through the cleaning water outlet 115 to flush the solid-liquid mixture inside the outer cleaning tank 11. The impact force of the water flow sends a small amount of solid impurities mixed in the coffee berries to the surface of the cleaning water. The first outlet 113 is then reopened to discharge the surface solid-liquid mixture.

[0065] Repeat two to three times until other solid impurities mixed in with the coffee beans are removed. At this point, open the second water outlet 114 to drain all the turbid cleaning water and simultaneously rinse with clean cleaning water.

[0066] After cleaning, open the cleaning outlet 112 and use the overhead crane in the factory to lift the coffee beans away from the cleaning outlet 112 and pour the cleaned coffee beans into the storage tank 21.

[0067] Coffee beans are temporarily stored in storage tank 21 and then successively fed to screening tower 31 by screw feeder 22. During the temporary storage of coffee beans in storage tank 21, water droplets carried on the surface of the coffee beans will fall through filter plate 212 to the bottom of storage tank 21 and eventually be discharged outside the system.

[0068] After the coffee beans are conveyed to the sorting tower 31 by the screw feeder 22, they fall under the influence of gravity, pass through the sorting plates, are intercepted at the corresponding sorting plates, and then roll down to the conveyor belt assembly 4 through the sorting outlet 312. During this process, the hot air blower 36 at the bottom of the sorting tower 31 continuously blows hot air into the sorting tower 31 to remove residual washing water from the surface of the coffee beans.

[0069] The conveyor belt 42 in the conveyor belt assembly 4 sequentially feeds the sorted coffee beans into the coffee bean storage area of ​​the corresponding size and type, completing the cleaning, analysis and screening of the coffee beans.

[0070] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A coffee raw material cleaning, grading, and screening device, characterized in that, It includes a cleaning assembly (1), a handling assembly (2), a screening assembly (3), and a conveyor belt assembly (4) connected in sequence. The cleaning component (1) is used to clean the coffee bean raw material after peeling to remove surface dust and impurities such as fruit peel, branches and leaves. The transport component (2) is used to receive the cleaning component (1) and the screening component (3) and to lift and transport the cleaned coffee beans to the screening component (3). The screening component (3) is used to grade and screen the cleaned coffee bean raw materials according to fruit size, and simultaneously remove the moisture remaining on the surface of the coffee beans due to washing. The conveyor belt assembly (4) is used to transport the coffee beans after grading and screening to the corresponding storage area for grading and storage.

2. The coffee raw material cleaning, grading, and screening device according to claim 1, characterized in that, The cleaning assembly (1) includes an outer cleaning tank (11) and an inner cleaning tank (12) with a double-layer design. The inner cleaning tank (12) is rotatably installed inside the outer cleaning tank (11). A cleaning brush (13) for cleaning coffee cherries after picking and peeling is also rotatably installed inside the inner cleaning tank (12). The outer wall of the outer cleaning tub (11) is fixedly equipped with a first drive motor (14) for driving the cleaning brush (13) to rotate and a second drive motor (15) for driving the inner cleaning tub (12) to rotate. A drive gear (16) is fixedly installed on the output end of the second drive motor (15), and a driven gear (17) is fixedly installed at the end of the inner cleaning tub (12). The drive gear (16) and the driven gear (17) mesh and are assembled to transmit the power of the second drive motor (15) to the inner cleaning tub (12).

3. The coffee raw material cleaning, grading, and screening device according to claim 2, characterized in that, The outer cleaning tank (11) has a cleaning inlet (111) at the top, a cleaning outlet (112) and a second water outlet (114) at the bottom, and a first water outlet (113) on the side wall away from the conveying component (2). The height of the first water outlet (113) is less than half the height of the outer washing tank (11) and higher than the lowest point of the inner washing tank (12). Its opening width is 10-20cm, which is used to discharge fruit peels, leaves and immature or spoiled coffee beans floating on the surface of the washing water. There are multiple second water outlets (114), which are arranged linearly along the length of the outer cleaning tank (11). Their opening width is less than 3mm, and they are used to discharge turbid cleaning water after large volume impurities are discharged.

4. The coffee raw material cleaning, grading and screening device according to claim 2, characterized in that, The inner cleaning tub (12) has an inlet and outlet (121) on its side wall, and extension sleeves (122) are provided at both ends. The extension sleeves (122) pass through the side wall of the outer cleaning tub (11) and are fitted and fixedly installed with bearings between them. Below the inner cleaning tub (12), there are also a number of inner cleaning tub support pillars (123). One end of the inner cleaning tub support pillar (123) is fixedly installed on the inner bottom surface of the outer cleaning tub (11), and the other end abuts against the outer wall of the inner cleaning tub (12) to support the inner cleaning tub (12) and prevent the main shaft (131) from bending or breaking.

5. The coffee raw material cleaning, grading and screening device according to claim 1, characterized in that, The conveying assembly (2) includes a storage tank (21) for storing cleaned coffee beans and a screw feeder (22) for conveying coffee beans to the screening assembly (3). The storage tank (21) is located directly below the cleaning outlet (112), and includes a tank body (211) and a filter plate (212) fixedly installed inside the tank body (211). The filter plate (212) forms a 15° angle with the bottom of the tank body (211). The bottom surface of the storage tank (211) is fixedly equipped with a protrusion for connecting the screw feeder (22), and a water outlet is provided at the bottom.

6. The coffee raw material cleaning, grading, and screening device according to claim 5, characterized in that, The spiral feeder (22) is installed at an angle and includes an outer feeder housing (221), an inner spiral rod (222), and a third drive motor (224) at the top. The screw rod (222) is rotatably installed inside the feeder housing (221), and the third drive motor (224) is fixedly installed on the top of the feeder housing (221), with its output end fixedly connected to the screw rod (222). The bottom inlet of the feeder housing (221) is close to the upper surface of the filter plate (212), and the top outlet is connected to the screening assembly (3) through a pipe; One end of the spiral rod (222) passes through the filter plate (212) and is rotatably mounted on the protrusion via a bearing, while the other end passes through the top of the feeder housing (221) and is fixedly connected to the output shaft of the third drive motor (224).

7. The coffee raw material cleaning, grading and screening device according to claim 1, characterized in that, The screening component (3) includes a screening tower (31), multiple sorting plates fixedly installed inside the screening tower (31), and a hot air blower (36). The sorting plates include a first sorting plate (32), a second sorting plate (33), a third sorting plate (34), a fourth sorting plate (35), and a fifth sorting plate (36) fixed from top to bottom. All sorting plates are at an angle of 20-30° to the horizontal plane, and the diameter of the perforated thin plate of the sorting plates decreases from large to small. The top of the screening tower (31) is provided with a screening inlet (311), and a number of screening outlets (312) are provided on the side wall away from the conveying component (2). Each screening outlet (312) corresponds to a sorting plate. The hot air blower (36) is fixedly installed between the fifth sorting plate (36) and the screening tower (31) to blow high-temperature flowing gas into the screening tower (31) to remove residual washing water from the surface of the coffee beans.

8. The coffee raw material cleaning, grading and screening device according to claim 1, characterized in that, The conveyor belt assembly (4) includes a conveyor belt frame (41) and multiple conveyor belts (42). Each conveyor belt (42) has baffles (43) on both sides, and the baffles (43) are fixedly installed on the conveyor belt frame (41). Each conveyor belt (42) corresponds to the screening outlet (312) of the screening tower (31) and is used to distribute the coffee beans that have been screened out.

9. A coffee raw material cleaning, grading, and screening device according to claim 2, characterized in that, The outer cleaning tank (11) has a hanging ear (116) welded and installed at each of the four corners of the top, which is used to lift the cleaning component (1) on one side by using a crane to assist in material discharge; The outer cleaning tank (11) is also provided with a cleaning water outlet (115) on its side wall. The cleaning water outlet (115) is located on the side wall away from the first outlet (113) and close to the bottom of the outer cleaning tank (11), and is used to add cleaning water to the outer cleaning tank (11) for secondary cleaning. The brush (133) is made of a soft material; A sleeve is also provided between the cleaning inlet (111) and the outlet (121). The sleeve is fixedly installed at the cleaning inlet (111) to prevent coffee beans from entering the outer cleaning tank (11) directly without being cleaned by the roller brush when adding coffee beans.

10. A coffee raw material cleaning, grading, and screening device according to claim 7, characterized in that, The bottom of the screening tower (31) is also fixedly installed with a base support (313), and the bottom surface of the base support (313) is flush with the bottom surface of the storage tank (21). The hot air blower (36) continuously blows hot air into the screening tower (31). As the coffee beans fall by their own weight, pass through each sorting plate, and are intercepted and rolled onto the conveyor belt assembly (4), the residual cleaning water on the surface is removed simultaneously.

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