Conveying device with multi-layer screening function for coffee bean processing

Abstract

The invention discloses a conveying device with a multi-layer screening function for coffee bean processing, and relates to the technical field of conveying devices.The conveying device comprises a first conveying table top, a second conveying table top and a third conveying table top, an auxiliary assembly is arranged on the surface of the first conveying table top, and the second conveying table top is located at the bottom end of the first conveying table top; a detection assembly is arranged on the surface of the second transportation table top, the third transportation table top is located at the bottom end of the second transportation table top, the first transportation table top comprises two side plates and a bottom frame, the bottom frame is located between the two side plates, the auxiliary assembly comprises a spring, an extrusion column and a piezoelectric block, a groove is formed in the bottom frame, and the piezoelectric block is located at the bottom end in the groove. An extrusion column is arranged at the top end of the piezoelectric block and slidably connected with the inner wall of the groove, and the extrusion column is sleeved with the spring.

Description

Technical Field

[0001] This invention relates to the field of conveying device technology, specifically a conveying device for coffee bean processing with multi-layer screening function. Background Technology

[0002] In the coffee bean processing industry, conveyor systems are core equipment connecting raw material storage and subsequent processing stages. They must simultaneously transport and initially screen coffee beans to remove impurities such as stones, bean husks, and waste beans (moldy beans, broken beans, etc.), ensuring the quality of raw materials for subsequent roasting, grinding, and other processes. However, traditional coffee bean processing conveyor systems suffer from the following key technical challenges in practical applications, making it difficult to meet the demands for efficient and precise processing.

[0003] In summary, traditional coffee bean processing conveying devices typically feed coffee beans into the device in batches. Due to the stacking characteristics of the raw material particles, the single conveying surface of traditional devices is prone to local accumulation problems, and repeated screening causes excessive friction damage. Furthermore, the top layer of coffee beans has difficulty contacting the screening components, and the screening rate decreases significantly as the amount of raw material accumulates. The screening function of traditional conveying devices mostly relies on a single-size filter screen, which can only separate qualified beans from mixed impurities based on the size of the coffee bean particles. It cannot further distinguish between recyclable small coffee beans and unusable waste products in the mixed impurities. Summary of the Invention

[0004] The purpose of this invention is to provide a conveying device for coffee bean processing with multi-layer screening function, so as to solve the problems mentioned in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The conveying device includes a first conveying platform, a second conveying platform and a third conveying platform. The surface of the first conveying platform is provided with auxiliary components. The second conveying platform is located at the bottom of the first conveying platform. The surface of the second conveying platform is provided with detection components. The third conveying platform is located at the bottom of the second conveying platform. The first conveying platform includes side plates and a bottom frame. There are two side plates and the bottom frame is located between the two side plates. The auxiliary components include a spring, an extrusion column, and a piezoelectric block. A groove is provided in the bottom frame, the piezoelectric block is located at the bottom of the groove, and an extrusion column is provided at the top of the piezoelectric block. The extrusion column is slidably connected to the inner wall of the groove, and the spring is sleeved on the extrusion column.

[0006] Furthermore, during coffee bean processing, large quantities of raw coffee beans need to be transported via conveyor systems. However, during transport, the quality of the raw coffee beans deteriorates due to the presence of stones, bean husks, and waste beans. Therefore, sorting of the raw coffee beans is necessary during transport. Because of the large quantity of raw coffee beans, they easily accumulate during transport, affecting both transport and filtration efficiency. This accumulation also means that only the bottom layer of beans is sorted, while the top layer beans have a lower probability of being sorted. The more raw coffee beans there are, the lower the sorting rate of the top layer beans. Even after sorting, the remaining beans contain bad beans and small beans. Bad beans are unusable, while small beans have other uses, so they also need to be extracted. The first transport platform serves as the main transport aisle for the first screening process, removing the main coffee beans. The second transport platform is used for the second screening process, removing small coffee beans, pebbles, and waste beans. The third transport platform is used for the third screening process, removing even smaller materials such as bean shells. The auxiliary components control the turntable rotation speed based on the amount of coffee bean material accumulated. The detection components detect the type of beans moving on the second transport platform. Its two side plates and the bottom frame form a trough, and the auxiliary components are located inside the bottom frame. As the extrusion column moves, it squeezes the top of the piezoelectric block. The voltage of the piezoelectric block changes when it is compressed. The longer the extrusion column moves, the greater the voltage of the piezoelectric block, and vice versa. The spring provides elastic potential energy.

[0007] The auxiliary components also include turntables and connecting columns. The turntables are located inside the bottom frame, and there are several turntables. The turntables are rotatably connected to the inner wall of the bottom frame. The turntables are arranged in two rows at equal intervals. The turntables are equipped with connecting columns, and the two ends of the connecting columns are fixedly connected to the turntables. The outer wall of the side plate is equipped with a drive component.

[0008] Furthermore, the turntable and connecting column are used to stir the coffee bean raw materials piled up in the bottom frame, thereby improving the screening efficiency. The drive component is used to control the rotation of the turntable, which drives the connecting column to rotate, and the rotation of the connecting column breaks up the piled coffee bean raw materials.

[0009] The first transport platform also includes a first filter screen plate. The top of the bottom frame is fixedly connected to the bottom of the side plate. Several first filter screen plates are provided at the bottom of the inner wall of the bottom frame. The first filter screen plates are arranged at equal intervals. The first filter screen plates are slidably connected to the inner wall of the groove. The extrusion column is located at the bottom of the first filter screen plate.

[0010] The device features a first filter plate located within the bottom frame. Coffee bean raw materials first accumulate on the first filter plate, and then defective products fall through the first filter plate onto the second transport platform. The extrusion column in the first transport platform is located at the bottom end of the first filter plate, and both ends of the first filter are slidably connected to the bottom frame. The top end of the extrusion column is fixedly connected to the bottom end of the first filter plate. A spring fitted on the extrusion column provides an elastic range. When transporting coffee bean raw materials, the raw materials accumulate on the first filter plate at the corresponding position, causing the first filter plate to move downwards. The movement of the first filter plate drives the extrusion column to move, and the movement of the extrusion column extrudes the piezoelectric block.

[0011] The detection assembly includes a parallel electrode and a flow guide plate. The surface of the flow guide plate has several discharge ports, the parallel electrode is located inside the discharge ports, and the top of the flow guide plate is provided with a top cover.

[0012] Furthermore, the detection component is located at the output end of the second transport platform. The diversion plate is used to collect and divert the beans in the second transport platform, thereby forming multiple outlets. The outlets are used to allow individual beans to pass through. Several parallel electrodes are provided and arranged in the outlets. Each outlet has two parallel electrodes. When the beans are discharged through the outlets, they pass through the parallel electrodes, and a capacitance value is generated between the parallel electrodes. When the beans pass between the parallel electrodes, if the beans are normal small coffee beans, the capacitance value is constant. If the beans are moldy beans or stones, the capacitance value increases due to the moisture and mold. If the beans are broken beans, the capacitance value decreases. The top cover and the diversion plate are combined to form a sealed space to prevent the beans from splashing.

[0013] An air outlet pipe is provided on the side of the diversion plate away from the first filter plate.

[0014] Furthermore, one end of the air outlet pipe is connected to an external pipe, and the other end of the air outlet pipe is located at the bottom of the discharge port of the guide plate. The number of the output ends of the air outlet pipe is the same as the number of discharge ports of the guide plate. The air outlet pipe is used to discharge high-pressure gas to screen out the waste beans when the parallel electrode detects waste beans.

[0015] The drive assembly includes a rotating motor, a connecting rod, and a connecting block. The rotating motor is located on the outer wall of the bottom frame, and the fixed end of the rotating motor is slidably connected to the outer wall of the bottom frame. The output end of the rotating motor is fixedly connected to the turntable. The connecting block is located on the side of the turntable close to the rotating motor and is rotatably connected to the turntable. One end of the connecting rod is slidably connected to the bottom end of the connecting block, and the other end of the connecting rod is fixedly connected to the first filter screen.

[0016] Furthermore, the drive component is used to control the rotation of the turntable in the auxiliary component. The rotary motor is used as a power source to control the rotation of the turntable. The rotation of the turntable drives the connecting column to rotate, thereby breaking up the piled coffee bean raw materials. When the first filter screen is squeezed by the piled coffee beans, it moves downward, causing the squeezing column to squeeze the piezoelectric block, making the voltage of the piezoelectric block increase. At this time, the rotation amplitude of the rotary motor increases. Conversely, the smaller the voltage of the piezoelectric block, the smaller the rotation amplitude of the rotary motor. The connecting rod and the connecting block are used to drive the turntable to move together when the first filter screen moves downward.

[0017] The third transport platform includes a baffle and a base plate. There are two baffles located on both sides of the side plate. The bottom of the baffle is provided with a base plate, and the base plate is fixedly connected to the baffle.

[0018] Furthermore, the third transport platform is located at the bottom of the first transport platform. The third transport platform is used to collect and discharge the waste beans that have passed through the second transport platform. The baffle and the bottom plate are used to install the foundation.

[0019] The second transport platform includes a connector, which is equipped with a second filter screen. The second filter screen is fixedly connected to the baffle, and a detection component is provided at the top of the second filter screen.

[0020] Furthermore, the second transport platform is located between the first filter plate and the base plate. The second filter plate is used to collect waste beans that have passed through the first filter plate and to screen them using a detection component.

[0021] Compared with the prior art, the beneficial effects of the present invention are: 1. During operation, when coffee beans accumulate in a certain area of ​​the first filter plate, the weight presses down on the plate, causing the extrusion column to squeeze the piezoelectric block. The piezoelectric block provides feedback on the degree of accumulation through voltage changes, and the drive component adjusts the rotation speed of the rotating motor accordingly. The more severe the accumulation, the higher the motor speed, and the stronger the dispersing force of the turntable and connecting column. This can quickly disperse the accumulated coffee beans to all parts of the filter plate, ensuring that each coffee bean can contact the first filter plate and avoiding problems such as local accumulation and uneven screening.

[0022] 2. The spring and connecting rod design ensures that the first filter screen can automatically reset after the accumulation decreases, and the connecting rod can drive the turntable to make synchronous fine adjustments with the screen, ensuring that the scattering range and the accumulation area are accurately matched. It can maintain a stable screening rhythm without manual intervention, greatly increasing the amount of coffee beans processed per unit time and adapting to the needs of large-scale processing scenarios.

[0023] 3. During operation, the second filter screen first filters out extremely fine waste such as bean shells from the mixed materials. Then, through the linkage between the parallel electrodes of the detection component and the air outlet pipe, it can accurately distinguish between recyclable fine coffee beans and defective products. The parallel electrodes identify the material type by the difference in capacitance value. Normal fine coffee beans have a constant capacitance value, moldy beans and stones have an increased capacitance value due to the presence of moisture and minerals, and broken beans have a decreased capacitance value due to their low bulk density. When defective products are detected, the corresponding air outlet pipe immediately sprays high-pressure gas to remove them, preventing defective products from being mixed with fine coffee beans and preventing qualified fine coffee beans from being mistakenly discarded as waste. The screening accuracy is much higher than that of traditional single filter screen structures. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the first transport platform of the present invention; Figure 3 This is a schematic diagram of the structure of the second transport platform of the present invention; Figure 4 This is a schematic diagram of the detection component of the present invention; Figure 5 For the present invention Figure 2 Enlarged schematic diagram of part A in the middle; Figure 6 This is a schematic diagram of the structure of the auxiliary component of the present invention; Figure 7 For the present invention Figure 6 A magnified schematic diagram of part B in the middle.

[0025] In the diagram: 1. First transport platform; 11. Side plate; 12. Base frame; 121. Groove; 13. First filter screen; 2. Second transport platform; 21. Connector; 22. Second filter screen; 3. Third transport platform; 31. Baffle; 32. Base plate; 4. Auxiliary components; 41. Spring; 42. Extrusion column; 43. Piezoelectric block; 44. Turntable; 45. Connecting column; 46. Drive component; 461. Rotary motor; 462. Connecting rod; 463. Connecting block; 5. Detection component; 51. Parallel electrode; 52. Drain plate; 53. Top cover; 54. Air outlet pipe. Detailed Implementation

[0026] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example: Figures 1-7As shown, the present invention provides a technical solution for a conveying device for coffee bean processing with multi-layer screening function. The conveying device includes a first conveying table 1, a second conveying table 2 and a third conveying table 3. The surface of the first conveying table 1 is provided with an auxiliary component 4. The second conveying table 2 is located at the bottom of the first conveying table 1 and is provided with a detection component 5. The third conveying table 3 is located at the bottom of the second conveying table 2. The first conveying table 1 includes a side plate 11 and a bottom frame 12. There are two side plates 11 and the bottom frame 12 is located between the two side plates 11. The auxiliary component 4 includes a spring 41, a pressing column 42 and a piezoelectric block 43. A groove 121 is provided in the bottom frame 12. The piezoelectric block 43 is located at the bottom of the groove 121. The pressing column 42 is provided at the top of the piezoelectric block 43. The pressing column 42 is slidably connected to the inner wall of the groove 121. The spring 41 is sleeved on the pressing column 42.

[0028] Specifically, during coffee bean processing, a large quantity of raw coffee beans needs to be transported via a conveyor system. However, during transport, the raw coffee beans contain stones, bean husks, and waste beans, leading to a decrease in quality. Therefore, the raw coffee beans need to be screened during transport. Due to the large quantity of raw coffee beans, they easily accumulate during transport, affecting both transport and filtration efficiency. Furthermore, this accumulation means that only the bottom layer of beans is screened, while the top layer beans have a lower probability of being screened. The more raw coffee beans there are, the lower the screening rate of the top layer beans. Even after screening, the beans still contain bad beans and small beans. Bad beans are unusable, while small beans have other uses, so they also need to be extracted. The first transport platform 1 serves as the main transport aisle. The first conveyor table 2 is used to screen out the main coffee beans. The second conveyor table 3 is used to screen out small coffee beans, stones, and waste beans. The third conveyor table 4 is used to screen out even smaller materials such as bean shells. The auxiliary component 4 is used to control the rotation speed of the turntable 44 according to the amount of coffee bean raw material. The detection component 5 is used to detect the type of beans moving on the second conveyor table 2. Its two side plates 11 and the bottom frame 12 form a groove, and the auxiliary component 4 is located inside the bottom frame 12. When the extrusion column 42 moves, it will squeeze the top of the piezoelectric block 43. When the piezoelectric block 43 is compressed, its voltage changes. The longer the extrusion column 42 moves, the greater the voltage of the piezoelectric block 43. Conversely, the shorter the extrusion column 42 moves, the smaller the voltage of the piezoelectric block 43. The spring 41 is used to provide elastic potential energy.

[0029] like Figure 2 , Figure 5As shown, the auxiliary component 4 also includes a turntable 44 and a connecting column 45. The turntable 44 is located inside the bottom frame 12. There are several turntables 44. The turntable 44 is rotatably connected to the inner wall of the bottom frame 12. The turntable 44 is arranged in two rows at equal intervals. The turntable 44 is provided with a connecting column 45. The two ends of the connecting column 45 are fixedly connected to the turntable 44. The outer wall of the side plate 11 is provided with a drive component 46.

[0030] Specifically, the turntable 44 and the connecting column 45 are used to stir the coffee bean raw materials piled up in the bottom frame 12 to improve the screening efficiency. The drive component 46 is used to control the rotation of the turntable 44, which drives the connecting column 45 to rotate, and the rotation of the connecting column 45 breaks up the piled coffee bean raw materials.

[0031] like Figure 2 , Figure 6 As shown, the first transport platform 1 also includes a first filter screen 13. The top of the bottom frame 12 is fixedly connected to the bottom of the side plate 11. Several first filter screens 13 are provided at the bottom of the inner wall of the bottom frame 12. The first filter screens 13 are arranged at equal intervals. The first filter screens 13 are slidably connected to the inner wall of the groove 121. The extrusion column 42 is located at the bottom of the first filter screen 13.

[0032] The first filter plate 13 is located inside the bottom frame 12. Coffee bean raw materials first accumulate on the first filter plate 13, and then defective products fall through the first filter plate 13 onto the second transport platform 2. The extrusion column 42 in the first transport platform 1 is located at the bottom end of the first filter plate 13, and the two ends of the first filter are slidably connected to the bottom frame 12. The top end of the extrusion column 42 is fixedly connected to the bottom end of the first filter plate 13. The spring 41 sleeved on the extrusion column 42 is used to provide an elastic range. When transporting coffee bean raw materials, the raw materials accumulate on the first filter plate 13 at the corresponding position, causing the first filter plate 13 to move downward. The movement of the first filter plate 13 drives the extrusion column 42 to move, and the movement of the extrusion column 42 extrudes the piezoelectric block 43.

[0033] like Figure 3 , Figure 4 As shown, the detection component 5 includes a parallel electrode 51 and a flow guide plate 52. The surface of the flow guide plate 52 is provided with several discharge ports. The parallel electrode 51 is located inside the discharge port. The top of the flow guide plate 52 is provided with a top cover 53.

[0034] Specifically, the detection component 5 is located at the output end of the second transport platform 2. The diversion plate 52 is used to collect the beans in the second transport platform 2 and divert them to form multiple outlets. The outlets are used to allow individual beans to pass through. Several parallel electrodes 51 are provided and arranged in the outlets. Each outlet has two parallel electrodes 51. When the beans are discharged through the outlets, they will pass through the parallel electrodes 51, and a capacitance value is generated between the parallel electrodes 51. When the beans pass through the middle of the parallel electrodes 51, if the beans are normal small coffee beans, the capacitance value is constant. If the beans are moldy beans or stones, the capacitance value increases due to the presence of moisture and mold. If the beans are broken beans, the capacitance value decreases. The top cover 53 and the diversion plate 52 are combined to form a sealed space to prevent the beans from splashing.

[0035] like Figure 3 As shown, the air outlet pipe 54 is provided on the side of the flow guide plate 52 away from the first filter plate 13.

[0036] Specifically, one end of the vent pipe 54 is connected to an external pipe, and the other end of the vent pipe 54 is located at the bottom of the discharge port of the guide plate 52. The number of the output ends of the vent pipe 54 is the same as the number of discharge ports of the guide plate 52. The vent pipe 54 is used to discharge high-pressure gas to screen out waste beans when the parallel electrode 51 detects waste beans.

[0037] like Figure 6 , Figure 7 As shown, the drive assembly 46 includes a rotating motor 461, a connecting rod 462, and a connecting block 463. The rotating motor 461 is located on the outer wall of the bottom frame 12. The fixed end of the rotating motor 461 is slidably connected to the outer wall of the bottom frame 12. The output end of the rotating motor 461 is fixedly connected to the turntable 44. The connecting block 463 is located on the side of the turntable 44 close to the rotating motor 461. The connecting block 463 is rotatably connected to the turntable 44. One end of the connecting rod 462 is slidably connected to the bottom end of the connecting block 463, and the other end of the connecting rod 462 is fixedly connected to the first filter screen 13.

[0038] Specifically, the drive component 46 is used to control the rotation of the turntable 44 in the auxiliary component 4. The rotation motor 461 is used as a power source to control the rotation of the turntable 44. The rotation of the turntable 44 drives the connecting column 45 to rotate, thereby breaking up the piled coffee bean raw materials. When the first filter screen 13 is squeezed by the piled coffee beans and moves downward, it drives the squeezing column 42 to squeeze the piezoelectric block 43, making the voltage of the piezoelectric block 43 increase. At this time, the rotation amplitude of the rotation motor 461 increases. Conversely, the smaller the voltage of the piezoelectric block 43, the smaller the rotation amplitude of the rotation motor 461. The connecting rod 462 and the connecting block 463 are used to drive the turntable 44 to move together when the first filter screen 13 moves downward.

[0039] like Figure 3As shown, the third transport platform 3 includes a baffle 31 and a bottom plate 32. There are two baffles 31, which are located on both sides of the side plate 11. The bottom end of the baffle 31 is provided with a bottom plate 32, and the bottom plate 32 is fixedly connected to the baffle 31.

[0040] Specifically, the third transport platform 3 is located at the bottom of the first transport platform 1. The third transport platform 3 is used to collect and discharge the waste beans that have passed through the second transport platform 2. The baffle 31 and the base plate 32 are used to install the foundation.

[0041] like Figure 3 , Figure 4 As shown, the second transport platform 2 includes a connector 21, the connector 21 is provided with a second filter screen 22, the second filter screen 22 is fixedly connected to the baffle 31, and the top of the second filter screen 22 is provided with a detection component 5.

[0042] Specifically, the second transport platform 2 is located between the first filter plate 13 and the base plate 32. The second filter plate 22 is used to collect waste beans that have passed through the first filter plate 13 and to screen them through the detection component 5.

[0043] Working principle: During operation, coffee beans first enter the first transport table 1 and accumulate on the first filter plate 13 within the bottom frame 12. Qualified coffee beans are retained and transported to subsequent processes, while mixtures containing small defective products and waste fall through the mesh. Simultaneously, if too many coffee beans accumulate in a certain area of ​​the first filter plate 13, the plate will be pressed down, causing the extrusion column 42 to move downwards. This causes a voltage change in the piezoelectric block 43 within the extrusion groove 121, and the voltage signal is transmitted to the drive assembly. The drive assembly 46 adjusts the rotation speed of the motor 461 according to the voltage magnitude, driving the turntable 44 and connecting column 45 to rotate and break up the accumulated coffee beans. A spring 41 assists in resetting the filter plate, and the connecting rod 462 and connecting block 463 ensure that the turntable 44 adjusts slightly with the filter plate for precise breaking up of the beans. The mixed materials fall into the second transport platform 2 and onto the second filter screen 22. Very fine waste such as bean shells fall through the screen. The remaining materials are transported to the guide plate 52 of the detection component 5. After being diverted through the outlet, they pass through individually. The parallel electrode 51 in the outlet identifies the materials by the difference in capacitance value. Normal fine coffee beans have a constant capacitance value and are collected as they fall through the outlet. Moldy beans and stones have an increased capacitance value due to the presence of moisture or minerals, while broken beans have a decreased capacitance value due to their volume density. These two types of waste products will trigger the corresponding air outlet pipe 54 to spray high-pressure gas to remove them. The third transport platform 3 receives the bean shell waste falling from the second platform through the side baffles 31 and the bottom plate 32. Finally, the multi-layer screening and classification process in the coffee bean processing and transportation process is completed.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A coffee bean processing conveying device having a multi-layer screening function, characterized by: The conveying device comprises a first conveying table (1), a second conveying table (2) and a third conveying table (3), the surface of the first conveying table (1) is provided with an auxiliary assembly (4), the second conveying table (2) is located at the bottom end of the first conveying table (1), the surface of the second conveying table (2) is provided with a detection assembly (5), and the third conveying table (3) is located at the bottom end of the second conveying table (2). The auxiliary assembly (4) comprises a spring (41), a pressing column (42) and a piezoelectric block (43), a groove (121) is formed in the bottom frame (12), the piezoelectric block (43) is located at the bottom end inside the groove (121), the top end of the piezoelectric block (43) is provided with the pressing column (42), the pressing column (42) is in sliding connection with the inner wall of the groove (121), and the spring (41) is sleeved on the pressing column (42).

2. The coffee bean processing conveying device with multi-layer screening function according to claim 1, characterized in that: The auxiliary assembly (4) further comprises a rotating disc (44) and a connecting column (45), the rotating disc (44) is located in the bottom frame (12), the rotating disc (44) is provided with a plurality of rotating discs (44), the rotating disc (44) is provided with two rows of rotating discs (44) arranged at equal intervals, the rotating disc (44) is provided with the connecting column (45), the connecting column (45) is fixedly connected with the rotating disc (44) at both ends, and the outer wall of the bottom frame (12) is provided with a driving assembly (46).

3. The coffee bean processing conveying device with multi-layer screening function according to claim 1, characterized in that: The first conveying table (1) further comprises a first filter screen (13), the top end of the bottom frame (12) is fixedly connected with the bottom end of the side plate (11), the inner wall bottom end of the bottom frame (12) is provided with a plurality of first filter screens (13), the first filter screens (13) are arranged at equal intervals, the first filter screens (13) are in sliding connection with the inner wall of the groove (121), and the pressing column (42) is located at the bottom end of the first filter screen (13).

4. The coffee bean processing conveying device with multi-layer screening function according to claim 1, characterized in that: The detection assembly (5) comprises parallel electrodes (51) and a drainage plate (52), a plurality of discharge ports are formed in the surface of the drainage plate (52), the parallel electrodes (51) are located in the discharge ports, and the top end of the drainage plate (52) is provided with a top cover (53).

5. The coffee bean processing conveying device with multi-layer screening function according to claim 4, characterized in that: The side, away from the first filter screen (13), of the drainage plate (52) is provided with an air outlet pipe (54).

6. The coffee bean processing conveying device with multi-layer screening function according to claim 2, characterized in that: The driving assembly (46) comprises a rotating motor (461), a connecting rod (462) and a connecting block (463), the rotating motor (461) is located on the outer wall of the bottom frame (12), the fixed end of the rotating motor (461) is in sliding connection with the outer wall of the bottom frame (12), the output end of the rotating motor (461) is fixedly connected with the rotating disc (44), the connecting block (463) is located on the side of the rotating disc (44) close to the rotating motor (461), the connecting block (463) is in rotary connection with the rotating disc (44), one end of the connecting rod (462) is in sliding connection with the bottom end of the connecting block (463), the other end of the connecting rod (462) is fixedly connected with the first filter screen (13), and the rotating motor (461) is in electrical connection with the piezoelectric block (43).

7. The coffee bean processing conveying device with multi-layer screening function according to any one of claims 1-4, characterized in that: The third conveying table (3) comprises a baffle (31) and a bottom plate (32), two baffle (31) are arranged on both sides of the side plate (11), the bottom plate (32) is arranged at the bottom end of the baffle (31), and the bottom plate (32) is fixedly connected with the baffle (31).

8. The coffee bean processing conveying device with multi-layer screening function according to any one of claims 1-4, characterized in that: The second conveying table (2) comprises a connecting piece (21), the connecting piece (21) is provided with a second filter screen plate (22), the second filter screen plate (22) is fixedly connected with the baffle (31), and the second filter screen plate (22) is provided with a detection assembly (5) at the top end.

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