Harvester cleaning device and harvester

Abstract

The invention provides a harvester cleaning device and a harvester, and the harvester cleaning device comprises a rack, a threshing cylinder, a concave grid, a vibrating screen assembly, a return disc assembly and a fan, the return disc assembly is arranged between the concave grid and the vibrating screen and is close to the rear part of the threshing cylinder; the conveying belt is rotationally arranged from back to front, the driving part is used for driving the conveying belt to rotate, the conveying belt rotates to convey grains and impurities falling onto the conveying belt to the front portion of the vibrating screen assembly for secondary cleaning, and the fan is arranged below the front end of the vibrating screen assembly. And the fan is matched with the vibrating screen to realize the cleaning effect on the grains. Residual grain mixtures in the separation section of the roller are conveyed to the front portion of the vibrating screen assembly through the conveying belt and are subjected to the complete cleaning process again, the screen surface load is reduced, the breakage rate is reduced, the cleaning loss is reduced, the cleaning effect is improved, the return stability is enhanced, and the vibration rate of the whole machine and the part damage rate are reduced.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery, and more particularly to a harvester cleaning device and a harvester. Background Technology

[0002] When harvesting different crops at different maturity stages, some grains may fall off in the separating section. If there is too much grain in the separating section, the cleaning process may not be fast enough, leading to grain loss. In related technologies, the cleaning device often uses a linkage-type return plate connected to the screen frame for return, which is not ideal in terms of cleaning effect and efficiency. It can also easily cause grain breakage to some extent, increasing the grain breakage rate and loss rate. The vibration generated during the cleaning process can also increase the probability of damage to harvester parts.

[0003] Therefore, it is necessary to provide a harvester cleaning device and a harvester to overcome the defects mentioned above. Summary of the Invention

[0004] The purpose of this invention is to provide a harvester cleaning device and a harvester. By designing the harvester cleaning device, a conveyor belt is used to transport the mixture of residual grains from the drum separator section to the front of the vibrating screen assembly, where it undergoes a complete cleaning process again. This reduces the screen surface load, reduces the breakage rate, reduces cleaning losses, improves the cleaning effect, enhances the stability of the return feed, and reduces the vibration of the whole machine and the damage rate of parts.

[0005] According to one aspect of the present invention, a harvester cleaning device is provided, comprising a frame, a threshing drum, a concave sieve, a vibrating screen assembly, a return plate assembly, and a blower, with the harvester's forward direction as the front. The threshing drum is fixed on the frame, and the concave sieve is fixed on the frame in a U-shape, positioned below the threshing drum and forming a threshing gap with the threshing drum. The vibrating screen assembly is positioned below the concave sieve, and the return plate assembly is positioned between the concave sieve and the vibrating screen and near the rear of the threshing drum. The return plate assembly includes a conveyor belt rotatably arranged from rear to front and a drive component for driving the conveyor belt to rotate. The rotation of the conveyor belt is used to transport the grains and impurities that fall onto the conveyor belt to the front of the vibrating screen assembly for secondary cleaning. The blower is positioned below the front end of the vibrating screen assembly, and the blower cooperates with the vibrating screen to achieve the grain cleaning effect.

[0006] The above scheme uses a conveyor belt to transport the mixture of impurities and grains from the drum separator section to the front of the vibrating screen assembly, where it undergoes a complete cleaning process again. This reduces the screen surface load, lowers the breakage rate, reduces cleaning losses, improves the cleaning effect, enhances the stability of the return feed, and reduces overall machine vibration and parts damage rate.

[0007] Preferably, the driving component includes a first rotating shaft and a second rotating shaft arranged sequentially from front to back at both ends of the conveyor belt, and the rotation of the first rotating shaft and the second rotating shaft drives the conveyor belt to rotate.

[0008] Preferably, the harvester cleaning device further includes a first sprocket, a second sprocket, and a third sprocket directly connected by a chain. The engine drives the first sprocket to rotate, which in turn drives the second and third sprockets to rotate. The second sprocket drives the vibrating screen assembly, and the third sprocket drives the first rotating shaft to rotate, thereby driving the conveyor belt to rotate. Furthermore, when the engine starts and the main clutch engages, the first sprocket rotates, which in turn drives the second and third sprockets to rotate synchronously via the chain. This design allows the return plate assembly and the vibrating screen to share a single output power, reducing the number of parts, improving structural simplicity, and saving costs.

[0009] Preferably, the first rotating shaft includes a shaft tube and shaft heads fixed to both ends of the shaft tube. The shaft heads are provided with grooves, and the inner side of the conveyor belt has guide rails arranged in the front-to-back direction, with the guide rails being engaged in the grooves. This design allows the grooves to limit the left and right movement of the conveyor belt's guide rails, thereby making the operation of the return tray assembly more stable.

[0010] Preferably, the second rotating shaft has the same structure as the first rotating shaft.

[0011] Preferably, the return plate assembly further includes a first bearing sleeved at both ends of the first rotating shaft and a second bearing sleeved at both ends of the second rotating shaft. The first bearing is connected to the frame via a first bearing housing sleeved on the first bearing, and the second bearing is connected to the frame via a second bearing housing sleeved on the second bearing. There are two of each of the following: first bearing, second bearing, first bearing housing, and second bearing housing.

[0012] Preferably, the return disc assembly further includes tensioning components connected between the frame and the second bearing seat, which are used to adjust the tension of the conveyor belt. Further, the tensioning components include two identical components located at both ends of the second rotating shaft, arranged symmetrically with respect to the left-right direction of the harvester.

[0013] Preferably, the tensioning component includes a tensioning bolt, a tensioning nut, an adjusting plate sleeved on the second rotating shaft, and a limiting plate fixed to the frame; the adjusting plate is placed between the second bearing seat and the frame and connected to the frame by the tensioning bolt and the tensioning nut, and the tension of the conveyor belt is adjusted by tightening or loosening the adjusting bolt; the limiting plate includes two plates arranged parallel to each other vertically, and the adjusting plate is placed between the two limiting plates to limit the vertical movement of the adjusting plate, and at the same time, it can help guide the movement of the adjusting plate in the front-back direction when adjusting the tension of the conveyor belt.

[0014] Preferably, the frame is also provided with an elongated hole at the position corresponding to the adjustment plate. The second bearing seat is fixed by bolts that are sequentially inserted into the second bearing seat, the adjustment plate, and the elongated hole. When it is necessary to tighten or loosen the conveyor belt, the bolts are loosened for adjustment.

[0015] Preferably, the adjusting plate has a connecting part arranged in the front-to-back direction and a bending part extending outward from the harvester in the left-to-right direction. The tensioning bolt is sequentially inserted into the bending part and the frame in the front-to-back direction. By adjusting the tensioning bolt, the distance between the second output shaft and the first output shaft can be adjusted to further tension or relax the conveyor belt.

[0016] Preferably, the return disc assembly also includes dust covers placed on the left and right end faces of the transmission belt, and the dust covers are fixed to the frame. This design protects against dust in the gaps between the harvester's left and right sides and the frame sidewalls, preventing large dust particles from entering the conveyor belt.

[0017] Preferably, the return plate assembly further includes side baffles positioned on the left and right sides above the conveyor belt, and a rear baffle positioned on the rear side above the drive belt. The side baffles are arranged along the front-to-back direction and fixed to the frame, while the rear baffle is fixed to the rear end of the threshing drum. The side baffles on both sides can protect against dust in the gaps between the harvester and the side walls of the frame, preventing large dust particles from entering the conveyor belt. The rear baffle helps reduce grain loss.

[0018] Preferably, the harvester cleaning device further includes a tension sprocket and a tension wheel, respectively positioned on the outside of the chain and arranged opposite to each other. The tension sprocket meshes with the chain, and the tension wheel is positioned on the other side of the chain opposite to the tension sprocket and abuts against the chain. This design helps prevent chain slippage.

[0019] Preferably, the vibrating screen assembly includes an upper step plate placed above the blower and a screening component placed below the upper step plate and behind the blower. The conveyor belt rotates to transport the grains and impurities that fall onto the conveyor belt to the upper step plate for secondary cleaning.

[0020] Preferably, the screening component includes an upper screen and a lower screen positioned below the upper screen.

[0021] Preferably, the fan includes a housing, a fan shaft placed inside the housing, and blades arranged around the fan shaft. The housing includes a first housing and a second housing arranged side by side in the left-right direction and having the same structure. The housing also includes a lower mesh plate connected to the lower middle part of the first housing and the second housing, and a partition plate erected between the first housing and the second housing.

[0022] Preferably, the first housing includes a first main body, a first upper cover extending from the first main body toward the screening component, a first lower cover extending from the first main body toward the screening component, and a first side cover located at the end of the first main body. A first air outlet duct for supplying air to the screening component is formed between the first upper cover, the first lower cover, the first side cover, and the partition. The first housing also includes a first partition located in the first air outlet duct. The first partition divides the first air outlet duct into a first sub-air duct facing the upper screen and a second sub-air duct facing the lower screen. The fan also includes a first air guide plate located in the second sub-air duct for adjusting the airflow direction.

[0023] Preferably, the second housing includes a second main body, a second upper cover extending from the second main body toward the screening component, a second lower cover extending from the second main body toward the screening component, and a second side cover located at the end of the second main body. A second air outlet duct for supplying air to the screening component is formed between the second upper cover, the second lower cover, the second side cover, and the partition. The second housing also includes a second partition located in the second air outlet duct. The partition divides the first air outlet duct into a third sub-air duct facing the upper screen and a fourth sub-air duct facing the lower screen. The fan also includes a second air guide plate located in the fourth sub-air duct for adjusting the airflow direction.

[0024] Preferably, the housing further includes a reinforcing plate connected in the left-right direction to the front side of the first main body and the second main body.

[0025] Preferably, the housing further includes an upper cover connecting plate connected between the first upper cover plate and the second upper cover plate.

[0026] According to another aspect of the present invention, a harvester is provided, including a cab, wheels, and the harvester cleaning device described above.

[0027] The present invention provides a harvester cleaning device and harvester, which conveys the mixture of impurities and grains in the drum separator section to the front of the vibrating screen assembly by a conveyor belt, so that it undergoes a complete cleaning process again, thereby reducing the screen surface load, reducing the breakage rate, reducing cleaning losses, improving the cleaning effect, enhancing the stability of the return feed, and reducing the vibration of the whole machine and the damage rate of parts. Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] Figure 1 A three-dimensional schematic diagram of a portion of the harvester's structure;

[0030] Figure 2 A partial structural side view of the harvester's cleaning device;

[0031] Figure 3 This is a schematic diagram of the return disk assembly;

[0032] Figure 4 This is a schematic diagram of the dust cover structure;

[0033] Figure 5 This is a cross-sectional view of the first rotation axis;

[0034] Figure 6 This is a side view of a portion of the harvester's structure;

[0035] Figure 7 Another side view of the structure of the cleaning device of the harvester;

[0036] Figure 8 This is a schematic diagram of a fan.

[0037] Figure 9 for Figure 1 A magnified view of a portion of position A in the middle;

[0038] Figure 10 This is a schematic diagram of the harvester as a whole.

[0039] Explanation of icon numbers:

[0040] 1. Frame; 2. Threshing drum; 3. Concave plate screen; 4. Vibrating screen assembly; 5. Return plate assembly; 6. Fan; 7. Tensioner wheel; 8. First sprocket; 9. Third sprocket; 10. Chain; 11. Tensioner sprocket; 12. Second sprocket; 13. Cab; 14. Wheels; 401. Upper step plate; 402. Screening components; 4021. Upper screen; 4022. Lower screen; 501. Conveyor belt; 502. Drive components; 502 a. First rotating shaft; 502b. Second rotating shaft; 503a. First bearing; 503b. Second bearing; 504a. First bearing housing; 504b. Second bearing housing; 505. Tensioning component; 5051. Adjusting plate; 5052. Tensioning bolt; 5053. Tensioning nut; 5054. Limiting plate; 5021a. Shaft head; 5022a. Shaft tube; 506. Side baffle; 507. Dust cover; 508. Rear baffle; 601. Fan shaft; 602. Housing; 602a. First housing; 602b. Second housing; 6021a. First main body; 6021b. Second main body; 6022a. First upper cover plate; 6022b. Second upper cover plate; 6023a. First partition; 6023b. Second partition; 6024a. First lower cover plate; 6024b. Second lower cover plate; 6025. Upper cover connecting plate; 6026. Partition plate; 6027, Reinforcing plate; 6028, Lower perforated plate; 6029a, First side cover plate; 6029b, Second side cover plate; 603, Blade; 604a, First air guide plate; 604b, Second air guide plate; A1, Slot; B1, Guide rail; Fa, First air outlet duct; Fb, Second air outlet duct; F1a, First sub-air duct; F1b, Third sub-air duct; F2a, Second sub-air duct; F2b, Fourth sub-air duct; 100, Harvester. Detailed Implementation

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0043] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0044] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and 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 based on the specific circumstances.

[0045] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0047] The embodiments for carrying out this application will be described with reference to the accompanying drawings. It should be noted that, in the following description, the direction of the straight line pointing to F is defined as the "front" of the harvester (refer to...). Figure 1 ), and set the direction of the straight line pointing to B as the "rear" of the harvester (refer to...). Figure 1 ), and define the direction of the straight line pointing to L as the "left" of the harvester (refer to...). Figure 1 ), and define the direction of the straight line pointing to R as the "right" of the harvester (refer to...). Figure 1 ).

[0048] See Figures 1 to 9As shown, this embodiment provides a harvester cleaning device. Taking the harvester's forward direction as the front, it includes a frame 1, a threshing drum 2, a concave screen 3, a vibrating screen assembly 4, a return plate assembly 5, and a blower 6. The threshing drum 2 is fixed on the frame 1. The concave screen 3 is U-shaped and fixed on the frame 1, positioned below the threshing drum 2 and forming a threshing gap with it. The vibrating screen assembly 4 is positioned below the concave screen 3. The return plate assembly 5 is positioned between the concave screen 3 and the vibrating screen, near the rear of the threshing drum 2. The return plate assembly 5 includes components extending from the rear to the front. The front-rotating conveyor belt 501 and the drive component 502 for driving the conveyor belt 501 to rotate are used to transport the grains and impurities that fall onto the conveyor belt 501 to the front of the vibrating screen assembly 4 for secondary cleaning. The grains and impurities undergo a complete cleaning process again, reducing the screen surface load, reducing the breakage rate, reducing cleaning losses, improving the cleaning effect, enhancing the stability of the return, and reducing the vibration of the whole machine and the damage rate of parts. The blower 6 is located below the front end of the vibrating screen assembly 4. The blower 6 works with the vibrating screen to achieve the cleaning effect on the grains.

[0049] See Figure 2 and Figure 3 As shown, the driving component 502 includes a first rotating shaft 502a and a second rotating shaft 502b arranged sequentially from front to back at both ends of the conveyor belt 501. The rotation of the first rotating shaft 502a and the second rotating shaft 502b drives the conveyor belt 501 to rotate.

[0050] The harvester cleaning device also includes a first sprocket 8, a second sprocket 12, and a third sprocket 9 directly connected by a chain 10. The engine drives the first sprocket 8 to rotate. Specifically, when the engine starts and the main clutch is engaged, the first sprocket 8 rotates, thereby causing the chain 10 to rotate. This enables the first sprocket 8 to drive the rotation of the second sprocket 12 and the third sprocket 9, allowing the return plate assembly 5 and the vibrating screen to share the same output power. The second sprocket 12 drives the vibrating screen assembly 4 to work, and the third sprocket 9 drives the first rotating shaft 502a to rotate, thereby driving the conveyor belt 501 to rotate. This reduces the number of parts, improves the simplicity of the structure, and saves costs.

[0051] The harvester cleaning device also includes a tension sprocket 11 and a tension wheel 7, which are respectively placed on the outside of the chain 10 and arranged opposite to each other. The tension sprocket 11 is engaged with the chain 10, and the tension wheel 7 is placed on the other side of the chain 10 opposite to the tension sprocket 11 and abuts against the chain 10, which helps to prevent the chain 10 from jumping.

[0052] See Figure 3As shown, the return disk assembly 5 also includes a first bearing 503a sleeved at both ends of the first rotating shaft 502a and a first bearing 503b sleeved at both ends of the second rotating shaft 502b. The first bearing 503a is connected to the frame 1 through a first bearing seat 504a sleeved on the first bearing 503a, and the first bearing 503b is connected to the frame 1 through a second bearing seat 504b sleeved on the first bearing 503b. There are two of each of the following: first bearing 503a, first bearing 503b, first bearing seat 504a, and second bearing seat 504b.

[0053] See Figure 1 and Figure 3 As shown, the return plate assembly 5 also includes side baffles 506 placed on the left and right sides above the conveyor belt 501 and a rear baffle 508 placed on the rear side above the transmission belt. The side baffles 506 are arranged in the front-back direction and fixed to the frame 1, and the rear baffle 508 is fixed to the rear end of the threshing drum 2. The side baffles 506 on both sides can protect and block the dust in the gap between the left and right sides of the harvester and the side wall of the frame 1, preventing large dust particles from entering the conveyor belt 501. The rear baffle 508 helps to reduce grain loss.

[0054] See Figure 3 and Figure 4 As shown, the return disc assembly 5 also includes dust covers 507 placed on the left and right ends of the transmission belt. The dust covers 507 are fixed to the frame 1 and can protect and block the dust in the gap between the left and right sides of the harvester and the side wall of the frame 1, preventing large dust particles from entering the inside of the conveyor belt 501.

[0055] See Figure 3 and Figure 5 As shown, the first rotating shaft 502a includes a shaft tube 5022a and shaft heads 5021a fixed to the two ends of the shaft tube 5022a. The shaft head 5021a is provided with a groove A1. The inner side of the conveyor belt 501 has a guide rail B1 arranged in the front-back direction. The guide rail B1 is engaged in the groove A1, so that the groove A1 limits the guide rail B1 of the conveyor belt 501 to the left and right, thereby making the working state of the return plate assembly 5 more stable. The second rotating shaft 502b has the same structure as the first rotating shaft 502a.

[0056] See Figure 6 As shown, the return disc assembly 5 also includes tensioning components 505 connected between the frame 1 and the second bearing seat 504b respectively. The tension of the conveyor belt 501 can be adjusted by adjusting the tensioning components 505. The tensioning components 505 include two that are respectively placed at both ends of the second rotating shaft 502b. They have the same structure and are symmetrically arranged with respect to the left and right directions of the harvester.

[0057] The tensioning component 505 includes a tensioning bolt 5052, a tensioning nut 5053, an adjusting plate 5051 sleeved on the second rotating shaft 502b, and a limiting plate 5054 fixed to the frame 1. The adjusting plate 5051 is placed between the second bearing seat 504b and the frame 1 and is connected to the frame 1 by the tensioning bolt 5052 and the tensioning nut 5053. The tension of the conveyor belt 501 is adjusted by tightening or loosening the adjusting bolt. The limiting plate 5054 includes two plates arranged parallel to each other. The adjusting plate 5051 is placed between the two limiting plates 5054 to limit the vertical movement of the adjusting plate 5051. At the same time, when the tension of the conveyor belt 501 is adjusted, it can help guide the movement of the adjusting plate 5051 in the front-back direction.

[0058] The frame 1 is also provided with an elongated hole (not shown) at the position corresponding to the adjustment plate 5051. The second bearing seat 504b is fixed by bolts that pass through the second bearing seat 504b, the adjustment plate 5051 and the elongated hole in sequence. When it is necessary to tighten or loosen the conveyor belt 501, the bolts are loosened for adjustment.

[0059] The adjusting plate 5051 has a connecting part (not labeled) arranged in the front-to-back direction and a bending part (not labeled) extending outward from the harvester in the left-to-right direction. The tensioning bolt 5052 is sequentially inserted into the bending part and the frame 1 in the front-to-back direction. By adjusting the tensioning bolt 5052, the distance between the second output shaft and the first output shaft can be adjusted to further tension or loosen the conveyor belt 501.

[0060] See Figure 7 As shown, the vibrating screen assembly 4 includes an upper step plate 401 placed above the blower 6 and a screening component 402 placed below the upper step plate 401 and behind the blower 6. The screening component 402 includes an upper screen 4021 and a lower screen 4022 placed below the upper screen 4021. The conveyor belt 501 rotates to transport the grains and impurities that fall onto the conveyor belt 501 to the upper step plate 401 for secondary cleaning.

[0061] See Figure 8 and Figure 9 As shown, the fan 6 includes a housing 602, a fan shaft 601 placed inside the housing 602, and blades 603 arranged around the fan shaft 601. The housing 602 includes a first housing 602a and a second housing 602b arranged side by side in the left-right direction and having the same structure. The housing 602 also includes a lower mesh plate 6028 connected to the lower middle part of the first housing 602a and the second housing 602b, and a partition plate 6026 erected between the first housing 602a and the second housing 602b.

[0062] The first housing 602a includes a first main body 6021a, a first upper cover plate 6022a extending from the first main body 6021a toward the screening component 402, a first lower cover plate 6024a extending from the first main body 6021a toward the screening component 402, and a first side cover plate 6029a located at the end of the first main body 6021a. A first air outlet duct Fa for supplying air to the screening component 402 is formed between the first upper cover plate 6022a, the first lower cover plate 6024a, the first side cover plate 6029a, and the partition plate 6026. The first housing 602a also includes a first partition portion 6023a located in the first air outlet duct Fa. The first partition portion 6023a divides the first air outlet duct Fa into a first sub-air duct F1a facing the upper screen 4021 and a second sub-air duct F2a facing the lower screen 4022. The fan 6 also includes a first air guide plate 604a located in the second sub-air duct F2a for adjusting the air direction.

[0063] The second housing 602b includes a second main body 6021b, a second upper cover plate 6022b extending from the second main body 6021b toward the screening member 402, a second lower cover plate 6024b extending from the second main body 6021b toward the screening member 402, and a second side cover plate 6029b located at the end of the second main body 6021b. A second air outlet duct Fb for supplying air to the screening member 402 is formed between the second upper cover plate 6022b, the second lower cover plate 6024b, the second side cover plate 6029b, and the partition plate 6026. The second housing 602b also includes a second partition 6023b located in the second air outlet duct Fb. The partition divides the first air outlet duct Fa into a third sub-air duct F1b disposed toward the upper screen 4021 and a fourth sub-air duct F2b disposed toward the lower screen 4022. The fan 6 also includes a second air guide plate 604b disposed in the fourth sub-air duct F2b for adjusting the air direction.

[0064] The housing 602 also includes a reinforcing plate 6027 connected in the left-right direction to the front side of the first main body 6021a and the second main body 6021b; the housing 602 also includes an upper cover connecting plate 6025 connected between the first upper cover plate 6022a and the second upper cover plate 6022b.

[0065] See Figure 10 As shown, according to another aspect of the present invention, a harvester is provided, including a cab 13, wheels 14, and the harvester cleaning device described above.

[0066] The present invention provides a harvester cleaning device and harvester, which conveys the mixture of impurities and grains in the drum separator section to the front of the vibrating screen assembly by a conveyor belt, so that it undergoes a complete cleaning process again, thereby reducing the screen surface load, reducing the breakage rate, reducing cleaning losses, improving the cleaning effect, enhancing the stability of the return feed, and reducing the vibration of the whole machine and the damage rate of parts.

[0067] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A harvester cleaning device, with the forward direction of the harvester as the forward direction, characterized in that, include: frame; A threshing drum, which is fixed to the frame; A concave sieve, which is fixed in a U-shape on the frame, is placed below the threshing drum and forms a threshing gap with the threshing drum; A vibrating screen assembly, wherein the vibrating screen assembly is positioned below the concave plate screen; A return plate assembly is placed between the concave sieve and the vibrating sieve and near the rear of the threshing drum. The return plate assembly includes a conveyor belt that rotates from back to front and a drive component for driving the conveyor belt to rotate. The rotation of the conveyor belt is used to transport the grains and impurities that fall onto the conveyor belt to the front of the vibrating sieve assembly for secondary cleaning. A blower is placed below the front end of the vibrating screen assembly. The blower works in conjunction with the vibrating screen to clean the grains.

2. The harvester cleaning device as described in claim 1, characterized in that, The driving component includes a first rotating shaft and a second rotating shaft arranged sequentially from front to back at both ends of the conveyor belt. The rotation of the first rotating shaft and the second rotating shaft drives the conveyor belt to rotate.

3. A harvester cleaning device as described in claim 2, characterized in that, It also includes a first sprocket, a second sprocket, and a third sprocket directly connected by a chain. The engine drives the first sprocket to rotate, which in turn drives the second and third sprockets to rotate. The second sprocket drives the vibrating screen assembly to work, and the third sprocket drives the first rotating shaft to rotate, thereby driving the conveyor belt to rotate.

4. A harvester cleaning device as described in claim 3, characterized in that, The first rotating shaft includes a shaft tube and shaft heads fixed to both ends of the shaft tube. The shaft heads are provided with slots. The inner side of the conveyor belt has guide rails arranged in the front-back direction, and the guide rails are engaged in the slots.

5. A harvester cleaning device as described in claim 4, characterized in that, The return plate assembly further includes a first bearing sleeved at both ends of the first rotating shaft and a second bearing sleeved at both ends of the second rotating shaft. The first bearing is connected to the frame through a first bearing seat sleeved on the first bearing, and the second bearing is connected to the frame through a second bearing seat sleeved on the second bearing.

6. A harvester cleaning device as described in claim 5, characterized in that, The return tray assembly also includes tensioning components connected between the frame and the second bearing seat, which are used to adjust the tension of the conveyor belt.

7. A harvester cleaning device as described in claim 6, characterized in that, The tensioning component includes a tensioning bolt, a tensioning nut, an adjusting plate sleeved on the second rotating shaft, and a limiting plate fixed to the frame. The adjusting plate is placed between the second bearing seat and the frame and connected to the frame through the tensioning bolt and the tensioning nut. The tension of the conveyor belt is adjusted by tightening or loosening the adjusting bolt. The limiting plate includes two plates arranged parallel to each other vertically, and the adjusting plate is placed between the limiting plates.

8. A harvester cleaning device as described in claim 7, characterized in that, The return tray assembly also includes dust covers placed on the left and right end faces of the transmission belt, and the dust covers are fixed to the frame.

9. A harvester cleaning device as described in claim 8, characterized in that, The return plate assembly also includes side baffles placed on the left and right sides above the conveyor belt and a rear baffle placed on the rear side above the transmission belt. The side baffles are arranged in the front-back direction and fixed to the frame, and the rear baffle is fixed to the rear end of the threshing drum.

10. A harvester cleaning device as described in claim 9, characterized in that, It also includes a tension sprocket and a tension wheel, which are respectively located on the outside of the chain and arranged opposite to each other. The tension sprocket is engaged with the chain, and the tension wheel is located on the other side of the chain and abuts against the chain.

11. A harvester cleaning device as described in claim 1 or 10, characterized in that, The vibrating screen assembly includes an upper step plate positioned above the fan and a screening component positioned below the upper step plate and behind the fan. The conveyor belt rotates to transport the grains and impurities that fall onto the conveyor belt to the upper step plate for secondary cleaning.

12. A harvester cleaning device as described in claim 11, characterized in that, The screening component includes an upper sieve and a lower sieve positioned below the upper sieve.

13. A harvester cleaning device as described in claim 12, characterized in that, The fan includes a housing, a fan shaft placed inside the housing, and blades arranged around the fan shaft. The housing includes a first housing and a second housing arranged side by side in the left-right direction and having the same structure. The housing also includes a lower perforated plate connected to the lower middle part of the first housing and the second housing, and a partition plate erected between the first housing and the second housing.

14. A harvester cleaning device as described in claim 13, characterized in that, The first housing includes a first main body, a first upper cover extending from the first main body toward the screening component, a first lower cover extending from the first main body toward the screening component, and a first side cover located at the end of the first main body. A first air outlet duct for supplying air to the screening component is formed between the first upper cover, the first lower cover, the first side cover, and the partition. The first housing also includes a first partition located in the first air outlet duct. The first partition divides the first air outlet duct into a first sub-air duct facing the upper screen and a second sub-air duct facing the lower screen. The fan also includes a first air guide plate located in the second sub-air duct for adjusting the air direction.

15. A harvester, characterized in that, It includes a cab, wheels, and a harvester cleaning device as described in claim 1 or claim 14.

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