Harvester cleaning system with multi-stage cleaning function

Abstract

The invention relates to a harvester cleaning system with a multi-stage cleaning function, and belongs to the technical field of agricultural machinery. The problems of low cleaning efficiency and effect in the prior art are solved. Comprising a first-stage cleaning fan, a cleaning shaking plate, a second-stage cleaning fan, a step plate and a reciprocating type vibrating screen, and the cleaning shaking plate is located below an axial flow roller; the first-stage cleaning fan is located in front of the cleaning shaking plate and used for conducting first-stage cleaning on the materials; the step plate is located below the tangential flow roller, and the reciprocating type vibrating screen is located behind the step plate. The stepped plate is used for conveying materials threshed by the tangential flow roller and materials from the cleaning shaking plate to the reciprocating type vibrating screen; the second-stage cleaning fan is positioned in front of the reciprocating type vibrating screen and is used for carrying out second-stage cleaning on the materials; the cleaning shaking plate, the step plate and the reciprocating type vibrating screen are in linkage through a connecting rod assembly. According to the multi-stage cleaning device, threshed materials can be subjected to multi-stage cleaning treatment, so that the working efficiency of the harvester and the cleaning rate of grains are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery, and particularly relates to a thresher cleaning system with multi-stage cleaning functions. Background Art

[0002] The cleaning system of a combine harvester is a key component that determines the harvesting quality. Traditional cleaning systems usually adopt a combination of "sieve + fan" to directly clean the threshed materials. However, the threshed materials contain a large amount of impurities such as broken straws, broken leaves, and dust. Directly entering the cleaning system will cause sieve holes to be blocked, air flow efficiency to decline, increase energy consumption and cleaning load. Especially in high-yield or humid environments, the cleaning efficiency and effect are significantly reduced. Therefore, there is an urgent need for an efficient cleaning system to achieve multi-stage separation of impurities and improve the cleaning efficiency and effect. Summary of the Invention

[0003] Aiming at the problem of poor cleaning efficiency of the above-mentioned existing technology, the present invention aims to provide a thresher cleaning system with multi-stage cleaning functions. The present invention is a cleaning system with multi-stage cleaning functions that combines multi-stage screening and air flow separation, which performs multi-stage cleaning treatment on the threshed materials, can improve the impurity separation efficiency, reduce the load of the cleaning system, and thus improve the operation efficiency of the thresher and the cleaning rate of grains.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A thresher cleaning system with multi-stage cleaning functions, the thresher is provided with an axial flow cylinder 1 and a tangential flow cylinder 2, the cleaning system includes a primary cleaning fan 3, a cleaning vibrating plate 4, a secondary cleaning fan 5, a stepped plate 6 and a reciprocating vibrating screen 7. The cleaning vibrating plate 4 is located below the axial flow cylinder 1; the primary cleaning fan 3 is located in front of the cleaning vibrating plate 4 and is used for performing primary cleaning on the materials; the stepped plate 6 is located below the tangential flow cylinder 2, and the reciprocating vibrating screen 7 is located behind the stepped plate 6; the stepped plate 6 is used for conveying the materials threshed by the tangential flow cylinder 2 and the materials from the cleaning vibrating plate 4 onto the reciprocating vibrating screen 7; the secondary cleaning fan 5 is located in front of the reciprocating vibrating screen 7 and is used for performing secondary cleaning on the materials; the cleaning vibrating plate 4, the stepped plate 6 and the reciprocating vibrating screen 7 are linked by a connecting rod assembly.

[0006] Further, the connecting rod assembly includes two first swing arms 8 and two second swing arms 9. The cleaning vibrating plate 4 is hinged to the main body of the thresher through the two first swing arms 8 and the two second swing arms 9. The two first swing arms 8 are symmetrically arranged left and right, and the two second swing arms 9 are symmetrically arranged left and right. The cleaning vibrating plate 4, the first swing arm 8, the second swing arm 9 and the main body of the thresher form a four-bar linkage mechanism.

[0007] Further, the connecting rod assembly further includes two third swing arms 10 and two fourth swing arms 11. The stepped plate 6 is hinged to the main body of the harvester through the two third swing arms 10 and the two fourth swing arms 11. The two third swing arms 10 are symmetrically arranged left and right, and the two fourth swing arms 11 are symmetrically arranged left and right. The stepped plate 6, the third swing arm 10, the fourth swing arm 11 and the main body of the harvester form a four-bar linkage mechanism.

[0008] Further, the reciprocating vibrating screen 7 includes an upper screen 71 located above a lower screen 72. The upper screen 71 is hinged to the main body of the harvester through the two fourth swing arms 11 and the two second swing arms 9. The upper screen 71, the fourth swing arm 11, the second swing arm 9 and the main body of the harvester form a four-bar linkage mechanism.

[0009] Further, the connecting rod assembly further includes two fifth swing arms 12. The lower screen 72 is hinged to the main body of the harvester through the two fourth swing arms 11 and the two fifth swing arms 12. The two fifth swing arms 12 are symmetrically arranged left and right. The lower screen 72, the fourth swing arm 11, the fifth swing arm 12 and the main body of the harvester form a four-bar linkage mechanism.

[0010] Further, the upper end of each first swing arm 8 is hinged to the main body of the harvester, and the lower end of each first swing arm 8 is hinged to the left / right side of the front end of the cleaning shaking plate 4. The middle part of each second swing arm 9 is hinged to the main body of the harvester, and the upper end of each second swing arm 9 is hinged to the left / right side of the rear end of the cleaning shaking plate 4.

[0011] Further, the lower end of each third swing arm 10 is hinged to the main body of the harvester, and the upper end of each third swing arm 10 is hinged to the left / right side of the front end of the stepped plate 6. The middle and lower part of each fourth swing arm 11 is hinged to the main body of the harvester, and the middle and upper part of each fourth swing arm 11 is hinged to the left / right side of the rear end of the stepped plate 6. The middle and upper part of each fourth swing arm 11 is hinged to the left / right side of the front end of the upper screen 71. The lower end of each second swing arm 9 is hinged to the left / right side of the rear end of the upper screen 71.

[0012] Further, the lower end of each fourth swing arm 11 is hinged to the left / right side of the front end of the lower screen 72. The upper end of each fifth swing arm 12 is hinged to the main body of the harvester, and the lower end of each fifth swing arm 12 is hinged to the left / right side of the rear end of the lower screen 72.

[0013] Further, the connecting rod assembly further includes two connecting rods 13 and two sixth swing arms 14. One end of each connecting rod 13 is hinged to the main body of the harvester, the other end of each connecting rod 13 is hinged to one end of a sixth swing arm 14, the other end of each sixth swing arm 14 is hinged to the upper end of a fourth swing arm 11, the two connecting rods 13 are symmetrically arranged left and right, and the two sixth swing arms 14 are symmetrically arranged left and right.

[0014] Further, the cleaning shaking plate 4 includes two side plates 41 and a plurality of flow guiding plates 42. The two side plates 41 are symmetrically arranged left and right, and a plurality of flow guiding plates 42 are connected between the two side plates 41; the plurality of flow guiding plates 42 together form a stepped structure that gradually rises from front to back; the plurality of flow guiding plates 42 are all inclined, and the rear end of any one flow guiding plate 42 is higher than its front end; the plurality of flow guiding plates 42 are arranged parallel to each other.

[0015] Due to the adoption of the above technologies, the positive effects of the present invention compared with the prior art are as follows:

[0016] (1) The present invention is provided with a primary cleaning fan, a cleaning shaking plate, a secondary cleaning fan, a stepped plate and a reciprocating vibrating screen. The primary cleaning fan is used to clean the materials between the axial flow cylinder and the cleaning shaking plate; the stepped plate is used to convey the materials threshed by the tangential flow cylinder and the materials from the cleaning shaking plate to the reciprocating vibrating screen; the secondary cleaning fan is used to clean the materials conveyed to the reciprocating vibrating screen. The present invention realizes the hierarchical separation of impurities through the synergistic action of multi-stage screening and air flow separation. The multi-stage cleaning system adopted by the present invention can quickly process materials, thereby improving the operation efficiency.

[0017] (2) The cleaning shaking plate of the present invention is provided with a plurality of inclined flow guiding plates, and these flow guiding plates together form a stepped structure that gradually rises from front to back. During the working process, the stepped structure can extend the conveying stroke of the materials, make the materials fully dispersed under the action of shaking and air flow, and thereby significantly improve the separation efficiency of the primary cleaning fan for impurities. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of a cleaning system for a harvester with multi-stage cleaning function of the present invention;

[0019] Figure 2 is a schematic diagram of the first limit position of the fourth swing arm of a harvester with multi-stage cleaning function of the present invention;

[0020] Figure 3 is a schematic diagram of the second limit position of the fourth swing arm of a harvester with multi-stage cleaning function of the present invention;

[0021] Figure 4It is a schematic structural diagram of a reciprocating vibrating screen with multi-stage cleaning function and a grain bottom shell of the present invention.

[0022] In the attached drawings: 1. Axial flow drum; 2. Tangential flow drum; 3. Primary cleaning fan; 4. Cleaning shaking plate; 41. Side plate; 42. Deflector plate; 5. Secondary cleaning fan; 6. Step plate; 7. Reciprocating vibrating screen; 71. Upper sieve; 711. Upper sieve side plate; 712. Upper sieve plate; 72. Lower sieve; 721. Lower sieve side plate; 722. Lower sieve plate; 723. First feeding plate; 724. Second feeding plate; 8. First swing arm; 9. Second swing arm; 10. Third swing arm; 11. Fourth swing arm; 12. Fifth swing arm; 13. Connecting rod; 14. Sixth swing arm; 15. Grain bottom shell; 151. Limit through hole; 16. First auger; 17. Second auger. Detailed implementation manners

[0023] The present invention will be further described below in conjunction with the attached drawings and specific embodiments, but it is not intended to limit the present invention.

[0024] Please refer to Figures 1 to 4 As shown, a harvester cleaning system with multi-stage cleaning function is shown. Among them, the harvester is provided with an axial flow drum 1 and a tangential flow drum 2. The tangential flow drum 2 cuts and disperses the harvested agglomerated crops to achieve the effect of preliminary threshing, and then conveys the crops to the axial flow drum 1 for further separation and threshing; the cleaning system includes: a primary cleaning fan 3, a cleaning shaking plate 4, a secondary cleaning fan 5, a step plate 6 and a reciprocating vibrating screen 7. The cleaning shaking plate 4 is located below the axial flow drum 1; the primary cleaning fan 3 is located in front of the cleaning shaking plate 4, and the air outlet of the primary cleaning fan 3 faces the front end of the cleaning shaking plate 4. The airflow generated during operation blows towards the cleaning shaking plate 4 for the first-stage cleaning of the materials; the step plate 6 is located below the tangential flow drum 2, and the reciprocating vibrating screen 7 is located behind the step plate 6; the step plate 6 is used to convey the materials threshed by the tangential flow drum 2 and the materials from the cleaning shaking plate 4 onto the reciprocating vibrating screen 7; the secondary cleaning fan 5 is located in front of the reciprocating vibrating screen 7, and the air outlet of the secondary cleaning fan 5 faces the front end of the reciprocating vibrating screen 7 for the second-stage cleaning of the materials; the cleaning shaking plate 4, the step plate 6 and the reciprocating vibrating screen 7 are linked by a connecting rod assembly, and the connecting rod assembly is connected to the power output source of the harvester; further, it also includes a driving mechanism and a grain bottom shell 15. The connecting rod assembly is connected to the power output source of the harvester through the driving mechanism; the grain bottom shell 15 is used to collect the cleaned materials and discharge the materials through the auger system provided inside it.

[0025] During operation, the materials discharged from the axial flow drum 1 continuously fall onto the cleaning shaking plate 4. The materials that fall on the cleaning shaking plate 4 undergo continuous bumpy movement and are conveyed forward. During this process, the airflow generated by the primary cleaning fan 3 acts on the materials between the axial flow drum 1 and the cleaning shaking plate 4, blowing the impurities to the rear of the cleaning shaking plate 4, thereby achieving the first-stage cleaning. The preliminarily cleaned materials fall from the front end of the cleaning shaking plate 4 into the tail of the stepped plate 6. At the same time, the materials discharged from the tangential flow drum 2 fall onto the stepped plate 6. Through the vibration of the stepped plate 6, the materials are conveyed backward while being stratified on the stepped plate 6. The heavier grains are in the lower layer, and the lighter impurities are in the upper layer. The stratified materials converge with the materials falling from the cleaning shaking plate 4 at the tail of the stepped plate 6 and then fall into the reciprocating vibrating screen 7 together. Then, the materials are vibrated and screened by the reciprocating vibrating screen 7. At the same time, the airflow generated by the secondary cleaning fan 5 performs the second-stage cleaning on the materials being screened, blowing the impurities to the rear of the compound vibrating screen 7. Finally, the materials that have undergone the second-stage cleaning fall into the grain bottom shell 15 and are then discharged through the auger system.

[0026] Further, in a preferred embodiment, the connecting rod assembly includes two first swing arms 8 and two second swing arms 9. The cleaning shaking plate 4 is hinged to the main body of the harvester through the two first swing arms 8 and the two second swing arms 9. The two first swing arms 8 are symmetrically arranged left and right, and the two second swing arms 9 are symmetrically arranged left and right. The cleaning shaking plate 4, the first swing arm 8, the second swing arm 9, and the main body of the harvester form a four-bar linkage mechanism.

[0027] Further, in a preferred embodiment, this four-bar linkage mechanism is the first four-bar linkage mechanism. The power input of the first four-bar linkage mechanism is at the lower ends of the two second swing arms 9. After applying power, the second swing arm 9 can rotate around its middle part, thereby driving the cleaning shaking plate 4 to swing back and forth.

[0028] Further, in a preferred embodiment, the connecting rod assembly further includes two third swing arms 10 and two fourth swing arms 11. The stepped plate 6 is hinged to the main body of the harvester through the two third swing arms 10 and the two fourth swing arms 11. The two third swing arms 10 are symmetrically arranged left and right, and the two fourth swing arms 11 are symmetrically arranged left and right. The stepped plate 6, the third swing arm 10, the fourth swing arm 11, and the main body of the harvester form a four-bar linkage mechanism.

[0029] Further, in a preferred embodiment, this four-bar linkage mechanism is the second four-bar linkage mechanism. The power input of the second four-bar linkage mechanism is at the upper ends of the two fourth swing arms 11. After applying power, the fourth swing arm 11 can rotate around its middle and lower part, thereby driving the stepped plate 6 to swing back and forth.

[0030] Furthermore, in a preferred embodiment, the reciprocating vibrating screen 7 includes an upper screen 71 and a lower screen 72, and the upper screen 71 is located above the lower screen 72; the upper screen 71 is hinged to the main body of the harvester through two fourth swing arms 11 and two second swing arms 9, and the upper screen 71, the fourth swing arm 11, the second swing arm 9 and the main body of the harvester form a four-bar linkage.

[0031] Furthermore, in a preferred embodiment, the four-bar linkage is a third four-bar linkage, and the power input of the third four-bar linkage is the upper ends of the two fourth swing arms 11. After power is applied, the fourth swing arms 11 can rotate around their lower parts, thereby driving the upper screen 71 to swing back and forth.

[0032] Furthermore, in a preferred embodiment, the connecting rod assembly also includes two fifth swing arms 12, the lower screen 72 and the main body of the harvester are hinged through two fourth swing arms 11 and two fifth swing arms 12, the two fifth swing arms 12 are symmetrically arranged on the left and right, and the lower screen 72, the fourth swing arm 11, the fifth swing arm 12 and the main body of the harvester form a four-bar linkage.

[0033] Furthermore, in a preferred embodiment, the four-bar linkage is a fourth four-bar linkage, and the power input of the fourth four-bar linkage is the upper ends of the two fourth swing arms 11. After power is applied, the fourth swing arms 11 can rotate around their lower parts, thereby driving the lower screen 72 to swing back and forth.

[0034] Furthermore, in a preferred embodiment, the upper end of each first swing arm 8 is hinged to the main body of the harvester, and the lower end of each first swing arm 8 is hinged to the left / right side of the front end of the cleaning and shaking plate 4; the middle part of each second swing arm 9 is hinged to the main body of the harvester, and the upper end of each second swing arm 9 is hinged to the left / right side of the rear end of the cleaning and shaking plate 4. When the second swing arm 9 is subjected to a force, the second swing arm 9 will rotate with the hinge point between the middle part and the harvester main body as the axis. As the second swing arm 9 rotates, its upper end will drive the cleaning and shaking plate 4 to move. At the same time, the movement of the cleaning and shaking plate 4 will link the two first swing arms 8, so that the first swing arm 8 will rotate with the hinge point between its upper end and the harvester main body as the axis. Through such a series of linkages, the reciprocating motion of the cleaning and shaking plate 4 is finally achieved.

[0035] Further, in a preferred embodiment, the lower end of each third swing arm 10 is hinged to the main body of the harvester, and the upper end of each third swing arm 10 is hinged to the left / right side of the front end of the step plate 6; the middle-lower part of each fourth swing arm 11 is hinged to the main body of the harvester, and the middle-upper part of each fourth swing arm 11 is hinged to the left / right side of the rear end of the step plate 6; the middle-upper part of each fourth swing arm 11 is hinged to the left / right side of the front end of the upper sieve 71; the lower end of each second swing arm 9 is hinged to the left / right side of the rear end of the upper sieve 71. When the fourth swing arm 11 is subjected to a force, the fourth swing arm 11 will rotate about the hinge point of its middle-lower part and the main body of the harvester as the axis. As the fourth swing arm 11 rotates, its middle-upper part will drive the step plate 6 to move. At the same time, the movement of the step plate 6 will link two third swing arms 10, causing the third swing arms 10 to rotate about the hinge point of their lower ends and the main body of the harvester as the axis. Through such a series of linkages, the reciprocating movement of the step plate 6 is finally realized.

[0036] Further, in a preferred embodiment, the rear end of the step plate 6, the middle-upper part of the fourth swing arm 11 and the front end of the upper sieve 71 are hinged by a connecting shaft. As the fourth swing arm 11 rotates, its middle-upper part will also drive the upper sieve 71 to move. At the same time, the movement of the upper sieve 71 will link two second swing arms 9, causing the second swing arms 9 to rotate about the hinge point of their middle parts and the main body of the harvester as the axis. Through such a series of linkages, the reciprocating movement of the upper sieve 71 is finally realized. In addition, the linkage of the second swing arm 9 provides power for the first four-bar linkage.

[0037] Further, in a preferred embodiment, the lower end of each fourth swing arm 11 is hinged to the left / right side of the front end of the lower sieve 72; the upper end of each fifth swing arm 12 is hinged to the main body of the harvester, and the lower end of each fifth swing arm 12 is hinged to the left / right side of the rear end of the lower sieve 72. When the fourth swing arm 11 is subjected to a force, the fourth swing arm 11 will rotate about the hinge point of its middle-lower part and the main body of the harvester as the axis. As the fourth swing arm 11 rotates, its lower end will drive the lower sieve 72 to move. At the same time, the movement of the lower sieve 72 will link two fifth swing arms 12, causing the fifth swing arms 12 to rotate about the hinge point of their upper ends and the main body of the harvester as the axis. Through such a series of linkages, the reciprocating movement of the lower sieve 72 is finally realized.

[0038] Further, in a preferred embodiment, a limit through hole 151 is provided on each of the two side walls of the grain bottom shell 15, and the two limit through holes 151 are symmetrically arranged left and right. The connecting shaft at the lower end of each fourth swing arm 11 penetrates into a limit through hole 151, and the limit through hole 151 can limit the swing distance of the fourth swing arm 11.

[0039] Further, in a preferred embodiment, the upper end of each first swing arm 8 is hinged to the main body of the harvester, and the axis position of each hinge is fixed; the lower end of each first swing arm 8 is hinged to the left / right side of the front end of the cleaning shaking plate 4; the middle part of each second swing arm 9 is hinged to the main body of the harvester, and the axis position of each hinge is fixed; the upper end of each second swing arm 9 is hinged to the left / right side of the rear end of the cleaning shaking plate 4; the lower end of each second swing arm 9 is hinged to the left / right side of the rear end of the upper sieve 71; the upper middle part of each fourth swing arm 11 is hinged to the left / right side of the front end of the upper sieve 71; the upper middle part of each fourth swing arm 11 is hinged to the left / right side of the rear end of the stepped plate 6; the lower end of each third swing arm 10 is hinged to the main body of the harvester, and the axis position of each hinge is fixed; the upper end of each third swing arm 10 is hinged to the left / right side of the front end of the stepped plate 6; the lower end of each fourth swing arm 11 is hinged to the left / right side of the front end of the lower sieve 72; the upper end of each fifth swing arm 12 is hinged to the main body of the harvester, and the axis position of each hinge is fixed; the lower end of each fifth swing arm 12 is hinged to the left / right side of the rear end of the lower sieve 72; thus, it can be seen that the cleaning shaking plate 4, the stepped plate 6, the upper sieve 71 and the lower sieve 72 are linked by the connecting rod assembly. The cleaning shaking plate 4 and the upper sieve 71 are linked by the second swing arm 9; the upper sieve 71 and the stepped plate 6 are linked by the fourth swing arm 11, and the axis of the hinge point between the upper sieve 71 and the fourth swing arm 11 coincides with the axis of the hinge point between the stepped plate 6 and the fourth swing arm 11; the upper sieve 71 and the lower sieve 72 are linked by the fourth swing arm 11. In addition, the hinge point of the fourth swing arm 11 with the main body of the harvester is located between its hinge points with the upper sieve 71 and the lower sieve 72. When the fourth swing arm 11 rotates, it will drive the upper sieve 71 and the lower sieve 72 to move in opposite directions.

[0040] Further, in a preferred embodiment, the connecting rod assembly further includes two connecting rods 13 and two sixth swing arms 14. One end of each connecting rod 13 is hinged to the main body of the harvester, and the other end of each connecting rod 13 is hinged to one end of a sixth swing arm 14. The connecting rod 13 can limit the stroke of the sixth swing arm 14; the other end of each sixth swing arm 14 is hinged to the upper end of a fourth swing arm 11. The two connecting rods 13 are symmetrically arranged left and right, and the two sixth swing arms 14 are symmetrically arranged left and right.

[0041] Further, in a preferred embodiment, the driving mechanism is connected to the other end of the connecting rod 13; when the driving mechanism applies power to the other end of the connecting rod 13, the connecting rod 13 can rotate around its hinge point with the main body of the harvester, and this rotational movement drives the fourth swing arm 11 to swing through the sixth swing arm 14; as the fourth swing arm 11 rotates, the upper middle part thereof drives the stepped plate 6 and the upper sieve 71 to move; at the same time, the movement of the upper sieve 71 drives two second swing arms 9 to rotate around the hinge point of the middle part of the second swing arms 9 with the main body of the harvester; as the second swing arms 9 rotate, the upper ends thereof drive the cleaning shaking plate 4 to move; in addition, as the fourth swing arm 11 rotates, the lower end thereof drives the lower sieve 72 to move. It can be seen that when power is applied to the connecting rod 13, the cleaning shaking plate 4, the stepped plate 6, the upper sieve 71 and the lower sieve 72 can be driven to perform reciprocating movements through the link assembly. This is a preferred embodiment, but is not limited to the connection position of the driving mechanism. Connecting the driving mechanism to other swing arms can also achieve the linkage of the link assembly.

[0042] Further, in a preferred embodiment, the cleaning shaking plate 4 includes two side plates 41 and a plurality of guide plates 42. The two side plates 41 are symmetrically arranged left and right. A plurality of guide plates 42 are connected between the two side plates 41. The two side plates 41 play a role in connecting the plurality of guide plates 42, and the two side plates 41 can reduce the discharge of materials from both sides; the plurality of guide plates 42 together form a stepped structure that gradually rises from front to back; the plurality of guide plates 42 are all inclined, and the rear end of any one guide plate 42 is higher than its front end; the angle between the guide plate 42 and the horizontal plane is an acute angle. The inclined guide plates 42 facilitate the forward flow of materials under the action of gravity; the plurality of guide plates 42 are arranged parallel to each other, making the transmission speed of materials more uniform. The cleaning shaking plate 4 is provided with a plurality of inclined guide plates 42, and these guide plates 42 together form a stepped structure that gradually rises from front to back. During the working process, the stepped structure can extend the conveying stroke of the materials, enabling the materials to be fully dispersed under the action of shaking and air flow, thereby significantly improving the cleaning efficiency of the primary cleaning fan 3 for the materials.

[0043] Further, in a preferred embodiment, the lower ends of the two first swing arms 8 are respectively connected to the two side plates 41; the upper ends of the two second swing arms 9 are respectively connected to the two side plates 41.

[0044] Further, in a preferred embodiment, the rear end of the guide plate 42 extends below the front end of the adjacent guide plate 42 behind it. This structural design ensures that the materials can smoothly slide from the current guide plate 42 onto the adjacent guide plate 42 in front of it, realizing the continuous conveying process of the materials.

[0045] Further, in a preferred embodiment, an air outlet channel is provided between any two adjacent guide plates 42. When the primary cleaning fan 3 is working, impurities can be discharged from the air outlet channel.

[0046] Further, in a preferred embodiment, a plurality of diversion grooves are provided on the deflector 42 at uniformly spaced intervals in the left-right direction. The plurality of diversion grooves provided make the material falling on the deflector 42 more evenly distributed, preventing local accumulation of the material and making the transmission smoother.

[0047] Further, in a preferred embodiment, the upper sieve 71 includes two upper sieve side plates 711 and an upper sieve plate 712. The left and right ends of the upper sieve plate 712 are respectively connected to the two upper sieve side plates 711, and the two upper sieve side plates 711 are symmetrically arranged left and right; the lower ends of the two second swing arms 9 are respectively connected to the two upper sieve side plates 711, and the middle upper parts of the two fourth swing arms 11 are respectively connected to the two upper sieve side plates 711.

[0048] Further, in a preferred embodiment, the lower sieve 72 includes two lower sieve side plates 721, a lower sieve plate 722, a first feeding plate 723 and a second feeding plate 724. A lower sieve plate 722, a first feeding plate 723 and a second feeding plate 724 are connected between the two lower sieve side plates 721, and the two lower sieve side plates 721 are symmetrically arranged left and right; the lower ends of the two fourth swing arms 11 are respectively connected to the two lower sieve side plates 721, and the lower ends of the two fifth swing arms 12 are respectively connected to the two lower sieve side plates 721; the first feeding plate 723 is located below the lower sieve plate 722, and the material filtered by the lower sieve plate 722 falls onto the first feeding plate 723; the second feeding plate 724 is located below the first feeding plate 723, and under the blowing action of the secondary cleaning fan 5, the impurities fall from the rear end of the first feeding plate 723 onto the second feeding plate 724.

[0049] Further, in a preferred embodiment, the auger system includes a first auger 16 and a second auger 17. The first auger 16 is located at the lower end of the first feeding plate 723, and the second auger 17 is located at the lower end of the second feeding plate 724; the grains on the first feeding plate 723 are discharged through the first auger 16, and the impurities on the second feeding plate 724 are discharged through the second auger 17.

[0050] Working process:

[0051] The material threshed by the axial flow cylinder 1 falls onto the cleaning vibrating plate 4. Through the vibration of the cleaning vibrating plate 4, the material is conveyed forward. During the conveying process, two free falls of the material are formed. By cooperating with the primary cleaning fan 3, the impurities are separated. The material after primary cleaning falls into the tail of the stepped plate 6 at the front end of the cleaning vibrating plate 4. At the same time, the material threshed by the tangential flow cylinder 2 falls onto the stepped plate 6. Through the vibration of the stepped plate 6, the material is conveyed backward while being stratified on the stepped plate 6. The heavier grains are in the lower layer and the lighter impurities are in the upper layer. After the material is stratified, it is more conducive to cleaning. At the tail of the stepped plate 6, the material conveyed from the tangential flow cylinder 2 converges with the material falling from the cleaning vibrating plate 4, and then they fall into the reciprocating vibrating screen 7 together. The converged material falls onto the screen surface of the upper screen 71 of the reciprocating vibrating screen 7 at the tail of the stepped plate 6. The grains and a small amount of fine debris pass through the upper screen 71 and then fall onto the screen surface of the lower screen 72. Finally, the grains pass through the lower screen 72 and fall into the grain bottom shell 15. During the falling process, by cooperating with the secondary cleaning fan 5, the impurities are separated to obtain clean grains.

[0052] In the present invention, the primary cleaning fan 3: performs the primary cleaning on the threshed material, adjusts the magnitude of the wind speed and the angle of the wind direction, and can separate about 50% of the impurities; the cleaning vibrating plate 4: conveys the material threshed by the axial flow cylinder 1 forward. During the conveying, two free falls of the material are formed. By cooperating with the primary cleaning fan 3, the impurities are separated. The material after primary cleaning falls into the tail of the stepped plate 6 at the front end of the cleaning vibrating plate 4 and converges with the material conveyed by the stepped plate 6; the secondary cleaning fan 5: performs the secondary cleaning on the threshed material, adjusts the magnitude of the wind speed and the angle of the wind direction, and can separate the remaining impurities. The grain cleaning rate can reach more than 99%; the stepped plate 6: conveys the material threshed by the tangential flow cylinder 2 backward. After converging with the material conveyed by the cleaning vibrating plate 4 at the tail of the stepped plate 6, they fall into the reciprocating vibrating screen 7 together; the reciprocating vibrating screen 7: the falling material first falls onto the screen surface of the upper screen 71. The grains and a small amount of fine debris pass through the upper screen 71 and then fall onto the screen surface of the lower screen 72. Finally, the grains pass through the lower screen 72 and fall into the grain bottom shell 15. During the falling process, by cooperating with the secondary cleaning fan 5, the impurities are separated to obtain clean grains.

[0053] The present invention relates to a cleaning system with multi-stage cleaning functions applied to a combine harvester, which is used for pre-treating the mixed materials after threshing, separating impurities such as straw, broken leaves, and dust, and obtaining clean grains. It is applicable to grain combine harvesters for wheat, soybeans, corn, rice, etc. Especially in high-yield fields, humid environments or plots with more weeds, it can significantly improve the cleaning quality and operation efficiency. Through the synergistic effect of multi-stage screening and air flow separation, the present invention realizes the hierarchical separation of impurities, and the grain cleaning rate can reach more than 99%. Through the multi-stage cleaning system, the present invention can quickly process more materials and improve the operation efficiency by more than 20%.

[0054] The above are only the preferred embodiments of the present invention, and do not limit the implementation modes and protection scope of the present invention. For those skilled in the art, it should be realized that all the equivalent replacements and obvious changes made by using the description and illustration content of the present invention should be included in the protection scope of the present invention.

Claims

1. A cleaning system for a harvester with multi-stage cleaning function. The harvester is provided with an axial flow cylinder (1) and a tangential flow cylinder (2), and is characterized in that: The cleaning system includes a primary cleaning fan (3), a cleaning vibrating plate (4), a secondary cleaning fan (5), a stepped plate (6), and a reciprocating vibrating screen (7). The cleaning vibrating plate (4) is located below the axial flow cylinder (1); the primary cleaning fan (3) is located in front of the cleaning vibrating plate (4) and is used for the first-stage cleaning of the material; the stepped plate (6) is located below the tangential flow cylinder (2), and the reciprocating vibrating screen (7) is located behind the stepped plate (6); the stepped plate (6) is used to convey the material threshed by the tangential flow cylinder (2) and the material from the cleaning vibrating plate (4) to the reciprocating vibrating screen (7); the secondary cleaning fan (5) is located in front of the reciprocating vibrating screen (7) and is used for the second-stage cleaning of the material; the cleaning vibrating plate (4), the stepped plate (6), and the reciprocating vibrating screen (7) are linked by a connecting rod assembly.

2. The threshing and cleaning system of a combine harvester with a multi-stage cleaning function according to claim 1, characterized in that: The connecting rod assembly includes two first swing arms (8) and two second swing arms (9). The cleaning vibrating plate (4) is hinged to the main body of the harvester through the two first swing arms (8) and the two second swing arms (9). The two first swing arms (8) are symmetrically arranged left and right, and the two second swing arms (9) are symmetrically arranged left and right. The cleaning vibrating plate (4), the first swing arm (8), the second swing arm (9), and the main body of the harvester form a four-bar linkage.

3. The threshing and cleaning system of the harvester with multi-stage cleaning function according to claim 2, characterized in that: The connecting rod assembly further includes two third swing arms (10) and two fourth swing arms (11). The stepped plate (6) is hinged to the main body of the harvester through the two third swing arms (10) and the two fourth swing arms (11). The two third swing arms (10) are symmetrically arranged left and right, and the two fourth swing arms (11) are symmetrically arranged left and right. The stepped plate (6), the third swing arm (10), the fourth swing arm (11), and the main body of the harvester form a four-bar linkage.

4. The threshing and winnowing system of a harvester with multi-stage winnowing function according to claim 3, characterized in that: The reciprocating vibrating screen (7) includes an upper screen (71) and a lower screen (72). The upper screen (71) is located above the lower screen (72); the upper screen (71) is hinged to the main body of the harvester through the two fourth swing arms (11) and the two second swing arms (9). The upper screen (71), the fourth swing arm (11), the second swing arm (9), and the main body of the harvester form a four-bar linkage.

5. The threshing and winnowing system of a harvester with a multi-stage winnowing function according to claim 4, characterized in that: The connecting rod assembly further includes two fifth swing arms (12). The lower screen (72) is hinged to the main body of the harvester through the two fourth swing arms (11) and the two fifth swing arms (12). The two fifth swing arms (12) are symmetrically arranged left and right. The lower screen (72), the fourth swing arm (11), the fifth swing arm (12), and the main body of the harvester form a four-bar linkage.

6. The threshing and winnowing system of a harvester with a multi-stage winnowing function according to claim 5, wherein: The upper end of each first swing arm (8) is hinged to the main body of the harvester, and the lower end of each first swing arm (8) is hinged to the left / right side of the front end of the cleaning vibrating plate (4); the middle of each second swing arm (9) is hinged to the main body of the harvester, and the upper end of each second swing arm (9) is hinged to the left / right side of the rear end of the cleaning vibrating plate (4).

7. The threshing and winnowing system of a harvester with a multi-stage winnowing function according to claim 6, characterized in that: The lower end of each third swing arm (10) is hinged to the main body of the harvester, and the upper end of each third swing arm (10) is hinged to the left / right side of the front end of the stepped plate (6); the middle and lower part of each fourth swing arm (11) is hinged to the main body of the harvester, and the middle and upper part of each fourth swing arm (11) is hinged to the left / right side of the rear end of the stepped plate (6); the middle and upper part of each fourth swing arm (11) is hinged to the left / right side of the front end of the upper sieve (71); the lower end of each second swing arm (9) is hinged to the left / right side of the rear end of the upper sieve (71).

8. The threshing and cleaning system of a harvester with a multi-stage cleaning function according to claim 7, characterized in that: The lower end of each fourth swing arm (11) is hinged to the left / right side of the front end of the lower sieve (72); the upper end of each fifth swing arm (12) is hinged to the main body of the harvester, and the lower end of each fifth swing arm (12) is hinged to the left / right side of the rear end of the lower sieve (72).

9. The threshing and winnowing system of a harvester with a multi-stage winnowing function according to claim 5 or 8, characterized in that: The link assembly further includes two connecting rods (13) and two sixth swing arms (14). One end of each connecting rod (13) is hinged to the main body of the harvester, and the other end of each connecting rod (13) is hinged to one end of a sixth swing arm (14). The other end of each sixth swing arm (14) is hinged to the upper end of a fourth swing arm (11). The two connecting rods (13) are symmetrically arranged left and right, and the two sixth swing arms (14) are symmetrically arranged left and right.

10. The threshing and cleaning system of a harvester with a multi-stage cleaning function according to claim 1, wherein: The cleaning shaking plate (4) includes two side plates (41) and a plurality of flow guide plates (42). The two side plates (41) are symmetrically arranged left and right, and a plurality of flow guide plates (42) are connected between the two side plates (41); the plurality of flow guide plates (42) together form a stepped structure that gradually rises from front to back; the plurality of flow guide plates (42) are all inclined, and the rear end of any one flow guide plate (42) is higher than its front end; The plurality of flow guide plates (42) are arranged parallel to each other.

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