CN221010904U - Cleaning system and combine harvester - Google Patents

Abstract

The utility model provides a cleaning system and a combine harvester, and relates to the technical field of combine harvesters. The utility model improves the cleaning efficiency and the cleaning quality.

Description

Cleaning system and combine harvester

Technical Field

The utility model relates to the technical field of combine harvesters, in particular to a cleaning system and a combine harvester.

Background

The cleaning system is an important working part of the combine harvester, and the performance of the cleaning system directly influences the working quality and efficiency of the whole combine harvester.

Separating falling threshed objects (including seeds, heads, stems, glumes, grass scraps, light impurities and the like) from a threshing device, dropping the threshed objects to a vibrating screen, continuously throwing, layering and moving backwards through a corrugated plate, a scale screen, a tail screen and the like, blowing out the stems, grass scraps, impurities and the like in the threshed objects by air flow blown out by a front-end fan, and finally screening to obtain clean seeds after the seeds passing through a woven screen below the scale screen, and conveying the clean seeds to a granary through a seed auger; part of the heads, stems and the like enter the surplus auger and are conveyed, thrown and returned to the screen surface of the vibrating screen for secondary screening. During harvesting, people adapt to different crops and environments by adjusting the air inlet of a fan, the opening degree of a scale sieve sheet in a vibrating sieve and the like according to experience, and the cleaning operation performance is ensured. In the related art, the bottom of a fan in the cleaning system is provided with an air outlet, and the fan blows air flow from bottom to top to the vibrating screen through the air outlet at the lower part, so that crops are cleaned.

Aiming at the related technology, for the working conditions of high water content, more impurities and large feeding quantity, the air flow blown out through the air outlet at the bottom of the fan has insufficient capability of blowing and supporting the separated matters, so that the cleaning efficiency is low and the quality is poor.

Disclosure of utility model

The utility model aims to provide a cleaning system which improves cleaning efficiency and cleaning quality.

In order to achieve the aim of the utility model, the utility model adopts the technical scheme that: the utility model provides a cleaning system, includes the cleaning frame, be provided with fan, shale shaker, seed auger and miscellaneous surplus auger on the cleaning frame, be provided with the spiral case on the cleaning frame, the fan is located in the spiral case, the spiral case top forms the last air outlet, the below of spiral case forms down the air outlet, be provided with corrugated plate, preceding pointer sieve, back pointer sieve, well ripple board, a plurality of scale sieves and braiding sieve on the shale shaker, it is close to go up the buckled plate the setting of cleaning frame top, preceding pointer sieve with go up the buckled plate is kept away from the one end butt setting of fan, back pointer sieve is located preceding pointer sieve is kept away from one end of going up the buckled plate, well ripple board interval sets up go up the buckled plate below, it is towards to go up the opening of air outlet the bottom of preceding pointer sieve, a plurality of scale sieves are in on the cleaning frame, a plurality of scale sieves are located in the one end that well ripple board is kept away from the fan, a plurality of scale sieves are kept away from in proper order the one end of fan is kept away from the mesh, a plurality of scale sieves are located down the impeller is set up towards the auger is located down.

The utility model is used in practice: the air flow can be blown out through last air outlet and lower air outlet by the fan, and the air flow that the fan blown out acts on pointer sieve, well ripple board, scale sieve and woven screen, and upper pointer sieve carries out the prescreen to deviate from the thing, and the middle level scale sieve carries out the coarse screening to deviate from the thing, and the woven screen of lower floor carries out the fine screening to deviate from the thing, realizes three-layer screening, and clean seed falls into in the seed auger and carries to the grain tank of harvester, and the air flow that the fan blown out through lower air outlet blows miscellaneous surplus to miscellaneous auger department, carries out secondary cleaning. Through setting up two air outlets, improved the air current blown out of fan and blown the ability of holding in the palm the deviating from the thing, and the three-layer cleaning sieve that cooperation pointer sieve, scale sieve and woven screen constitute has improved cleaning efficiency and cleaning quality.

Further, the height of the fish scale sieve close to one end of the fan is lower than the height of the fish scale sieve away from one end of the fan, and an adjusting plate for adjusting the opening degree of the fish scale sieve is arranged on the fish scale sieve.

Further, an upper air guide plate and a lower air guide plate are arranged on the cleaning machine frame, the upper air guide plate and the lower air guide plate are close to the lower air outlet, the upper air guide plate is located above the lower air guide plate, a first lower air channel is formed between the upper air guide plate and the volute, the opening of the first lower air channel faces to the gap between the fish scale sieve and the woven sieve, a second lower air channel is formed between the upper air guide plate and the lower air guide plate, the opening of the second lower air channel faces to the gap between the woven sieve and the grain auger, a third lower air channel is formed below the lower air guide plate, and the third lower air channel faces to the impurity auger.

Further, the height that goes up the buckled plate and is close to fan one end is less than and keeps away from the height of fan one end, well ripple board is close to the height that fan one end is less than and keeps away from the height of fan one end, preceding pointer sieve is close to go up the height that the buckled plate one end is less than and keeps away from go up the height of buckled plate one end, back pointer sieve is close to the height that preceding pointer sieve one end is less than and keeps away from preceding pointer sieve one end.

Further, the fan comprises a rotating shaft, a supporting frame, a plurality of blades, an outer mounting seat and an inner mounting seat, wherein two ends of the outer mounting seat are respectively connected with the cleaning machine frame, two ends of the inner mounting seat are respectively connected with the cleaning machine frame, two ends of the rotating shaft are respectively connected with the outer mounting seat and the inner mounting seat in a rotating mode, the supporting frame is connected with the rotating shaft, and a plurality of blades are uniformly distributed and connected to the supporting frame.

Further, one end of the woven screen close to the lower air outlet is provided with a guide plate.

Further, the vibrating screen mountain is fixed with a driving shaft, two ends of the driving shaft are respectively and eccentrically connected with eccentric shafts, the two eccentric shafts are rotatably installed on the cleaning machine frame, the two eccentric shafts are respectively and fixedly connected with a driving wheel and a driven wheel, and balancing weights are respectively arranged on the driving wheel and the driven wheel.

Further, the seed auger comprises a first horizontal auger, a seed elbow, a seed lifting auger and a seed lifting cylinder, wherein the first horizontal auger is arranged on the cleaning machine frame, the lower end of the seed elbow is connected with the first horizontal auger, the seed lifting cylinder is connected with the top end of the seed elbow, and the seed lifting auger is arranged inside the seed lifting cylinder;

The impurity auger comprises a second horizontal auger, a secondary threshing chamber, a lifting grain auger and a lifting shell, wherein the second horizontal auger is arranged on the cleaning machine frame, the second horizontal auger is positioned on one side, far away from the fan, of the first horizontal auger, the secondary threshing chamber is connected with the discharge end of the second horizontal auger, the lifting shell is connected with the lifting shell, the lifting grain auger is arranged inside the lifting shell, a secondary threshing toothed plate is arranged at the end part of the second horizontal auger, the secondary threshing toothed plate is positioned in the secondary threshing chamber, and a secondary threshing fixed cover is arranged in the secondary threshing chamber.

Further, one end of the scale sieve, which is far away from the medium corrugated board, is provided with a fixed tail sieve, and one end of the fixed tail sieve, which is far away from the scale sieve, is provided with an elastic tail sieve.

The utility model also provides a combine harvester, which comprises the cleaning system.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, the volute is arranged to form the upper air outlet and the lower air outlet, so that the capability of blowing and supporting the separated matters by the air flow blown by the fan is improved, and the cleaning efficiency is improved.

2. According to the utility model, the three layers of the cleaning screens consisting of the pointer screen, the fish scale screen and the woven screen are arranged, and the cleaning efficiency and the cleaning quality are improved by matching with the air flow blown out by the fan. Due to the arrangement of the plurality of fish scales, each fish scale can independently adjust the opening of the corresponding sieve plate, so that the states of materials entering the seed auger and the impurity auger are respectively controlled, clean seeds are obtained, and cleaning loss caused by reduction of the opening of the fish scale is avoided.

3. According to the utility model, the guide plates are arranged, and can control the airflow distribution in front of and behind the vibrating screen, so that the functions of rapid penetration of seeds and rapid discharge of impurities under different working conditions are realized.

4. The utility model can realize the functions of secondary threshing, grain lifting and secondary cleaning by arranging the miscellaneous auger, and the stalks, the heads and the like entering the miscellaneous auger are subjected to secondary threshing and converted into grains and small miscellaneous residues, the grains and the miscellaneous residues after secondary threshing are lifted and sprayed by the miscellaneous residue lifting auger and returned to the screen surface of the vibrating screen for secondary cleaning under the action of air flow at an air outlet, and the grains and the miscellaneous residues after secondary threshing are quickly filtered and the small miscellaneous residues are quickly discharged.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model.

Fig. 1 is a schematic diagram of a cleaning system according to an embodiment of the utility model.

Fig. 2 is a schematic view of a cleaning frame structure according to an embodiment of the present utility model.

Fig. 3 is a schematic view of a vibrating screen structure according to an embodiment of the present utility model.

FIG. 4 is a schematic view of the mating relationship of an adjusting plate and a fish scale screen according to an embodiment of the present utility model.

Fig. 5 is a schematic view of a fan structure according to an embodiment of the present utility model.

Fig. 6 is a schematic view of a driving shaft structure of a vibrating screen according to an embodiment of the present utility model.

Fig. 7 is a schematic view of a grain auger structure according to an embodiment of the present utility model.

FIG. 8 is a schematic diagram of a structure of a surplus auger according to an embodiment of the utility model.

Fig. 9 is a schematic view of a secondary threshing toothed plate structure according to an embodiment of the utility model.

Fig. 10 is a schematic view of a secondary threshing fixing cover structure according to an embodiment of the utility model.

Wherein, the reference numerals are as follows: 1. a cleaning machine frame; 2. a blower; 201. a rotating shaft; 202. a support frame; 203. a blade; 204. an outer mounting base; 205. an inner mounting base; 3. a vibrating screen; 4. a seed auger; 41. a first horizontal auger; 42. a seed elbow; 43. a seed lifting auger; 44. a seed lifting cylinder; 5. a miscellaneous auger; 51. a second horizontal auger; 52. a secondary threshing chamber; 53. lifting a Yanggu auger; 54. lifting the housing; 6. a volute; 7. an upper air outlet; 8. a lower air outlet; 9. a corrugated plate is arranged; 10. a front pointer screen; 11. a rear pointer screen; 12. a medium corrugated board; 13. a fish scale sieve; 14. weaving a screen; 15. fixing a tail screen; 16. an elastic tail screen; 17. an upper air deflector; 18. a lower air deflector; 19. a first lower air duct; 20. a second lower air duct; 21. a third lower air duct; 22. a deflector; 23. a drive shaft; 24. an eccentric shaft; 25. a driving wheel; 26. driven wheel; 27. balancing weight; 28. a secondary threshing toothed plate; 29. a secondary threshing fixed cover; 30. an adjusting plate; 31. a first guide plate; 32. and a second material guiding plate.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. Of course, the specific embodiments described herein are for purposes of illustration only and are not intended to limit the utility model.

Referring to fig. 1 to 3, a cleaning system comprises a cleaning frame 1, a blower 2, a vibrating screen 3, a seed auger 4 and a impurity auger 5 are mounted on the cleaning frame 1, a volute 6 is arranged on the cleaning frame 1, the blower 2 is located in the volute 6, an upper air outlet 7 is formed above the volute 6, a lower air outlet 8 is formed below the volute 6, an upper corrugated plate 9, a front pointer screen 10, a rear pointer screen 11, a middle corrugated plate 12, two corrugated plates 13 and a woven screen 14 are arranged on the vibrating screen 3, the upper corrugated plate 9 is arranged above the cleaning frame 1, the front pointer screen 10 and one end of the upper corrugated plate 9, far from the blower 2, are arranged in an abutting mode, the rear pointer screen 11 is arranged at one end, far from the front pointer screen 10, far from the upper corrugated plate 9, the middle corrugated plate 12 is arranged below the upper corrugated plate 9 at intervals, an opening of the upper air outlet 7 faces the bottom of the front pointer screen 10, the two corrugated plates 13 are arranged on the cleaning frame 1, the two corrugated plates 13 are located at one end, far from the middle corrugated plate 12, and the two corrugated plates 13 are sequentially arranged in an abutting mode, and the two corrugated plates 13 are sequentially arranged at the front end, far from the rear end, respectively.

Referring to fig. 3 and 4, an adjusting plate 30 for adjusting the opening of the screen 13 is mounted on the screen 13, a pin shaft on the adjusting plate 30 penetrates through a pin hole of one of the screen 13 sheets, the screen 13 sheet is driven to rotate by rotating the adjusting plate 30, the screen 13 sheets are connected through mounting brackets on two sides, an upper bracket is fixed, and a lower bracket swings along with the rotation of the screen 13 sheet. The staff can adjust the opening of the sieve sheet of the fish scale sieve 13 through the observation hole on the cleaning frame 1, and the manner of adjusting the opening of the fish scale sieve 13 by the adjusting plate 30 is well known to the person skilled in the art, and will not be described in detail here. The woven screen 14 is positioned below the fish scale screen 13, and the opening of the lower air outlet 8 is arranged towards the woven screen 14 and the seed auger 4. The end of the fish scale sieve 13, which is far away from the middle corrugated board 12, is provided with a fixed tail sieve 15, and the end of the fixed tail sieve 15, which is far away from the fish scale sieve 13, is provided with an elastic tail sieve 16.

It is to be added that the fixed tail screen 15 and the elastic tail screen 16 are comb-shaped structures, two ends of the fixed tail screen 15 are welded on two side plates of the frame of the vibrating screen 3, the whole strength and rigidity are improved through connection, and meanwhile, the separated objects on the vibrating screen 3 are transited from the fish scale screen 13 to the elastic tail screen 16. The elastic tail screen 16 is assembled on two side plates of the vibrating screen 3 through the mounting bracket, and is made of materials with high elasticity, so that the vibration amplitude in the vibration process is relatively large, and grains mixed in the miscellaneous straws can vibrate and then can be easily permeated.

With reference to fig. 1 and 3, it should be added that the upper corrugated plate 9, the front pointer screen 10, the rear pointer screen 11, the middle corrugated plate 12, the two scale screens 13 and the woven screen 14 are all in a step rising shape, that is, the heights of the ends of the upper corrugated plate 9, the front pointer screen 10, the rear pointer screen 11, the middle corrugated plate 12, the two scale screens 13 and the woven screen 14, which are close to the motor, are lower than the heights of the ends, which are far away from the motor.

Referring to fig. 1 and 2, an upper air deflector 17 and a lower air deflector 18 are mounted on the cleaning machine frame 1, the upper air deflector 17 and the lower air deflector 18 are arranged close to the lower air outlet 8, the upper air deflector 17 is located above the lower air deflector 18, a first lower air duct 19 is formed between the upper air deflector 17 and the volute 6, an opening of the first lower air duct 19 faces to a gap between the fish scale sieve 13 and the woven sieve 14, a second lower air duct 20 is formed between the upper air deflector 17 and the lower air deflector 18, an opening of the second lower air duct 20 faces to a gap between the woven sieve 14 and the seed auger 4, a third lower air duct 21 is formed below the lower air deflector 18, and the third lower air duct 21 faces to the surplus auger 5. The upper air deflector 17 and the lower air deflector 18 are arranged to guide the air flow blown out by the fan 2, so that the working state of the cleaning system can be controlled conveniently.

When in actual use, the air flow can be blown out through the upper air outlet 7 and the lower air outlet 8 by the fan 2, the air flow blown out by the fan 2 acts on the pointer sieve, the middle corrugated plate 12, the scale sieve 13 and the woven sieve 14, the pointer sieve at the upper layer performs pre-screening on the separated matters, the scale sieve 13 at the middle layer performs coarse screening on the separated matters, the woven sieve 14 at the lower layer performs fine screening on the separated matters, three-layer screening is realized, clean seeds fall into the seed auger 4 and are conveyed into a grain tank of the harvester, and the air flow blown out by the fan 2 through the lower air outlet 8 blows the impurity to the position of the impurity auger 5 for secondary cleaning. Through setting up two air outlets, improved the air current blown out by fan 2 and blown out the ability of holding in the palm the deviate from the thing, and the three-layer cleaning sieve that cooperation pointer sieve, scale sieve 13 and woven screen 14 constitute has improved cleaning efficiency and cleaning quality.

It should be noted that, the upper corrugated plate 9 and the middle corrugated plate 12 are mainly used for uniformly spreading the separated objects above the upper corrugated plate by vibration and pushing the separated objects backwards, so that the uniformly spread separated objects are beneficial to the subsequent screening.

The front pointer screen 10 and the rear pointer screen 11 are similar to a comb in shape, and have the functions of supporting large-sized objects such as straw, sundries and the like in the removed objects, and sieving out and dropping granular grains in the removed objects so as to realize pre-screening. The pre-screening effect can be improved by the co-cooperation of the front pointer screen 10 and the rear pointer screen 11.

Referring to fig. 1 and 2, it is to be added that the tail end of the seed auger 4 far away from the fan 2 is connected with a first guide plate 31 which is obliquely arranged, one end of the first guide plate 31 far away from the seed auger 4 is higher than one end of the first guide plate 31 close to the seed auger 4, and after clean seeds fall onto the first guide plate 31, the seeds can slide into the seed auger 4 along the first guide plate 31 to be conveyed. The tailing end of the impurity auger 5, which is far away from the seed auger 4, is connected with a second guide plate 32 which is obliquely arranged, one end of the second guide plate 32, which is far away from the impurity auger 5, is higher than one end of the second guide plate 32, which is close to the impurity auger 5, and when the impurity falls to the second guide plate 32, the impurity Yu Hui slides into the impurity auger 5 along the second guide plate 32.

Referring to fig. 1 and 3, a deflector 22 is installed at one end of the woven screen 14 near the lower air outlet 8, and an air channel is formed between the middle corrugated plate 12 and the deflector 22, which faces the two louver screens 13. In this embodiment, the opening of the baffle 22 may be adjusted, and the airflow distribution of the vibrating screen 3 can be controlled by adjusting the opening of the baffle 22, so as to realize the functions of rapid penetration of grains and rapid discharge of impurities under different working conditions.

Referring to fig. 1 and 5, the fan 2 includes a rotating shaft 201, a supporting frame 202, a plurality of blades 203, an outer mounting seat 204 and an inner mounting seat 205, wherein two ends of the outer mounting seat 204 are respectively connected with the cleaning frame 1, two ends of the inner mounting seat 205 are respectively connected with the cleaning frame 1, two ends of the rotating shaft 201 are respectively connected with the outer mounting seat 204 and the inner mounting seat 205 in a rotating manner, the supporting frame 202 is connected with the rotating shaft 201, and the plurality of blades 203 are uniformly distributed and connected on the supporting frame 202. The motor can drive the blades 203 on the rotating shaft 201 to rotate, so that the fan 2 can rotate.

Referring to fig. 3 and 6, the vibrating screen 3 is fixedly provided with a driving shaft 23, two ends of the driving shaft 23 are respectively and eccentrically connected with an eccentric shaft 24, the two eccentric shafts 24 are rotatably installed on the cleaning frame 1, the two eccentric shafts 24 are respectively and fixedly connected with a driving wheel 25 and a driven wheel 26, and the driving wheel 25 and the driven wheel 26 are respectively provided with a balancing weight 27. The driving wheel 25 can be driven to rotate by a driving device on the combine harvester to drive the driving shaft 23 to eccentrically rotate, so that the vibrating screen 3 can vibrate.

Referring to fig. 7, the grain auger 4 includes a first horizontal auger 41, a grain elbow 42, a grain lifting auger 43 and a grain lifting cylinder 44, the first horizontal auger 41 is disposed on the cleaning frame 1, the lower end of the grain elbow 42 is connected with the first horizontal auger 41, the grain lifting cylinder 44 is connected with the top end of the grain elbow 42, the grain lifting auger 43 is disposed inside the grain lifting cylinder 44, the grain lifting auger 43 is communicated with a grain tank on the combine harvester, and clean grains fall into the grain auger 4 and are conveyed into the grain tank of the harvester.

Referring to fig. 8 to 10, the miscellaneous surplus auger 5 includes a second horizontal auger 51, a secondary threshing chamber 52, a lifting Yanggu auger 53 and a lifting housing 54, the second horizontal auger 51 is disposed on the cleaning frame 1, and the second horizontal auger 51 is located at one side of the first horizontal auger 41 away from the blower 2, the secondary threshing chamber 52 is connected with a discharge end of the second horizontal auger 51, the lifting housing 54 is connected with the lifting housing 54, the lifting Yanggu auger 53 is disposed inside the lifting housing 54, and an upper end of the lifting Yanggu auger 53 is located above the front pointer screen 10. The end of the second horizontal auger 51 is provided with a secondary threshing toothed plate 28, the secondary threshing toothed plate 28 is positioned in a secondary threshing chamber 52, and a secondary threshing fixed cover 29 is arranged in the secondary threshing chamber 52. After the impurity enters the second horizontal auger 51, the impurity is driven to move, the impurity can be cut through the secondary threshing toothed plate 28 and the secondary threshing fixed cover 29, the impurity with a larger structure and a heavier impurity can be processed into small impurity which is easy to screen, the processed impurity is conveyed to the front pointer screen 10 again for secondary cleaning, grains and the impurity after secondary threshing are quickly filtered under the action of the air flow of the upper air outlet 7, and the small impurity is quickly discharged.

The implementation principle of the cleaning system of the embodiment of the invention is as follows: when in actual use, the air flow can be blown out through the upper air outlet 7 and the lower air outlet 8 by the fan 2, the air flow blown out by the fan 2 acts on the pointer sieve, the middle corrugated plate 12, the scale sieve 13 and the braiding sieve 14, the front pointer sieve 10 and the rear pointer sieve 11 at the upper layer pre-sieve the separated matters, the middle scale sieve 13 performs coarse sieving on the separated matters, the braiding sieve 14 at the lower layer performs fine sieving on the separated matters, three-layer screening is realized, clean grains fall into the grain auger 4 and are conveyed into a grain tank of the harvester, and the air flow blown out by the fan 2 through the lower air outlet 8 blows the miscellaneous surplus to the miscellaneous auger 5 for secondary cleaning. Through setting up two air outlets, improved the air current blown out by fan 2 and blown out the ability of holding in the palm the deviate from the thing, and the three-layer cleaning sieve that cooperation pointer sieve, scale sieve 13 and woven screen 14 constitute has improved cleaning efficiency and cleaning quality.

The utility model also provides a combine harvester, which comprises the cleaning system.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims (10)

1. The utility model provides a cleaning system, includes cleaning frame (1), be provided with fan (2), shale shaker (3), seed auger (4) and miscellaneous auger (5) on cleaning frame (1), its characterized in that, be provided with spiral case (6) on cleaning frame (1), fan (2) are located spiral case (6) are interior, spiral case (6) top forms last air outlet (7), spiral case (6) below forms air outlet (8), be provided with on shale shaker (3) corrugated plate (9), preceding pointer sieve (10), back pointer sieve (11), well ripple board (12), a plurality of corrugated plate (13) and braiding sieve (14), corrugated plate (9) are close to cleaning frame (1) top sets up, preceding pointer sieve (10) with the one end butt setting of going up corrugated plate (9) and keeping away from fan (2), back pointer sieve (11) are located preceding pointer (10) top pointer (9) forms air outlet (8), the corrugated plate (9) are kept away from in the top of the corrugated plate (9) sets up in the top of the sieve (13), the top of the corrugated plate (9) is set up in the top of the ripple sieve (13), a plurality of fish scale sieves (13) are located in the corrugated board (12) is kept away from the one end of fan (2), a plurality of fish scale sieves (13) butt sets up in proper order from beginning to end, weave sieve (14) to be located fish scale sieves (13) below, the opening orientation of lower air outlet (8) weave sieve (14) with seed grain auger (4) set up.

2. A cleaning system according to claim 1, characterized in that the height of the end of the fish scale sieve (13) close to the fan (2) is lower than the height of the end of the fish scale sieve (13) far away from the fan (2), and an adjusting plate (30) for adjusting the opening of the fish scale sieve (13) is arranged on the fish scale sieve (13).

3. A cleaning system according to claim 1, characterized in that the cleaning frame (1) is provided with an upper air deflector (17) and a lower air deflector (18), the upper air deflector (17) and the lower air deflector (18) are arranged close to the lower air outlet (8), the upper air deflector (17) is positioned above the lower air deflector (18), a first lower air duct (19) is formed between the upper air deflector (17) and the volute (6), the opening of the first lower air duct (19) is arranged towards the gap between the fish scale sieve (13) and the braiding sieve (14), a second lower air duct (20) is formed between the upper air deflector (17) and the lower air deflector (18), the opening of the second lower air duct (20) is arranged towards the gap between the braiding sieve (14) and the seed auger (4), a third lower air duct (21) is formed below the lower air deflector (18), and the third lower air duct (21) is arranged towards the residue auger (5).

4. A cleaning system according to claim 1, characterized in that the height of the upper corrugated plate (9) near the end of the fan (2) is lower than the height of the end far away from the fan (2), the height of the middle corrugated plate (12) near the end of the fan (2) is lower than the height of the end far away from the fan (2), the height of the front pointer screen (10) near the end of the upper corrugated plate (9) is lower than the height of the end far away from the upper corrugated plate (9), and the height of the rear pointer screen (11) near the end of the front pointer screen (10) is lower than the height of the end far away from the front pointer screen (10).

5. The cleaning system according to claim 1, wherein the fan (2) comprises a rotating shaft (201), a supporting frame (202), a plurality of blades (203), an outer mounting seat (204) and an inner mounting seat (205), two ends of the outer mounting seat (204) are respectively connected with the cleaning machine frame (1), two ends of the inner mounting seat (205) are respectively connected with the cleaning machine frame (1), two ends of the rotating shaft (201) are respectively connected with the outer mounting seat (204) and the inner mounting seat (205) in a rotating manner, the supporting frame (202) is connected with the rotating shaft (201), and a plurality of blades (203) are uniformly distributed and connected on the supporting frame (202).

6. A cleaning system according to claim 1, characterized in that the end of the woven screen (14) adjacent to the lower outlet opening (8) is provided with a deflector (22).

7. A cleaning system according to claim 1, characterized in that the vibrating screen (3) is fixedly provided with a driving shaft (23), two ends of the driving shaft (23) are respectively and eccentrically connected with an eccentric shaft (24), two eccentric shafts (24) are rotatably mounted on the cleaning frame (1), two eccentric shafts (24) are respectively and fixedly connected with a driving wheel (25) and a driven wheel (26), and the driving wheel (25) and the driven wheel (26) are respectively provided with a balancing weight (27).

8. A cleaning system according to claim 1, characterized in that the grain auger (4) comprises a first horizontal auger (41), a grain elbow (42), a grain lifting auger (43) and a grain lifting cylinder (44), the first horizontal auger (41) is arranged on the cleaning frame (1), the lower end of the grain elbow (42) is connected with the first horizontal auger (41), the grain lifting cylinder (44) is connected with the top end of the grain elbow (42), and the grain lifting auger (43) is arranged inside the grain lifting cylinder (44);

The trash auger (5) comprises a second horizontal auger (51), a secondary threshing chamber (52), a lifting grain auger (53) and a lifting shell (54), wherein the second horizontal auger (51) is arranged on the cleaning frame (1), the second horizontal auger (51) is located on one side, away from the fan (2), of the first horizontal auger (41), the secondary threshing chamber (52) is connected with the discharge end of the second horizontal auger (51), the lifting shell (54) is connected with the lifting shell (54), the lifting grain auger (53) is arranged inside the lifting shell (54), a secondary threshing toothed plate (28) is arranged at the end of the second horizontal auger (51), the secondary threshing toothed plate (28) is located in the secondary threshing chamber (52), and a secondary threshing fixed cover (29) is arranged in the secondary threshing chamber (52).

9. A cleaning system according to claim 1, characterized in that the end of the screen (13) remote from the corrugated board (12) is provided with a fixed tail screen (15), and the end of the fixed tail screen (15) remote from the screen (13) is provided with an elastic tail screen (16).

10. A combine harvester comprising a cleaning system according to any one of claims 1-9.