Threshing and cleaning equipment for cereal grains

Abstract

The invention relates to the technical field of threshing, in particular to grain threshing and cleaning equipment which comprises a frame body, a gear motor is arranged at the bottom of the frame body, a threshing box is arranged in the middle of the top of the frame body, a threshing rotating rod is rotationally installed at the top of the threshing box, and a threshing frame is arranged on the outer surface of the threshing rotating rod. A fine sieve plate is arranged at the bottom of the threshing box, and a discharge port is formed in one side of the bottom of the threshing box; the coarse sieve plate is arranged in the middle of the threshing box, is provided with a double-layer structure and comprises an upper sieve plate and a lower sieve plate; and the reverse vibration sieve assembly is arranged between the upper sieve plate and the lower sieve plate, and the reverse vibration sieve assembly is used for driving the upper sieve plate and the lower sieve plate to generate relative motion and tearing the crushed straw adhered to the grains. Compared with the prior art, the coarse screening plate is arranged to be matched with the reverse vibration screening assembly, the stability and screening precision of the system are improved, and the threshing equipment runs more efficiently.

Description

Technical Field

[0001] The present invention relates to the technical field of threshing, and particularly to a threshing and cleaning device for cereal grains. Background Art

[0002] Threshing of cereal grains is a key step in separating mature grains from the ear axes or pods of plants. The main purpose is to obtain pure grains for storage, processing, and consumption. After crops (such as rice, wheat, corn) mature, the grains are usually attached to the straw or wrapped in glumes. Direct storage is likely to cause mildew, pests, and occupies a large space with high transportation costs. Threshing can effectively remove impurities such as straw and glumes, reduce the growth of microorganisms and water residue, and improve the storage safety of grains.

[0003] In the prior art, in a threshing and cleaning device for cereal grains in a Chinese patent document with the publication number CN119032748A, it is proposed to start the servo motor during the threshing process. At this time, the fallen cereal grains and impurities will accumulate on the surface of the coarse sieve. The servo motor will drive the rotating rod on the surface to rotate, and the telescopic long plate fixed on the surface of the rotating rod will rotate. The cleaning round rod on the surface of the telescopic long plate will move together to ensure that the cleaning round rod can accurately clean the inner wall of the outer shell. Among the components described above, the cereal particles and impurities accumulated on the surface of the coarse sieve are stirred to prevent the coarse sieve from being blocked. However, consistent with the traditional method, during the threshing of cereal grains, usually some fine or slender straws will adhere to the outer surface of the grains. During the normal screening process, they are likely to be screened out together or adhered to the screening net, and secondary selection or cleaning of the screening net is required, which leads to a reduction in efficiency. Therefore, the present application discloses a threshing and cleaning device for cereal grains. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a threshing and cleaning device for cereal grains to solve the problems that during the threshing of cereals, fine straws are easily adhered to the grains or block the sieve, resulting in a reduction in cleaning efficiency and an increase in secondary processing costs.

[0005] For the above purposes, the present invention provides a threshing and cleaning device for cereal grains, including a frame body. A reduction motor is provided at the bottom of the frame body. A threshing box is provided in the middle of the top of the frame body. A threshing rotating rod is rotatably installed at the top of the threshing box. A threshing frame is arranged on the outer surface of the threshing rotating rod. A fine sieve plate is provided at the bottom of the threshing box, and a discharge port is provided on one side of the bottom of the threshing box. A conveyor belt is provided on one side of the top of the frame body, and a debris passage is provided on the other side of the top surface of the frame body. The conveyor belt and the debris passage are located on both sides of the threshing box respectively. The conveyor belt is used to convey the unthreshed straw to the threshing box, and the debris passage is used to discharge the straw leaves generated during the threshing process. The reduction motor is connected to one side of the threshing rotating rod by belt drive, and the threshing rotating rod is connected to one of the rotating rollers of the conveyor belt by belt drive; a coarse sieve plate, which is arranged in the middle of the threshing box and has a double-layer structure, including an upper sieve plate and a lower sieve plate; a reverse vibration sieve assembly, which is arranged between the upper sieve plate and the lower sieve plate and is used to drive the upper sieve plate and the lower sieve plate to generate relative movement to tear the broken straw adhered to the grains; an auxiliary assembly, which is arranged on one side of the top surface of the frame body and includes a turning module and a scraping module. The turning module is used to reciprocally turn the cereal straw during threshing, and the scraping module is used to scrape and clean the top surface of the upper sieve plate.

[0006] Preferably, a broken rod outlet is opened on one side of the bottom of the debris passage, a suction fan is provided at the bottom of the broken rod outlet, an adsorption passage is provided on one side of the bottom of the threshing box, and one side of the adsorption passage is connected to the air inlet of the suction fan.

[0007] Preferably, the upper sieve plate and the lower sieve plate are slidably installed inside the threshing box and are arranged to slide relative to each other.

[0008] Preferably, a guiding groove is opened on one side of the threshing box, an eccentric column is provided at one end of the threshing rotating rod, an extension rod is provided on one side of the lower sieve plate, the extension rod penetrates through the guiding groove, a socket rod is movably sleeved on one side of the eccentric column, and the other end of the socket rod is movably sleeved on the extension rod.

[0009] Preferably, the reverse vibrating sieve assembly includes a fixed cylinder fixedly installed on the top of the lower sieve plate. An activity cylinder is sleeved on the top of the fixed cylinder. A guiding cylinder is arranged in the middle of the activity cylinder. A reverse pull rod is slidably installed inside the guiding cylinder. A fixing plate is fixedly installed at the top of the reverse pull rod. The fixing plate is fixedly connected to the bottom of the upper sieve plate. A through groove is formed on one side of the guiding cylinder and penetrates through one side of the reverse pull rod. A driving rod is slidably installed inside the through groove. One side of the driving rod is inclined. When the driving rod moves horizontally, it will drive the reverse pull rod to move vertically.

[0010] Preferably, first pushing blocks are arranged on both sides of the driving rod, and the two first pushing blocks are arranged in opposite directions. Second pushing blocks corresponding to the first pushing blocks are arranged on both sides inside the fixed cylinder. The opposite surfaces of the first pushing block and the second pushing block are both inclined.

[0011] Preferably, a reset spring is fixedly connected to the end of the reverse pull rod away from the fixing plate, and the other end of the reset spring is fixedly connected to the inner bottom surface of the fixed cylinder.

[0012] Preferably, the turning module includes a fixed frame fixedly installed between the conveyor belt and the threshing box. A servo motor is fixedly installed on one side of the fixed frame. A lead screw is rotatably installed on the top of the fixed frame. One end of the lead screw is fixedly connected to the output end of the servo motor. A turning block is slidably installed between the two 30s. A threaded groove is formed through the middle of the turning block and is threadedly connected to the lead screw. The top of the turning block is used to turn the middle position of the straw back and forth.

[0013] Preferably, the scraping module includes a blower fixedly installed on the other side of the fixed frame. A through hole is formed in the middle of the turning block. One side of the blower is provided with a telescopic sleeve. One end of the telescopic sleeve is connected to a connecting scraping pipe. One side of the connecting scraping pipe is semicircular, and the semicircular side of the connecting scraping pipe is closely attached to the top surface of the upper sieve plate.

[0014] Preferably, a plurality of nozzles are formed on both sides of the connecting scraping pipe.

[0015] Advantages of the present invention: 1. This kind of threshing and cleaning equipment for cereal grains is equipped with a coarse screen plate and a reverse vibration screen assembly. The relative sliding of the upper screen plate and the lower screen plate and the vertical reciprocating motion of the reverse pull rod can realize effective screening and stripping of grains and broken straw. While the eccentric column drives the lower screen plate to slide back and forth, the driving rod interacts with the inclined pushing block to make the reverse pull rod vibrate vertically and drive the fixed plate to act on the upper screen plate synchronously, so that the upper screen plate and the lower screen plate form a relative vibration state. This reverse vibration mode can strengthen the tearing and separation of broken straw on the surface of grains, improve the screening effect, and reduce the blockage of the screen plate, ensuring that the grains pass through the sieve holes smoothly to enter the subsequent processing links. In addition, the reset spring provides a continuous return force to make the screen plate move more smoothly and avoid excessive displacement or failure during the screening process. The limit of the upper and lower screen plates ensures that they can only slide within the set range, which improves the stability and screening accuracy of the system and makes the threshing equipment run more efficiently.

[0016] 2. This kind of cereal threshing and cleaning equipment is equipped with a scraping module, which provides high-pressure airflow through a blower, and uses the reciprocating motion of the flipping block to make the connected scraper tube move synchronously in contact with the surface of the upper screen plate. The nozzle sprays airflow to effectively blow away the adhered straw and impurities to prevent the screen holes from being blocked. The semicircular scraper tube slightly scrapes the screen plate during movement to further clean up stubborn impurities. When used in conjunction with the reverse vibration screen component, the scraping module can continuously clean the surface of the screen plate to reduce the impact of adhesions. At the same time, the vibration of the reverse vibration screen component can accelerate the separation of impurities and make screening more thorough. The synergistic effect of the two not only improves the screening efficiency, but also effectively prevents blockage, ensures the long-term stable operation of the equipment, and improves the threshing and cleaning effect.

[0017] 3. This kind of cereal threshing and cleaning equipment is provided with a turning module. The top of the turning block contacts the middle end of the straw and continuously turns the straw during its forward and backward movement, so that the straw is fully exposed within the action range of the threshing rotating rod. During this process, the turning block can effectively prevent the straw from being entangled with each other or blocking the threshing area, and at the same time make it easier to separate the grains in the straw from the straw. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 The enlarged structural diagram at A in the middle; Figure 3 Schematic diagram of the sectional three-dimensional structure of the present invention; Figure 4 Schematic diagram of the internal structure of the present invention; Figure 5 For the present invention Figure 3 Schematic diagram of the enlarged structure at position B in; Figure 6 Schematic diagram of the auxiliary component structure of the present invention; Figure 7 Schematic diagram of the reverse vibration sieve component structure of the present invention; Figure 8 Schematic diagram of the internal structure of the reverse vibration sieve component of the present invention; Figure 9 Schematic diagram of the sectional structure of the reverse vibration sieve component of the present invention.

[0020] The markings in the figure are: 1. Frame body; 2. Reduction motor; 3. Threshing rotating rod; 4. Threshing frame; 5. Conveyor belt; 6. Threshing box; 7. Debris passage; 8. Coarse sieve plate; 9. Fine sieve plate; 10. Discharge port; 11. Adsorption passage; 12. Suction fan; 13. Broken rod outlet; 14. Upper sieve plate; 15. Lower sieve plate; 16. Fixed cylinder; 17. Movable cylinder; 18. Guide cylinder; 19. Reverse pull rod; 20. Fixed plate; 21. Through groove; 22. Drive rod; 23. First push block; 24. Second push block; 25. Return spring; 26. Guide groove; 27. Extension rod; 28. Socket rod; 29. Eccentric column; 30. Fixed frame; 31. Servo motor; 32. Lead screw; 33. Turning block; 34. Blower; 35. Telescopic sleeve; 36. Connecting scraping pipe; 37. Nozzle. Specific embodiments

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0022] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] As Figures 1 to 9 shown, a threshing and cleaning device for cereal grains includes a frame 1. A reduction motor 2 is provided at the bottom of the frame 1. A threshing box 6 is provided in the middle of the top of the frame 1. A threshing rotating rod 3 is rotatably installed at the top of the threshing box 6. A threshing frame 4 is provided on the outer surface of the threshing rotating rod 3. A fine sieve plate 9 is provided at the bottom of the threshing box 6, and a discharge port 10 is provided on one side of the bottom of the threshing box 6. A conveyor belt 5 is provided on one side of the top of the frame 1, and a debris passage 7 is provided on the other side of the top surface of the frame 1. The conveyor belt 5 and the debris passage 7 are respectively located on both sides of the threshing box 6. The conveyor belt 5 is used to convey unthreshed straw to the threshing box 6, and the debris passage 7 is used to discharge the straw leaves generated during the threshing process. The reduction motor 2 is connected to one side of the threshing rotating rod 3 by belt drive, and the threshing rotating rod 3 is connected to one of the rotating rollers of the conveyor belt 5 by belt drive; a coarse sieve plate 8 is provided in the middle of the threshing box 6. The coarse sieve plate 8 has a double-layer structure and includes an upper sieve plate 14 and a lower sieve plate 15; a reverse vibration sieve assembly is provided between the upper sieve plate 14 and the lower sieve plate 15. The reverse vibration sieve assembly is used to drive the upper sieve plate 14 and the lower sieve plate 15 to generate relative movement to tear the broken straw adhered to the grains; an auxiliary assembly is provided on one side of the top surface of the frame 1. The auxiliary assembly includes a turning module and a scraping module. The turning module is used to reciprocally turn the cereal straw during threshing, and the scraping module is used to scrape and clean the top surface of the upper sieve plate 14. One side of the bottom of the debris passage 7 is provided with a broken rod outlet 13. A suction fan 12 is provided at the bottom of the broken rod outlet 13. One side of the bottom of the threshing box 6 is provided with an adsorption passage 11. One side of the adsorption passage 11 is connected to the air inlet of the suction fan 12; Cereal straw is fed into the threshing box 6 through the conveyor belt 5. The threshing rotating rod 3 rotates driven by the reduction motor 2, driving the threshing frame 4 to complete threshing. The grains and impurities are preliminarily screened by the coarse sieve plate 8. The double-layer structure of the coarse sieve plate 8 combined with the reverse vibration sieve assembly separates the broken straw from the grains. The fine sieve plate 9 further screens out small impurities. The screened grains are discharged through the discharge port 10. At the same time, the turning module reciprocally turns the straw to improve the threshing effect, and the scraping module cleans the upper sieve plate 14 to avoid blockage. The impurities and broken straw enter the debris channel 7. Among them, the larger broken rods are discharged through the broken rod outlet 13, while the fine impurities are extracted by the suction fan 12 through the adsorption channel 11, finally completing the threshing and cleaning operations.

[0024] As Figures 1 to 5 , Figures 7 to 9 shown, the upper sieve plate 14 and the lower sieve plate 15 are slidably installed inside the threshing box 6, and the upper sieve plate 14 and the lower sieve plate 15 are arranged to slide relative to each other. A guiding groove 26 is opened on one side of the threshing box 6. One end of the threshing rotating rod 3 is provided with an eccentric column 29. One side of the lower sieve plate 15 is provided with an extension rod 27. The extension rod 27 passes through the guiding groove 26. A socket rod 28 is movably sleeved on one side of the eccentric column 29, and the other end of the socket rod 28 is movably sleeved on the extension rod 27. The reverse vibration sieve assembly includes a fixed cylinder 16 fixedly installed on the top of the lower sieve plate 15. An activity cylinder 17 is sleeved on the top of the fixed cylinder 16. A guiding cylinder 18 is arranged in the middle of the activity cylinder 17. A reverse pull rod 19 is slidably installed inside the guiding cylinder 18. A fixed plate 20 is fixedly installed at the top of the reverse pull rod 19. The fixed plate 20 is fixedly connected to the bottom of the upper sieve plate 14. A through groove 21 is opened on one side of the guiding cylinder 18, and the through groove 21 penetrates through one side of the reverse pull rod 19. A driving rod 22 is slidably installed inside the through groove 21. One side of the driving rod 22 is inclined. When the driving rod 22 translates, it will drive the reverse pull rod 19 to move vertically. Two first pushing blocks 23 are arranged on both sides of the driving rod 22, and the two first pushing blocks 23 are arranged in opposite directions. Two second pushing blocks 24 corresponding to the first pushing blocks 23 are arranged on both sides inside the fixed cylinder 16. The opposite surfaces of the first pushing blocks 23 and the second pushing blocks 24 are both inclined. One end of the reverse pull rod 19 away from the fixed plate 20 is fixedly connected to a return spring 25, and the other end of the return spring 25 is fixedly connected to the inner bottom surface of the fixed cylinder 16; When the threshing device is running, the threshing rotating rod 3 rotates under the drive of the reduction motor 2, and the eccentric column 29 rotates accordingly, driving the socket rod 28 to move. The socket rod 28 acts on the lower sieve plate 15 through the extension rod 27, causing it to reciprocate. At the same time, the fixed cylinder 16 fixedly installed on the top of the lower sieve plate 15 remains stable. The top of the fixed cylinder 16 is sleeved with a movable cylinder 17. A guide cylinder 18 is arranged in the middle of the movable cylinder 17. The reverse pull rod 19 inside the guide cylinder 18 reciprocates in the vertical direction under the action of the drive rod 22 during the sliding process. When the drive rod 22 moves horizontally, the two first push blocks 23 contact the two second push blocks 24 inside the fixed cylinder 16. Since the contact surfaces of the first push block 23 and the second push block 24 are both inclined structures, the second push block 24 will push the first push block 23 to change its position, thereby driving the drive rod 22 to move. The drive rod 22 will also push the reverse pull rod 19 to move vertically. At the same time, the fixed plate 20 will drive the upper sieve plate 14 to move synchronously, forming a relative sliding movement trend with the lower sieve plate 15. During the whole process, the return spring 25 connected to the bottom end of the reverse pull rod 19 continuously provides a return force to ensure that the upper sieve plate 14 and the lower sieve plate 15 always maintain a relative vibration state, effectively tearing and peeling off the broken straws adhered to the grains, enhancing the screening effect, and finally conveying the cleaned grains to the subsequent processing link. Among them, the upper sieve plate 14 and the lower sieve plate 15 are slidably installed inside the threshing box 6 and slide relatively. In this initial state, the upper sieve plate 14 can only slide downward, and the lower sieve plate 15 can only slide upward, and neither can slide in the opposite direction, achieving a certain limit and only sliding relatively within the interval.

[0025] Such as Figure 3 , Figure 4 , Figure 6As shown in the figure, the turning module includes a fixed frame 30 fixedly installed between the conveyor belt 5 and the threshing box 6. A servo motor 31 is fixedly installed on one side of the fixed frame 30. A lead screw 32 is rotatably installed on the top of the fixed frame 30. One end of the lead screw 32 is fixedly connected to the output end of the servo motor 31. A turning block 33 is slidably installed between the two fixed frames 30. A threaded groove is formed through the middle of the turning block 33 and is threadedly connected to the lead screw 32. The top of the turning block 33 is used to reciprocally turn the middle position of the straw. When the equipment is running, the servo motor 31 is started to drive the lead screw 32 to rotate. The thread on the lead screw 32 drives the turning block 33 to reciprocally move along the direction of the lead screw 32. The top of the turning block 33 contacts the middle position of the straw and continuously turns the straw during its forward and backward movement, making it fully exposed within the action range of the threshing rotating rod 3. During this process, the turning block 33 can effectively prevent the straw from entangling with each other or blocking the threshing area, and at the same time, it promotes the separation of the grains in the straw from the straw more easily. Due to the high transmission stability of the lead screw 32, the turning action remains uniform and powerful, ensuring the uniform distribution of the materials inside the threshing box 6 and improving the threshing efficiency and screening effect. The scraping module includes a blower 34 fixedly installed on the other side of the fixed frame 30. A through hole is formed in the middle of the turning block 33. One side of the blower 34 is provided with a telescopic sleeve 35. One end of the telescopic sleeve 35 is connected to a connecting scraping pipe 36. One side of the connecting scraping pipe 36 is arranged in a semi-circular arc shape, and the semi-circular arc side of the connecting scraping pipe 36 is closely attached to the top surface of the upper sieve plate 14. A number of nozzles 37 are opened on both sides of the connecting scraping pipe 36. When the equipment is running, the servo motor 31 drives the lead screw 32 to rotate, causing the turning block 33 to reciprocally move along the track of the lead screw 32. The blower 34 is started synchronously, and the air flow is conveyed through the telescopic sleeve 35 to the connecting scraping pipe 36. The scraping pipe moves synchronously along with the turning block 33, moving closely along the surface of the upper sieve plate 14. At the same time, the nozzles 37 on both sides of the connecting scraping pipe 36 spray high-pressure air flow, blowing away the residual straw and fine impurities adhering to the surface of the upper sieve plate 14 and discharging them to both sides. These blown-up impurities either re-enter the threshing system for pulverization or are discharged through the broken straw outlet 13 of the debris channel 7, avoiding residual blockage of the sieve holes. The semi-circular arc structure of the connecting scraping pipe 36 also slightly scrapes the surface of the sieve plate during the movement, further removing stubborn impurities, ensuring that the sieve plate always maintains a good screening state, improving the threshing and cleaning efficiency, and cooperating with the reverse vibration sieve assembly for effective anti-blocking, further improving the threshing efficiency.

[0026] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, and they are not provided in detail for the sake of brevity.

[0027] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A threshing and cleaning device for cereals, characterized in that: include: A frame (1), wherein a reduction motor (2) is arranged at the bottom of the frame (1), a threshing box (6) is arranged at the middle of the top of the frame (1), a threshing rotating rod (3) is rotatably mounted on the top of the threshing box (6), a threshing frame (4) is arranged on the outer surface of the threshing rotating rod (3), a fine screen plate (9) is arranged at the bottom of the threshing box (6), and a discharge port (10) is arranged on one side of the bottom of the threshing box (6), a conveyor belt (5) is arranged on one side of the top of the frame (1), and a debris channel (7) is arranged on the other side of the top surface of the frame (1), the conveyor belt (5) and the debris channel (7) are respectively located on both sides of the threshing box (6), the conveyor belt (5) is used to transport unthreshed straw to the threshing box (6), and the debris channel (7) is used to discharge straw leaves generated during the threshing process, the reduction motor (2) and the threshing rotating rod (3) are connected to each other. The threshing rotating rod (3) is connected to one side of the threshing box (6) by a belt transmission, and the threshing rotating rod (3) is connected to one of the rotating rollers of the conveyor belt (5) by a belt transmission; a coarse screen plate (8), the coarse screen plate (8) is arranged in the middle of the threshing box (6), the coarse screen plate (8) is provided with a double-layer structure, and the coarse screen plate (8) includes an upper screen plate (14) and a lower screen plate (15); a reverse shaking screen component, the reverse shaking screen component is arranged between the upper screen plate (14) and the lower screen plate (15), and the reverse shaking screen component is used to drive the upper screen plate (14) and the lower screen plate (15) to produce relative movement, so as to tear off the broken straw adhered to the grains; an auxiliary component, the auxiliary component is arranged on one side of the top surface of the frame (1), and the auxiliary component includes a turning module and a scraping module, the turning module is used to reciprocate the turning of the grain straw during threshing, and the scraping module is used to scrape and clean the top surface of the upper screen plate (14).

2. The threshing and cleaning equipment for cereals according to claim 1, characterized in that: A rod breaking outlet (13) is provided at one side of the bottom of the debris channel (7), a suction fan (12) is provided at the bottom of the rod breaking outlet (13), an adsorption channel (11) is provided at one side of the bottom of the threshing box (6), and one side of the adsorption channel (11) is connected to the air inlet of the suction fan (12).

3. The threshing and cleaning equipment for cereals according to claim 1, characterized in that: The upper sieve plate (14) and the lower sieve plate (15) are slidably installed inside the threshing box (6), and the upper sieve plate (14) and the lower sieve plate (15) are relatively slidably arranged.

4. The threshing and cleaning equipment for cereals according to claim 1, characterized in that: A guide groove (26) is provided on one side of the threshing box (6); an eccentric column (29) is provided on one end of the threshing rotating rod (3); an extension rod (27) is provided on one side of the lower screen plate (15); the extension rod (27) penetrates the guide groove (26); a sleeve connecting rod (28) is movably sleeved on one side of the eccentric column (29); the other end of the sleeve connecting rod (28) is movably sleeved on the extension rod (27).

5. The threshing and cleaning equipment for cereals according to claim 4, characterized in that: The reverse vibration screen assembly comprises a fixed cylinder (16) fixedly mounted on the top of the lower screen plate (15), a movable cylinder (17) being sleeved on the top of the fixed cylinder (16), a guide cylinder (18) being arranged in the middle of the movable cylinder (17), a reverse pull rod (19) being slidably mounted inside the guide cylinder (18), a fixed plate (20) being fixedly mounted on the top of the reverse pull rod (19), the fixed plate (20) being fixedly connected to the bottom of the upper screen plate (14), a through groove (21) being provided on one side of the guide cylinder (18), and the through groove (21) being provided through one side of the reverse pull rod (19), a driving rod (22) being slidably mounted inside the through groove (21), one side of the driving rod (22) being arranged in an inclined manner, and when the driving rod (22) is translated, it will drive the reverse pull rod (19) to move vertically.

6. The threshing and cleaning equipment for cereals according to claim 5, characterized in that: A first pushing block (23) is arranged on both sides of the driving rod (22), and the two first pushing blocks (23) are arranged in opposite directions. Two second pushing blocks (24) corresponding to the first pushing blocks (23) are arranged on both sides of the interior of the fixed cylinder (16), and the opposing surfaces of the first pushing block (23) and the second pushing block (24) are arranged in an inclined manner.

7. The threshing and cleaning equipment for cereals according to claim 6, characterized in that: One end of the reverse pull rod (19) away from the fixed plate (20) is fixedly connected to a return spring (25), and the other end of the return spring (25) is fixedly connected to the inner bottom surface of the fixed cylinder (16).

8. The threshing and cleaning equipment for cereals according to claim 1, characterized in that: The turning module comprises a fixed frame (30) fixedly mounted between the conveyor belt (5) and the threshing box (6); a servo motor (31) is fixedly mounted on one side of the fixed frame (30); a lead screw (32) is rotatably mounted on the top of the fixed frame (30); one end of the lead screw (32) is fixedly connected to the output end of the servo motor (31); a turning block (33) is slidably mounted between the two 30s; a threaded groove is formed through the middle of the turning block (33) and is threadedly connected to the lead screw (32); and the top of the turning block (33) is used to reciprocate the middle end of the straw.

9. The threshing and cleaning equipment for cereals according to claim 8, characterized in that: The scraping module comprises a blower (34) fixedly mounted on the other side of the fixing frame (30); a through hole is provided in the middle of the flip block (33); a telescopic sleeve (35) is provided on one side of the blower (34); one end of the telescopic sleeve (35) is connected to a connecting scraper pipe (36); one side of the connecting scraper pipe (36) is arranged in a semicircular arc shape, and the connecting scraper pipe (36) on the semicircular arc side is in close contact with the top surface of the upper sieve plate (14).

10. The threshing and cleaning equipment for cereals according to claim 9, characterized in that: A plurality of nozzles (37) are provided on both sides of the connecting scraper pipe (36).

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