A device for threshing rice and a combine harvester

Abstract

This invention discloses a rice threshing device and a combine harvester, relating to the field of agricultural machinery technology. It includes a pre-threshing section and a threshing section connected to each other. The pre-threshing section includes a pre-threshing roller with flexible soft teeth fixedly arranged on its outer circumference. The flexible soft teeth are arranged radially along the pre-threshing roller. The flexible soft teeth include straight teeth and curved teeth. The curved teeth have a curved portion at the end away from the pre-threshing roller, and the curved portion intersects with the straight teeth. A first threshing gap exists between the straight teeth and the curved teeth, and the first threshing gap is smaller than the average diameter of the threshed product. This invention improves the threshing effect by setting a pre-threshing section with flexible soft teeth in front of the threshing section to remove easily detached grains. By setting the flexible soft teeth in both straight and curved forms, the intersecting straight and curved teeth can better generate a kneading action during the rotation of the threshing section, removing as many grains as possible while effectively protecting the integrity of the grains.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, and in particular to a threshing device and a combine harvester. Background Technology

[0002] Ratoon rice is a type of rice that is harvested twice from a single crop, offering advantages such as saving labor, seeds, and land, and has great potential for widespread adoption in my country. While manual harvesting can better preserve the integrity of the stubble, the processes of harvesting, transporting, and threshing are labor-intensive and inefficient. Furthermore, with the migration of rural labor and rising labor costs, farmers cultivating ratoon rice are increasingly demanding ratoon rice harvesting machines.

[0003] Ratoon rice is harvested twice a year, with the first crop accounting for more than half of the total annual yield. The threshing device is a crucial component of the ratoon rice harvester. During mechanized harvesting of the first crop, the rice panicles have a higher moisture content than those of single-crop rice. Existing threshing devices struggle to handle this, directly reducing the amount of rice collected and thus the yield of the first crop, consequently impacting farmers' income. Furthermore, unthreshed rice flows into subsequent straw processing, potentially increasing the difficulty and cost of these processes and forcing equipment to operate under suboptimal conditions, which could accelerate wear and tear over time. Therefore, a more efficient and effective threshing device is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a threshing device and combine harvester for ratooning rice to solve the problems existing in the prior art. A pre-threshing section with flexible soft teeth is set before the threshing section, and threshing is carried out in two stages, thereby solving the need for threshing the first harvest of ratooning rice.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A rice threshing device includes a pre-threshing section and a threshing section arranged sequentially. The pre-threshing section includes a pre-threshing drum, on the outer circumferential surface of which flexible soft teeth are fixedly arranged. The flexible soft teeth are arranged radially along the radial direction of the pre-threshing drum. The flexible soft teeth include straight teeth and curved teeth. The end of the curved teeth away from the pre-threshing drum has a curved portion, which intersects with the straight teeth. A first threshing gap is formed between the straight teeth and the curved teeth, and the first threshing gap is smaller than the average diameter of the threshed product.

[0007] In an exemplary embodiment, every two of the curved teeth and one of the straight teeth form a flexible tooth group, wherein the straight tooth is located between the two curved teeth, and the curved portions of the two curved teeth face the straight tooth and intersect with the straight tooth.

[0008] In an exemplary embodiment, the threshing section includes a threshing drum connected to the pre-threshing section drum, and the pre-threshing drum is circumferentially provided with threshing teeth.

[0009] In an exemplary embodiment, a first concave sieve plate is provided below the pre-threshing section, and a first sieve hole is provided on the first concave sieve plate. The inner diameter of the first sieve hole is larger than the maximum diameter of the grains of the threshing product and smaller than the minimum diameter of the stem. A second concave sieve plate is provided below the threshing section, and a second threshing gap is provided between the second concave sieve plate and the threshing section. The second sieve plate is provided with a second sieve hole, and the inner diameter of the second sieve hole is N times the maximum diameter of the grains of the threshing product, where N is an integer greater than 1.

[0010] In one exemplary embodiment, the device further includes an adjusting device for adjusting the size of the second threshing gap. The adjusting device includes a first rotary drive mechanism, a transmission rod, a transmission gear, a transmission rack, and a top rod. The transmission rod is connected to the output end of the first rotary drive mechanism. Transmission gears are provided at both ends of the transmission rod. The gears mesh with the transmission rack. The top end of the transmission rack is fixedly connected to the bottom end of the top rod. The top end of the top rod is fixedly connected to the second concave sieve plate.

[0011] In an exemplary embodiment, an anti-clogging toothed brush is fitted along the inner contour of the first concave sieve plate, and a telescopic mechanism is provided on the upper edges of both sides of the first concave sieve plate or the second concave sieve plate, with the moving end of the telescopic mechanism being fixedly connected to the anti-clogging toothed brush.

[0012] The first concave sieve plate is provided with a guide strip on the side near the anti-clogging toothbrush, and the anti-clogging toothbrush is provided with a guide groove that cooperates with the guide strip on the side near the first concave sieve plate.

[0013] In an exemplary embodiment, a feeding structure is fixedly provided at one end of the pre-threshing drum away from the threshing drum. The feeding structure includes a feeding cone and feeding blades spirally disposed on the outer surface of the feeding cone.

[0014] In one exemplary embodiment, the system further includes a threshing chamber and a storage chamber arranged vertically; the pre-threshing section and the threshing section are disposed inside the threshing chamber and rotatably connected to the threshing chamber; a second rotary drive mechanism is disposed outside the threshing chamber, and the output end of the second rotary drive mechanism is drively connected to the pre-threshing section; an agitation device is disposed inside the storage chamber, and a third rotary drive mechanism is disposed outside the storage chamber, and the output end of the third rotary drive mechanism is drively connected to the agitation device.

[0015] In one exemplary embodiment, a humidity sensing element is provided on the feed side of the pre-de-granulation section, and the humidity sensing element is signal-connected to the second rotary drive mechanism.

[0016] The present invention also provides a combine harvester, including the above-described threshing device.

[0017] The present invention achieves the following technical effects compared to the prior art:

[0018] By installing a pre-threshing section with flexible teeth in front of the threshing section, easily detached kernels are removed, thus improving the threshing effect. By using both straight and curved flexible teeth, it not only retains the advantages of traditional flexible teeth—reducing direct impact and pressure on the kernels and thus lowering the kernel breakage rate—but also, during the threshing rotation, the intersecting straight and curved teeth can better generate a kneading action, removing as many kernels as possible while effectively protecting their integrity.

[0019] Other technical solutions disclosed in this invention also have the following technical advantages:

[0020] 1. By setting an adjustment device, the first rotary drive mechanism drives the transmission rod to rotate, the transmission rod drives the transmission gear, the transmission gear drives the transmission rack, the transmission rack drives the top rod, and the top rod drives the second concave screen plate to move up or down, thereby changing the size of the second threshing gap between the threshing section and the second concave screen plate to adapt to specific working conditions and achieve better threshing effect.

[0021] 2. By fitting an anti-clogging toothed brush to the inner contour of the first concave sieve plate, and using a telescopic mechanism to drive the anti-clogging toothed brush to reciprocate back and forth, the brush teeth on the anti-clogging toothed brush scrape out the stems that are blocked in the smaller first sieve holes, preventing the stems from blocking the first concave sieve plate and affecting the threshing effect.

[0022] 3. By setting guide strips on the first concave screen plate and setting guide grooves on the anti-clogging toothbrush, the guide strips and guide grooves cooperate with each other to effectively improve the stability of the back-and-forth reciprocating motion of the anti-clogging toothbrush.

[0023] 4. By installing a stirring device inside the grain storage box, the stirring device can be rotated under the drive of the third rotary drive mechanism to stir the grains stored in the grain storage box, so that they are evenly distributed in the grain storage box and prevent the grains from accumulating in one place and affecting the function of the first concave sieve plate and / or the second concave sieve plate.

[0024] 5. By setting a humidity sensing element on the feed side of the pre-threshing section and connecting the humidity sensing element to the second rotary drive mechanism that drives the pre-threshing section and the threshing section, the rotation speed of the second rotary drive mechanism can be changed according to the humidity of the feed product. When the humidity is high, the rotation speed is reduced to avoid damaging the grains, and when the humidity is low, the rotation speed is increased to improve the threshing efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a threshing device disclosed in a specific embodiment of the present invention;

[0027] Figure 2 for Figure 1 A sectional view;

[0028] Figure 3 for Figure 2 Schematic diagram of the feed structure, pre-de-granulation section and de-granulation section;

[0029] Figure 4 for Figure 3 A schematic diagram of the flexible soft teeth in the pre-threshing section;

[0030] Figure 5 for Figure 2 Schematic diagram of the structure of the first and second concave sieve plates;

[0031] Figure 6 for Figure 5 A schematic diagram of the anti-clogging brush teeth;

[0032] Figure 7 for Figure 5 Enlarged view of section A in the middle;

[0033] Figure 8 for Figure 2 Schematic diagram of the regulating device;

[0034] Figure 9 for Figure 1 Schematic diagram of the structure of the threshing chamber;

[0035] Figure 10 for Figure 2 Schematic diagram of the structure of the intermediate granulation tank and the stirring device;

[0036] The components include: 1. Threshing box; 2. Pellet storage box; 3. Feed inlet; 4. Second rotary drive mechanism; 5. Feeding structure; 6. Pre-threshing section; 7. Threshing section; 8. Guide bar; 9. Discharge port; 10. Second concave sieve plate; 11. Adjustment device; 12. Agitator; 13. Third rotary drive mechanism; 14. First concave sieve plate; 15. Feed blade; 16. Feed cone; 17. Central shaft; 18. Reinforcing ribs; 19. Threshing teeth. 20. Reamed cutting tooth; 21. Pre-threshing drum; 22. Curved tooth; 23. Straight tooth; 24. Anti-clogging toothed brush; 25. Telescopic mechanism; 26. Second sieve hole; 27. Brush tooth; 28. Guide groove; 29. ​​Guide strip; 30. First sieve hole; 31. Transmission rod; 32. Transmission gear; 33. Transmission rack; 34. Top rod; 35. Humidity sensing element; 36. Agitator shaft; 37. Agitator blade; 38. Transmission protective housing; 39. Toothed rod. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are merely for the convenience of describing the invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0040] The purpose of this invention is to provide a threshing device and a combine harvester to solve the problems existing in the prior art, so that a pre-threshing section with flexible soft teeth is set before the threshing section, and threshing is carried out in two stages, making threshing cleaner and more thorough.

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] Please refer to Figures 1 to 10 This embodiment provides a rice threshing device, including a pre-threshing section 6 and a threshing section 7 connected to each other; the pre-threshing section 6 includes a pre-threshing drum 21, and flexible soft teeth are fixedly arranged on the outer peripheral surface of the pre-threshing drum 21. The flexible soft teeth are arranged radially along the radial direction of the pre-threshing drum 21; the flexible soft teeth include straight teeth 23 and curved teeth 22. The end of the curved teeth 22 away from the pre-threshing drum 21 has a curved portion, and the curved portion intersects with the straight teeth 23; there is a first threshing gap between the straight teeth 23 and the curved teeth 22, and the first threshing gap is smaller than the average diameter of the threshed product.

[0044] By setting a pre-threshing section 6 with flexible teeth in front of the threshing section 7, easily detached kernels are removed, thus pre-threshing effectively improves the threshing effect. By setting the flexible teeth in two forms—straight teeth 23 and curved teeth 22—it not only possesses the advantages of traditional flexible teeth—reducing direct impact and pressure on the kernels, thereby lowering the kernel breakage rate—but also, during the threshing rotation, the intersecting straight teeth 23 and curved teeth 22 in the flexible teeth can better generate a kneading action, removing as many kernels as possible while effectively protecting the kernel integrity.

[0045] Specifically, the straight teeth 23 and curved teeth 22 in the flexible toothed roller can be combined to form various different forms. For example, the simplest is that a straight tooth 23 and a curved tooth 22 are arranged alternately, or a flexible tooth group is composed of two curved teeth 22 and a straight tooth 23. The straight tooth 23 is located between the two curved teeth 22. The curved parts of the two curved teeth 22 are facing the straight tooth 23 and intersect with the straight tooth 23. This arrangement can increase the contact area between the curved part and the threshing product. The curved part can provide more resistance and thresh more grains. Multiple flexible tooth groups are evenly arranged on the outer circumference of the threshing roller.

[0046] The threshing section 7 includes a threshing drum connected to the drum of the pre-threshing section 6. Threshing teeth 19 are fixedly arranged circumferentially on the threshing drum. The threshing drum can be a circumferentially closed cylindrical structure, or it can be a grid-like drum formed by multiple toothed rods 39 with threshing teeth 19 surrounding it. This embodiment adopts the latter form, specifically including a central shaft 17, with multiple toothed rods 39 evenly arranged circumferentially around the central shaft 17. Multiple reinforcing ribs 18 are arranged along the axial direction of the central shaft 17, and the reinforcing ribs 18 are fixedly connected to the surrounding toothed rods 39. Each toothed rod 39 is provided with multiple threshing teeth 19, and the threshing teeth 19 on adjacent toothed rods 39 are staggered.

[0047] Below the pre-threshing section 6, a first concave sieve plate 14 is provided, on which a first sieve hole 30 is opened. The inner diameter of the first sieve hole 30 is larger than the maximum diameter of the kernels of the threshing product and smaller than the minimum diameter of the stem, so that the kernels of the threshing product can pass through while preventing the stems from passing through. Below the threshing section 7, a second concave sieve plate 10 is provided, and there is a second threshing gap between the second concave sieve plate 10 and the end of the threshing teeth 19 of the threshing section 7. The second concave sieve plate 10 is provided with a second sieve hole 26, the inner diameter of which is N times the maximum diameter of the kernels of the threshing product, where N is an integer greater than 1, so that multiple kernels of the threshing product can pass through.

[0048] The first concave sieve plate 14 and the second concave sieve plate 10 are fixedly connected end to end. When the threshing product passes through the pre-threshing section 6, a small number of easily detachable grains are pre-detached and fall through the first sieve hole 30 with a smaller aperture on the first concave sieve plate 14. Broken stalks larger than the grains are intercepted on the first concave sieve plate 14 and separated from the grains.

[0049] In a preferred embodiment, an anti-clogging toothed brush 24 is fitted along the inner contour of the first concave sieve plate 14. Telescopic mechanisms 25 are provided on the upper edges of both sides of the first concave sieve plate 14 or the second concave sieve plate 10. The moving end of the telescopic mechanism 25 is fixedly connected to the anti-clogging toothed brush 24. The telescopic mechanism 25 can adopt a conventional hydraulic telescopic rod, electric telescopic rod, or other structure, or it can achieve reciprocating motion through a guide rail slider structure, or any other structure in the prior art that can achieve the above functions. By fitting the anti-clogging toothed brush 24 along the inner contour of the first concave sieve plate 14, the telescopic mechanism 25 drives the anti-clogging toothed brush 24 to reciprocate back and forth. The brush teeth 27 on the anti-clogging toothed brush 24 scrape out the stems blocking the smaller first sieve holes 30, preventing the stems from clogging the first concave sieve plate 14 and affecting the threshing effect.

[0050] Furthermore, a guide strip 29 is provided on the side of the first concave sieve plate 14 near the anti-clogging toothed brush 24, and a guide groove 28 that cooperates with the guide strip 29 is provided on the side of the anti-clogging toothed brush 24 near the first concave sieve plate 14. By providing the guide strip 29 on the first concave sieve plate 14 and the guide groove 28 on the anti-clogging toothed brush 24, the cooperation between the guide strip 29 and the guide groove 28 can effectively improve the stability of the reciprocating motion of the anti-clogging toothed brush 24.

[0051] After passing through the pre-threshing section 6, the threshing product enters the threshing section 7. The stalks with kernels are driven by the high-speed rotating threshing teeth 19 to collide and rub against the second concave sieve plate 10, causing most of the kernels to fall off. The kernels fall through the second sieve hole 26. The diameter of the second sieve hole 26 is an integer multiple of the maximum diameter of the kernels of the threshing product, which allows more kernels to fall at the same time and avoids accumulation on the second concave sieve plate 10. The stalks are wrapped around the threshing teeth 19 and generally do not fall off. Then, they are discharged under the action of the guide strip 8 set above the inside of the threshing box 1 that surrounds the pre-threshing section 6 and the threshing section 7.

[0052] Furthermore, a cutting tooth 20 is provided at the end of the toothed rod 39 away from the pre-threshing section 6. The length of the cutting tooth 20 is greater than the length of the threshing tooth 19. The second concave screen plate 10 avoids the location of the cutting tooth 20. A discharge port 9 of the threshing device is provided at the end of the toothed rod 39 away from the pre-threshing section 6. The cutting tooth 20 is used to chop longer stems before they are discharged.

[0053] As a preferred embodiment, the device further includes an adjusting device 11 for adjusting the size of the second threshing gap. The adjusting device 11 includes a first rotary drive mechanism, a transmission rod 31, a transmission gear 32, a transmission rack 33, and a top rod 34. The transmission rod 31 is connected to the output end of the first rotary drive mechanism. Both ends of the transmission rod 31 are provided with transmission gears 32, which mesh with the transmission rack 33. The top end of the transmission rack 33 is fixedly connected to the bottom end of the top rod 34, and the top end of the top rod 34 is fixedly connected to the second concave sieve plate 10. A set of adjusting devices 11 is provided at each of the front and rear ends of the second concave sieve plate 10. The four vertices of the two sets of adjusting devices 11 are fixedly connected to the four corners of the second concave sieve plate 10. When the first concave sieve plate 14 and the second concave sieve plate 10 are fixedly connected end-to-end, the four vertices of the two sets of adjusting devices 11 are fixedly connected to the two front corners of the first concave sieve plate 14 and the two rear corners of the second concave sieve plate 10, respectively.

[0054] By setting the adjustment device 11, the first rotary drive mechanism drives the transmission rod 31 to rotate. The transmission rod 31 drives the transmission gear 32, the transmission gear 32 drives the transmission rack 33, the transmission rack 33 drives the top rod 34, and the top rod 34 drives the second concave screen plate 10 to move upward or downward, thereby changing the size of the second threshing gap between the end of the threshing teeth 19 of the threshing section 7 and the second concave screen plate 10 to adapt to the amount of product being threshed. The more product is fed, the larger the second threshing gap is, and the smaller the product is fed, the smaller the second threshing gap is, so as to achieve a more suitable threshing effect.

[0055] In this embodiment, a threshing box 1 and a storage box 2 are arranged vertically. A pre-threshing section 6 and a threshing section 7 are disposed inside the threshing box 1 and are rotatably connected to the threshing box 1. A second rotary drive mechanism 4 is disposed outside the threshing box 1, and the output end of the second rotary drive mechanism 4 is connected to the pre-threshing section 6 in a transmission connection.

[0056] Furthermore, a feeding structure 5 is provided at the end of the pre-threshing drum 21 away from the threshing drum. The feeding structure 5 includes a feeding cone 16 and feeding blades 15 spirally arranged on the outer surface of the feeding cone 16. The output end of the second rotary drive mechanism 4 is fixedly connected to the feeding cone 16, which is fixedly connected to the pre-threshing drum 21. By driving the feeding cone 16 to rotate, the pre-threshing drum 21 is driven to rotate. The threshing box 1 is provided with a feeding port 3 corresponding to the position of the feeding structure 5. The product to be threshed is fed into the threshing device through the feeding port 3 and carried into the pre-threshing section 6 by the rotating feeding cone 16 and the spirally arranged feeding blades 15. The spirally arranged feeding blades 15 can ensure the flowability of the product to be threshed.

[0057] Inside the threshing chamber 1, at the top, is a guide strip 8 for discharging straw. The guide strip 8 is arranged in a semi-spiral form inside the threshing chamber 1. A semi-spiral refers to a spiral formed on the inner wall of a complete cylinder or hollow polygonal column. A full spiral is formed by cutting off half of the full spiral along a plane passing through the center line of the cylinder or hollow column; the remaining half is the semi-spiral. The semi-spiral guide strip 8 facilitates better threshing and sorting, while ensuring the flow of straw within the threshing chamber 1, feeding the straw into the discharge port 9 at the tail end of the threshing section 7.

[0058] The grain storage box 2 is located below the threshing box 1. Grains threshed by the pre-threshing section 6 or the threshing section 7 fall into the grain storage box 2 after passing through the first sieve hole 30 or the second sieve hole 26. An agitator 12 is installed inside the grain storage box 2. The agitator 12 includes an agitator shaft 36 and agitator blades 37, the agitator blades 37 being spiral blades arranged in a spiral shape around the agitator shaft 36. A third rotary drive mechanism 13 is installed outside the grain storage box 2, and the output end of the third rotary drive mechanism 13 is connected to the agitator 12. By installing the agitator 12 inside the grain storage box 2, and allowing the agitator 12 to rotate under the drive of the third rotary drive mechanism 13, the grains stored in the grain storage box 2 can be agitated, ensuring even distribution within the grain storage box 2 and preventing the fallen grains from accumulating in one place, thus affecting the effectiveness of the first concave sieve plate 14 and / or the second concave sieve plate 10. By controlling the forward and reverse rotation of the third rotary drive mechanism 13, the grains in the grain storage box 2 can be moved to the left or right. When too many grains accumulate on one side, the grains can be pushed to the other side, or the grains can be moved repeatedly in both directions to ensure the uniformity of the grain distribution in the grain storage box 2.

[0059] In a preferred embodiment, a humidity sensing element 35 is provided on the feeding side of the pre-threshing section 6, which in this embodiment is the feeding port 3 of the threshing box. The humidity sensing element 35 is signal-connected to the second rotary drive mechanism 4. By providing a humidity sensing element 35 on the feeding side of the pre-threshing section 6 and signal-connecting the humidity sensing element 35 to the second rotary drive mechanism 4 used to drive the pre-threshing section 6 and the threshing section 7 to rotate, the rotation speed of the second rotary drive mechanism 4 can be changed according to the humidity of the feeding product. When the humidity is high, the rotation speed is reduced to avoid damaging the grains, and when the humidity is low, the rotation speed is increased to improve the threshing efficiency.

[0060] A transmission protection housing 38 is provided inside the storage box. The adjustment device 11 for adjusting the second threshing gap is located inside the transmission protection housing 38 to prevent the grains inside the storage box from affecting the adjustment device 11. The first rotary drive mechanism in the adjustment device 11 can be located inside or outside the storage box. The transmission rod 31 is rotatably mounted on the side wall of the storage box.

[0061] Furthermore, this embodiment also includes a controller, and the humidity sensing element 35, the first rotary drive mechanism, the second rotary drive mechanism 4, and the third rotary drive mechanism 13 are all signal-connected to the controller. The humidity sensing element 35 can be a humidity sensor, a temperature and humidity sensor, or any other element capable of humidity detection. The first rotary drive mechanism, the second rotary drive mechanism 4, and the third rotary drive mechanism 13 can be motors.

[0062] The working process of this embodiment is as follows:

[0063] Taking ratooning rice as an example, this embodiment is installed on a ratooning rice combine harvester. Before harvesting, the amount of ratooning rice to be fed can be judged based on experience. The controller controls the second rotary drive mechanism 4 to rotate according to the amount of rice fed. Then, the adjustment device 11 controls the second concave screen plate 10, or the first concave screen plate 14 and the second concave screen plate 10, to move in the vertical direction to change the second threshing gap and achieve a better threshing effect.

[0064] During the harvesting process, the regenerated rice enters the device through the feed inlet 3. The humidity sensing element 35 at the feed inlet 3 detects the humidity of the regenerated rice and transmits a signal to the controller. The controller controls the second rotary drive mechanism 4 to change the rotation speed of the pre-threshing section 6 and the threshing section 7 according to the humidity data, so as to achieve a better threshing effect.

[0065] Regenerated rice is fed into the pre-threshing section 6 through the feeding structure 5. The rice grains are threshed by the kneading action generated by the oscillation of the flexible soft teeth. The threshed rice grains fall into the grain storage box 2 through the first concave screen plate 14. The first screen hole 30 on the first concave screen plate 14 is very small to prevent stalks from falling into the grain storage box 2. During the threshing process, in order to prevent stalks from clogging the first concave screen plate 14, the telescopic mechanism 25 drives the anti-clogging toothed brush 24 to move back and forth along the guide bar 29 through the guide groove 28. The brush teeth 27 on the anti-clogging toothed brush 24 scrape out the stalks that are blocked in the first screen hole 30 and bring them to the threshing section 7. The threshing teeth 19 then roll out the stalks for threshing. The threshed rice grains fall into the grain storage box 2 through the second concave screen plate 10. The threshed stalks are discharged from the discharge port 9 at the rear of the threshing box 1. During the threshing process, the third rotary drive mechanism 13 rotates, driving the stirring device 12 to rotate. The stirring device 12 can make the rice grains evenly distributed in the rice grain box, preventing the rice grains from accumulating in one place and clogging the concave screen plate, thus affecting the threshing effect.

[0066] Of course, in addition to ratooning rice, this embodiment can also be applied to other agricultural products, such as rice, wheat, millet and other spike crops.

[0067] Example 2

[0068] This embodiment provides a combine harvester, including the rice threshing device described in Embodiment 1.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0070] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0071] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0072] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0073] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0074] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0075] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A rice threshing device, characterized in that: The device includes a pre-threshing section and a threshing section arranged sequentially. The pre-threshing section includes a pre-threshing roller, on the outer circumferential surface of which flexible soft teeth are fixedly arranged. The flexible soft teeth are arranged radially along the radial direction of the pre-threshing roller. The flexible soft teeth include straight teeth and curved teeth. The curved teeth have a curved portion at the end away from the pre-threshing roller, and the curved portion intersects with the straight teeth. There is a first threshing gap between the straight teeth and the curved teeth, and the first threshing gap is smaller than the average diameter of the threshed product. The intersecting straight teeth and the curved teeth can better generate a kneading action.

2. The rice threshing device according to claim 1, characterized in that: Each pair of curved teeth and one straight tooth form a flexible tooth group, with the straight tooth located between the two curved teeth. The curved portions of the two curved teeth face the straight tooth and intersect with it.

3. The rice threshing device according to claim 1, characterized in that: The threshing section includes a threshing drum connected to the pre-threshing section drum, and the pre-threshing drum is circumferentially fixedly provided with threshing teeth.

4. The rice threshing device according to claim 1, characterized in that: A first concave sieve plate is provided below the pre-threshing section. The first concave sieve plate has a first sieve hole. The inner diameter of the first sieve hole is larger than the maximum diameter of the grains of the threshing product and smaller than the minimum diameter of the stem. A second concave sieve plate is provided below the threshing section. There is a second threshing gap between the second concave sieve plate and the threshing section. The second concave sieve plate has a second sieve hole. The inner diameter of the second sieve hole is N times the maximum diameter of the grains of the threshing product, where N is an integer greater than 1.

5. The rice threshing device according to claim 4, characterized in that: It also includes an adjustment device for adjusting the size of the second threshing gap. The adjustment device includes a first rotary drive mechanism, a transmission rod, a transmission gear, a transmission rack, and a top rod. The transmission rod is connected to the output end of the first rotary drive mechanism. Transmission gears are provided at both ends of the transmission rod. The gears mesh with the transmission rack. The top end of the transmission rack is fixedly connected to the bottom end of the top rod. The top end of the top rod is fixedly connected to the second concave sieve plate.

6. The rice threshing device according to claim 4, characterized in that: An anti-clogging toothed brush is fitted along the inner contour of the first concave sieve plate. A telescopic mechanism is provided on the upper edges of both sides of the first or second concave sieve plate, and the moving end of the telescopic mechanism is fixedly connected to the anti-clogging toothed brush. The first concave sieve plate is provided with a guide strip on the side near the anti-clogging toothbrush, and the anti-clogging toothbrush is provided with a guide groove that cooperates with the guide strip on the side near the first concave sieve plate.

7. The rice threshing device according to claim 1, characterized in that: The pre-threshing drum has a feeding structure fixedly installed at one end away from the threshing drum. The feeding structure includes a feeding cone and feeding blades spirally arranged on the outer surface of the feeding cone.

8. The rice threshing apparatus according to any one of claims 1-7, characterized in that: It also includes a threshing box and a storage box arranged vertically; the pre-threshing section and the threshing section are arranged inside the threshing box and are rotatably connected to the threshing box; a second rotary drive mechanism is arranged outside the threshing box, and the output end of the second rotary drive mechanism is drivenly connected to the pre-threshing section; an agitation device is arranged inside the storage box, and a third rotary drive mechanism is arranged outside the storage box, and the output end of the third rotary drive mechanism is drivenly connected to the agitation device.

9. The rice threshing device according to claim 8, characterized in that: A humidity sensing element is provided on the feed side of the pre-de-granulation section, and the humidity sensing element is signal-connected to the second rotary drive mechanism.

10. A combine harvester, characterized in that: The rice threshing apparatus includes any one of claims 1-9.

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