Adjustable flexible threshing device for a wheat combine

Abstract

The application discloses a flexible threshing device with adjustable threshing box of a wheat combine harvester, which comprises the threshing box, a transmission shaft one is horizontally arranged at the upper end of the threshing box, and a threshing mechanism is arranged at the middle part of the transmission shaft one. When threshing, the wheat combine harvester throws the wheat into the inlet of the left upper end of the threshing box through the conveying belt, the spiral feeding frame sends the wheat into the space between the two guide plates, when the transmission shaft one rotates, the fixed disc at the middle part drives the cutter to rotate through the lateral rods at the two sides, the cutter slides along the arc-shaped groove at the inner wall of the middle part of the two guide plates, and the guide plates can be expanded, when the two cutters move to the horizontal angle, the two guide plates are reset, with the timed expansion of the guide plates and the cutting of the long wheat in the rotating process of the cutter, the entering wheat cannot be blocked, and the wheat is threshed by the flexible threshing head outside the fixed disc, so that the threshing efficiency is improved, and the blockage during feeding is avoided.

Description

Technical Field

[0001] This invention relates to the field of wheat harvesting, specifically to an adjustable flexible threshing device for a wheat combine harvester. Background Technology

[0002] Wheat is an important cereal crop, belonging to the genus Triticum in the family Poaceae. It is one of the world's major food crops, widely cultivated in many countries and regions across continents. In short, as a globally important food crop, wheat plays a vital role in human food security and economic development, and its widespread cultivation and diverse uses give it an important position in global agriculture.

[0003] Wheat combine harvesters reduce losses during harvesting, which is one of the important ways to reduce grain loss and increase yield. Threshing is a key step in wheat harvesting, and the performance of the threshing device determines the performance of the combine harvester, affecting the loss rate and breakage rate of wheat.

[0004] Currently, the threshing devices used with existing wheat combine harvesters on the market have a fixed internal space that cannot be adjusted during threshing. This can easily cause blockages during the wheat feeding process, slowing down the feeding speed and ultimately affecting the threshing efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustable flexible threshing device for a wheat combine harvester to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An adjustable flexible threshing device for a wheat combine harvester, comprising:

[0008] threshing box;

[0009] A drive shaft is horizontally arranged on the inner side of the upper end of the threshing box, and a threshing mechanism is arranged in the middle of the drive shaft. An expansion mechanism is arranged at both the upper and lower ends of the threshing box near the threshing mechanism.

[0010] A transmission housing is provided on the left side of the threshing box, and a drive mechanism is provided inside the transmission housing. A spiral feeder and a feeding plate are respectively provided on the left and right sides of the transmission shaft.

[0011] A vibration mechanism is provided inside the threshing box on the side near the transmission housing, and a lifting mechanism is provided at the upper end of the threshing box near the vibration mechanism.

[0012] Furthermore, the drive mechanism includes a motor, which is fixedly installed on the upper left side of the transmission housing. The upper and lower ends of the transmission housing are respectively provided with a drive wheel and a driven wheel. The drive wheel and the driven wheel are movably connected by a belt. The output shaft of the motor is fixedly connected to the drive wheel, and the driven wheel is fixedly connected to the transmission shaft.

[0013] Furthermore, the threshing mechanism includes fixed discs arranged side by side on the outer side of the middle of the drive shaft. Several crossbars are arranged at equal arcs between the outer rings of the fixed discs, and several flexible threshing heads are arranged at equal arcs on the outer walls of the fixed discs.

[0014] Furthermore, the expansion mechanism includes a cutter, with cutters provided on the outer sides of the middle portion of the crossbars on both sides. The cutter ends are arc-shaped. Guide plates are movably installed on the upper and lower ends of the threshing box near the fixed discs. Spring rods connected to the guide plates are provided at the four corners of the upper and lower ends of the middle portion of the threshing box. An arc-shaped groove is formed inward in the middle portion of the guide plate. A guide groove is formed through the inner side of the middle portion of the threshing box.

[0015] Furthermore, the vibration mechanism includes a support frame, which is located on the lower left side inside the threshing box. A vibrating disc is movably installed inside the right side of the support frame. A partition is fixedly installed on the right side inside the threshing box. A through groove is opened in the middle of the partition. A sieve plate is movably installed at the bottom of the through groove via a rotating shaft. The other end of the sieve plate is close to the top of the vibrating disc.

[0016] Furthermore, the vibration mechanism also includes a bevel gear one, which is disposed between the transmission shaft one and the driven wheel. The transmission housing is movably mounted with bevel gear two via the transmission shaft two near the lower part of bevel gear one. A bevel gear three is disposed at the lower end of the transmission shaft two. A bevel gear four is horizontally disposed inside the lower part of the transmission housing. The bevel gear four meshes with the bevel gear three, and the bevel gear one meshes with the bevel gear two.

[0017] Furthermore, the vibration mechanism further includes a first synchronous wheel, which is located at the other end of the fourth bevel gear. One end of the vibrating disc is fixedly mounted with a second synchronous wheel through the bracket. The second synchronous wheel and the first synchronous wheel are movably connected by a synchronous belt. The threshing box is provided with a discharge port near the bottom of the screen plate, and rectifier covers are provided on both sides of the threshing box near the discharge port.

[0018] Furthermore, the lifting mechanism includes an electric push rod, which is disposed on the upper end of the threshing box near the support, and a lifting plate is provided at the output shaft end of the electric push rod.

[0019] Furthermore, a helical spring is further provided on the upper right side of the lifting plate, with the top end of the helical spring movably positioned on the lower left side of the sieve plate. A baffle is provided on the outer side of the top end of the sieve plate, and an opening is provided on the side of the baffle near the through groove.

[0020] Furthermore, a bottom groove is provided on the upper right side of the threshing box, and a waste discharge port is provided on the outer side of the bottom right side of the threshing box. A second helical spring is provided on the upper left side of the partition plate, and a lifting plate is movably installed on the bottom end of the second helical spring. The lifting plate is movably disposed on the upper right side of the screen plate.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] In this invention, during threshing, the wheat combine harvester feeds wheat through the inlet at the upper left side of the threshing box via a conveyor belt. The spiral feeder then feeds the wheat between two guide plates. When the drive shaft rotates, the fixed plate in the middle drives the cutter to rotate via crossbars on both sides. As the cutter slides along the arc-shaped groove on the inner wall of the two guide plates, it can open the guide plates. When the two cutters move to a horizontal angle, the two guide plates return to their original positions. As the guide plates expand periodically and the cutter rotates, it can cut longer wheat pieces, preventing the incoming wheat from causing blockages. At the same time, the wheat is threshed by the flexible threshing head on the outside of the fixed plate, thereby improving threshing efficiency and avoiding blockages during feeding.

[0023] When the motor of this invention starts, bevel gear one drives bevel gear two to rotate. Bevel gear two drives bevel gear three to rotate through transmission shaft two. Bevel gear three drives bevel gear four to rotate. Bevel gear four is driven by synchronous pulley one, synchronous pulley two and synchronous belt to control the high-speed rotation of the vibrating disc inside the right side of the support. When the vibrating disc rotates, it vibrates the screen plate. The wheat grains and small-volume wheat straw that fall on the screen plate are screened. The wheat grains are discharged from the feed port below, while the small-volume wheat straw that is crushed is retained on the screen plate, thereby achieving the purpose of easy screening.

[0024] After the wheat is threshed, the electric push rod is activated. The electric push rod lifts the left side of the screen plate through the lifting plate and the first helical spring. Since the right side of the screen plate is movably connected to the trough through the rotating shaft, the left side of the screen plate is lifted, which at the same time lifts the lifting plate and drives the lifting plate to compress the second helical spring until the lifting plate is locked onto the baffle. At this time, because the screen plate is tilted, the small volume of wheat straw trapped on it will slide down to the waste discharge port on the right side and be discharged, thereby facilitating waste discharge. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of an adjustable flexible threshing device for a wheat combine harvester according to the present invention.

[0026] Figure 2 This is a front view schematic diagram of the guide plate structure of an adjustable flexible threshing device for a wheat combine harvester according to the present invention;

[0027] Figure 3 This invention relates to an adjustable flexible threshing device for a wheat combine harvester. Figure 1 An enlarged view of point A in the diagram;

[0028] Figure 4 This invention relates to an adjustable flexible threshing device for a wheat combine harvester. Figure 1 Enlarged diagram of point B in the diagram;

[0029] Figure 5 This invention relates to an adjustable flexible threshing device for a wheat combine harvester. Figure 1 Enlarged view of point C in the diagram;

[0030] Figure 6 This invention relates to an adjustable flexible threshing device for a wheat combine harvester. Figure 2 An enlarged diagram of point D in the diagram.

[0031] In the diagram: 1. Threshing box; 2. Drive shaft one; 3. Drive housing; 4. Screw feeder; 5. Feeding plate; 6. Motor; 7. Drive wheel; 8. Driven wheel; 9. Fixed plate; 10. Crossbar; 11. Flexible threshing head; 12. Cutter; 13. Guide plate; 14. Spring rod; 15. Arc groove; 16. Guide trough; 17. Support; 18. Vibrating plate; 19. Partition plate; 20. Through groove; 21. Screen plate; 22. Bevel gear one; 23. Drive shaft two; 24. Bevel gear two; 25. Bevel gear three; 26. Bevel gear four; 27. Synchronous pulley one; 28. Synchronous pulley two; 29. ​​Electric push rod; 30. Lifting plate; 31. Helical spring one; 32. Bottom trough; 33. Waste discharge port; 34. Discharge port; 35. Radiator; 36. Helical spring two; 37. Lifting plate; 38. Baffle. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0033] like Figure 1-6 As shown, the present invention provides a technical solution:

[0034] An adjustable flexible threshing device for a wheat combine harvester includes a threshing box 1; a drive shaft 2 is laterally arranged on the inner side of the upper end of the threshing box 1; a spiral feeding frame 4 and a feeding plate 5 are respectively arranged on the left and right sides of the drive shaft 2; a threshing mechanism is arranged in the middle of the drive shaft 2; the threshing mechanism includes fixed disks 9, which are arranged side by side on the outer side of the middle of the drive shaft 2; a plurality of crossbars 10 are arranged at equal arcs between the outer rings of the fixed disks 9; a plurality of flexible threshing heads 11 are arranged at equal arcs on the outer walls of the fixed disks 9; a transmission shell 3 is arranged on the outer left side of the threshing box 1; a drive mechanism is arranged inside the transmission shell 3; the drive mechanism includes a motor 6, which is fixedly installed on the upper outer left side of the transmission shell 3; the transmission shell 3... The upper and lower ends of the threshing box 1 are respectively provided with a driving wheel 7 and a driven wheel 8. The driving wheel 7 and the driven wheel 8 are movably connected by a belt. The output shaft of the motor 6 is fixedly connected to the driving wheel 7, and the driven wheel 8 is fixedly connected to the transmission shaft 2. The upper and lower ends of the threshing box 1 near the threshing mechanism are provided with an expansion mechanism. The expansion mechanism includes a cutter 12. The cutter 12 is provided on the outer side of the middle part of the crossbars 10 on both sides. The end of the cutter 12 is arc-shaped. The upper and lower ends of the threshing box 1 near several fixed discs 9 are movably installed with guide plates 13. The four corners of the upper and lower ends of the middle part of the threshing box 1 are provided with spring rods 14 that are movably connected to the guide plates 13. The middle part of the guide plate 13 is provided with an arc-shaped groove 15. The middle inner side of the threshing box 1 is provided with a guide groove 16.

[0035] In this embodiment, during threshing, the wheat combine harvester feeds wheat into the feed port at the upper left side of the threshing box 1 via a conveyor belt and starts the motor 6. The motor 6 controls the rotation of the drive shaft 2 through the drive wheel 7, driven wheel 8, and belt drive. The drive shaft 2 drives the spiral feeder 4, fixed plate 9, and feed plate 5 to rotate simultaneously. The spiral feeder 4 feeds the incoming wheat between the two guide plates 13. When the drive shaft 2 rotates, the fixed plate 9 in the middle position drives the cutter 12 to rotate through the crossbars 10 on both sides. When the cutter 12 slides along the arc groove 15 on the inner wall of the middle of the two guide plates 13, it can open the guide plates 13. When the two cutters 12 move to the horizontal angle, the two guide plates 13 return to their original position. As the guide plates 13 expand periodically and the cutter 12 rotates, it can cut longer wheat. The incoming wheat will not cause blockage. At the same time, the wheat is threshed by the flexible threshing head 11 on the outside of the fixed plate 9, thereby improving the threshing efficiency and avoiding blockage during feeding.

[0036] like Figure 1 and Figure 4As shown, a vibration mechanism is installed inside the threshing box 1 near the transmission housing 3. The vibration mechanism includes a bracket 17, which is located on the lower left side inside the threshing box 1. A vibrating disc 18 is movably installed inside the right side of the bracket 17. A partition 19 is fixedly installed on the right side inside the threshing box 1. A through groove 20 is opened in the middle of the partition 19. A screen plate 21 is movably installed at the bottom of the through groove 20 via a rotating shaft. The other end of the screen plate 21 is located near the top of the vibrating disc 18. The vibration mechanism also includes a bevel gear 22, which is located between the transmission shaft 2 and the driven wheel 8. The transmission housing 3 is located below the bevel gear 22 via a transmission shaft 23. The transmission shaft 23 is equipped with a bevel gear 24, and the lower end of the transmission shaft 23 is equipped with a bevel gear 25. The transmission housing 3 is horizontally arranged inside the lower part of the transmission shaft 24 with a bevel gear 26. The bevel gear 26 meshes with the bevel gear 325, and the bevel gear 12 meshes with the bevel gear 24. The vibration mechanism further includes a synchronous wheel 27, which is located at the other end of the bevel gear 426. One end of the vibrating plate 18 passes through the bracket 17 and is fixedly installed with a synchronous wheel 28. The synchronous wheel 28 and the synchronous wheel 127 are movably connected by a synchronous belt. The threshing box 1 is provided with a discharge port 34 near the lower part of the screen plate 21. The threshing box 1 is provided with a rectifier 35 on both sides near the discharge port 34.

[0037] In this embodiment, when the motor 6 starts, bevel gear 1 22 drives bevel gear 24 to rotate. Bevel gear 24 drives bevel gear 3 25 to rotate through transmission shaft 2 23. Bevel gear 3 25 drives bevel gear 4 26 to rotate. Bevel gear 4 26 is driven by synchronous pulley 1 27, synchronous pulley 2 28 and synchronous belt. The vibration plate 18 inside the right side of the control bracket 17 rotates at high speed. When the vibration plate 18 rotates, it vibrates the screen plate 21. The wheat grains and small-volume wheat straw that fall on the screen plate 21 are screened. The wheat grains are discharged from the feed port 34 below, while the small-volume wheat straw that is crushed is retained on the screen plate 21, thereby achieving the purpose of easy screening.

[0038] like Figure 6 As shown, a lifting mechanism is provided at the upper end of the threshing box 1 near the vibration mechanism. The lifting mechanism includes an electric push rod 29, which is located at the upper end of the side of the threshing box 1 near the support 17. A lifting plate 30 is provided at the output shaft end of the electric push rod 29. A spiral spring 31 is further provided at the upper right side of the lifting plate 30. The top end of the spiral spring 31 is movably located at the lower left side of the screen plate 21. A baffle 38 is provided on the outer side of the top end of the screen plate 21. An opening is provided on the side of the baffle 38 near the through groove 20. A bottom groove 32 is provided on the upper right side of the interior of the threshing box 1. A waste discharge port 33 is provided on the outer side of the bottom right side of the threshing box 1. A spiral spring 36 is provided at the upper left side of the partition plate 19. A lifting plate 37 is movably installed at the bottom end of the spiral spring 36. The lifting plate 37 is movably located on the upper right side of the screen plate 21.

[0039] In this embodiment, after the wheat is threshed, the electric push rod 29 is activated. The electric push rod 29 lifts the left side of the screen plate 21 through the lifting plate 30 and the spiral spring 31. Since the right side of the screen plate 21 is connected to the through groove 20 through a rotating shaft, the left side of the screen plate 21 is lifted, which at the same time lifts the lifting plate 37 and drives the lifting plate 37 to compress the spiral spring 36 until the lifting plate 37 is engaged with the baffle 38. At this time, since the screen plate 21 is tilted, the small volume of wheat straw trapped on it will slide down to the waste discharge port 33 on the right side and be discharged, thereby facilitating waste discharge.

[0040] Working principle: During threshing, the wheat combine harvester feeds wheat into the feed port at the upper left side of the threshing box 1 via a conveyor belt, and starts the motor 6. The motor 6 controls the rotation of the drive shaft 2 through the drive wheel 7, driven wheel 8, and belt drive. The drive shaft 2 drives the spiral feeder 4, the fixed plate 9, and the feed plate 5 to rotate simultaneously. The spiral feeder 4 feeds the incoming wheat between the two guide plates 13. When the drive shaft 2 rotates, the fixed plate 9 in the middle drives the cutter 12 to rotate through the crossbars 10 on both sides. The cutter 12 moves along the two guide plates 13. When the arc-shaped groove 15 on the inner wall of the middle slides, it can expand the guide plate 13. When the two cutters 12 move to a horizontal angle, the two guide plates 13 return to their original positions. As the guide plates 13 expand periodically and the cutters 12 rotate, they can cut longer wheat grains. The wheat entering the box will not cause blockage. At the same time, the wheat is threshed by the flexible threshing head 11 on the outside of the fixed plate 9. The wheat grains fall from the guide trough 16 onto the screen plate 21 below, while the wheat stalks are fed into the right side of the threshing box 1 by the feeding plate 5, and then discharged from the waste outlet 33 through the bottom trough 32. Simultaneously with startup, bevel gear 1 22 drives bevel gear 24 to rotate. Bevel gear 2 24 drives bevel gear 3 25 to rotate via transmission shaft 2 23. Bevel gear 3 25 drives bevel gear 4 26 to rotate. Bevel gear 4 26 is driven by synchronous pulley 1 27, synchronous pulley 2 28, and synchronous belt. This drives the vibrating disc 18 inside the right side of the control bracket 17 to rotate at high speed. When the vibrating disc 18 rotates, it vibrates the screen plate 21. The wheat grains and small-volume crushed wheat straw falling on the screen plate 21 are screened. The wheat grains are discharged from the feed port 34 below, while the small-volume crushed wheat straw is screened. Small-volume wheat straw is trapped on the sieve plate 21. After the wheat is threshed, the electric push rod 29 is activated. The electric push rod 29 lifts the left side of the sieve plate 21 through the lifting plate 30 and the spiral spring 31. Since the right side of the sieve plate 21 is connected to the through groove 20 through a rotating shaft, the left side of the sieve plate 21 is lifted, which at the same time lifts the lifting plate 37 and drives the lifting plate 37 to compress the spiral spring 36 until the lifting plate 37 is locked onto the baffle 38. At this time, because the sieve plate 21 is tilted, the small-volume wheat straw trapped on it will slide down to the waste discharge port 33 on the right side and be discharged.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable flexible threshing device for a wheat combine harvester, characterized in that: include Threshing box (1); A drive shaft (2) is horizontally arranged on the inner side of the upper end of the threshing box (1), and a threshing mechanism is arranged in the middle of the drive shaft (2). An expansion mechanism is arranged at both the upper and lower ends of the threshing box (1) near the threshing mechanism. The threshing box (1) is provided with a transmission shell (3) on the left side outside, and a drive mechanism is provided inside the transmission shell (3). The left and right sides of the transmission shaft (2) are respectively provided with a spiral feeder (4) and a feeding plate (5). The threshing box (1) is provided with a vibration mechanism inside the side near the transmission housing (3), and the threshing box (1) is provided with a lifting mechanism at the upper end near the vibration mechanism. The drive mechanism includes a motor (6), which is fixedly installed on the upper left side of the transmission housing (3). The transmission housing (3) has a drive wheel (7) and a driven wheel (8) respectively at its upper and lower ends. The drive wheel (7) and the driven wheel (8) are movably connected by a belt. The output shaft of the motor (6) is fixedly connected to the drive wheel (7), and the driven wheel (8) is fixedly connected to the transmission shaft (2). The threshing mechanism includes a fixed disk (9), which is arranged side by side on the outer side of the middle of the transmission shaft (2). A number of crossbars (10) are arranged at equal arcs between the outer rings of the fixed disks (9), and a number of flexible threshing heads (11) are arranged at equal arcs on the outer walls of the fixed disks (9). The expansion mechanism includes a cutter (12), and cutters (12) are provided on the outer side of the middle part of the crossbars (10) on both sides. The ends of the cutters (12) are arc-shaped. Guide plates (13) are movably installed on the upper and lower ends of the threshing box (1) near the fixed plates (9). Spring rods (14) that are movably connected to the guide plates (13) are provided at the four corners of the upper and lower ends of the middle part of the threshing box (1). An arc-shaped groove (15) is opened inward in the middle part of the guide plate (13). A guide groove (16) is opened through the inner side of the middle part of the threshing box (1). During threshing, the wheat combine harvester feeds wheat into the feed port at the upper left side of the threshing box (1) via a conveyor belt and starts the motor (6). The motor (6) controls the rotation of the drive shaft (2) through the drive wheel (7), driven wheel (8) and belt drive. The drive shaft (2) drives the screw feeder (4), fixed plate (9) and feed plate (5) to rotate simultaneously. The screw feeder (4) feeds the incoming wheat between the two guide plates (13). When the drive shaft (2) rotates, the fixed plate (9) in the middle position is driven by the crossbars (10) on both sides. When the cutter (12) rotates and slides along the arc groove (15) on the inner wall of the middle of the two guide plates (13), it can open the guide plates (13). When the two cutters (12) move to the horizontal angle, the two guide plates (13) reset. As the guide plates (13) expand at regular intervals, and the cutter (12) rotates, it can cut long wheat. The wheat entering will not cause blockage. At the same time, the wheat is threshed by the flexible threshing head (11) on the outside of the fixed plate (9), which can improve the threshing efficiency and avoid blockage during feeding.

2. The adjustable flexible threshing device for a wheat combine harvester according to claim 1, characterized in that: The vibration mechanism includes a bracket (17), which is located on the lower left side inside the threshing box (1). A vibrating plate (18) is movably installed inside the right side of the bracket (17). A partition (19) is fixedly installed inside the right side of the threshing box (1). A through groove (20) is provided in the middle of the partition (19). A sieve plate (21) is movably installed at the bottom of the through groove (20) through a rotating shaft. The other end of the sieve plate (21) is close to the top of the vibrating plate (18).

3. The adjustable flexible threshing device for a wheat combine harvester according to claim 2, characterized in that: The vibration mechanism also includes a bevel gear one (22), which is disposed between the transmission shaft one (2) and the driven wheel (8). The transmission housing (3) is movably mounted with a bevel gear two (24) near the lower part of the bevel gear one (22) via a transmission shaft two (23). A bevel gear three (25) is disposed at the lower end of the transmission shaft two (23). A bevel gear four (26) is disposed horizontally inside the lower part of the transmission housing (3). The bevel gear four (26) meshes with the bevel gear three (25), and the bevel gear one (22) meshes with the bevel gear two (24).

4. The adjustable flexible threshing device for a wheat combine harvester according to claim 3, characterized in that: The vibration mechanism further includes a first synchronous wheel (27), which is located at the other end of the fourth bevel gear (26). One end of the vibrating plate (18) passes through the bracket (17) and is fixedly installed with a second synchronous wheel (28). The second synchronous wheel (28) and the first synchronous wheel (27) are movably connected by a synchronous belt. The threshing box (1) is provided with a discharge port (34) below the screen plate (21). The threshing box (1) is provided with shrouds (35) on both sides near the discharge port (34).

5. The adjustable flexible threshing device for a wheat combine harvester according to claim 1, characterized in that: The lifting mechanism includes an electric push rod (29), which is located on the upper end of the threshing box (1) near the support (17), and a lifting plate (30) is provided at the output shaft end of the electric push rod (29).

6. The adjustable flexible threshing device for a wheat combine harvester according to claim 5, characterized in that: A spiral spring (31) is further provided on the upper right side of the lifting plate (30). The top end of the spiral spring (31) is movably located on the lower left side of the sieve plate (21). A baffle (38) is provided on the outer side of the top end of the sieve plate (21). An opening is provided on the side of the baffle (38) near the through groove (20).

7. The adjustable flexible threshing device for a wheat combine harvester according to claim 2, characterized in that: The upper right side of the threshing box (1) is provided with a bottom groove (32), and the bottom right side of the threshing box (1) is provided with a waste discharge port (33). The upper left side of the partition plate (19) is provided with a spiral spring (36), and the bottom of the spiral spring (36) is movably installed with a lifting plate (37). The lifting plate (37) is movably disposed on the upper right side of the sieve plate (21).

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