Double-layer vibration sorting sieve of wheat combine harvester

Abstract

The invention discloses a double-layer vibration sorting sieve of a wheat combine harvester, and relates to the technical field of agricultural machinery. The supporting plate is assembled on one side of the upper end of the base and used for guiding in materials; the locking ring is assembled at the upper end of the base, and a screening barrel is rotationally arranged on the inner wall of the locking ring; according to the double-layer vibration sorting screen of the wheat combine harvester, materials in the screening barrel are pushed through the protection assembly, so that the materials can rapidly pass through the screen, the residence time is shortened, it is ensured that the materials smoothly pass through the screen, the frequency of shutdown and manual intervention caused by screen blockage is reduced, meanwhile, adjustment can be conducted according to the characteristics of the materials, and the working efficiency is improved. The material pushing device is suitable for drying loose materials, can effectively process materials with high wetness and viscidity, and can ensure that special materials smoothly pass through a screen through proper pushing force and frequency.

Description

Technical Field

[0001] This invention relates to agricultural machinery technology, specifically to a double-layer vibrating cleaning screen for a wheat combine harvester. Background Technology

[0002] A combine harvester is a machine that can simultaneously complete various operations such as harvesting, threshing, separating, and cleaning grains to ultimately obtain clean grains. Using a combine harvester can greatly improve labor productivity and reduce labor intensity. According to different power configurations, they can be divided into towed, self-propelled, and suspended types. The combine harvester integrates harvesting, threshing, and cleaning into a single operation, allowing farmers to complete harvesting, threshing, and cleaning with a single operation, thereby saving manpower and resources and greatly reducing the burden on farmers.

[0003] Chinese invention patent CN120304173A discloses a harvester cleaning system with multi-stage cleaning function. This system includes a primary cleaning fan, a cleaning vibrating plate, a secondary cleaning fan, a stepped plate, and a reciprocating vibrating screen. The primary cleaning fan cleans the material between the axial flow drum and the cleaning vibrating plate. The stepped plate conveys the material threshed by the tangential flow drum and the material from the cleaning vibrating plate to the reciprocating vibrating screen. The secondary cleaning fan cleans the material conveyed to the reciprocating vibrating screen. This invention achieves graded separation of impurities through the synergistic effect of multi-stage screening and airflow separation. The multi-stage cleaning system used in this invention can process materials quickly, thereby improving operational efficiency. The cleaning vibrating plate is equipped with multiple inclined guide plates, which together form a stepped structure that gradually rises from front to back. During operation, the stepped structure can extend the material conveying path, allowing the material to be fully dispersed under the action of shaking and airflow, thereby significantly improving the separation efficiency of the primary cleaning blower for impurities.

[0004] When existing equipment is in use, if the material contains moisture or sticky substances during the screening process, it is easy for them to accumulate on the screen and form blockages, which greatly reduces the screening efficiency. At the same time, the material is prone to agglomeration during the transfer process, which can easily cause blockages at the conveying end. This not only affects production efficiency but also increases the frequency and cost of equipment maintenance. Therefore, a double-layer vibrating cleaning screen for wheat combine harvesters has been developed. Summary of the Invention

[0005] The purpose of this invention is to provide a double-layer vibrating cleaning screen for a wheat combine harvester to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a double-layer vibrating cleaning screen for a wheat combine harvester, comprising a base;

[0007] A pallet, which is assembled on one side of the upper end of the base, is used to introduce materials;

[0008] A locking ring is assembled at the upper end of the base, and a screening cylinder is rotatably provided on the inner wall of the locking ring;

[0009] A screening plate is assembled at the lower end of the base, and a pull rod is rotatably provided on one side of the screening plate. The end of the pull rod is rotatably connected to the end of the base. The screening plate is used to perform secondary screening on the material after the initial screening.

[0010] A pretreatment component, which is assembled at the upper end of the pallet, is used to initially break up the clumps of material inside the conveying pipe.

[0011] A protective component, which is fitted onto the inner wall of the base and extends into the inner cavity of the screening cylinder, is used to scrape off materials that are stuck together during screening.

[0012] The protective component includes a protective ring that engages with the base, a driving component fixedly disposed on the inner wall of the protective ring, and a movable cylinder slidably disposed on the inner wall of the protective ring.

[0013] A limiting block is fixedly provided on the inner wall of the movable cylinder, while a limiting plate is rotatably provided on the outer surface of the movable cylinder;

[0014] The output end of the drive unit is fixedly provided with a rotating cylinder. The outer surface of the rotating cylinder is symmetrically provided with arc-shaped grooves. The arc-shaped grooves are X-shaped when unfolded. At the same time, the two through holes at the ends of the arc-shaped grooves are interconnected. The inner wall of the arc-shaped grooves is slidably connected to the outer surface of the limiting block.

[0015] As a further optimization of the present invention, a protective plate is fixedly provided at the end of the limiting plate, and multiple sets of protective grooves are uniformly opened on the inner wall of the protective plate.

[0016] As a further optimization of the present invention, a protective block is slidably provided on the inner wall of the protective groove, the end of the protective block penetrates and extends to the outside of the protective plate, and a pressing plate is rotatably provided on the end of the protective block, and an extension rod is fixedly provided on one side of the protective block.

[0017] As a further optimization of the present invention, a drive plate is rotatably provided at the end of the movable cylinder, and a drive groove corresponding to the extension rod is opened at the end of the drive plate. At the same time, the inner wall of the drive groove is slidably connected to the outer surface of the extension rod.

[0018] As a further optimization of the present invention, a turntable is fixedly provided at the lower end of the drive plate, the end of the turntable extends through and to the outside of the protective plate, and multiple sets of scrapers are uniformly fixedly provided at the end of the turntable, with a connecting rod slidably provided between each adjacent scraper.

[0019] As a further optimization of the present invention, the pretreatment component includes a transmission cylinder that is snapped into the base. A cylinder is fixedly provided at the upper end of the transmission cylinder, and a conveying column is rotatably provided on the inner wall of the cylinder. Multiple sets of grooves are formed on the outer surface of the conveying column.

[0020] As a further optimization of the present invention, a locking plate is fixedly provided on the inner wall of the transmission cylinder, a docking block is fixedly provided at the end of the locking plate, and a docking rod is rotatably provided at the end of the docking block.

[0021] As a further optimization of the present invention, a swing block is fixedly provided at the end of the docking rod, a rotating ring is fixedly provided on the outer surface of the swing block, a swing ring is rotatably provided on the outer surface of the rotating ring, and a movable block is symmetrically rotatably provided on the outer surface of the swing ring.

[0022] As a further optimization of the present invention, a fixing plate is fixedly provided at the upper end of the swing block, a telescopic rod is fixedly provided at the end of the fixing plate, a tapered plate is fixedly provided at the end of the telescopic rod, an elastic element is sleeved on the outer surface of the telescopic rod, one end of the elastic element is connected to the end of the telescopic rod, and the other end is connected to the end of the tapered plate.

[0023] As a further optimization of the present invention, an arc-shaped plate is symmetrically slidably disposed on the outer surface of the locking plate, and a guide groove is formed on the inner wall of the arc-shaped plate, and the inner wall of the guide groove is slidably connected to the outer surface of the movable block.

[0024] Compared with the prior art, the double-layer vibrating cleaning screen for a wheat combine harvester provided by the present invention has the following beneficial effects:

[0025] The protective components push the material inside the screening cylinder, allowing it to pass through the screen quickly, reducing residence time and ensuring smooth passage. This reduces downtime and manual intervention caused by screen blockage. The system can also be adjusted according to the material's characteristics, making it suitable not only for dry and loose materials but also for wet and sticky materials. With appropriate pushing force and frequency, even special materials can pass through the screen smoothly.

[0026] Pretreatment components can remove clumps and small impurities in the early stages, reducing the impact of defective materials on subsequent equipment. At the same time, they can significantly improve the purity and uniformity of materials, ensuring the stability of product quality during subsequent processing.

[0027] The combination of protective and pretreatment components can maintain uniform material distribution, reduce the time material remains on the screen, improve screening efficiency, enhance material flowability, reduce screen resistance, and increase material throughput. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0029] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the preprocessing component structure provided in an embodiment of the present invention;

[0031] Figure 3 This is a cross-sectional view of the internal structure of the preprocessing component provided in an embodiment of the present invention;

[0032] Figure 4 This is a first exploded view of the preprocessing component structure provided in an embodiment of the present invention;

[0033] Figure 5 This is a second exploded view of the preprocessing component structure provided in an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the protective component structure provided in an embodiment of the present invention;

[0035] Figure 7 This is a first exploded view of the protective component structure provided in an embodiment of the present invention;

[0036] Figure 8 This is a second exploded view of the protective component structure provided in an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Base; 2. Pre-treatment assembly; 3. Protective assembly; 11. Pallet; 12. Locking ring; 13. Screening cylinder; 14. Screening plate; 15. Tie rod; 21. Conveyor cylinder; 22. Cylinder; 23. Conveying column; 231. Groove; 24. Locking plate; 241. Connecting block; 25. Connecting rod; 251. Swinging block; 252. Rotating ring; 26. Swinging ring; 261. Movable block; 27. Fixed plate; 271. Telescopic rod; 272. 28. Elastic component; 29. ​​Conical plate; 29. ​​Arc plate; 291. Guide groove; 31. Protective ring; 32. Driving component; 33. Movable cylinder; 331. Limiting block; 332. Limiting plate; 34. Rotating cylinder; 341. Arc groove; 35. Driving plate; 351. Driving groove; 36. Protective plate; 361. Protective groove; 37. Protective block; 372. Pressing plate; 373. Extension rod; 38. Turntable; 381. Scraper; 382. Connecting rod. Detailed Implementation

[0039] 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.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, 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. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Example: Please refer to Figures 1-8 A double-layer vibrating cleaning screen for a wheat combine harvester includes a base 1 and a pallet 11, which is assembled on one side of the upper end of the base 1 for feeding materials.

[0042] A locking ring 12 is assembled on the upper end of the base 1, and a screening cylinder 13 is rotatably mounted on the inner wall of the locking ring 12.

[0043] The screening plate 14 is assembled at the lower end of the base 1. A pull rod 15 is rotatably provided on one side of the screening plate 14. The end of the pull rod 15 is rotatably connected to the end of the base 1. The screening plate 14 is used to perform secondary screening on the material after the initial screening.

[0044] In this design, the end of the locking ring 12 is equipped with a power output device such as a motor and is connected to an external control device. At the same time, the output end of the motor is equipped with a gear, which meshes with the outer surface of the screening cylinder 13. Thus, when the motor starts, it synchronously drives the screening cylinder 13 to rotate and screen the material.

[0045] The pull rod 15 is a component with telescopic function, such as an electric telescopic rod, and is connected to an external control device. When the electric telescopic rod is started, it drives the screening plate 14 fixedly installed at its end to rotate around the base 1, thereby performing secondary screening of the material.

[0046] Furthermore, the protective component 3, which is assembled on the inner wall of the base 1 and extends into the inner cavity of the screening cylinder 13, is used to scrape off the material that adheres to the screen; wherein, the protective component 3 includes a protective ring 31 that is snapped into the base 1, a driving component 32 is fixedly provided on the inner wall of the protective ring 31, and a movable cylinder 33 is slidably provided on the inner wall of the protective ring 31.

[0047] In this embodiment, the driving component 32 is a device with power output, such as a motor, and is connected to an external control device. When the driving component 32 is started, it drives the rotating cylinder 34, which is fixedly installed at its output end, to rotate.

[0048] The outer surface of the movable cylinder 33 is provided with a guide rail, and the outer surface of the guide rail is slidably connected to the inner wall of the protective ring 31, so that the movable cylinder 33 moves along the guide rail when it is subjected to force.

[0049] Furthermore, a limiting block 331 is fixedly provided on the inner wall of the movable cylinder 33, while a limiting plate 332 is rotatably provided on the outer surface of the movable cylinder 33.

[0050] Specifically, when the movable cylinder 33 moves, it drives the limiting plate 332, which is fitted and rotated on its outer surface, to move, and pushes the accumulated material through the limiting plate 332.

[0051] Furthermore, a rotating cylinder 34 is fixedly provided at the output end of the drive unit 32. The outer surface of the rotating cylinder 34 is symmetrically provided with arc-shaped grooves 341. The arc-shaped grooves 341 are X-shaped when unfolded. At the same time, the two through holes at the ends of the arc-shaped grooves 341 are interconnected. The inner wall of the arc-shaped grooves 341 is slidably connected to the outer surface of the limiting block 331.

[0052] Specifically, when the rotating cylinder 34 rotates, it works in conjunction with the arc-shaped groove 341 on its outer surface to drive the limiting block 331, which is slidably mounted on its inner wall, to move, thereby driving the movable cylinder 33, which is fixedly connected to the limiting block 331, to reciprocate.

[0053] Furthermore, a protective plate 36 is fixedly provided at the end of the limiting plate 332, and multiple sets of protective grooves 361 are evenly provided on the inner wall of the protective plate 36. A protective block 37 is slidably provided on the inner wall of the protective groove 361, and the end of the protective block 37 penetrates and extends to the outside of the protective plate 36. At the same time, a pressing plate 372 is rotatably provided at the end of the protective block 37, and an extension rod 373 is fixedly provided on one side of the protective block 37.

[0054] Specifically, when the protective block 37 is moved under force, it moves along the inner wall of the protective groove 361, thereby driving the pressing plate 372, which is rotated and installed at its end, to squeeze the inner wall of the screening cylinder 13, further breaking up the material piled up together.

[0055] Furthermore, a drive plate 35 is rotatably provided at the end of the movable cylinder 33. The end of the drive plate 35 is provided with a drive groove 351 corresponding to the extension rod 373. At the same time, the inner wall of the drive groove 351 is slidably connected to the outer surface of the extension rod 373.

[0056] Specifically, the upper end of the drive plate 35 is provided with a telescopic transmission rod, the end of which extends through into the interior of the movable cylinder 33 and is fixedly connected to the end of the rotating cylinder 34, so that when the rotating cylinder 34 rotates, it drives the drive plate 35 to move synchronously.

[0057] When the drive plate 35 rotates, it works in conjunction with the drive groove 351 at its end to drive the extension rod 373 to move, causing the extension rod 373 to expand outward or contract inward along the inner wall of the drive groove 351.

[0058] The telescopic transmission rod consists of a cylindrical tube with a square inner wall and a square rod. The outer surface of the square rod is slidably connected to the inner wall of the cylindrical tube to ensure the stability of the overall power transmission.

[0059] Furthermore, a turntable 38 is fixedly installed at the lower end of the drive plate 35. The end of the turntable 38 extends through and to the outside of the protective plate 36. Multiple sets of scrapers 381 are evenly fixedly installed at the end of the turntable 38. A connecting rod 382 is slidably installed between two adjacent scrapers 381.

[0060] Specifically, when the drive plate 35 rotates under force, it synchronously drives the turntable 38 fixed at its end to rotate. An elastic telescopic rod is provided between the scraper 381 and the turntable 38. The elastic telescopic rod limits the scraper 381 to ensure that the scraper 381 is in contact with the inner wall of the screening cylinder 13. The connecting rod 382, ​​which is slidably provided, limits two adjacent scrapers 381. The connecting rod 382 is slidably provided on the inner wall of the scraper 381.

[0061] Furthermore, the pretreatment component 2, which is assembled on the upper end of the pallet 11, is used to initially break up the material that is clumped inside the conveying end pipe; the pretreatment component 2 includes a conveying cylinder 21 that is snapped into the base 1, a cylinder 22 is fixedly provided on the upper end of the conveying cylinder 21, a conveying column 23 is rotatably provided on the inner wall of the cylinder 22, and multiple sets of grooves 231 are opened on the outer surface of the conveying column 23.

[0062] In this embodiment, a device with power output, such as a motor, is provided on one side of the cylinder 22 and connected to an external control device. The output end of the motor is fixedly connected to the end of the conveying column 23. The motor drives the conveying column 23 to rotate, which in turn cooperates with the groove 231 opened on its outer surface to quantitatively convey the material, avoiding excessive material accumulation inside the screening cylinder 13.

[0063] Furthermore, a locking plate 24 is fixedly provided on the inner wall of the transmission cylinder 21, a docking block 241 is fixedly provided at the end of the locking plate 24, and a docking rod 25 is rotatably provided at the end of the docking block 241.

[0064] Specifically, the locking plate 24 is provided with bolts or other fixing components at its end. The locking plate 24 is fixed to the inner wall of the transmission cylinder 21 by bolts. The locking plate 24 is provided with a motor or other power output device at its end. The output end of the motor is fixedly connected to the end of the docking rod 25, thereby driving the docking rod 25 to rotate.

[0065] Furthermore, a swing block 251 is fixedly provided at the end of the connecting rod 25, a rotating ring 252 is fixedly provided on the outer surface of the swing block 251, a swing ring 26 is rotatably provided on the outer surface of the rotating ring 252, and a movable block 261 is symmetrically rotatably provided on the outer surface of the swing ring 26.

[0066] Specifically, the docking block 241 is inclinedly disposed on the docking rod 25, so that when the docking rod 25 rotates, it drives the swing block 251 fixedly disposed at its end to rotate, and synchronously drives the rotating ring 252 fixedly disposed on its outer surface to swing.

[0067] Since the swing ring 26 is rotatably disposed on the outer surface of the rotating ring 252, it moves in conjunction with the movable block 261 rotatably disposed on the outer surface of the swing ring 26.

[0068] Furthermore, a fixed plate 27 is fixedly installed at the upper end of the swing block 251, a telescopic rod 271 is fixedly installed at the end of the fixed plate 27, a tapered plate 28 is fixedly installed at the end of the telescopic rod 271, and an elastic element 272 is sleeved on the outer surface of the telescopic rod 271. One end of the elastic element 272 is connected to the end of the telescopic rod 271, and the other end is connected to the end of the tapered plate 28.

[0069] Specifically, the telescopic rod 271 is an existing telescopic component used to limit the conical plate 28, and the elastic element 272 is a spring or other elastic component that supports the conical plate 28, allowing it to return to its initial position after being subjected to force. The conical plate 28 is made of an elastic material.

[0070] Furthermore, an arc-shaped plate 29 is symmetrically slidably arranged on the outer surface of the locking plate 24, and a guide groove 291 is provided on the inner wall of the arc-shaped plate 29. The inner wall of the guide groove 291 is slidably connected to the outer surface of the movable block 261.

[0071] Specifically, since the movable block 261 is slidably disposed on the inner wall of the guide groove 291, when the movable block 261 swings with the swing ring 26, it reciprocates to drive the two arc plates 29 to expand outward or move towards the middle, thereby breaking up the agglomerated parts of the material.

[0072] An elastic material is provided between the two arc-shaped plates 29 to fill the gap between them. At the same time, the upper end of the arc-shaped plate 29 is connected to the end of the conical plate 28, so that when the arc-shaped plate 29 moves, it pulls the conical plate 28 downward.

[0073] The control device can choose a microcontroller as the control terminal. In this embodiment, the microcontroller is a typical embedded microcontroller unit, consisting of an arithmetic logic unit (ALU), a controller, memory, input / output devices, etc., essentially a miniature computer. Compared to general-purpose microprocessors used in personal computers, it emphasizes self-sufficiency (no external hardware required) and cost savings. Its biggest advantage is its small size, allowing it to be placed inside the instrument, but it has limited storage capacity, simple input / output interfaces, and low power consumption.

[0074] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A double-layer vibrating cleaning screen for a wheat combine harvester, characterized in that, Including the base (1); A pallet (11), which is assembled on one side of the upper end of the base (1), is used to introduce materials; A locking ring (12) is fitted to the upper end of the base (1), and a screening cylinder (13) is rotatably provided on the inner wall of the locking ring (12). A screening plate (14) is assembled at the lower end of the base (1), and a pull rod (15) is rotatably provided on one side of the screening plate (14). The end of the pull rod (15) is rotatably connected to the end of the base (1). The screening plate (14) is used to perform secondary screening on the material after the initial screening. The pretreatment component (2), which is assembled on the upper end of the pallet (11), is used to initially break up the material that has clumped inside the conveying end pipe; The protective component (3), which is fitted to the inner wall of the base (1) and extends into the inner cavity of the screening cylinder (13), is used to scrape off the material that is stuck together during screening. The protective component (3) includes a protective ring (31) that is snapped into the base (1), a driving component (32) is fixedly provided on the inner wall of the protective ring (31), and a movable cylinder (33) is slidably provided on the inner wall of the protective ring (31). A limiting block (331) is fixedly provided on the inner wall of the movable cylinder (33), while a limiting plate (332) is rotatably provided on the outer surface of the movable cylinder (33). The output end of the drive unit (32) is fixedly provided with a rotating cylinder (34). The outer surface of the rotating cylinder (34) is symmetrically provided with arc-shaped grooves (341). The arc-shaped grooves (341) are X-shaped when unfolded. At the same time, the two through holes at the end of the arc-shaped grooves (341) are interconnected. The inner wall of the arc-shaped grooves (341) is slidably connected to the outer surface of the limiting block (331).

2. The double-layer vibrating cleaning screen for a wheat combine harvester according to claim 1, characterized in that, A protective plate (36) is fixedly provided at the end of the limiting plate (332), and multiple sets of protective grooves (361) are evenly opened on the inner wall of the protective plate (36).

3. The double-layer vibrating cleaning screen for a wheat combine harvester according to claim 2, characterized in that, The inner wall of the protective groove (361) is slidably provided with a protective block (37), the end of the protective block (37) penetrates and extends to the outside of the protective plate (36), and the end of the protective block (37) is rotatably provided with a pressing plate (372), and an extension rod (373) is fixedly provided on one side of the protective block (37).

4. The double-layer vibrating cleaning screen for a wheat combine harvester according to claim 3, characterized in that, The end of the movable cylinder (33) is rotatably provided with a drive plate (35), and the end of the drive plate (35) is provided with a drive groove (351) corresponding to the extension rod (373). At the same time, the inner wall of the drive groove (351) is slidably connected to the outer surface of the extension rod (373).

5. The double-layer vibrating cleaning screen for a wheat combine harvester according to claim 4, characterized in that, A turntable (38) is fixedly provided at the lower end of the drive plate (35). The end of the turntable (38) extends through and to the outside of the protective plate (36). Multiple sets of scrapers (381) are evenly fixedly provided at the end of the turntable (38). A connecting rod (382) is slidably provided between two adjacent scrapers (381).

6. The double-layer vibrating cleaning screen for a wheat combine harvester according to claim 1, characterized in that, The pretreatment component (2) includes a transmission cylinder (21) that is snapped into the base (1). A cylinder (22) is fixedly installed at the upper end of the transmission cylinder (21). A conveying column (23) is rotatably installed on the inner wall of the cylinder (22). Multiple sets of grooves (231) are opened on the outer surface of the conveying column (23).

7. The double-layer vibrating cleaning screen for a wheat combine harvester according to claim 6, characterized in that, A locking plate (24) is fixedly provided on the inner wall of the transmission cylinder (21), and a docking block (241) is fixedly provided at the end of the locking plate (24). A docking rod (25) is rotatably provided at the end of the docking block (241).

8. The double-layer vibrating cleaning screen for a wheat combine harvester according to claim 7, characterized in that, A swing block (251) is fixedly provided at the end of the docking rod (25). A rotating ring (252) is fixedly provided on the outer surface of the swing block (251). A swing ring (26) is rotatably provided on the outer surface of the rotating ring (252). A movable block (261) is symmetrically rotatably provided on the outer surface of the swing ring (26).

9. A double-layer vibrating cleaning screen for a wheat combine harvester according to claim 8, characterized in that, A fixed plate (27) is fixedly installed at the upper end of the swing block (251), and a telescopic rod (271) is fixedly installed at the end of the fixed plate (27). A tapered plate (28) is fixedly installed at the end of the telescopic rod (271). An elastic element (272) is sleeved on the outer surface of the telescopic rod (271). One end of the elastic element (272) is connected to the end of the telescopic rod (271), and the other end is connected to the end of the tapered plate (28).

10. A double-layer vibrating cleaning screen for a wheat combine harvester according to claim 8, characterized in that, The outer surface of the locking plate (24) is symmetrically and slidably provided with an arc plate (29), and the inner wall of the arc plate (29) is provided with a guide groove (291). The inner wall of the guide groove (291) is slidably connected to the outer surface of the movable block (261).

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