A double longitudinal axial flow flexible pendulum threshing device with reverse differential speed of concave plate screen and drum

Abstract

The present invention provides a dual-longitudinal-axial-flow flexible pendulum threshing device with a concave screen and a drum that rotate in opposite directions and at different speeds. This technical solution incorporates a flexible pendulum threshing element. The flexible pendulum's cushioning effect reduces the impact force of the threshing element on the corn at high rotational speeds, thereby lowering the corn breakage rate. The ellipsoidal pendulum threshing surface increases the contact area and contact time with the corn cobs, reducing impact force and the breakage rate. Furthermore, a rotatable concave screen with spiral screen bars is used. The rotation of the concave screen drives the movement of the corn at the bottom, reducing accumulation at the bottom of the concave screen, allowing for timely discharge of corn kernels and minimizing clogging. The concave screen rotates in opposite directions and at different speeds from the threshing drum, enhancing the kneading effect of the threshing drum and concave screen on the corn and improving the threshing efficiency. Furthermore, the present invention utilizes a dual-longitudinal-axial-flow arrangement, which increases feed volume, creates a relatively thin material layer, and achieves better threshing results, avoiding material accumulation and clogging, while reducing the diameter and length of the threshing drum.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, in particular to a double longitudinal axial flow flexible pendulum threshing device with reverse differential speeds of a concave plate screen and a drum. Background Art

[0002] Achieving low-loss and efficient corn threshing is a key goal during corn harvesting. Threshing is the primary cause of corn kernel breakage and shattering, severely impacting harvest quality and quality. This is particularly true in my country's Huanghuaihai region, where corn kernels have a high moisture content during harvest. As harvesting speeds and feed rates continue to increase, corn shattering becomes more severe, resulting in poor harvesting and significant food waste. During corn threshing, the threshing element directly contacts the corn, impacting, crushing, and kneading the cob, freeing the kernels from the cob and releasing the kernels.

[0003] Existing corn threshing equipment primarily consists of a feed port, upper cover, concave screen, threshing drum, and threshing elements. These elements are primarily spike, plate, ribbed, and blade-type. Currently, there are two main threshing methods: axial-flow threshing drums and differential rollers.

[0004] In an axial-flow threshing drum, corn enters through a feed port. The ears are threshed through the combined action of collision, kneading, and squeezing between the threshing elements and the concave screen. The kernels escape through the gaps in the concave screen and are transported to the outlet. Traditional axial-flow threshing drums suffer from high corn breakage and damage rates during the threshing process, particularly in the Huanghuaihai region, where moisture content is high.

[0005] In a differential-speed roller threshing device, corn enters the feed port between two rollers rotating at different speeds and in opposite directions. The threshing elements on the rollers impact and rub the corn, threshing it. The kernels escape through the gap between the rollers and are transported to the outlet. While this device improves the corn threshing rate and reduces the breakage rate to a certain extent, its structural limitations limit the feed rate.

[0006] The corn threshing device, which uses a threshing drum and a gravure screen at differential speeds, feeds corn from a feed port between two threshing drums and a circular concave screen, which move in opposite directions at differential speeds. The threshing elements on the threshing drum and the circular concave screen impact and rub the corn ears, threshing them. The kernels are discharged through the gaps in the concave screen, and the cobs are discharged through the guide wings at the rear. This device, which rotates in opposite directions during threshing, facilitates kernel discharge. However, the grid-like bars of the concave screen are prone to clogging, resulting in a high breakage rate. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is that the existing threshing elements are mainly rigid elements such as spikes. The corn to be threshed has poor pressure bearing capacity at high moisture content and is easily deformed and broken. The rigid threshing elements such as spikes are in direct contact with the corn kernels at high rotation speeds. The contact area is small, the contact time is short, and the impact force is large. The corn kernels have a high breakage rate and are severely damaged. The corn may even be beaten into a paste and clog the screen.

[0008] The second technical problem to be solved by the present invention is that the existing threshing elements such as the ribbed rod type have a low probability of contact between the corn cob and the threshing element, resulting in a low corn threshing rate and high power consumption.

[0009] The third technical problem to be solved by the present invention is that in the existing fixed concave screen, due to the effect of gravity during the threshing process, the cleaned corn kernels and the uncleaned corn ears are accumulated at the bottom of the concave screen, which makes the screen of the concave screen easily blocked, and the cleaned kernels cannot be discharged in time, causing blockage and affecting the threshing effect.

[0010] The fourth technical problem to be solved by the present invention is: the threshing drum and the concave screen differential corn threshing device, the concave screen bars are grid-shaped and the concave screen is rotatable. Although the rotation of the concave screen can promote the discharge of corn kernels to a certain extent, since the concave screen bars are grid-shaped, they are easy to clog and have a high breakage rate.

[0011] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0012] A double longitudinal axial flow flexible pendulum threshing device with reverse differential speed between a concave plate screen and a drum, comprising a concave plate screen and a threshing drum, wherein:

[0013] The threshing drum includes a front spiral guide cone, a middle flexible pendulum, a flexible threshing plate, and a debris removal plate; the flexible pendulum is welded to the threshing drum through a flexible pendulum mounting hole; the flexible threshing plate is welded to the threshing drum through a flexible threshing plate mounting hole;

[0014] The flexible pendulum includes a dust cover, a spring limit cover, a hammer base, a hammer, a lower elastic body, an upper elastic body, a fastening screw, and a screw; the hammer includes an upper ellipsoid and a lower sphere, and the rubber sleeve is installed on the ellipsoid; the spring limit cover is connected to the hammer base by a fastening screw, the sphere at the lower part of the hammer is confined between the upper elastic body and the lower elastic body, and the dust cover is fixed by a screw;

[0015] The concave plate screen includes an upper concave plate screen and a lower concave plate screen. The upper concave plate screen has upper concave plate screen spiral screen bars, and the lower concave plate screen has lower concave plate screen spiral screen bars. The spiral screen bars of the upper concave plate screen and the spiral screen bars of the lower concave plate screen rotate in opposite directions. A concave plate screen transmission gear is installed at the shaft head position in the middle of the concave plate screen, and bearings are installed at the shaft neck positions at both ends. The upper concave plate screen and the lower concave plate screen are connected by bolts. There are convex ridges on both the upper concave plate screen and the lower concave plate screen (located at the busbar position). The convex ridges of the upper concave plate screen and the convex ridges of the lower concave plate screen are aligned with each other (to facilitate the positioning of the concave plate screen transmission gear).

[0016] The threshing drum is located inside the concave screen, and the threshing drum and the concave screen rotate in opposite directions.

[0017] Preferably, the upper elastic body and the lower elastic body are both wave springs.

[0018] Preferably, the threshing drum and the concave screen rotate in opposite directions at differential speeds, the threshing drum has a rotation speed range of 200 to 1000 r / min, and the concave screen has a rotation speed range of 50 to 150 r / min. Further preferably, the threshing drum has a rotation speed range of 400 to 1000 r / min.

[0019] Preferably, the concave plate screen and the threshing drum have a reverse differential speed dual longitudinal axial flow flexible threshing device that is inclined at 6 to 10 degrees (to ensure smooth backward transport of corn).

[0020] Preferably, the machine also includes a frame, wherein the concave plate screen and the threshing drum are both mounted on the frame.

[0021] Preferably, a discharge mask and an inlet mask are also included, and the discharge mask and the inlet mask are respectively located at both ends of the concave screen.

[0022] Preferably, it also includes a motor, a transmission chain, a gear set, and a rotating shaft, wherein the rotating shaft is installed on the frame, the motor drives part of the gear set to rotate through the transmission chain, and this part of the gear set simultaneously drives the threshing drum and the rotating shaft to rotate, and another gear set is fixed on the rotating shaft, and the other gear set is engaged with the concave plate screen transmission gear for transmission.

[0023] When the present invention is in operation, corn passes through the feeding mask and enters the spiral guide cone at the front of the threshing drum. Driven by the rotation of the spiral guide cone, the corn enters the flexible pendulum threshing area and the flexible threshing plate threshing area in sequence.

[0024] The flexible pendulum rotates driven by the threshing drum. The hammer inside the flexible pendulum tends to extend outward under the action of centrifugal force, and the upper elastic body is compressed. When the corn contacts the ellipsoid at the top of the flexible pendulum, an inward force is applied to the hammer, and the hammer moves inward and deflects a certain angle. The hammer compresses the lower elastic body to relieve the impact force of the ellipsoid on the corn. A rubber sleeve is installed on the ellipsoid at the top of the flexible pendulum. The ellipsoid can increase the contact area and contact time with the corn cob and reduce the collision force. The rubber sleeve can reduce the impact force of the ellipsoid on the corn, increase the friction on the corn, improve the kneading effect, and achieve preliminary threshing of the corn cob.

[0025] The flexible threshing plate rotates driven by the threshing drum. The flexible threshing plate has a large contact area with the corn and a long contact time. The torsion spring can alleviate the impact force of the plate on the corn, thereby achieving further flexible threshing of the unthreshed corn.

[0026] Finally, the corn cobs and ears are discharged through the waste removal area.

[0027] The flexible threshing plate includes a threshing plate, a torsion spring, and a base. The torsion spring mitigates the impact of the plate on the corn. The concave screen rotates in opposite directions to the threshing drum. The threshing drum rotates at a speed of 400-1000 r / min (or 200-1000 r / min), while the concave screen rotates at a speed of 50-150 r / min. The concave screen rotates in opposite directions and at different speeds to the threshing drum, which can increase the kneading effect of the threshing drum and the concave screen on the corn and improve the corn threshing efficiency. The spiral screen bars of the upper and lower concave screens rotate in opposite directions. When the concave screens rotate, the spiral screen bars of the upper and lower concave screens exert varying forces on the corn, thereby increasing the corn's movement posture, the probability of contact with the threshing elements, and the threshing effect.

[0028] The concave screen rotates, driving the corn at the bottom to move, thereby reducing bottom accumulation and discharging kernels in time to reduce material blockage.

[0029] The use of dual longitudinal axial flow helps increase corn feed volume and improve work efficiency. The dual longitudinal axial flow threshing device can increase corn cob feed volume. At the same feed volume, the feed corn material flow is evenly distributed and the material layer is relatively thin. This can ensure that the corn cobs are fully threshed and the corn material flow is orderly backward, avoiding material accumulation and blockage. At the same time, working together with the new dual longitudinal axial flow threshing drum, it can also reduce the diameter and length of the threshing drum, making the overall structure of the corn grain harvester more compact.

[0030] The double longitudinal axial flow flexible threshing device with reverse differential speed between the concave screen and the threshing drum is inclined at 6 to 10 degrees to ensure smooth backward transportation of corn.

[0031] The present invention provides a dual-longitudinal axial flow flexible pendulum threshing device with a concave screen and a drum operating at opposite speeds. This technical solution addresses the problems of existing threshing devices, such as high corn breakage, extensive damage, and low corn threshing efficiency. By designing a flexible pendulum threshing element, the buffering effect of the flexible pendulum reduces the impact force on the corn at high rotational speeds, thereby lowering the corn breakage rate. The ellipsoidal pendulum threshing surface increases the contact area and duration with the corn cob, reducing impact force and improving the corn threshing efficiency.

[0032] At the same time, in response to the problems of serious corn accumulation at the bottom, high clogging rate, and poor threshing effect in the existing threshing device, a rotatable concave screen with spiral screen bars is designed. The rotation of the concave screen drives the movement of the corn at the bottom, reduces the accumulation at the bottom of the concave screen, discharges corn kernels in time, and reduces clogging; when the concave screen rotates, the spiral screen bars produce constantly changing forces on the corn, increasing the movement posture of the corn and the probability of contact between the corn material and the threshing element. The concave screen rotates in opposite directions to the threshing drum and at different speeds, which improves the kneading effect of the grain and the threshing rate.

[0033] Furthermore, to address the low threshing efficiency of existing threshing devices, a dual-longitudinal-axial-flow threshing device was designed. This increases the corn cob feed rate. The dual-longitudinal-axial-flow arrangement provides a more even distribution of the corn feed flow and a relatively thinner material layer, resulting in better threshing results. It also ensures an orderly backward flow of the corn material, effectively preventing material accumulation and blockage. The dual-longitudinal-axial-flow flexible pendulum threshing drum reduces its diameter and length, making the overall structure of the corn kernel harvester more compact.

[0034] The beneficial effects of the present invention are concentrated in the following aspects:

[0035] 1. In the flexible pendulum, when the corn comes into contact with the high-speed rotating flexible pendulum, the hammer moves inward and deflects a certain angle, compressing the lower elastic body to cushion the impact force and reduce the corn breakage rate; the ellipsoid on the top of the flexible pendulum is installed with a rubber sleeve, which can increase the contact area and contact time with the corn ear. The rubber sleeve can reduce the impact force of the ellipsoid on the corn, increase the friction on the corn, improve the kneading effect, and improve the removal rate.

[0036] 2. The flexible threshing plate rotates driven by the threshing drum. The flexible threshing plate has a large contact area with the corn and a long contact time. The torsion spring can relieve the impact of the plate on the corn and reduce the corn breakage rate.

[0037] 3. The concave screen rotates in opposite directions to the threshing drum. The speed of the threshing drum is 400-1000r / min (or 200-1000r / min), and the speed of the concave screen is 50-150r / min. The concave screen and the threshing drum rotate in opposite directions and at different speeds, which can increase the friction with the corn and improve the kneading effect on the corn; the spiral screen bars of the upper concave screen and the lower concave screen rotate in opposite directions. When the concave screen rotates, the spiral screen bars of the upper concave screen and the lower concave screen generate changing forces on the corn, thereby increasing the movement posture of the corn, increasing the probability of contact with the threshing element, and improving the threshing effect.

[0038] The concave screen rotates, driving the corn at the bottom to move, thereby reducing bottom accumulation and discharging kernels in time to reduce material blockage.

[0039] 4. The dual-axial flow threshing system helps increase corn feed volume and improve the efficiency of the corn harvester. The dual-axial flow threshing device not only increases corn cob feed volume, but also provides a uniform corn material flow distribution and a relatively thin material layer at the same feed volume, ensuring full threshing of the corn cobs and orderly backward flow of the corn material, thus preventing material accumulation and blockage. The dual-axial flow threshing drum reduces the diameter and length of the traditional single-axial flow threshing drum, making the overall structure of the corn harvester more compact.

[0040] 5. The double longitudinal axial flow flexible threshing device with reverse differential speed between the concave screen and the threshing drum is inclined at 6 to 10 degrees to ensure smooth backward transportation of corn. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is an axonometric view of the present invention as a whole;

[0042] Figure 2 It is an overall diagram of the threshing drum in the present invention;

[0043] Figure 3 is a cross-sectional view of the flexible pendulum in the present invention;

[0044] Figure 4 It is an axonometric view of the concave plate screen in the present invention;

[0045] Figure 5 Schematic diagram of the rotation direction of the concave plate screen bars in the present invention;

[0046] Figure 6 Schematic diagram of the rotation direction of the threshing drum-concave screen in the present invention;

[0047] In the picture:

[0048] 1. Motor; 2. Drive chain; 3. Gear set; 4. Rotating shaft; 5. Concave plate screen drive gear; 6. Frame; 7. Discharge mask; 8. Concave plate screen; 9. Threshing drum; 10. Inlet mask; 11. Upper concave plate screen; 12. Lower concave plate screen; 13. Middle shaft head; 14. Both end journals; 15. Upper concave plate screen spiral bars; 16. Lower concave plate screen spiral bars; 17. Bearing; 18. Ridge; 19. Screw Bolt; 20. Spiral guide cone; 21. Flexible pendulum; 22. Flexible threshing plate; 23. Debris removal plate; 24. Flexible pendulum mounting hole; 25. Flexible threshing plate mounting hole; 26. Dust cover; 27. Spring limit cover; 28. Hammer base; 29. ​​Hammer; 30. Sphere; 31. Ellipsoid; 32. Rubber sleeve; 33. Lower elastic body; 34. Upper elastic body; 35. Fastening screw; 36. Screw. DETAILED DESCRIPTION

[0049] The following is a detailed description of specific embodiments of the present invention. To avoid excessive unnecessary detail, well-known structures or functions will not be described in detail in the following examples. Approximate language used in the following examples can be used for quantitative expression to indicate that a certain amount of variation is allowed without changing the basic function. Unless otherwise defined, technical and scientific terms used in the following examples have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0050] Example 1

[0051] A double longitudinal axial flow flexible pendulum threshing device with reverse differential speed of concave plate screen and drum, such as Figures 2 to 6 As shown, it includes a concave screen 8 and a threshing drum 9, wherein:

[0052] The threshing drum 9 includes a front spiral guide cone 20, a middle flexible pendulum 21, a flexible threshing plate 22, and a debris removal plate 23; the flexible pendulum 21 is welded to the threshing drum 9 through a flexible pendulum mounting hole 24; the flexible threshing plate 22 is welded to the threshing drum 9 through a flexible threshing plate mounting hole 25;

[0053] The flexible pendulum 21 includes a dust cover 26, a spring stop cover 27, a hammer base 28, a hammer 29, a lower elastic body 33, an upper elastic body 34, a fastening screw 35, and a screw 36. The hammer 29 includes an upper ellipsoid 31 and a lower sphere 30. A rubber sleeve 32 is mounted on the ellipsoid 31. The spring stop cover 27 and the hammer base 28 are connected by a fastening screw 35. The sphere 30 below the hammer 29 is confined between the upper elastic body 34 and the lower elastic body 33. The dust cover 26 is fixed by a screw 36.

[0054] The concave plate screen 8 includes an upper concave plate screen 11 and a lower concave plate screen 12. The upper concave plate screen 11 has an upper concave plate screen spiral screen bar 15, and the lower concave plate screen 12 has a lower concave plate screen spiral screen bar 16. The upper concave plate screen spiral screen bar 15 and the lower concave plate screen spiral screen bar 16 rotate in opposite directions. The concave plate screen transmission gear 5 is installed at the shaft head 13 in the middle of the concave plate screen 8, and the bearings 17 are installed at the journals 14 at both ends. The upper concave plate screen 11 and the lower concave plate screen 12 are connected by bolts 19. There are ridges 18 on both the upper concave plate screen 11 and the lower concave plate screen 12. The ridges 18 of the upper concave plate screen 11 and the ridges 18 of the lower concave plate screen 12 are aligned with each other.

[0055] The threshing drum 9 is located inside the concave screen 8, and the threshing drum 9 and the concave screen 8 rotate in opposite directions.

[0056] Example 2

[0057] A double longitudinal axial flow flexible pendulum threshing device with reverse differential speed of concave plate screen and drum, such as Figures 1 to 6 As shown, it includes a concave screen 8 and a threshing drum 9, wherein:

[0058] The threshing drum 9 includes a front spiral guide cone 20, a middle flexible pendulum 21, a flexible threshing plate 22, and a debris removal plate 23; the flexible pendulum 21 is welded to the threshing drum 9 through a flexible pendulum mounting hole 24; the flexible threshing plate 22 is welded to the threshing drum 9 through a flexible threshing plate mounting hole 25;

[0059] The flexible pendulum 21 includes a dust cover 26, a spring stop cover 27, a hammer base 28, a hammer 29, a lower elastic body 33, an upper elastic body 34, a fastening screw 35, and a screw 36. The hammer 29 includes an upper ellipsoid 31 and a lower sphere 30. A rubber sleeve 32 is mounted on the ellipsoid 31. The spring stop cover 27 and the hammer base 28 are connected by a fastening screw 35. The sphere 30 below the hammer 29 is confined between the upper elastic body 34 and the lower elastic body 33. The dust cover 26 is fixed by a screw 36.

[0060] The concave plate screen 8 includes an upper concave plate screen 11 and a lower concave plate screen 12. The upper concave plate screen 11 has an upper concave plate screen spiral screen bar 15, and the lower concave plate screen 12 has a lower concave plate screen spiral screen bar 16. The upper concave plate screen spiral screen bar 15 and the lower concave plate screen spiral screen bar 16 rotate in opposite directions. The concave plate screen transmission gear 5 is installed at the shaft head 13 in the middle of the concave plate screen 8, and the bearings 17 are installed at the journals 14 at both ends. The upper concave plate screen 11 and the lower concave plate screen 12 are connected by bolts 19. There are ridges 18 on both the upper concave plate screen 11 and the lower concave plate screen 12. The ridges 18 of the upper concave plate screen 11 and the ridges 18 of the lower concave plate screen 12 are aligned with each other.

[0061] The threshing drum 9 is located inside the concave screen 8, and the threshing drum 9 and the concave screen 8 rotate in opposite directions.

[0062] The upper elastic body 34 and the lower elastic body 33 are both wave springs.

[0063] The threshing drum 9 and the concave screen 8 rotate in opposite directions at differential speeds. The rotation speed range of the threshing drum 9 is 200 to 1000 r / min, and the rotation speed range of the concave screen 8 is 50 to 150 r / min.

[0064] The concave plate screen and the threshing drum have reverse differential speeds and the double longitudinal axial flow flexible threshing device is inclined at 6-10 degrees.

[0065] It also includes a frame 6, wherein the concave plate screen 8 and the threshing drum 9 are both installed on the frame 6.

[0066] It also includes a discharge mask 7 and an inlet mask 10 , which are respectively located at both ends of the concave screen 8 .

[0067] It also includes a motor 1, a transmission chain 2, a gear set 3, and a rotating shaft 4, wherein the rotating shaft 4 is installed on the frame 6, the motor 1 drives part of the gear set 3 to rotate through the transmission chain 2, and this part of the gear set 3 simultaneously drives the threshing drum 9 and the rotating shaft 4 to rotate, and the other gear set 3 is fixed on the rotating shaft 4, and the other gear set 3 is engaged with the concave screen transmission gear 5 for transmission.

[0068] The embodiments of the present invention are described in detail above, but the contents are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the scope of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A double longitudinal axial flow flexible pendulum threshing device with reverse differential speed between a concave plate screen and a drum, comprising a concave plate screen (8) and a threshing drum (9), characterized in that: The threshing drum (9) comprises a front spiral guide cone (20), a middle flexible pendulum (21), a flexible threshing plate (22), and a debris removal plate (23); the flexible pendulum (21) is welded to the threshing drum (9) through a flexible pendulum mounting hole (24); and the flexible threshing plate (22) is welded to the threshing drum (9) through a flexible threshing plate mounting hole (25). The flexible pendulum (21) comprises a dust cover (26), a spring limiting cover (27), a hammer base (28), a hammer (29), a lower elastic body (33), an upper elastic body (34), a fastening screw (35), and a screw (36); the hammer (29) comprises an upper ellipsoid (31), a lower sphere (30), and a rubber sleeve (32) is mounted on the ellipsoid (31); the spring limiting cover (27) and the hammer base (28) are connected by a fastening screw (35), the sphere (30) at the lower part of the hammer (29) is restricted between the upper elastic body (34) and the lower elastic body (33), and the dust cover (26) is fixed by a screw (36); The concave plate screen (8) comprises an upper concave plate screen (11) and a lower concave plate screen (12). The upper concave plate screen (11) has an upper concave plate screen spiral screen bar (15), and the lower concave plate screen (12) has a lower concave plate screen spiral screen bar (16). The upper concave plate screen spiral screen bar (15) and the lower concave plate screen spiral screen bar (16) rotate in opposite directions. A concave plate screen transmission gear (5) is installed at the shaft head (13) in the middle of the concave plate screen (8), and bearings (17) are installed at the shaft necks (14) at both ends. The upper concave plate screen (11) and the lower concave plate screen (12) are connected by bolts (19). Both the upper concave plate screen (11) and the lower concave plate screen (12) have ridges (18). The ridges (18) of the upper concave plate screen (11) and the ridges (18) of the lower concave plate screen (12) are aligned with each other. The threshing drum (9) is located inside the concave plate screen (8), and the threshing drum (9) and the concave plate screen (8) rotate in opposite directions.

2. A double longitudinal axial flow flexible pendulum threshing device with reverse differential speed of concave plate screen and drum according to claim 1, characterized in that: The upper elastic body (34) and the lower elastic body (33) are both wave springs.

3. The double longitudinal axial flow flexible pendulum threshing device with reverse differential speed of the concave plate screen and the drum according to claim 1 is characterized in that: The threshing drum (9) and the concave plate screen (8) rotate in opposite directions at differential speeds. The rotation speed range of the threshing drum (9) is 200 to 1000 r / min, and the rotation speed range of the concave plate screen (8) is 50 to 150 r / min.

4. The double longitudinal axial flow flexible pendulum threshing device with reverse differential speed of the concave plate screen and the drum according to claim 1 is characterized in that: The concave plate screen and the drum have reverse speed differentials and the double longitudinal axial flow flexible pendulum threshing device is inclined at 6-10 degrees.

5. The double longitudinal axial flow flexible pendulum threshing device with reverse differential speed of the concave plate screen and the drum according to claim 1 is characterized in that: It also comprises a frame (6), wherein the concave plate screen (8) and the threshing drum (9) are both mounted on the frame (6).

6. A double longitudinal axial flow flexible pendulum threshing device with reverse differential speed of concave plate screen and drum according to claim 5, characterized in that: It also includes a discharge mask (7) and an inlet mask (10), and the discharge mask (7) and the inlet mask (10) are respectively located at two ends of the concave plate screen (8).

7. A double longitudinal axial flow flexible pendulum threshing device with reverse differential speed of concave plate screen and drum according to claim 6, characterized in that: The machine also includes a motor (1), a transmission chain (2), a gear set (3), and a rotating shaft (4), wherein the rotating shaft (4) is mounted on a frame (6); the motor (1) drives a portion of the gear set (3) to rotate via the transmission chain (2); the portion of the gear set (3) simultaneously drives the threshing drum (9) and the rotating shaft (4) to rotate; another gear set (3) is fixed on the rotating shaft (4); and the another gear set (3) is meshed with a concave screen transmission gear (5) for transmission.

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