Double-differential-speed axial flow roller threshing and separating mechanism and grain harvesting machine

Abstract

The utility model relates to a double-differential-speed axial flow roller threshing and separating mechanism and a grain harvesting machine, and the double-differential-speed axial flow roller threshing and separating mechanism comprises a threshing roller, a threshing concave plate, a separating roller, a separating concave plate assembly and a separating roller shaft, the threshing concave plates sleeve the outer side of the threshing roller at intervals, outer gear rings are arranged on the outer surfaces of the threshing concave plates, and the separation concave plate assemblies sleeve the outer side of the separation roller at intervals; the separation drum shaft is coaxially sleeved in the separation drum and the threshing drum, one end of the separation drum shaft is fixedly connected with the separation drum, and the position close to the other end of the separation drum shaft is rotatably connected with the threshing drum; the separating roller is in differential transmission connection with the threshing roller through the inner gear assembly. Sundry accumulation on the threshing chopping board can be reduced, the threshing efficiency and the threshing effect are improved, meanwhile, the rotating speed of the threshing cylinder is reduced through relative movement, the load of the cylinder is reduced, and the service life of the machine is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field related to agricultural machinery, and in particular to a double-differential axial flow drum threshing and separation mechanism and a grain harvester. Background Art

[0002] With the development of agricultural mechanization in China, agricultural machinery development technology has become increasingly mature, and users have increasingly higher requirements for machine performance, operating efficiency, and reliability. Most mature kernels fall off in the front half of the drum, while a few difficult-to-remove kernels fall off in the back half. Existing corn kernel harvesters use an integral drum with the same rotational speed for threshing and separation. Increasing the speed of the axial flow drum will cause problems such as kernel breakage and excessive inclusions. At the same time, the threshing concave screen and separation concave screen of existing corn kernel harvesters are fixed, and the separation concave screen is combined with the upper cover of the separation drum to form a circle concentric with the separation drum. This can easily cause clogging of the concave screen surface when there is a lot of crop debris and a high moisture content. If not cleaned in time, this will affect the threshing effect and efficiency. Insufficient separation space will cause kernel loss and other problems. In addition, the heavy load on the drum reduces the drum's service life. Therefore, most methods solve this problem by reducing the rotational speed to extend the threshing and separation time. Utility Model Content

[0003] In order to solve one or more technical problems existing in the prior art, the utility model provides a double-differential axial flow drum threshing and separation mechanism and a grain harvester.

[0004] The technical solution of the utility model for solving the above technical problems is as follows: a double-differential axial flow drum threshing and separation mechanism, comprising a threshing drum, a threshing concave, a separation drum, a separation concave assembly and a separation drum shaft, the threshing drum and the separation drum are coaxially arranged front to back, the threshing concave plates are sleeved on the outside of the threshing drum at intervals and the outer surface of the threshing concave plates is provided with an outer gear ring, and the separation concave assembly is sleeved on the outside of the separation drum at intervals; the separation drum shaft is coaxially sleeved in the separation drum and the threshing drum, one end of the separation drum shaft is fixedly connected to the separation drum, and the position of the separation drum shaft near the other end is rotationally connected to the threshing drum; the separation drum is differentially connected to the threshing drum through an internal gear assembly.

[0005] The beneficial effects of the present invention are as follows: the dual-differential axial flow drum threshing and separation mechanism of the present invention, by providing an external gear ring on the outer surface of the threshing concave, can drive the threshing concave and the threshing drum to move in opposite directions at differential speeds, while the separation drum is differentially connected to the threshing drum via an internal gear assembly, thereby achieving dual-differential threshing and separation of grains; the threshing concave and the threshing drum rotate in opposite directions at differential speeds, thereby reducing the accumulation of debris on the threshing chopping board, improving threshing efficiency and threshing effect, while the relative motion reduces the threshing drum speed, reduces the drum load, and increases the service life of the machine. The threshing and separation drums rotate in the same direction at differential speeds, reducing the grain breakage rate and impurity content, improving the threshing effect, and reducing the drum volume compared to an integral threshing and separation drum with the same threshing effect.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, the internal gear assembly includes a gear support frame, an internal gear and an inner gear ring, the inner gear ring is coaxially fixed on the inner side wall of the separation drum, the gear support frame is fixed on the threshing drum, and the internal gear is fixed on the gear support frame and meshes with the inner gear ring.

[0008] The beneficial effect of adopting the above further solution is that by arranging the gear support frame, the internal gear and the inner gear ring, differential and same-direction rotation between the separation drum and the threshing drum can be achieved.

[0009] Furthermore, the gear support frame includes a plurality of support plates extending radially, and the internal gears are fixed on the support plates.

[0010] The beneficial effect of adopting the above further solution is that the internal gear can be easily installed by providing a support plate.

[0011] Furthermore, an internal gear is provided at the free end of each support plate; and the width of the support plate gradually decreases from the inside to the outside.

[0012] Furthermore, a hollow threshing drum shaft is fixed in the threshing drum, the separation drum shaft is coaxially inserted into the hollow structure of the threshing drum shaft, the threshing drum shaft and the separation drum shaft are rotatably connected via a first bearing; the separation drum is differentially connected to the threshing drum shaft via an internal gear assembly.

[0013] The beneficial effect of adopting the above further solution is that by providing the threshing drum shaft, independent support between the threshing drum and the separation drum is facilitated, and the overall transmission structure is more stable and reliable.

[0014] Furthermore, a hollow threshing drum shaft is fixedly provided in the threshing drum, the separation drum shaft is coaxially inserted into the hollow structure of the threshing drum shaft, and the threshing drum shaft and the separation drum shaft are rotatably connected via a first bearing; the gear support frame is sleeved on the separation drum shaft and fixedly connected to the threshing drum shaft, and the separation drum drives the internal gear to rotate through the inner gear ring, thereby driving the threshing drum shaft and the threshing drum to rotate differentially.

[0015] The beneficial effect of adopting the above further solution is that stable differential transmission of the threshing drum can be achieved.

[0016] Furthermore, the separation concave plate assembly includes a separation concave plate and an upper cover plate, the cross-section of the separation concave plate is a first arc structure, the upper cover plate is an arc structure, the two ends of the upper cover plate in the circumferential direction are respectively detachably connected to the two ends of the separation concave plate in the circumferential direction to form a cylindrical structure, and the cross-sectional area of ​​the cylindrical structure is larger than the area of ​​the circle where the separation concave plate is located.

[0017] The beneficial effect of adopting the above further solution is that by enlarging the upper cover of the separation drum, the separation space can be increased, the crop separation is more thorough, the separation effect is better, and the grain loss is reduced.

[0018] Furthermore, the outer surface of the threshing concave is provided with at least one circle of coaxially arranged guide ribs, and the guide ribs are provided with auxiliary support rollers.

[0019] The beneficial effect of adopting the above further solution is that the threshing concave can be stably supported and rotated by utilizing the cooperation of the guide ribs and the auxiliary support rollers.

[0020] Furthermore, it also includes a first power unit and a second power unit, the output shaft of the first power unit is fixedly connected to one end of the separation drum shaft and drives the separation drum shaft to rotate in a first direction, the output shaft of the second power unit is engaged with the outer gear ring through the driving gear and drives the outer gear ring to rotate in a second direction, and the first direction and the second direction are opposite.

[0021] A grain harvester comprises a harvester body and the above-mentioned double-differential axial flow drum threshing and separation mechanism installed on the harvester body.

[0022] The beneficial effects of the utility model are as follows: the grain harvester of the utility model has a better threshing and separation effect of grains, and prolongs the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the main structure of the double-differential axial flow drum threshing and separation mechanism of the utility model;

[0024] Figure 2 for Figure 1Schematic diagram of a local enlarged structure;

[0025] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0026] Figure 4 for Figure 3 Schematic diagram of a local enlarged structure;

[0027] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure of the middle BB;

[0028] Figure 6 This is a side view of the double differential axial flow drum threshing and separation mechanism of the utility model. Figure 1 ;

[0029] Figure 7 This is a side view of the double differential axial flow drum threshing and separation mechanism of the utility model. Figure 2 .

[0030] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0031] 1. Threshing drum; 2. Threshing concave; 3. Separating drum; 4. Separating concave; 5. Upper cover; 6. Separating drum shaft; 7. Threshing drum shaft; 8. Gear support frame; 9. Internal gear; 10. Inner gear ring; 11. Outer gear ring; 12. Support plate; 13. First bearing; 14. Second bearing; 15. Guide rib; 16. Auxiliary support roller; 17. First power unit; 18. Second power unit; 19. Driving gear; 20. Spline connector; 21. Bolt. DETAILED DESCRIPTION

[0032] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0033] like Figures 1 to 7 As shown, a dual-differential axial flow drum threshing and separation mechanism of this embodiment includes a threshing drum 1, a threshing concave 2, a separation drum 3, a separation concave assembly and a separation drum shaft 6, the threshing drum 1 and the separation drum 3 are coaxially arranged front to back, the threshing concave 2 is sleeved on the outside of the threshing drum 1 at intervals, and the outer surface of the threshing concave 2 is provided with an outer gear ring 11, and the separation concave assembly is sleeved on the outside of the separation drum 3 at intervals; the separation drum shaft 6 is coaxially sleeved in the separation drum 3 and the threshing drum 1, one end of the separation drum shaft 6 is fixedly connected to the separation drum 3, and the position of the separation drum shaft 6 near the other end is rotationally connected to the threshing drum 1; the separation drum 3 is differentially connected to the threshing drum 1 through an internal gear assembly.

[0034] like Figures 3 to 5 As shown, the internal gear assembly of this embodiment includes a gear support frame 8, an internal gear 9 and an inner gear ring 10. The inner gear ring 10 is coaxially fixed to the inner side wall of the separation drum 3. The gear support frame 8 is fixed to the threshing drum 1. The inner gear 9 is fixed to the gear support frame 8 and meshes with the inner gear ring 10. By providing the gear support frame, the internal gear and the inner gear ring, differential and co-directional rotation between the separation drum and the threshing drum can be achieved.

[0035] like Figures 3 to 5 As shown, the gear support frame 8 of this embodiment includes a plurality of support plates 12 extending radially, and the internal gear 9 is fixed on the support plates 12. The internal gear is easily installed by providing the support plates.

[0036] like Figure 5 As shown, in this embodiment, an internal gear 9 is provided at the free end of each support plate 12; the width of the support plate 12 gradually decreases from the inside to the outside.

[0037] like Figure 4 As shown, an optional solution of this embodiment is that a hollow threshing drum shaft 7 is fixedly provided in the threshing drum 1, and the separation drum shaft 6 is coaxially provided in the hollow structure of the threshing drum shaft 7. The threshing drum shaft 7 and the separation drum shaft 6 are rotationally connected via a first bearing 13; the separation drum 3 is differentially connected to the threshing drum shaft 7 via an internal gear assembly. By providing the threshing drum shaft, independent support between the threshing drum and the separation drum is facilitated, and the overall transmission structure is more stable and reliable.

[0038] like Figure 3 and Figure 4 As shown, a specific solution of this embodiment is that a hollow threshing drum shaft 7 is fixedly provided in the threshing drum 1, and the separation drum shaft 6 is coaxially inserted into the hollow structure of the threshing drum shaft 7. The threshing drum shaft 7 and the separation drum shaft 6 are rotatably connected via a first bearing 13; the gear support frame 8 is sleeved on the separation drum shaft 6 and fixedly connected to the threshing drum shaft 7, and the separation drum 3 drives the internal gear 9 to rotate via the inner gear ring 10, thereby driving the threshing drum shaft 7 and the threshing drum 1 to perform differential rotation. Stable differential transmission of the threshing drum can be achieved.

[0039] Specifically, such as Figure 3 As shown, both ends of the threshing drum shaft 7 of this embodiment are rotatably connected to the separation drum shaft 6 through a first bearing 13. The gear support frame 8 can be fixed to one end of the threshing drum shaft 7 close to the separation drum 3, so that the internal gear 9 on the gear support frame 8 is located in the separation drum 3 and meshes with the inner gear ring 10.

[0040] like Figures 1 to 3 、 Figure 5~Figure 6 As shown, the separation concave assembly of this embodiment includes a separation concave 4 and an upper cover 5. The cross-section of the separation concave 4 presents a first circular arc structure, and the upper cover 5 presents an arc-shaped structure. The circumferential ends of the upper cover 5 are detachably connected to the circumferential ends of the separation concave 4 to form a cylindrical structure. The cross-sectional area of ​​the cylindrical structure is larger than the area of ​​the circle in which the separation concave 4 is located. By enlarging the upper cover of the separation drum, the separation space can be increased, resulting in more thorough crop separation, better separation effect, and reduced grain loss.

[0041] Preferably, the upper cover plate 5 of this embodiment is in a second arc structure or an elliptical arc structure. By setting the upper cover plate in a circular arc structure or an elliptical arc structure, problems such as material jamming can be avoided.

[0042] Specifically, the angle of the second circular arc structure is greater than 180°, and the angle of the first circular arc structure is less than 180°; or, the angle of the second circular arc structure is less than 180°, and the angle of the first circular arc structure is greater than 180°; or, the angle of the second circular arc structure is equal to 180°, and the angle of the first circular arc structure is equal to 180°.

[0043] Optionally, the angle of the second arc structure or the first arc structure is 200° to 300°, and the angle of the first arc structure or the second arc structure is 100° to 160°. By limiting the two arc angles, the structure can be made more stable, the separation can be smoother, the separation efficiency can be higher, and the separation effect can be better.

[0044] Specifically, the angle of the second arc structure or the first arc structure is 225°, 210°, 220°, 230°, 240°, 250°, 260°, 270°, 280°, 290°, and 235°, and the angle of the first arc structure or the second arc structure is 135°, 105°, 110°, 115°, 120°, 130°, 135°, 140°, 145°, 145°, and 150°.

[0045] Optionally, the radius of the first arc structure is 300-500 mm, and the radius of the second arc structure is 350-550 mm.

[0046] Specifically, the radius of the first arc structure is 372.5mm, 310mm, 315mm, 320mm, 325mm, 330mm, 335mm, 340mm, 345mm, 350mm, 360mm, 365mm, 370mm, 375mm, 380mm, 385mm, 390mm, 395mm, 400mm, 405mm, 410mm, 415mm, 420mm, 425mm, 430mm, 435mm, 440mm, 445mm, 450mm, 455mm, 460mm, 465mm, 470mm, 475mm, 480mm, 495mm, and 500mm; the radius of the second arc structure is 406mm, 355mm, 360mm, 365mm, 370mm, 375mm, 380mm, 385mm, 390mm, 395mm, 400mm, 405mm, 410mm, 415mm, 420mm, 425mm, 430mm, 435mm, 440mm, 445mm, 450mm, 455mm, 460mm, 465mm, 470mm, 475mm, 480mm, 485mm, 480mm, 485mm, 490mm, 500mm, 505mm, 510mm, 515mm, 520mm, 525mm, 530mm, 535mm, 540mm, 545mm, 550mm.

[0047] like Figure 5~Figure 6 As shown, a preferred solution of this embodiment is that the distance between the circumferential ends of the upper cover plate 5 is equal to the distance between the circumferential ends of the separation concave plate 4. By selecting the angle, radius, etc. of the upper cover plate 5 and the angle, radius, etc. of the separation concave plate 4, the distance between the circumferential ends of the upper cover plate 5 and the distance between the circumferential ends of the separation concave plate 4 can be made equal, thereby facilitating the connection and fixation between the upper cover plate and the separation concave plate.

[0048] When the distance between the circumferential ends of the upper cover plate 5 is not equal to the distance between the circumferential ends of the separation concave plate 4, an auxiliary connecting piece can be used for connection. The auxiliary connecting piece can be a horizontally arranged connecting plate to connect and fix the radially displaced ends of the upper cover plate and the separation concave plate.

[0049] like Figure 5~Figure 6 As shown, the central axis of the upper cover plate 5 of this embodiment is arranged parallel to the central axis of the separation concave plate 4, so as to form a cylindrical structure with consistent front and rear dimensions.

[0050] like Figure 5~Figure 6As shown, in this embodiment, the separation concave plate 4 has two circumferential ends extending outward to form first connecting edges, and the upper cover plate 5 has two circumferential ends extending outward to form second connecting edges. The two first connecting edges and the two second connecting edges are butted against each other and fixed together using connecting bolts. The provision of the first and second connecting edges facilitates the connection and fixation between the upper cover plate and the separation concave plate.

[0051] The separation concave plate assembly of this embodiment is a non-circular separation mechanism. By enlarging the upper cover plate of the separation drum, the separation space can be increased, the crop separation is more thorough, the separation effect is better, and the grain loss is reduced.

[0052] like Figures 1 to 7 As shown, the outer surface of the threshing concave plate 2 of this embodiment is further provided with at least one circle of coaxially arranged guide ribs 15, and the guide ribs 15 are provided with auxiliary support rollers 16. By utilizing the cooperation of the guide ribs and the auxiliary support rollers, the threshing concave plate can be stably supported and rotated.

[0053] like Figures 1 to 3 As shown, a dual-differential axial-flow drum threshing and separation mechanism of this embodiment further includes a first power unit 17 and a second power unit 18. The output shaft of the first power unit 17 is fixedly connected to one end of the separation drum shaft 6 and drives the separation drum shaft 6 to rotate in a first direction. The output shaft of the second power unit 18 engages with the outer ring gear 11 through a drive gear 19 and drives the outer ring gear 11 to rotate in a second direction. The first and second directions are opposite. The first and second power units 17 and 18 can each use a reduction motor drive assembly to provide transmission power.

[0054] Specifically, such as Figure 3 As shown, the output shaft of the first power unit 17 of this embodiment is spline-connected with a spline connection seat 20, and the spline connection seat 20 is fixed to one end of the separation drum shaft 6 by a bolt 21, thereby driving the separation drum shaft 6 and the separation drum 3 to rotate.

[0055] like Figure 3 As shown, the other end of the separation drum shaft 6 of this embodiment also passes through the threshing drum shaft 7 and the threshing drum 1 and is connected to the second bearing 14, and can be connected to the frame using the second bearing 14.

[0056] The auxiliary support rollers 16 of this embodiment are also mounted on the frame and can rotate relative to the frame. The auxiliary support rollers 16 are in rolling contact with the guide ribs 15. Four auxiliary support rollers 16 can be provided at one end of the threshing concave plate 2, and two auxiliary support rollers 16 can be provided at the other end. The upper cover plate and the separation concave plate are both fixed to the frame.

[0057] The dual-differential axial flow drum threshing and separation mechanism of this embodiment utilizes an external gear ring disposed on the outer surface of the threshing concave to drive the threshing concave and the threshing drum to move in opposite directions at differential speeds. The separation drum is differentially connected to the threshing drum via an internal gear assembly, enabling dual-differential threshing and separation of grains. The counter-differential rotation of the threshing concave and the threshing drum reduces debris accumulation on the threshing chopping board, improving threshing efficiency and effectiveness. Simultaneously, the relative motion reduces the threshing drum speed, reduces drum load, and increases the machine's service life. The threshing and separation drums rotate differentially in the same direction, reducing grain breakage and impurity content, improving threshing effectiveness, and reducing drum volume compared to a monolithic threshing and separation drum with the same threshing effectiveness.

[0058] This embodiment also provides a grain harvester, comprising a harvester body and the above-mentioned double-differential axial flow drum threshing and separation mechanism installed on the harvester body.

[0059] The grain harvester of this embodiment has a better grain threshing and separation effect, thereby increasing the service life of the equipment.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0063] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0065] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A dual differential axial flow drum threshing and separation mechanism, characterized in that: It comprises a threshing drum, a threshing concave plate, a separation drum, a separation concave plate assembly and a separation drum shaft, wherein the threshing drum and the separation drum are coaxially arranged front to back, the threshing concave plates are sleeved on the outside of the threshing drum at intervals, and the outer surface of the threshing concave plates is provided with an outer gear ring, and the separation concave plate assembly is sleeved on the outside of the separation drum at intervals; the separation drum shaft is coaxially sleeved in the separation drum and the threshing drum, one end of the separation drum shaft is fixedly connected to the separation drum, and the position of the separation drum shaft near the other end is rotationally connected to the threshing drum; the separation drum is differentially connected to the threshing drum through an internal gear assembly.

2. A dual differential axial flow drum threshing and separation mechanism according to claim 1, characterized in that: The internal gear assembly includes a gear support frame, an internal gear and an internal gear ring, wherein the internal gear ring is coaxially fixed on the inner side wall of the separation drum, the gear support frame is fixed on the threshing drum, and the internal gear is fixed on the gear support frame and meshes with the internal gear ring.

3. A dual-differential axial flow drum threshing and separation mechanism according to claim 2, characterized in that: The gear support frame includes a plurality of support plates extending radially, and an internal gear is fixed on the support plates.

4. A dual-differential axial flow drum threshing and separation mechanism according to claim 3, characterized in that: An internal gear is provided at the free end of each support plate; the width of the support plate gradually decreases from the inside to the outside.

5. A dual-differential axial flow drum threshing and separation mechanism according to claim 1, characterized in that: A hollow threshing drum shaft is fixedly provided in the threshing drum, the separation drum shaft is coaxially inserted into the hollow structure of the threshing drum shaft, the threshing drum shaft and the separation drum shaft are rotationally connected via a first bearing; the separation drum is differentially connected to the threshing drum shaft via an internal gear assembly.

6. A dual-differential axial flow drum threshing and separation mechanism according to claim 2, characterized in that: A hollow threshing drum shaft is fixedly provided in the threshing drum, and the separation drum shaft is coaxially inserted into the hollow structure of the threshing drum shaft. The threshing drum shaft and the separation drum shaft are rotatably connected via a first bearing; the gear support frame is sleeved on the separation drum shaft and fixedly connected to the threshing drum shaft, and the separation drum drives the internal gear to rotate via the internal gear ring, thereby driving the threshing drum shaft and the threshing drum to rotate differentially.

7. A dual-differential axial flow drum threshing and separation mechanism according to claim 1, characterized in that: The separation concave plate assembly includes a separation concave plate and an upper cover plate, the cross-section of the separation concave plate is a first arc structure, the upper cover plate is an arc structure, the two ends of the upper cover plate in the circumferential direction are respectively detachably connected to the two ends of the separation concave plate in the circumferential direction to form a cylindrical structure, and the cross-sectional area of ​​the cylindrical structure is larger than the area of ​​the circle where the separation concave plate is located.

8. The double differential axial flow drum threshing and separation mechanism according to claim 1, characterized in that: The outer surface of the threshing concave plate is also provided with at least one circle of coaxially arranged guide convex ribs, and the guide convex ribs are provided with auxiliary supporting rollers.

9. A dual-differential axial flow drum threshing and separation mechanism according to claim 1, characterized in that: It also includes a first power unit and a second power unit, wherein the output shaft of the first power unit is fixedly connected to one end of the separation drum shaft and drives the separation drum shaft to rotate in a first direction, and the output shaft of the second power unit is meshed with the outer gear ring through a driving gear and drives the outer gear ring to rotate in a second direction, and the first direction and the second direction are opposite.

10. A grain harvester, characterized in that: The utility model comprises a harvester body and a double-differential axial flow drum threshing and separation mechanism as described in any one of claims 1 to 9 installed on the harvester body.

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