A multi-stage forward and reverse controllable dual-shaft rotary tillage device

Abstract

This invention relates to a multi-stage forward and reverse controllable dual-shaft rotary tiller, belonging to the field of rotary tiller seeder technology. It includes a frame with side plates on both sides, and two parallel rotary tiller shafts assembled between the two side plates. A drive mechanism is mounted on the frame, configured to drive the two rotary tiller shafts to rotate in opposite directions. The drive mechanism includes a transmission gearbox, a first gear arm, a second gear arm, a linkage adjustment structure, and a telescopic mechanism. The linkage adjustment structure is configured to control the unlocking or locking of the second gear arm. The telescopic mechanism is configured to, in the unlocked state, allow the second gear arm to swing around the main rotation axis as needed, adjusting the position of one of the rotary tiller shafts and adjusting the relative position of the two rotary tiller shafts to match the optimal tillage mode, significantly broadening the scope of application. It can also precisely control the overlap of the two cutting operations and the soil spreading path.

Description

Technical Field

[0001] This invention relates to the field of rotary tillage and seeding technology, specifically to a multi-stage forward and reverse controllable dual-shaft rotary tillage device. Background Technology

[0002] The current development of agricultural industrialization, intensification, and moderately scaled operations has created an urgent demand for rotary tillage and seeding machinery. Rotary tillage seeders are combined rotary tillers with seeders, enabling them to perform multiple operations such as tilling, land preparation, ditching, ridging, sowing, and covering. They can also be supplemented with spraying, mulching, and compaction according to agronomic requirements. In order to meet the growing agricultural demand for deep tillage, deep loosening, stratified tillage, and combined operations, dual-shaft rotary tillers have emerged. Existing dual-shaft rotary tillers typically include a frame, a transmission box, and two rotary blade shafts arranged in parallel front-to-back or vertically to achieve double-layer cutting, deepen the tillage layer, and optimize the effects of soil spreading and covering. However, the relative positions (such as front-to-back distance and height difference) between the two rotary shafts of existing dual-shaft rotary tillers are fixed, making it difficult to adapt to the varying requirements of different crops for tillage depth and soil fragmentation. For example, some root crops require deep, loose soil layers, while shallow-rooted crops do not require deep tillage. When dealing with soils of different textures (such as clay and sand) and different working conditions (such as dry land and irrigated land), the fixed relative positions of the blade shafts may lead to excessive tillage resistance, increased power consumption, or unsatisfactory soil fragmentation quality. Therefore, there is an urgent need for a multi-stage forward and reverse controllable dual-shaft rotary tiller to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-stage controllable forward and reverse rotation dual-axis rotary tillage device to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a multi-stage forward and reverse controllable dual-shaft rotary tillage device, comprising a frame, on which are mounted: Two parallel rotary tillage shafts, each with multiple rotary tillage blades spirally distributed on it; A drive mechanism is configured to drive two rotary tillage shafts to rotate in opposite directions; the drive mechanism includes: A variable speed gearbox, wherein the output shaft of the variable speed gearbox is connected to a main rotating shaft; The first gear arm has a first driving gear and a first driven gear inside, and the first driving gear and the first driven gear are connected by a plurality of gear meshing. The first driving gear is mounted on the main rotating shaft and rotates synchronously with the main rotating shaft. The first driven gear is connected to the end of a rotary tillage shaft and drives the corresponding rotary tillage shaft to rotate synchronously when the first driven gear rotates. The second gear arm contains a second drive gear and a second driven gear, which are connected by several meshing gears. The second driven gear is connected to the end of another rotary tillage shaft, and when the second driven gear rotates, it drives the corresponding rotary tillage shaft to rotate synchronously. The second drive gear is mounted on the main rotating shaft. The main rotating shaft is provided with a linkage adjustment structure, which is configured to control the second drive gear to rotate synchronously with the main rotating shaft, or the second drive gear to rotate independently of the main rotating shaft. The telescopic mechanism is configured to, when the second drive gear rotates independently of the main rotation axis, drive the second gear arm to swing around the main rotation axis as needed, thereby adjusting the relative position of the second driven gear and the first driven gear.

[0005] Preferably, the frame is provided with side plates on both sides, and a first gear arm and a second gear arm, as well as a telescopic mechanism, are installed on both side plates. The first gear arm and the second gear arm on the same side plate are arranged in a V-shape. The telescopic mechanism is configured to control the second gear arm to rotate around the main rotation axis as needed, and to adjust the included angle between the first gear arm and the second gear arm.

[0006] Preferably, both side plates are provided with arc-shaped through grooves, a connector is coaxially mounted on the second driven gear, the connector is slidably mounted in the arc-shaped through groove, and the second driven gear is connected to the end of the rotary tillage shaft through the connector. The telescopic mechanism is configured to drive the connector to slide in the arc-shaped through groove to control the second gear arm to rotate around the main rotation shaft.

[0007] Preferably, the telescopic mechanism includes a telescopic cylinder, the telescopic end of which is movably connected to the connector or the end of the second gear arm near the second driven gear, and the connector slides in the arc-shaped through groove as the telescopic cylinder extends and retracts.

[0008] Preferably, the telescopic end of the telescopic cylinder is movably connected to the connector or the end of the second gear arm near the second driven gear via a crank, and the telescopic mechanism further includes a support arm. A first sliding groove is provided on the side plate. One end of the support arm is slidably installed in the first sliding groove, and the other end is movably connected to the connector or the end of the second gear arm near the second driven gear. The support arm and the crank always maintain triangular support for the connector.

[0009] Preferably, a second sliding groove is provided on the side plate at the telescopic end of the telescopic cylinder and along the telescopic direction. A support column is slidably installed in the second sliding groove. The support column is used to support the telescopic end of the telescopic cylinder and moves synchronously in the second sliding groove as the telescopic end of the telescopic cylinder extends and retracts.

[0010] Preferably, a foldable corrugated plate is installed in the arc-shaped through groove, the foldable corrugated plate fills the arc-shaped through groove and wraps the connector, and the connector slides to expand and contract.

[0011] Preferably, the main rotating shaft has multiple moving slots arranged along the axial direction in the circumferential direction, and each moving slot is provided with a moving block. The linkage adjustment structure includes: An inner shaft is installed inside the main rotating shaft and coaxially arranged, the inner shaft being configured to slide freely along the axial direction and rotate synchronously with the main rotating shaft; The first rotating gear disk is coaxially sleeved on the main rotating shaft; The second rotating gear disk is coaxially sleeved on the main rotating shaft; and One end of the moving block is connected to the inner shaft, and the other end is connected to the first rotating gear disk. It slides with the inner shaft to control the engagement or disengagement of the first rotating gear disk and the second rotating gear disk. The second rotating gear disk is configured to rotate independently of the main rotating shaft when it is separated from the first rotating gear disk. The second drive gear is coaxially mounted on the main rotating shaft and connected to the second rotating gear disk.

[0012] Preferably, the connector includes: The first connecting shaft is coaxially connected to the second driven gear; The second connecting shaft is sleeved on the first connecting shaft and is configured to slide freely along the axis of the first connecting shaft and rotate with the first connecting shaft; The second connecting shaft has a flange at the end away from the second driven gear for connecting to the end of the rotary tiller shaft.

[0013] Preferably, an arc-shaped support plate is provided at the end of the first connecting shaft away from the second driven gear.

[0014] Beneficial effects: Under the action of the first and second gear arms, the present invention can synchronously control the rotation of two rotary tillage shafts using a variable speed gearbox. Furthermore, with the cooperation of the linkage adjustment structure and the telescopic mechanism, the second gear arm can be controlled to rotate around the main rotation shaft as needed, changing the position of the second driven gear, thereby adjusting the position of one of the rotary tillage shafts and consequently adjusting the relative position of the two rotary tillage shafts. On the one hand, it can be flexibly adjusted according to different agronomic needs to match the optimal tillage mode, significantly broadening its applicability. On the other hand, it can precisely control the overlap of the two cutting operations and the soil spreading path. When fine tillage is required, the distance between the two shafts can be reduced to make the soil more finely and evenly broken up. When deep tillage and loosening are required, the height difference or front-to-back distance between the two shafts can be appropriately increased to achieve layered cutting, avoid soil blockage, and improve the smoothness of operation and the soil breaking effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the dual-axis rotary tillage device of the present invention; Figure 2 This is a side view of the dual-axis rotary tillage device of the present invention; Figure 3 This is a schematic diagram of the main rotating shaft of the present invention; Figure 4 This is a schematic diagram of the main rotating shaft and the second driven gear of the present invention; Figure 5 This is a schematic diagram of the main rotating shaft, the first driven gear, and the second gear arm of the present invention from a single perspective. Figure 6 This is a structural schematic diagram of the main rotating shaft, the first driven gear, and the second gear arm of the present invention from another perspective. Figure 7 This is a schematic diagram of the connector structure of the present invention.

[0016] Labels in the diagram: 1. Frame; 2. Side plate; 3. Rotary tiller shaft; 31. Rotary tiller blade; 4. Gearbox; 5. Main rotating shaft; 51. Moving groove; 52. Moving block; 6. First gear arm; 61. First drive gear; 62. First driven gear; 7. Second gear arm; 71. Second drive gear; 72. Second driven gear; 8. Arc-shaped through groove; 81. Foldable corrugated plate; 9. Connector; 91. First connecting shaft; 92. Second connecting shaft; 93. Flange; 94. Arc-shaped support plate; 10. Telescopic cylinder; 11. Crank; 12. Support arm; 13. First slide groove; 14. Locking bolt; 15. Second slide groove; 16. Support column; 17. Inner shaft; 18. First rotating gear disc; 19. Second rotating gear disc; 20. Tooth; 21. Adjustable telescopic cylinder. Detailed Implementation

[0017] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0018] An example is a multi-stage, controllable, dual-shaft rotary tillage device, such as... Figures 1-2 As shown, the machine includes a frame 1, side plates 2 on both sides of the frame 1, and two parallel rotary tillage shafts 3 assembled between the two side plates 2. Each rotary tillage shaft 3 has multiple rotary tillage blades 31 spirally distributed on it. A drive mechanism is mounted on the frame 1 and configured to drive the two rotary tillage shafts 3 to rotate in opposite directions. The drive mechanism includes: The output shaft of the gearbox 4 is connected to the main rotating shaft 5. The first gear arm 6 is provided with a first drive gear 61 and a first driven gear 62, and the first drive gear 61 and the first driven gear 62 are connected by several meshing gears. The first drive gear 61 is mounted on the main rotating shaft 5 and rotates synchronously with the main rotating shaft 5. The first driven gear 62 is connected to the end of a rotary tillage shaft 3, and drives the corresponding rotary tillage shaft 3 to rotate synchronously when the first driven gear 62 rotates. The second gear arm 7 is provided with a second drive gear 71 and a second driven gear 72, and the second drive gear 71 and the second driven gear 72 are connected by several gear meshing. The second driven gear 72 is connected to the end of another rotary tillage shaft 3 (the rotary tillage shaft 3 connected to the second driven gear 72 is defined as the moving rotary tillage shaft 3, hereinafter referred to as the moving rotary tillage shaft 3), and when the second driven gear 72 rotates, it drives the corresponding rotary tillage shaft 3 to rotate synchronously. The second drive gear 71 is mounted on the main rotating shaft 5. Among them, a linkage adjustment structure is provided on the main rotating shaft 5. The linkage adjustment structure is configured to control the second drive gear 71 to rotate synchronously with the main rotating shaft 5, or the second drive gear 71 to rotate independently of the main rotating shaft 5. The telescopic mechanism is configured to, when the second drive gear 71 rotates independently of the main rotating shaft 5, drive the arm of the second drive gear 71 to swing around the main rotating shaft 5 as needed, thereby adjusting the relative position of the second driven gear 72 and the first driven gear 62.

[0019] In one embodiment, reference Figure 2 As shown, a first gear arm 6 and a second gear arm 7, as well as a telescopic mechanism, are installed on both side plates 2 to simultaneously adjust the actions of both ends of the rotary tillage shaft 3. The first gear arm 6 and the second gear arm 7 on the same side plate 2 are arranged in a V-shape. The telescopic mechanism is configured to control the second gear arm 7 to rotate around the main rotating shaft 5 as needed, and to adjust the included angle between the first gear arm 6 and the second gear arm 7.

[0020] refer to Figure 2 As shown, arc-shaped through grooves 8 are provided on both side plates 2. A connector 9 is coaxially mounted on the second driven gear 72. The connector 9 is slidably installed in the arc-shaped through groove 8, and the second driven gear 72 is connected to the end of the rotary tillage shaft 3 through the connector 9. The telescopic mechanism is configured to drive the connector 9 to slide in the arc-shaped through groove 8 to control the second gear arm 7 to rotate around the main rotating shaft 5.

[0021] In one embodiment, the telescopic mechanism includes a telescopic cylinder 10, the telescopic end of which is movably connected to the connector 9 or the end of the second gear arm 7 near the second driven gear 72, and the connector 9 slides in the arc-shaped through groove 8 as the telescopic cylinder 10 extends and retracts.

[0022] In one embodiment, reference Figure 2As shown, the telescopic end of the telescopic cylinder 10 is movably connected to the connector 9 or the end of the second gear arm 7 near the second driven gear 72 via the crank 11. The telescopic end of the telescopic cylinder 10 is also movably connected to the crank 11. The telescopic mechanism also includes a support arm 12. A first slide groove 13 is provided on the side plate 2. One end of the support arm 12 is slidably installed in the first slide groove 13, and the other end is movably connected to the connector 9 or the end of the second gear arm 7 near the second driven gear 72. The support arm 12 and the crank 11 always maintain triangular support for the connector 9. During operation, the extension end of the telescopic cylinder 10 pushes the crank 11, which in turn pushes the connector 9 or the second gear arm 7 to move closer to one end of the second driven gear 72. This simultaneously drives the support arm 12 to move along the first slide groove 13. The triangular support of the crank 11 and the support arm 12 improves the stability of the static support and distributes the gravitational force generated by the rotary tiller 3 to the support arm 12 and the connection between the extension end and the crank 11, thus extending the service life of the telescopic cylinder 10. Locking bolts 14 can be installed at the connection between the extension end and the crank 11, as well as at the installation point of the support arm 12 and the first slide groove 13. After adjusting the position of the rotary tiller 3, the locking bolts 14 are used to lock the crank 11 and the support arm 12, forming a stable triangular support state.

[0023] In one embodiment, reference Figure 2 As shown, a second slide groove 15 is provided on the side plate 2 at the telescopic end of the telescopic cylinder 10 and along the telescopic direction. A support column 16 is slidably installed in the second slide groove 15. The support column 16 is used to support the telescopic end of the telescopic cylinder 10 and moves synchronously in the second slide groove 15 as the telescopic end of the telescopic cylinder 10 telescopics. By utilizing the function of the support column 16, the telescopic end can be supported, further improving its working stability.

[0024] In one embodiment, reference Figure 2 As shown, a foldable corrugated plate 81 is installed in the arc-shaped through groove 8. The foldable corrugated plate 81 fills the arc-shaped through groove and wraps the connector 9. The connector 9 slides to expand and contract, which can always keep the arc-shaped through groove 8 in a shielded state, preventing soil from passing through the arc-shaped through groove 8 during operation and affecting the normal operation of the telescopic mechanism on one side of the side plate 2, effectively separating the work on both sides independently.

[0025] In one embodiment, reference Figures 3-6 As shown, the main rotating shaft 5 is provided with a plurality of moving slots 51 arranged along the axial direction in the circumferential direction. Each moving slot 51 is provided with a moving block 52. The linkage adjustment structure includes an inner shaft 17, a first rotating gear disk 18 and a second rotating gear disk 19. The inner shaft 17 is installed in the main rotating shaft 5 and is coaxially arranged. The inner shaft 17 is configured to slide freely along the axial direction and rotate synchronously with the main rotating shaft 5. In one embodiment, reference Figure 3 As shown, multiple toothed grooves can be provided in the main rotating shaft 5 along the axial direction, and teeth 20 are installed on the inner shaft 17, so that the inner shaft 17 can be configured to slide freely along the axial direction and rotate synchronously with the main rotating shaft 5.

[0026] A first rotating gear disk 18 is coaxially sleeved on the main rotating shaft 5; a second rotating gear disk 19 is coaxially sleeved on the main rotating shaft 5; one end of a movable block 52 is connected to the inner shaft 17, and the other end is connected to the first rotating gear disk 18, and slides with the inner shaft 17 to control the engagement or disengagement of the first rotating gear disk 18 and the second rotating gear disk 19, and the second rotating gear disk 19 is configured to rotate independently of the main rotating shaft 5 when separated from the first rotating gear disk 18; Reference Figure 4 As shown, the second drive gear 71 is coaxially mounted on the main rotating shaft 5 and connected to the second rotating gear disk 19; Reference Figures 5-6 As shown, the first drive gear 61 is coaxially mounted on the main rotating shaft 5 and can rotate synchronously with the main rotating shaft 5; In the working mode: the first rotating gear 18 meshes with the second rotating gear 19, driving the main rotating shaft 5 to rotate, which in turn drives the first driving gear 61 to rotate, and through the action of multiple gears, drives the first driven gear 62 to rotate, thereby driving its corresponding rotary tillage shaft 3 to rotate. At the same time, the main rotating shaft 5 rotates, synchronously driving the first rotating gear 18 to rotate, and under the meshing action, drives the second rotating gear 19 to rotate, thereby driving the second driving gear 71 to rotate, and then through multiple gears, synchronously drives the second driven gear 72 to rotate, thereby driving its corresponding rotary tillage shaft 3 to rotate.

[0027] In the adjustment mode: In this embodiment, an adjustment telescopic cylinder 21 is set at one end of the main rotating shaft 5 to control the movement of the inner shaft 17. The movement of the inner shaft 17 causes the first rotating gear disk 18 to separate from the second rotating gear disk 19. At this time, the telescopic mechanism pushes the second gear arm 7 away from one end of the main rotating shaft 5. At this time, the second drive gear 71 rotates around the main rotating shaft 5 without driving the main rotating shaft 5 to rotate. After the position of the second gear arm 7 is adjusted, the inner shaft 17 is controlled to drive the first rotating gear disk 18 to mesh with the second rotating gear disk 19, and the working mode can be implemented.

[0028] In one embodiment, reference Figure 7As shown, connector 9 includes a first connecting shaft 91, which is coaxially connected to the second driven gear 72; a second connecting shaft 92, which is sleeved on the first connecting shaft 91 and configured to slide freely along the axis of the first connecting shaft 91 and rotate with the first connecting shaft 91; a flange 93 for connecting to the end of the rotary tiller 3 is provided at the end of the second connecting shaft 92 away from the second driven gear 72; when assembling the rotary tiller 3, the second connecting shaft 92 is pulled to sleeve onto the end of the rotary tiller 3 and fixed by the flange 93 to complete the installation; when disassembling, the connecting bolts on the flange 93 are loosened and the second connecting shaft 92 is pushed to quickly disassemble the rotary tiller 3.

[0029] Furthermore, the first driven gear 62 can also be connected to the end of the rotary tillage shaft 3 via a connector 9 of the same structure, enabling quick installation and removal of the rotary tillage shaft 3.

[0030] In one embodiment, reference Figure 7 As shown, an arc-shaped support plate 94 can be provided at the end of the first connecting shaft 91 away from the second driven gear 72. The arc-shaped support plate 94 can provide initial support for both ends of the moving rotary tiller shaft 3. Then, the second connecting shaft 92 is pulled to fit onto the end of the moving rotary tiller shaft 3 for installation. When disassembling, the arc-shaped support plate 94 can also be used to support it. After the second connecting shaft 92 is disengaged from the end of the rotary tiller shaft 3, the moving rotary tiller shaft 3 can be pushed down.

[0031] The embodiments of the present invention have been described in detail above with reference to the examples. However, the present invention is not limited to the above embodiments. For those skilled in the art, after learning the contents described in the present invention, several equivalent changes and substitutions can be made without departing from the principle of the present invention. These equivalent changes and substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A multi-stage positive and counter-rotatable controllable double-axle rotary cultivator, characterized in that: Includes a rack, on which are mounted: Two parallel rotary tillage shafts, each with multiple rotary tillage blades spirally distributed on it; A drive mechanism is configured to drive two rotary tillage shafts to rotate in opposite directions; the drive mechanism includes: A variable speed gearbox, wherein the output shaft of the variable speed gearbox is connected to a main rotating shaft; The first gear arm has a first driving gear and a first driven gear inside, and the first driving gear and the first driven gear are connected by a plurality of gear meshing. The first driving gear is mounted on the main rotating shaft and rotates synchronously with the main rotating shaft. The first driven gear is connected to the end of a rotary tillage shaft and drives the corresponding rotary tillage shaft to rotate synchronously when the first driven gear rotates. The second gear arm contains a second drive gear and a second driven gear, which are connected by several meshing gears. The second driven gear is connected to the end of another rotary tillage shaft, and when the second driven gear rotates, it drives the corresponding rotary tillage shaft to rotate synchronously. The second drive gear is mounted on the main rotating shaft. The main rotating shaft is provided with a linkage adjustment structure, which is configured to control the second drive gear to rotate synchronously with the main rotating shaft, or the second drive gear to rotate independently of the main rotating shaft. The main rotating shaft has multiple moving slots arranged along the axial direction in the circumferential direction, and each moving slot is provided with a moving block. The linkage adjustment structure includes: An inner shaft is installed inside the main rotating shaft and coaxially arranged, the inner shaft being configured to slide freely along the axial direction and rotate synchronously with the main rotating shaft; The first rotating gear disk is coaxially sleeved on the main rotating shaft; The second rotating gear disk is coaxially sleeved on the main rotating shaft; and One end of the moving block is connected to the inner shaft, and the other end is connected to the first rotating gear disk. It slides with the inner shaft to control the engagement or disengagement of the first rotating gear disk and the second rotating gear disk. The second rotating gear disk is configured to rotate independently of the main rotating shaft when it is separated from the first rotating gear disk. The second drive gear is coaxially mounted on the main rotating shaft and connected to the second rotating gear disk; The telescopic mechanism is configured to, when the second drive gear rotates independently of the main rotation axis, drive the second gear arm to swing around the main rotation axis as needed, thereby adjusting the relative position of the second driven gear and the first driven gear.

2. The multi-stage forward and reverse controllable dual-shaft rotary tillage device according to claim 1, characterized in that: The frame has side plates on both sides, and a first gear arm and a second gear arm, as well as a telescopic mechanism, are installed on both side plates. The first gear arm and the second gear arm on the same side plate are arranged in a V-shape. The telescopic mechanism is configured to control the second gear arm to rotate around the main rotation axis as needed, and to adjust the included angle between the first gear arm and the second gear arm.

3. The multi-stage forward and reverse controllable dual-shaft rotary tillage device according to claim 2, characterized in that: Both side plates are provided with arc-shaped through slots. A connector is coaxially mounted on the second driven gear. The connector is slidably mounted in the arc-shaped through slot. The second driven gear is connected to the end of the rotary tillage shaft through the connector. The telescopic mechanism is configured to drive the connector to slide in the arc-shaped through slot to control the rotation of the second gear arm around the main rotation shaft.

4. The multi-stage forward and reverse controllable dual-shaft rotary tillage device according to claim 3, characterized in that: The telescopic mechanism includes a telescopic cylinder, the telescopic end of which is movably connected to the connector or the end of the second gear arm near the second driven gear, and the connector slides in the arc-shaped through groove as the telescopic cylinder extends and retracts.

5. A multi-stage forward and reverse controllable dual-shaft rotary tillage device according to claim 4, characterized in that: The telescopic end of the telescopic cylinder is movably connected to the connector or the end of the second gear arm near the second driven gear via a crank. The telescopic mechanism also includes a support arm. A first sliding groove is provided on the side plate. One end of the support arm is slidably installed in the first sliding groove, and the other end is movably connected to the connector or the end of the second gear arm near the second driven gear. The support arm and the crank always maintain triangular support for the connector.

6. The multi-stage forward and reverse controllable dual-shaft rotary tillage device according to claim 5, characterized in that: The side plate is provided with a second sliding groove at the telescopic end of the telescopic cylinder and along the telescopic direction. A support column is slidably installed in the second sliding groove. The support column is used to support the telescopic end of the telescopic cylinder and moves synchronously in the second sliding groove as the telescopic end of the telescopic cylinder extends and retracts.

7. A multi-stage forward and reverse controllable dual-shaft rotary tillage device according to claim 3, characterized in that: A foldable corrugated plate is installed in the arc-shaped through groove. The foldable corrugated plate fills the arc-shaped through groove and wraps the connector. The connector can slide to expand and contract.

8. A multi-stage forward and reverse controllable dual-shaft rotary tillage device according to claim 3, characterized in that: The connector includes: The first connecting shaft is coaxially connected to the second driven gear; The second connecting shaft is sleeved on the first connecting shaft and is configured to slide freely along the axis of the first connecting shaft and rotate with the first connecting shaft; The second connecting shaft has a flange at the end away from the second driven gear for connecting to the end of the rotary tiller shaft.

9. A multi-stage forward and reverse controllable dual-shaft rotary tillage device according to claim 8, characterized in that: An arc-shaped support plate is provided at the end of the first connecting shaft away from the second driven gear.

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