Rotary seeding machine and automatic seeding depth adjusting method

Abstract

The invention discloses a rotary sowing machine and an automatic sowing depth adjusting method, and relates to the technical field of agricultural production.The rotary sowing machine comprises a rotary tillage device, a soil splitter and a press wheel which are sequentially arranged from front to back, the press wheel is hinged to a rack through a first connecting arm, and a first angle sensor is arranged on the first connecting arm; the front end of the first soil dividing plate is hinged to the front end of the second soil dividing plate, the front end of the second soil dividing plate is higher than the rear end of the second soil dividing plate, the first end of the connecting rod is fixed to the soil dividing device, the second end of the connecting rod is connected with the output end of the driving assembly, the fixed soil retaining plate is arranged above the soil dividing device, and the front end of the soil retaining plate is higher than the rear end of the soil retaining plate. The rear end of the soil baffle backwards exceeds the rear end of the second soil dividing plate in the horizontal direction, and a seed outlet of the seed pipe penetrates through the first soil dividing plate and is located above the second soil dividing plate. The seeding depth can be adjusted in time in the seeding process, the incorrect seeding position is avoided, manual inspection and adjustment are not needed after seeding is completed, and the seeding reliability is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural production, and particularly relates to a rotary seeder and an automatic sowing depth adjustment method. Background Art

[0002] A rotary seeder is an agricultural machine mainly used for sowing operations. When sowing, the rotary seeder moves along a predetermined sowing route to complete a series of operations including ditch opening, sowing, soil covering, and rolling. The rotary tillage device can throw the soil backward, and some soil will cover the sown seeds, and then the rolling wheel compresses the soil. Therefore, the soil thickness above the compacted seeds is the sowing depth of the seeds. The sowing depth has a significant impact on seed germination and crop growth. Sowing too deep or too shallow will affect the germination speed, emergence rate, growth state, and ultimately the yield of the seeds. The suitable sowing depths of different varieties of crops vary. Due to reasons such as soil quality, the sowing depth may not be consistent with the suitable sowing depth of the currently sown crops, resulting in the seeds being unable to germinate normally, or even if they germinate, they cannot grow into healthy plants. In the prior art, after completing a series of operations of ditch opening, sowing, soil covering, and rolling, it is necessary to manually check the sowing depth one by one and dig out and rebury the seeds with incorrect positions. Such a method is time-consuming and laborious, and there are large errors in manual operations, and still cannot effectively improve the sowing reliability. Summary of the Invention

[0003] The purpose of the present invention is to provide a rotary seeder and an automatic sowing depth adjustment method to solve the problems existing in the above prior art, timely adjust the sowing depth during the sowing process, avoid incorrect sowing positions, and effectively improve the sowing reliability.

[0004] To achieve the above object, the present invention provides the following solutions: The present invention provides a rotary seeding machine, which includes a rotary tillage device, a soil distributor, and a press wheel arranged in sequence from front to back; the soil distributor includes a first soil distribution plate and a second soil distribution plate. The first soil distribution plate is located above the second soil distribution plate. The front ends of the first soil distribution plate and the second soil distribution plate are hinged. A soft chain for connecting the second soil distribution plate is arranged inside the first soil distribution plate. The front end of the second soil distribution plate is higher than the rear end of the second soil distribution plate. The rear end of the second soil distribution plate is aligned with the rear end of the first soil distribution plate in the vertical direction. The first end of a connecting rod is fixed on the soil distributor, and the second end of the connecting rod is connected to the output end of a driving component. The driving component is arranged on a frame. A soil retaining plate is arranged above the soil distributor. The soil retaining plate is connected to the frame. The rear end of the soil retaining plate extends backward beyond the rear end of the second soil distribution plate. A seed tube is fixed on the first soil distribution plate. The seed outlet of the seed tube passes through the first soil distribution plate and is located above the second soil distribution plate; the press wheel is hinged to the frame through a first connecting arm, and a first angle sensor is arranged on the first connecting arm. A second angle sensor is arranged on the second soil distribution plate.

[0005] In one embodiment, the driving component includes a driving motor and a speed reducer. The output end of the driving motor is connected to the input end of the speed reducer, and the output end of the speed reducer is connected to the second end of the connecting rod.

[0006] In one embodiment, the output end of the speed reducer is a worm gear, and a worm is arranged at the second end of the connecting rod to cooperate with the worm gear.

[0007] In one embodiment, the connecting rod and the seed tube pass through the soil retaining plate.

[0008] In one embodiment, the part of the seed tube located between the first soil distribution plate and the second soil distribution plate includes a bending structure, and the seed outlet of the seed tube faces the rear end of the second soil distribution plate.

[0009] In one embodiment, the frame is a flat plate structure. The driving component and the seed box are arranged above the frame. The connecting rod passes through the frame and can move up and down under the drive of the driving component. The seed tube passes through the frame and is fixed on the first soil distribution plate. The seed inlet of the seed tube is movably connected to the seed outlet of the seed box; the press wheel is hinged to the lower part of the frame through the first connecting arm, the rotary tillage device is connected to the lower part of the frame through a second connecting arm, the soil distributor is arranged under the frame; the soil retaining plate is arranged under the frame.

[0010] In one embodiment, the seed tube is sleeved on the seed outlet pipe of the seed box. When the seed tube descends to the lowest position, the seed inlet of the seed tube is located above the seed outlet of the seed box.

[0011] In one embodiment, the seed inlet of the seed tube is connected to the seed outlet of the seed box through a telescopic tube.

[0012] In one embodiment, it further includes a water tank, which is connected to a water pipe for sprinkling water. The water pipe is arranged behind the press wheel, the water outlet of the water pipe faces the seed row, and a valve is arranged on the water pipe.

[0013] The present invention also provides an automatic sowing depth adjustment method, based on the above-mentioned rotary seeder, including the following steps: S1. Calculate the standard working angle range according to the standard sowing depth range. The sowing depth is the vertical distance between the horizontal section of the lowest position of the press wheel and the horizontal plane where the rear end of the second soil dividing plate is located in the vertical direction. The working angle is the included angle between the first connecting arm and the vertical direction when the press wheel contacts the soil. The standard sowing depth range is a numerical range including the maximum suitable sowing depth and the minimum suitable sowing depth determined according to sowing needs. The standard working angle range is a numerical range of the included angle between the first connecting arm and the vertical direction when the press wheel contacts the soil determined according to the standard sowing depth range; S2. Detect the working angle, and judge whether the value of the working angle falls within the standard working angle range. If it falls within, it means that the current sowing depth falls within the standard sowing depth range. If it does not fall within, then start step S3; S3. Calculate the sowing depth inversely through the working angle. If the sowing depth is greater than the maximum suitable sowing depth, the soil divider and the soil retaining plate move upward synchronously to reduce the soil covering amount until the working angle falls within the standard working angle range. If the sowing depth is less than the minimum suitable sowing depth, the soil divider and the soil retaining plate move downward synchronously to increase the soil covering amount until the working angle falls within the standard working angle range.

[0014] The technical solution of the present invention has achieved the following technical effects compared with the prior art: The present invention provides a seeding mechanism and an automatic seeding depth adjustment method. The vertical distance between the horizontal section at the lowest position of the press wheel and the horizontal plane where the rear end of the second soil dividing plate is located is taken as the seeding depth, and the angle between the first connecting arm and the vertical direction is taken as the working angle. The corresponding relationship between the seeding depth and the working angle is established. The value of the working angle is detected in real time, and the real-time seeding depth is judged through the working angle. When the seeding depth does not fall within the standard seeding depth range, the driving component is activated to drive the connecting rod to move, the connecting rod drives the soil divider to move, and the soil dividing amount of the soil divider is adjusted, so as to adjust the soil covering amount. The seeding depth changes with the change of the soil covering amount. When the seeding depth changes, the detected working angle will also change. When the working angle falls within the standard working angle range, it means that the seeding depth falls within the standard seeding depth range and no further adjustment is required. During seeding, the soil thrown backward by the rotary tillage mechanism is divided into two parts by the soil divider. One part is discharged from below the second soil dividing plate, and the other part is discharged from above the first soil dividing plate. The soil discharged from above the first soil dividing plate is the soil for covering. The seeds rolling down from the second soil dividing plate will fall on the soil discharged from below the second soil dividing plate and then be covered with soil. The rolling position of the seeds is basically on the horizontal plane where the rear end of the second soil dividing plate is located. The rear end of the soil baffle extends backward beyond the rear end of the second soil dividing plate in the horizontal direction, and the extended part is above the falling seeds. The soil rebounds from the soil baffle and falls on the seeds. The higher the position of the soil divider, the less soil can fall on the seeds. Therefore, when the current seeding depth falls within the standard seeding depth range, the seeding depth can be calculated inversely through the working angle. If the seeding depth is greater than the maximum suitable seeding depth, the soil divider moves upward to reduce the soil covering amount until the working angle falls within the standard working angle range. If the seeding depth is less than the minimum suitable seeding depth, the soil divider moves downward to increase the soil covering amount until the working angle falls within the standard working angle range. The front end of the first soil dividing plate and the front end of the second soil dividing plate are hinged, and the seed dropping position can be changed by adjusting the inclination degree of the second soil dividing plate. The soft chain can not only pull the second soil dividing plate upward when the soil divider moves upward to prevent it from turning downward, but also meet the need for the second soil dividing plate to rotate upward when it touches the ground when the soil divider moves downward. The second angle sensor can judge whether the working angle of the second soil dividing plate is normal.

[0015] The following technical effects are also achieved by other technical solutions of the present invention compared with the prior art: 1. In the present invention, the seed outlet of the seed tube faces the rear end of the second soil dividing plate. When the seeds are discharged from the seed tube, they have an initial velocity towards the rear end of the second soil dividing plate. The seeds can roll down from the second soil dividing plate faster and can also obtain a farther rolling distance, ensuring that they fall at a suitable soil covering position.

[0016] 2. In the present invention, the seed tube is sleeved on the seed outlet tube of the seed box. When the seed tube descends to the lowest position, the seed inlet of the seed tube is located above the seed outlet of the seed box, enabling the seed tube to have a lifting function while meeting the requirement that seeds can be reliably discharged from the seed box into the seed tube. Alternatively, the seed inlet of the seed tube is connected to the seed outlet of the seed box through a telescopic tube, and the seed inlet of the seed tube and the seed outlet of the seed box can still be hermetically connected after the seed tube is lifted or lowered. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 FIG. [X] is a schematic structural diagram of a rotary seeder in an embodiment of the present invention; Figure 2 FIG. [X] is a schematic diagram of the structural cooperation between the seed box and the seed tube inside the seed box in an embodiment of the present invention; Figure 3 FIG. [X] is another schematic diagram of the structural cooperation between the seed box and the seed tube inside the seed box in an embodiment of the present invention.

[0019] Among them, 1. Rotary tillage device; 2. Soil divider; 201. First soil dividing plate; 202. Second soil dividing plate; 203. Soft chain; 204. Second angle sensor; 3. Pressing wheel; 4. Connecting rod; 5. Soil retaining plate; 6. First connecting arm; 7. Frame; 8. First angle sensor; 9. Driving motor; 10. Reducer; 11. Seed box; 12. Seed tube; 13. Water tank; 14. Water pipe; 15. Valve; 16. Telescopic tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of the present invention, not all of them. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0021] In the present invention, the terms "upper" and "lower" refer to the height relationship of each structure in the working state. The structure at the highest position is the uppermost, and the structure at the lowest position is the lowermost. The terms "front" and "back" refer to the relative sequential relationship of each structure along the sowing forward direction in the working state. The position of the structure arranged at the first place is the foremost, and the position of the structure arranged at the last place is the rearmost.

[0022] The object of the present invention is to provide a rotary seeder and an automatic seeding depth adjustment method to solve the problems existing in the above-mentioned prior art, so as to timely adjust the seeding depth during seeding, avoid incorrect seeding positions, and effectively improve the seeding reliability.

[0023] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Embodiment 1 As Figures 1 to 3 shown, a rotary seeder includes a rotary tillage device 1, a soil divider 2 and a pressing wheel 3 arranged in sequence from front to back. The soil divider 2 includes a first soil dividing plate 201 and a second soil dividing plate 202. The first soil dividing plate 201 is located above the second soil dividing plate 202. The front ends of the first soil dividing plate 201 and the second soil dividing plate 202 are hinged. A soft chain 203 for connecting the second soil dividing plate 202 is arranged inside the first soil dividing plate 201. The front end of the second soil dividing plate 202 is higher than the rear end of the second soil dividing plate 202. The rear end of the second soil dividing plate 202 is aligned with the rear end of the first soil dividing plate 201 in the vertical direction. The first end of a connecting rod 4 is fixed on the soil divider 2, and the second end of the connecting rod 4 is connected to the output end of a driving component. The driving component is arranged on a frame 7. A soil retaining plate 5 is arranged above the soil divider 2. The soil retaining plate 5 is connected to the frame 7. The rear end of the soil retaining plate 5 extends backward beyond the rear end of the second soil dividing plate 202. A seed tube 12 is fixed on the first soil dividing plate 201. The seed outlet of the seed tube 12 passes through the first soil dividing plate 201 and is located above the second soil dividing plate 202. The pressing wheel 3 is hinged to the frame 7 through a first connecting arm 6. A first angle sensor 8 is arranged on the first connecting arm 6, and a second angle sensor 204 is arranged on the second soil dividing plate 202.

[0025] Working principle: When the pressing wheel 3 presses down on the soil, it will be supported by the reaction force of the soil. After pressing to a certain level, it will no longer press down. Therefore, the soil covering thickness can be regarded as the sowing depth. When the sowing position remains unchanged, the soil thickness at different sowing depths is different, resulting in different final positions where the pressing wheel 3 stops pressing down. The height of the pressing wheel 3 is related to the sowing depth. The first connecting arm 6 used to connect the pressing wheel 3 is hinged on the frame 7. When the pressing wheel 3 presses down, the first connecting arm 6 will swing. Therefore, the angle between the first connecting arm 6 and the vertical direction will also change with the change of the sowing depth. A mathematical relationship between the sowing depth and the angle between the first connecting arm 6 and the vertical direction can be established, and the sowing depth can be judged by calculation. During sowing, the soil thrown backward by the rotary tillage device 1 is divided into two parts by the soil divider 2. One part flows out from below the second soil dividing plate 202, and the other part flows out from above the first soil dividing plate 201. The seeds roll down from the second soil dividing plate 202, and the soil flowing out from above the first soil dividing plate 201 collides with the soil retaining plate 5 and then accurately falls on the seeds to complete soil covering. Subsequently, the pressing wheel 3 performs pressing. During the pressing process, the first angle sensor 8 can detect the angle between the first connecting arm 6 and the vertical direction in real time, and judge the sowing depth according to the angle. When the sowing depth does not meet the requirements, the required adjusted sowing depth can be obtained through reverse calculation. During adjustment, the driving component drives the connecting rod 4 to move, the connecting rod 4 drives the soil divider 2 to move, and the soil divider 2 moves synchronously to adjust the soil covering amount. After the pressing wheel 3 presses down, the swinging amplitude of the first connecting arm 6 changes, and the angle between the first connecting arm 6 and the vertical direction also changes. When the sowing depth corresponding to the angle between the first connecting arm 6 and the vertical direction meets the requirements, the driving component stops working and ends the adjustment. When the soil divider 2 moves upward, the distance between the rear end of the soil divider 2 and the rear end of the soil retaining plate 5 decreases, and the amount of soil flowing out from above the first soil dividing plate 201 decreases, thereby reducing the soil covering amount. When the soil divider 2 moves downward, the soil covering amount can be increased, and more soil will cover the seeds. The front ends of the first soil dividing plate 201 and the second soil dividing plate 202 are hinged, and the falling seed position can be changed by adjusting the inclination degree of the second soil dividing plate 202. The soft chain 203 can not only pull the second soil dividing plate 202 to prevent it from turning downward when the soil divider 2 moves upward, but also meet the need for the second soil dividing plate 202 to rotate upward when it touches the ground when the soil divider 2 moves downward. The second angle sensor 204 can judge whether the working angle of the second soil dividing plate 202 is normal.

[0026] In one embodiment, the driving component includes a driving motor 9 and a speed reducer 10. The output end of the driving motor 9 is connected to the input end of the speed reducer 10, and the output end of the speed reducer 10 is connected to the second end of the connecting rod 4. The driving component can also adopt a fuel engine and / or other forms of transmission structure combinations.

[0027] In one embodiment, the output end of the speed reducer 10 is a worm wheel, and the second end of the connecting rod 4 is provided with a worm that cooperates with the worm wheel. Other connection methods that can meet the driving requirements may also be used between the speed reducer 10 and the connecting rod 4.

[0028] In one embodiment, the connecting rod 4 and the seed tube 12 pass through the retaining plate 5, and the retaining plate 5 is fixed to the frame 7. The retaining plate 5 is fixed to the connecting rod 4, and the synchronous movement of the retaining plate 5 and the soil divider 2 can be achieved by relying on only one set of driving components. The retaining plate 5 can also move through an independently provided driving device.

[0029] In one embodiment, the part of the seed tube 12 located between the first soil dividing plate 201 and the second soil dividing plate 202 includes a bending structure, and the seed outlet of the seed tube 12 faces the rear end of the second soil dividing plate 202. The bending direction of the seed outlet of the seed tube 12 is the same as the inclination direction of the second soil dividing plate 202, and the seeds discharged from the seed tube 12 have an initial velocity towards the rear end of the second soil dividing plate 202 and are more likely to roll down.

[0030] In one embodiment, the frame 7 is a flat plate structure, the driving components and the seed box 11 are arranged above the frame 7, the connecting rod 4 passes through the frame 7 and can move up and down under the drive of the driving components, the seed tube 12 passes through the frame 7 and is fixed to the first soil dividing plate 201, the seed inlet of the seed tube 12 is movably connected to the seed outlet of the seed box 11, the pressing wheel 3 is hinged to the lower part of the frame 7 through the first connecting arm 6, the rotary tillage device 1 is connected to the lower part of the frame 7 through the second connecting arm, the soil divider 2 is arranged under the frame 7, and the retaining plate 5 is arranged under the frame 7.

[0031] In one embodiment, the seed tube 12 is sleeved on the seed outlet tube of the seed box 11. When the seed tube 12 descends to the lowest position, the seed inlet of the seed tube 12 is located above the seed outlet of the seed box 11. Regardless of the position of the seed tube 12 after lifting or lowering, the seed tube 12 can be sleeved on the seed outlet tube of the seed box 11, and the seeds discharged from the seed box 11 can directly enter the seed tube 12 to ensure normal seed dropping.

[0032] In an embodiment, the seed inlet of the seed tube 12 is connected to the seed outlet of the seed box 11 through a telescopic tube 16. Regardless of the position of the seed tube 12 after lifting or lowering, the seed inlet of the seed tube 12 and the seed outlet of the seed box 11 can maintain a sealed connection, and the seeds discharged from the seed box 11 can directly enter the seed tube 12 to ensure normal seed dropping.

[0033] In one embodiment, a water tank 13 is further included. The water tank 13 is connected to a water pipe 14 for sprinkling water. The water pipe 14 is arranged behind the pressing wheel 3, the water outlet of the water pipe 14 faces the furrow, and a valve 15 is arranged on the water pipe 14. The valve 15 can accurately control the on-off of the water pipe 14 and apply water according to the sowing position. The valve 15 can be a device that can be automatically turned on and off, such as an electromagnetic valve or a pneumatic valve.

[0034] Example 2 As Figures 1 to 3 shown, the present invention further provides an automatic seeding depth adjustment method, based on the above-mentioned rotary seeder, comprising the following steps: S1. Calculate the standard working angle range according to the standard seeding depth range. The seeding depth is the vertical distance in the vertical direction between the horizontal section of the lowest position of the pressure wheel 3 and the horizontal plane where the rear end of the second soil dividing plate 202 is located. The working angle is the included angle between the first connecting arm 6 and the vertical direction when the pressure wheel 3 contacts the soil. The standard seeding depth range is a numerical range including the maximum suitable seeding depth and the minimum suitable seeding depth determined according to seeding requirements. The standard working angle range is a numerical range of the included angle between the first connecting arm 6 and the vertical direction when the pressure wheel 3 contacts the soil determined according to the standard seeding depth range; S2. Detect the working angle and determine whether the value of the working angle falls within the standard working angle range. If it falls within, it means that the current seeding depth falls within the standard seeding depth range. If it does not fall within, then step S3 is started; S3. Reverse-calculate the seeding depth through the working angle. If the seeding depth is greater than the maximum suitable seeding depth, the soil divider 2 and the soil retaining plate 5 move upward synchronously to reduce the amount of soil covering until the working angle falls within the standard working angle range. If the seeding depth is less than the minimum suitable seeding depth, the soil divider 2 and the soil retaining plate 5 move downward synchronously to increase the amount of soil covering until the working angle falls within the standard working angle range.

[0035] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0036] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0037] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A rotary seeder, characterized in that: It includes a rotary tillage device (1), a soil divider (2), and a press wheel (3) arranged successively from front to back; The soil divider (2) includes a first soil dividing plate (201) and a second soil dividing plate (202). The first soil dividing plate (201) is located above the second soil dividing plate (202). The front ends of the first soil dividing plate (201) and the second soil dividing plate (202) are hinged. A flexible chain (203) for connecting the second soil dividing plate (202) is arranged inside the first soil dividing plate (201). The front end of the second soil dividing plate (202) is higher than the rear end of the second soil dividing plate (202). The rear end of the second soil dividing plate (202) is aligned with the rear end of the first soil dividing plate (201) in the vertical direction. The first end of a connecting rod (4) is fixed on the soil divider (2), and the second end of the connecting rod (4) is connected to the output end of a driving assembly. The driving assembly is arranged on a frame (7). A soil retaining plate (5) is arranged above the soil divider (2), and the soil retaining plate (5) is connected to the frame (7). The rear end of the soil retaining plate (5) extends backward beyond the rear end of the second soil dividing plate (202). A seed tube (12) is fixed on the first soil dividing plate (201), and the seed outlet of the seed tube (12) passes through the first soil dividing plate (201) and is located above the second soil dividing plate (202); The press wheel (3) is hinged to the frame (7) through a first connecting arm (6). A first angle sensor (8) is arranged on the first connecting arm (6), and a second angle sensor (204) is arranged on the second soil dividing plate (202).

2. The rotary seeder according to claim 1, wherein: The driving assembly includes a driving motor (9) and a speed reducer (10). The output end of the driving motor (9) is connected to the input end of the speed reducer (10), and the output end of the speed reducer (10) is connected to the second end of the connecting rod (4).

3. The rotary seeder according to claim 2, characterized in that: The output end of the speed reducer (10) is a worm wheel, and a worm meshing with the worm wheel is arranged at the second end of the connecting rod (4).

4. The rotary seeder according to claim 1, characterized in that: The connecting rod (4) and the seed tube (12) pass through the soil retaining plate (5).

5. The rotary seeder according to claim 1, characterized in that: The part of the seed tube (12) located between the first soil dividing plate (201) and the second soil dividing plate (202) includes a bending structure, and the seed outlet of the seed tube (12) faces the rear end of the second soil dividing plate (202).

6. The rotary seeder according to any one of claims 1 to 5, characterized in that: The frame (7) is a flat plate structure. The driving assembly and a seed box (11) are arranged above the frame (7). The connecting rod (4) passes through the frame (7) and can move up and down under the drive of the driving assembly. The seed tube (12) passes through the frame (7) and is fixed on the first soil dividing plate (201). The seed inlet of the seed tube (12) is movably connected to the seed outlet of the seed box (11); The press wheel (3) is hinged to the lower part of the frame (7) through the first connecting arm (6). The rotary tillage device (1) is connected to the lower part of the frame (7) through a second connecting arm. The soil divider (2) is arranged below the frame (7); The soil retaining plate (5) is arranged below the frame (7).

7. The rotary seeder according to claim 6, characterized in that: The seed tube (12) is sleeved on the seed outlet tube of the seed box (11). When the seed tube (12) descends to the lowest position, the seed inlet of the seed tube (12) is located above the seed outlet of the seed box (11).

8. The rotary seeder according to claim 6, wherein: The seed inlet of the seed tube (12) is connected to the seed outlet of the seed box (11) through a telescopic tube (16).

9. The rotary seeder according to claim 6, wherein: It further includes a water tank (13). The water tank (13) is communicated with a water pipe (14) for sprinkling water. The water pipe (14) is arranged behind the press wheel (3). The water outlet of the water pipe (14) faces the seed row. A valve (15) is arranged on the water pipe (14).

10. An automatic seeding depth adjustment method, characterized in that: Based on the rotary seeder according to any one of claims 1 to 9, it includes the following steps: S1. Calculate the standard working angle range according to the standard seeding depth range. The seeding depth is the vertical distance in the vertical direction between the horizontal section at the lowest position of the press wheel (3) and the horizontal plane where the rear end of the second soil dividing plate (202) is located. The working angle is the included angle between the first connecting arm (6) and the vertical direction when the press wheel (3) contacts the soil. The standard seeding depth range is a numerical range including the maximum suitable seeding depth and the minimum suitable seeding depth determined according to seeding requirements. The standard working angle range is a numerical range of the included angle between the first connecting arm (6) and the vertical direction when the press wheel (3) contacts the soil determined according to the standard seeding depth range; S2. Detect the working angle and judge whether the value of the working angle falls within the standard working angle range. If it falls within, it means that the current seeding depth falls within the standard seeding depth range. If it does not fall within, then start step S3; S3. Calculate the seeding depth by reverse calculation based on the working angle. If the seeding depth is greater than the maximum suitable seeding depth, the soil divider (2) and the soil retaining plate (5) move upward synchronously to reduce the soil covering amount until the working angle falls within the standard working angle range. If the seeding depth is less than the minimum suitable seeding depth, the soil divider (2) and the soil retaining plate (5) move downward synchronously to increase the soil covering amount until the working angle falls within the standard working angle range.

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