A seed drill

Abstract

The invention discloses a seeder, comprising a frame and a non-circular gear planetary wheel sowing mechanism, the frame is fixedly connected with a handle and is rotatably connected to a traction wheel through a rear axle; the non-circular gear planetary wheel sowing mechanism comprises a planetary frame, the planetary frame is fixedly connected to the rear axle, the planetary frame is rotatably connected to three transmission shafts, one end of the transmission shaft is fixedly connected to a non-circular planetary gear meshing with a sun gear, the other end of the transmission shaft is fixedly connected to a circular intermediate gear, the planetary frame is rotatably connected to a hollow shaft, and the hollow shaft is fixedly connected to a circular planetary gear meshing with the circular intermediate gear; a bevel gear shaft fixedly connected to the planetary frame is sleeved in the hollow shaft, and the bevel gear shaft is fixedly connected to a small bevel gear; one end of the hollow shaft is fixedly connected to a seed meter, a large bevel gear meshing with the small bevel gear is rotatably connected in the seed meter, the transmission shaft of the large bevel gear is fixedly connected to a seeding wheel, the seeding wheel is provided with a slotted hole, and the lower end of the seed meter is connected to a hole former, so as to achieve precise sowing and reduce damage to the ground film.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural equipment, in particular to a seeder. Background Art

[0002] A seeder is a planting machine used for sowing crops and seeds. It boasts uniform sowing, consistent seed depth, stable row spacing, good soil cover, seed conservation, and high efficiency. However, the hole formers of existing seeders cannot maintain a vertical downward position during sowing. Firstly, this causes the seeds to land in the soil at an offset position and shallowly. Secondly, when sowing on ground covered with mulch, the duckbill hole formers can easily create large cracks in the mulch, reducing its water and heat retention properties. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the object of the present invention is to provide a seed drill that not only achieves precise seeding but also reduces damage to the ground film.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A seed drill comprises a frame and a non-circular gear planetary wheel seeding mechanism, wherein the frame is fixedly connected to a handle, the bottom of the frame is rotatably connected to a traction wheel via a rear axle, and the frame is fixedly connected to a fixed frame;

[0006] The non-circular gear planetary wheel seeding mechanism includes a planet carrier and a sun gear fixedly connected to a fixed frame, the planet carrier and the sun gear are both provided with a through hole, the rear shaft passes through the through hole and is fixedly connected to the planet carrier, the planet carrier is rotatably connected to three transmission shafts, one end of the transmission shaft is fixedly connected to a non-circular planetary gear, the non-circular planetary gear is meshed with the sun gear, the other end of the transmission shaft is fixedly connected to a circular intermediate gear, the left side of the planet carrier is rotatably connected to a hollow shaft, the hollow shaft is fixedly sleeved with a circular planetary gear, and the circular planetary gear is meshed with the circular intermediate gear;

[0007] A bevel gear shaft is sleeved inside the hollow shaft, the bevel gear shaft is fixedly connected to the planetary carrier, and the bevel gear shaft is fixedly connected to a small bevel gear; one end of the hollow shaft is fixedly connected to a seed meter, and a large bevel gear is rotatably connected inside the seed meter, and the large bevel gear is meshed with the small bevel gear. The transmission shaft of the large bevel gear is fixedly connected to a seed wheel, and the seed wheel is provided with slots for seed discharge, and the lower end of the seed meter is connected to a duckbill-shaped hole former that can be opened and closed.

[0008] Furthermore, the cavitation device includes a first cavitation device fixedly connected to the seed metering device, the first cavitation device is hingedly connected to a second cavitation device through a torsion spring assembly, and a top block is fixedly installed on the outer side of the second cavitation device;

[0009] The torsion spring assembly includes a rotating shaft rotatably connected to the first cavitation device and the second cavitation device and a torsion spring sleeved on the rotating shaft, and two ends of the torsion spring are respectively clamped with the inner surfaces of the first cavitation device and the second cavitation device.

[0010] Furthermore, the sun gear and the non-circular planetary gear are both three-step elliptical gears, and the non-circular planetary gear and the sun gear have the same structural parameters.

[0011] Furthermore, the transmission ratio between the circular intermediate gear and the circular planetary gear is 1:3.

[0012] Furthermore, the transmission ratio between the large bevel gear and the small bevel gear is 1:3.

[0013] Furthermore, the ratio of the distance r1 between the sun gear and the circular planetary gear to the distance r2 between the circular planetary gear and the end of the cavitation device is 1.36 to 1.71.

[0014] Furthermore, the eccentricity of the non-circular planetary gear and the sun gear varies in the range of 0.05 to 0.2.

[0015] Furthermore, the bottom of the frame is rotatably connected to a guide wheel via a front axle.

[0016] Compared with the prior art, the present invention has the following technical effects:

[0017] When the traction wheel of the present invention rotates, the planetary carrier coaxially connected thereto rotates, driving the non-circular planetary gear to rotate, and then driving the circular intermediate gear to rotate, and driving the circular planetary gear to rotate, so that the seed meter rotates; at the same time, the rotation of the planetary carrier drives the bevel gear shaft and the small bevel gear to rotate, thereby transmitting the large bevel gear to rotate, and then the seed meter rotates, so that the seeds can fall into the hole former, and the hole former completes the sowing, which has a simple structure and is easy to operate; the key is that the sun gear and the three non-circular planetary gears constitute a first-stage planetary gear train for variable speed movement, so that when the hole former reaches the sowing position, its speed is reduced, thereby ensuring accurate sowing, and the three circular intermediate gears and the circular planetary gears respectively meshed with them constitute a second-stage planetary gear train for forming a specific trajectory, so that the motion trajectory of the hole former forms a hypocycloid, and the hole former completes the sowing action in a nearly vertical posture, which facilitates the seeds to fall into a deeper position in the soil, and the hole former will not scratch a large crack on the ground film, thereby ensuring the water retention and heat insulation performance of the ground film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the exploded structure of the non-circular gear planetary wheel seeding mechanism of the present invention;

[0020] Figure 3 This is a diagram showing the running trajectory of the terminal end of the cavitation device of the present invention;

[0021] Figure 4 It is a right side view of the non-circular gear planetary wheel seeding mechanism of the present invention;

[0022] Figure 5 This is a schematic diagram of the partial structure of the non-circular gear planetary wheel seeding mechanism of the present invention;

[0023] In the figure: 1. Frame; 2. Guide wheel; 3. Front axle; 4. Traction wheel; 5. Rear axle; 6. Non-circular gear planetary wheel seeding mechanism; 7. Handrail; 8. Seeder; 9. Top block; 10. Seeder; 11. Large bevel gear; 12. Seeder wheel; 13. Circular intermediate gear; 14. Planet carrier; 15. Transmission shaft; 16. Sun gear; 17. Fixed frame; 18. Non-circular planetary gear; 19. Bevel gear shaft; 20. Hollow shaft; 21. Circular planetary gear; 22. End track of the seeding mechanism. DETAILED DESCRIPTION

[0024] The specific contents of the present invention are further explained in detail below with reference to the embodiments.

[0025] like Figures 1 to 5 As shown, a seed drill includes a frame 1 and a non-circular gear planetary wheel seeding mechanism 6. The frame 1 is fixedly connected to a handle 7. The bottom rear end of the frame 1 is rotatably connected to a traction wheel 4 via a rear axle 5. The bottom front end of the frame 1 is rotatably connected to a guide wheel 2 via a front axle 3. The bottom of the frame 1 is fixedly mounted with a fixing frame 17 via threads.

[0026] The non-circular gear planetary wheel sowing mechanism 6 includes a planet carrier 14 and a sun gear 16 fixedly connected to a fixed frame 17. Both the planet carrier 14 and the sun gear 16 are provided with a through hole. The diameter of the through hole provided in the sun gear 16 is much larger than the diameter of the rear axle 5. The through hole provided on the planet carrier 14 matches the diameter of the rear axle 5, so that the rear axle 5 passes through the through hole and is fixedly connected to the planet carrier 14. The planet carrier 14 is rotatably connected to three transmission shafts 15. One end of the transmission shaft 15 is fixedly connected to a non-circular planetary gear 18, which meshes with the sun gear 16. The other end of the transmission shaft 15 is fixedly connected to a circular intermediate gear 13. The left side of the planet carrier 14 is rotatably connected to a hollow shaft 20. The hollow shaft 20 is fixedly sleeved with a circular planetary gear 21, which meshes with the circular intermediate gear 13.

[0027] The sun gear 16 and the non-circular planetary gears 18 are both third-order elliptical gears, and the three non-circular planetary gears 18 have the same structural parameters as the sun gear 16. The eccentricity of the non-circular planetary gears 18 and the sun gear 16 varies in the range of 0.05 to 0.2. The sun gear 16 and the three non-circular planetary gears 18 constitute a first-stage planetary gear train for variable speed motion; the three circular intermediate gears 13 and the circular planetary gears 21 respectively meshing therewith constitute a second-stage planetary gear train for forming a specific trajectory;

[0028] The hollow shaft 20 is internally sleeved with a bevel gear shaft 19, which is fixedly connected to the planetary carrier 14, and the bevel gear shaft 19 is fixedly connected to a small bevel gear; one end of the hollow shaft 20 is fixedly connected to a seed metering device 10, and the seed metering device 10 is internally rotatably connected to a large bevel gear 11, which meshes with the small bevel gear, and the transmission shaft of the large bevel gear 11 is fixedly connected to a seeding wheel 12, which has slots for seed discharge, and the lower end of the seeding device 10 is connected to a duckbill-shaped hole-forming device 8 that can be opened and closed;

[0029] When the seeder is pushed forward by the handle 7, the traction wheel 4 rotates, causing the rear axle 5 to drive the planetary carrier 14 to rotate, thereby driving the non-circular planetary gear 18 to rotate. When the non-circular planetary gear 18 rotates, the circular intermediate gear 13 coaxially connected thereto also rotates, and then drives the circular planetary gear 21 to rotate, driving the seed meter 10 fixedly mounted on one end of the hollow shaft 20 to rotate. The running track 22 of the end of the duckbill-shaped hole-forming device 8 fixedly connected to the lower end of the seed meter 10 is as shown in FIG. Figure 3 As shown, due to the variable speed operation of the first-stage planetary gear train, the speed of the burrowing device 8 is reduced when it reaches the sowing position, ensuring accurate sowing. The second-stage planetary gear train causes the motion trajectory of the burrowing device 8 to form a hypocycloid, ensuring that the burrowing device 8 completes the sowing action in a nearly vertical posture during sowing, allowing the seeds to fall deeper into the soil without creating large cracks in the ground film, thereby not significantly reducing the water retention and heat insulation properties of the ground film.

[0030] When the planet carrier 14 rotates, the bevel gear shaft 19 rotates accordingly, thereby causing the small bevel gear to drive the large bevel gear 11 to rotate, and the seeding wheel 12 coaxially connected to the large bevel gear 11 rotates accordingly. When the planet carrier 14 rotates one circle, the seeding wheel 12 also rotates one circle, causing the seeds to be discharged from the slots opened on its surface and fall into the duckbill-shaped hole-forming device 8;

[0031] The hole former 8 includes a first hole former fixedly connected to the seed metering device 10, the first hole former is hinged to the second hole former through a torsion spring assembly, and a top block 9 is fixedly installed on the outside of the second hole former; the torsion spring assembly includes a rotating shaft rotatably connected to the first hole former and the second hole former and a torsion spring sleeved on the rotating shaft, and the two ends of the torsion spring are respectively engaged with the inner surfaces of the first hole former and the second hole former. When the tip of the duckbill hole former 8 is inserted into the soil, the top block 9 contacts the ground. Under the reaction force of the ground, the top block 9 is pushed upward, thereby driving the tip end of the duckbill hole former 8 to open, and the seeds fall from the duckbill hole former 8 into the soil. When the duckbill hole former 8 is pulled out of the soil, the soil covers the seeds, and the sowing is completed.

[0032] Preferably, the transmission ratio between the circular intermediate gear 13 and the circular planetary gear 21 is 1:3.

[0033] Preferably, the transmission ratio between the large bevel gear 11 and the small bevel gear is 1:3.

[0034] Preferably, the horizontal distance between the sun gear 16 and the circular planetary gear 21 is set to r1, the horizontal distance between the circular planetary gear 21 and the end of the cavitation device 8 is set to r2, and the value range of r1 / r2 is 1.36-1.71.

Claims

1. A seed drill, characterized in that: The invention comprises a frame (1) and a non-circular gear planetary wheel type seeding mechanism (6), wherein the frame (1) is fixedly connected to a handle (7), the bottom of the frame (1) is rotatably connected to a traction wheel (4) via a rear axle (5), and the frame (1) is fixedly connected to a fixed frame (17); The non-circular gear planetary wheel seeding mechanism (6) comprises a planet carrier (14) and a sun gear (16) fixedly connected to a fixed frame (17); the planet carrier (14) and the sun gear (16) are both provided with through holes; the rear axle (5) passes through the through holes and is fixedly connected to the planet carrier (14); the planet carrier (14) is rotatably connected to three transmission shafts (15); one end of the transmission shaft (15) is fixedly connected to a non-circular planetary gear (18); the non-circular planetary gear (18) is meshed with the sun gear (16); the other end of the transmission shaft (15) is fixedly connected to a circular intermediate gear (13); the left side of the planet carrier (14) is rotatably connected to a hollow shaft (20); the hollow shaft (20) is fixedly sleeved with a circular planetary gear (21); the circular planetary gear (21) is meshed with the circular intermediate gear (13); The sun gear (16) and the non-circular planetary gear (18) are both three-step elliptical gears, and the non-circular planetary gear (18) and the sun gear (16) have the same structural parameters; A bevel gear shaft (19) is sleeved inside the hollow shaft (20), the bevel gear shaft (19) is fixedly connected to the planetary frame (14), and the bevel gear shaft (19) is fixedly connected to a small bevel gear; one end of the hollow shaft (20) is fixedly connected to a seed metering device (10), the seed metering device (10) is rotatably connected to a large bevel gear (11) inside, the large bevel gear (11) is meshed with the small bevel gear, and the transmission shaft of the large bevel gear (11) is fixedly connected to a seeding wheel (12), the seeding wheel (12) is provided with slots for seed discharge, and the lower end of the seed metering device (10) is connected to a duckbill-shaped hole former (8) that can be opened and closed.

2. The seed drill according to claim 1, characterized in that The cavitation device (8) comprises a first cavitation device fixedly connected to the seed metering device (10), the first cavitation device is hingedly connected to a second cavitation device via a torsion spring assembly, and a top block (9) is fixedly installed on the outer side of the second cavitation device; The torsion spring assembly includes a rotating shaft rotatably connected to the first cavitation device and the second cavitation device and a torsion spring sleeved on the rotating shaft, and two ends of the torsion spring are respectively clamped with the inner surfaces of the first cavitation device and the second cavitation device.

3. The seed drill according to claim 1, characterized in that The transmission ratio between the circular intermediate gear (13) and the circular planetary gear (21) is 1:

3.

4. The seed drill according to claim 1 or 2, characterized in that: The transmission ratio between the large bevel gear (11) and the small bevel gear is 1:

3.

5. The seed drill according to claim 1 or 2, characterized in that: The ratio of the horizontal distance r1 between the sun gear (16) and the circular planetary gear (21) to the horizontal distance r2 between the circular planetary gear (21) and the end of the cavitation device (8) is 1.36 to 1.

71.

6. The seed drill according to claim 1, characterized in that The eccentricity of the non-circular planetary gear (18) and the sun gear (16) varies in the range of 0.05 to 0.

2.

7. The seed drill according to claim 1 or 2, characterized in that: The bottom of the frame (1) is rotatably connected to a guide wheel (2) via a front shaft (3).

Images