Pot clamping type seedling taking mechanism of vegetable transplanter

Abstract

The invention relates to a pot clamping type seedling taking mechanism of a vegetable transplanter. The pot clamping type seedling taking mechanism comprises a rack, and a driving device, a motion conversion device, a seedling taking arm transverse shaft, two seedling taking needles and a seedling pushing arm are mounted on the rack; when the seedling taking arm transverse shaft obliquely moves downwards along the linear section of the preset track, the boss of the cam rotates along with the seedling taking arm transverse shaft, and the distance between the lower parts of the two seedling taking needles is reduced so as to perform seedling clamping action; when the transverse shaft of the seedling taking arm moves upwards from the bottom end of the arc-shaped section to the top end of the arc-shaped section, the seedling taking needles are changed from inclined downward to vertical downward, the boss of the cam leaves the two seedling taking needles, the first spring resets to reduce the distance between the tops of the two seedling taking needles, and the distance between the lower parts of the two seedling taking needles is increased to loosen pot seedlings; meanwhile, the other end of the cam pushes the seedling pushing arm to rotate, so that the two seedling pushing rods slide to the lower end of the seedling taking needle on the seedling taking needle, and the seedling pushing action is further realized. The movement process is not blocked, the failure rate is low, and the production efficiency of vegetable transplanting is improved.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a seedling-grabbing mechanism for a vegetable transplanter. Background Technology

[0002] In recent years, with the large-scale development of my country's vegetable planting industry, vegetable transplanters have been increasingly widely used in agricultural production. Seedling transplanting technology has significant advantages, not only increasing vegetable yield and reducing labor intensity, but also effectively avoiding the impact of severe weather and facilitating standardized field management.

[0003] The prior art discloses a seedling picking device for a fully automatic potted seedling transplanter, including a frame, a drive unit, a motion conversion device, and a seedling picking device; the motion conversion device is used to convert the output of the drive unit into the seedling picking device moving back and forth along a preset track; the preset track includes a vertically extending arc segment and a straight segment connected to the lower end of the arc segment and extending obliquely downward; when the seedling picking device moves obliquely downward along the preset track, the seedling picking device performs a seedling clamping action; when the seedling picking device moves upward along the preset track, the seedling picking device performs a seedling throwing action. The seedling taking device includes a seedling claw connecting plate, a seedling claw fixing plate, a support plate, multiple single claws, multiple wedge blocks, and a tensioning rod. The seedling claw connecting plate is sleeved on the camshaft. The end of the seedling claw connecting plate is provided with a support arm, which is slidably connected to the guide rail groove. The seedling claw fixing plate is fixed to the seedling claw connecting plate. The support plate is spaced apart on one side of the seedling claw fixing plate. The tensioning rod passes through the seedling claw fixing plate and its two ends are fixed to the cam plate and the support plate, respectively. Multiple single claws are ringed outside the tensioning rod and pass through the support plate and are fixed to the seedling claw fixing plate. Multiple wedge blocks are installed one-to-one with the multiple single claws. The cross-section of the wedge blocks gradually decreases from top to bottom. Each wedge block is movably inserted through the support plate. When the cam plate moves upward, the tension rod connected to the cam plate will pull the support plate upward. When the support plate moves upward, the wedge block passes through the support plate. Due to the inclination angle of the wedge block, under the interaction of forces, the support plate will move all the single claws inward at the same time to realize the seedling clamping action. When the cam plate moves downward, it will drive the tension rod and the support plate to move downward. The support plate will disengage from the wedge block, and the single claws will open outward to realize the seedling placement action.

[0004] It has the following technical problems:

[0005] During the movement of the support plate, the wedge block may sometimes get stuck in the support plate, causing it to move poorly and resulting in seedling picking or placing failures, which reduces production efficiency. Summary of the Invention

[0006] To address the problems existing in the prior art, the purpose of this invention is to provide a seedling-grabbing mechanism for a vegetable transplanter that can automatically pick up and place seedlings, has a low failure rate, and improves the production efficiency of vegetable transplanting.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A seedling-grabbing mechanism for a vegetable transplanter includes a frame, on which a drive unit, a motion conversion unit, a seedling-grabbing arm horizontal axis, two seedling-grabbing needles, and a seedling-pushing arm are mounted.

[0009] The seedling-picking arm is sleeved with a seedling-picking execution arm. The middle of the two seedling-picking needles is hinged to the seedling-picking execution arm. The upper ends of the two seedling-picking needles are connected by a first spring. A cam is provided between the two seedling-picking needles. The cam is fixed to the horizontal axis of the seedling-picking arm. Bosses are provided on both sides of one end of the cam. The bosses rotate and abut against the top of the two seedling-picking needles. The middle of the seedling-pushing arm is hinged to the seedling-picking execution arm. The top of the seedling-pushing arm and the seedling-picking execution arm are connected by a second spring, so that the top of the seedling-pushing arm fits against the other end of the cam. Two seedling-pushing rods are hung at the bottom of the seedling-pushing arm. The lower ends of the two seedling-pushing rods are respectively sleeved on the lower parts of the two seedling-picking needles.

[0010] The motion conversion device is connected to the drive device and the horizontal axis of the seedling arm respectively, and is used to convert the output of the drive device into the rotation of the horizontal axis of the seedling arm and its back-and-forth movement along a preset track; the preset track includes a vertically extending arc segment and a straight segment connected to the lower end of the arc segment and extending obliquely downward.

[0011] When the horizontal axis of the seedling-picking arm moves diagonally downward along the straight section, the seedling-picking needle changes from vertically downward to tilted forward. The cam's boss rotates with the horizontal axis of the seedling-picking arm and overcomes the spring force of the first spring, increasing the distance between the tops of the two seedling-picking needles, thereby reducing the distance between the lower parts of the two seedling-picking needles to perform the seedling-clamping action. When the horizontal axis of the seedling-picking arm moves from the straight section to the arc section, the two seedling-picking needles complete the seedling clamping and enter the seedling placement stage. When the horizontal axis of the seedling-picking arm moves upward from the bottom of the arc section to the top of the arc section, the seedling-picking needle changes from tilted downward to vertically downward. The cam's boss moves away from the two seedling-picking needles, the first spring resets, reducing the distance between the tops of the two seedling-picking needles, increasing the distance between the lower parts of the two seedling-picking needles to release the seedlings in the pot. At the same time, the other end of the cam pushes the seedling-pushing arm to rotate, causing the two seedling-pushing rods to slide on the seedling-picking needles to the lower end of the seedling-picking needles, thereby realizing the seedling-pushing action.

[0012] Furthermore, the seedling-taking arm is fixedly connected to a support sheet metal. The two ends of the second spring are respectively connected to the top of the seedling-pushing arm and the support sheet metal. A cylindrical pin is provided on the support sheet metal. The cylindrical pin is located between the two seedling-taking needles. The middle part of the seedling-pushing arm is hinged to the cylindrical pin.

[0013] Furthermore, the top of the seedling needle is equipped with a ball bolt, and the boss of the cam rotates to abut against the ball bolt.

[0014] Furthermore, a first roller is provided at the top of the seedling pusher arm, and the first roller is attached to the other end of the cam.

[0015] Furthermore, the other end of the cam has an arc-shaped outer contour with a concave waist and a protruding bottom. This arc-shaped outer contour rolls on the first roller to cause the seedling pushing arm to drive the seedling pushing rod to perform the seedling pushing action.

[0016] Furthermore, the motion conversion device includes a seedling-picking slide rail, which has a preset track with a J-shaped structure. The top of the seedling-picking execution arm is provided with a second roller, and the lower part of the seedling-picking execution arm is sleeved on the horizontal axis of the seedling-picking arm. The second roller and the horizontal axis of the seedling-picking arm are respectively rotatably connected to the preset track.

[0017] Furthermore, the motion conversion device also includes a gearbox, which contains a gearbox power input shaft, a gear mounting plate, planetary gears, a sun gear, and a gearbox power output shaft. The gearbox power input shaft is fixedly connected to the gear mounting plate, which has planetary gears that mesh with the sun gear. The planetary gears also have a gearbox power output shaft connected to the horizontal shaft of the seedling arm. A drive device is connected to the gearbox power input shaft and is used to drive the gearbox power input shaft to rotate the gear mounting plate. The mounting plate then drives the planetary gears to rotate and perform linear reciprocating motion.

[0018] Furthermore, a support gear is also installed on the gear mounting spoke. The support gear and the planetary gear are respectively located at both ends of the gear mounting spoke, and the support gear meshes with the sun gear.

[0019] Furthermore, the gear ratio between the planetary gear and the sun gear is 1:2, and the gear ratio between the support gear and the sun gear is 1:4.

[0020] Furthermore, the drive unit includes a stepper motor, a drive sprocket, a chain, and a driven sprocket. The stepper motor drives the drive sprocket to rotate, the drive sprocket drives the driven sprocket to rotate via the chain, and the driven sprocket is connected to the power input shaft of the gearbox.

[0021] In summary, the present invention has the following advantages:

[0022] This invention utilizes a cam's protrusion to open the tops of two seedling-picking needles, employing a lever principle to reduce the distance between the lower parts of the two needles, thus achieving seedling picking. As the cam rotates with the horizontal axis of the seedling-picking arm, the cam's protrusion moves away from the tops of the needles, the first spring resets, reducing the distance between the tops of the two needles, and using the lever principle to increase the distance between the lower parts of the needles, thereby releasing the seedling. Simultaneously, the cam drives the seedling-pushing arm to rotate, causing two seedling-pushing rods to slide downwards on the needles, pushing the seedling out from between the needles, completing the entire seedling picking and pushing process. The movement of the cam, seedling-pushing arm, and seedling-pushing rods is smooth and uninterrupted, resulting in a low failure rate and improved production efficiency for vegetable transplanting. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the seedling-collecting mechanism of the present invention.

[0024] Figure 2 This is a schematic diagram of the seedling-collecting mechanism of the present invention from another perspective.

[0025] Figure 3(a) is a schematic diagram of the planetary gear structure.

[0026] Figure 3(b) is a schematic diagram of the structure of the seedling extraction arm.

[0027] Figure 4 The diagram shows the structure of the seedling picking claw and the seedling pushing device, where (a) is a structural diagram from the first perspective, (b) is a structural diagram from the second perspective, (c) is a structural diagram from the third perspective, and (d) is a structural diagram after one of the seedling picking claws has been removed.

[0028] Figure 5 This is a schematic diagram of the seedling pusher arm.

[0029] Figure 6 This is a schematic diagram of the cam structure.

[0030] Figure 7 This is a schematic diagram illustrating the working principle of a cam.

[0031] In the picture:

[0032] 11-Driven sprocket, 12-Chain, 13-Tensioner, 14-Tensioner bracket, 15-Stepper motor, 16-Drive sprocket, 17-Drive shaft bearing housing, 18-Tension spring, 19-Drive shaft, 110-Frame;

[0033] 21-Gearbox power input shaft, 22-Drive block, 23-Gearbox power output shaft, 24-Planetary gear mounting shaft, 25-Sun gear, 26-Planetary gear, 27-Gear mounting spoke, 28-Support gear, 29-Support gear mounting shaft;

[0034] 31-Output shaft connector, 32-Mechanism support frame, 33-Seedling pick-up slide rail support rod, 34-Seedling pick-up execution arm, 341-Second roller, 35-Seedling pick-up slide rail, 36-Seedling pick-up arm horizontal shaft, 37-Ball bolt, 38-Seedling pick-up needle, 381-First spring, 39-Cam, 391-Boss, 392-Arc-shaped outer contour;

[0035] 41-Seedling claw, 42-Seedling pusher arm, 421-First roller, 43-Support sheet metal, 431-Second spring, 432-Cylindrical pin, 44-Seedling pusher rod, 441-Ring component. Detailed Implementation

[0036] The present invention will now be described in further detail.

[0037] like Figure 1 , Figure 2 As shown, a seedling-grabbing mechanism for a vegetable transplanter includes a frame 110, a drive unit, a motion conversion device, a seedling-grabbing arm horizontal axis 36, two seedling-grabbing needles 38, and a seedling-pushing arm 42, etc.

[0038] The drive unit uses a stepper motor 15 to power the seedling-collecting mechanism. The stepper motor 15 is connected to the drive shaft 19 via a coupling. The drive shaft 19 is mounted on a drive shaft bearing seat 17, which is bolted to the frame 110. The rotation of the motor drives the drive shaft to rotate as well. A chain drive drive sprocket 16 is mounted on the drive shaft, and the drive sprocket 16 moves with the drive shaft. A tension wheel bracket 14 is welded to the frame 110. The tension wheel 13 is welded to the bracket and can rotate around the tension wheel bracket 14. The tension wheel 13 spreads the chain 12, and tension is provided by a tension spring 18. The driven sprocket 11 is mounted on the gearbox power input shaft 21. The three sprockets are connected by a chain 12, transmitting power to the gearbox.

[0039] As shown in Figure 3(a), the chain drive transmits power to the gearbox power input shaft 21 of the seedling picking mechanism. The gearbox power input shaft 21 is welded to the gear mounting spoke 27 inside the gearbox. The rotation of the shaft drives the gear mounting spoke 27 to rotate. Three gear mounting shafts are welded to the other side of the gear mounting spoke 27. One shaft is the planetary gear mounting shaft 24, and the other two shafts are the support gear mounting shafts 29. The planetary gear mounting shaft 24 mounts the planetary gear 26. The gear ratio of the planetary gear 26 to the sun gear 25 is 1:2. The planetary gear 26 is rigidly connected to the drive block 22 by bolts. The gearbox power output shaft 23 is welded to the drive block 22. While the mounting spoke rotates, it drives the planetary gear 26 to rotate. At the same time, the planetary gear 26 meshes with the sun gear 25. Due to the gear meshing, the planetary gear 26 rotates around the gear power input shaft and also rotates around its own mounting shaft. Under the combined action of the planetary gear 26 rotating around the gearbox power input shaft 21 and rotating around its own shaft, the gearbox power output shaft 23 simultaneously rotates and reciprocates linearly. Two support gears 28 of the same size are respectively mounted on the two support gear mounting shafts 29. The support gears 28 mesh with the sun gear 25, and the gear ratio is 1:4. They perform the same motion as the planetary gears 26 in the gearbox, and play a role in balancing rotational inertia and providing support.

[0040] like Figure 1 Figure 3(a), Figure 3(b) Figure 4 , Figure 6As shown, the gearbox power output shaft 23 and the seedling arm horizontal shaft 36 are rigidly connected via the output shaft connector 31, providing power to the seedling arm 34. Cams 39 are symmetrically mounted at both ends of the seedling arm horizontal shaft 36, with the seedling arm 34 mounted in the middle. One end of the cam 39 has bosses 391 on both sides, and the other end has an arc-shaped outer contour 392 with a concave waist and a protruding bottom. A bearing is installed in the middle of the seedling arm 34, and the seedling arm horizontal shaft 36 passes through the inner hole of the bearing, allowing the seedling arm 34 to rotate on it. A second roller 341 is provided at the upper end of the seedling arm 34, and the second roller 341 is embedded in the seedling slide rail 35. The support rod 33 of the seedling slide rail 35 is welded to the mechanism support frame 32. The seedling slide rail 35 is fixed to the support rod 33 by bolts to limit the movement of the seedling arm 34. The seedling-picking slide rail 35 is equipped with a preset track, including a vertically extending arc segment and a straight segment connected to the lower end of the arc segment and extending obliquely downward. When the gearbox power output shaft 23 moves downward, it pushes the seedling-picking actuator arm 34 to slide downward. Under the constraint of the seedling-picking slide rail 35, the direction of the seedling-picking claw 41 changes from vertically downward to obliquely forward (i.e., parallel to the straight segment of the seedling-picking slide rail 35), and the seedling-picking action is performed. At the same time, the cams 39 at both ends of the seedling-picking arm horizontal shaft 36 rotate with the seedling-picking arm horizontal shaft 36. During the rotation, the bosses 391 on the side of the cams 39 will push open the ball bolts 37 on the top of the two seedling-picking needles 38 to both sides. Due to the leverage effect, the distance between the tips of the seedling-picking needles 38 decreases, realizing the clamping action. After the clamping action ends, when the gearbox power output shaft 23 moves upward, the seedling-picking actuator arm 34 moves accordingly. When the first roller 421 at the top of the seedling-picking actuator arm 34 enters the arc-shaped section of the seedling-picking slide rail 35, under the constraint of the seedling-picking slide rail 35, the seedling-picking needle 38 rotates from tilted downward to vertically downward. The cam 39 rotates, causing the ball bolt 37 at the top of the seedling-picking needle 38 to leave the boss 391, increasing the distance between the tips of the seedling-picking needles 38 and releasing the seedling in the pot. At the same time, the arc-shaped outer contour at the other end of the cam 39 pushes the first roller 421 at the top of the seedling-pushing device. The seedling-pushing device includes a seedling-pushing device support sheet metal 43, a seedling-pushing arm 42, and a seedling-pushing rod 44. The seedling-pushing device support sheet metal 43 is bolted to the seedling-picking actuator arm 34 and is located between the two seedling-picking needles 38 of the seedling-picking claw 41.

[0041] like Figure 5As shown, a cylindrical pin 432 is welded to the supporting sheet metal 43 of the seedling pushing device. The middle part of the seedling pushing arm 42 is fitted onto the cylindrical pin 432 and can rotate. A first roller 421 is fitted to the top of the seedling pushing arm 42. The first roller 421 and the cam 39 form a cam 39 mechanism. Two seedling pushing rods 44 are hung at the bottom of the seedling pushing arm 42. An annular part 441 is fixed to the lower end of the seedling pushing rod 44. The annular part 441 is fitted onto the lower end of the seedling picking needle 38. The seedling picking needle 38 can slide smoothly within the annular part 441. At the same time, the annular part 441 increases the contact area between the seedling pushing rod 44 and the potted seedling when pushing the seedling, which is conducive to pushing the potted seedling out smoothly and avoiding the damp potted seedling sticking to the seedling picking needle 38. The upper ends of the two seedling picking needles 38 are connected by a first spring 381, and the top of the seedling pushing arm 42 and the supporting sheet metal 43 are connected by a second spring 431. Both the first spring 381 and the second spring 431 are tension springs. When the cam 39 pushes the first roller 421 at the top of the seedling pushing arm 42, the seedling pushing arm 42 rotates on the cylindrical pin 432. Under the action of the lever, the lower end of the seedling pushing arm 42 drives the seedling pushing rod 44 to slide on the seedling picking needle 38 to the tip of the seedling picking needle 38, thus realizing the seedling pushing action.

[0042] Specifically, such as Figure 7 As shown, the first roller 421 rolls tightly against the arc-shaped outer contour 392 surface of the cam 39 under the force of the second spring 431. Section DA is the near rest stage of the cam 39, AB is the push stage of the cam 39, and the first roller 421 is pushed away from the axis of the cam 39. At this time, the seedling pushing arm 42 is pushed open and the seedling pushing rod 44 pushes the seedling. Section BC is the far rest stage and CD is the return stage. The first roller 421 moves towards the axis of the cam 39. At this time, the seedling pushing arm 42 and the seedling pushing rod 44 are retracted.

[0043] The movement of the cam 39, seedling pusher arm 42, and seedling pusher rod 44 in this invention is smooth and has a low failure rate, thus improving the production efficiency of vegetable transplanting. Compared with traditional single-row seedling picking mechanisms, it has higher seedling picking efficiency and can simultaneously pick up seedlings from four rows. By utilizing the advantages of high-efficiency seedling picking, it reduces labor and time costs in agricultural production and improves the survival rate of transplanted seedlings.

[0044] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A seedling-grabbing mechanism for a vegetable transplanter, characterized in that: Includes a frame, on which are mounted a drive unit, a motion conversion unit, a horizontal axis for the seedling picking arm, two seedling picking needles, and a seedling pushing arm; The seedling-picking arm is sleeved with a seedling-picking execution arm. The middle of the two seedling-picking needles is hinged to the seedling-picking execution arm. The upper ends of the two seedling-picking needles are connected by a first spring. A cam is provided between the two seedling-picking needles. The cam is fixed to the horizontal axis of the seedling-picking arm. Bosses are provided on both sides of one end of the cam. The bosses rotate and abut against the top of the two seedling-picking needles. The middle of the seedling-pushing arm is hinged to the seedling-picking execution arm. The top of the seedling-pushing arm and the seedling-picking execution arm are connected by a second spring, so that the top of the seedling-pushing arm fits against the other end of the cam. Two seedling-pushing rods are hung at the bottom of the seedling-pushing arm. The lower ends of the two seedling-pushing rods are respectively sleeved on the lower parts of the two seedling-picking needles. The motion conversion device is connected to the drive device and the horizontal axis of the seedling arm respectively, and is used to convert the output of the drive device into the rotation of the horizontal axis of the seedling arm and its back-and-forth movement along a preset track; the preset track includes a vertically extending arc segment and a straight segment connected to the lower end of the arc segment and extending obliquely downward. When the horizontal axis of the seedling-picking arm moves diagonally downward along the straight section, the seedling-picking needle changes from vertically downward to tilted forward. The cam's boss rotates with the horizontal axis of the seedling-picking arm and overcomes the spring force of the first spring, increasing the distance between the tops of the two seedling-picking needles, thereby reducing the distance between the lower parts of the two seedling-picking needles to perform the seedling-clamping action. When the horizontal axis of the seedling-picking arm moves from the straight section to the arc section, the two seedling-picking needles complete the seedling clamping and enter the seedling placement stage. When the horizontal axis of the seedling-picking arm moves upward from the bottom of the arc section to the top of the arc section, the seedling-picking needle changes from tilted downward to vertically downward. The cam's boss moves away from the two seedling-picking needles, the first spring resets, reducing the distance between the tops of the two seedling-picking needles, increasing the distance between the lower parts of the two seedling-picking needles to release the seedlings in the pot. At the same time, the other end of the cam pushes the seedling-pushing arm to rotate, causing the two seedling-pushing rods to slide on the seedling-picking needles to the lower end of the seedling-picking needles, thereby realizing the seedling-pushing action.

2. The seedling-collecting mechanism according to claim 1, characterized in that: The seedling-taking arm is fixedly connected to a supporting sheet metal. The two ends of the second spring are respectively connected to the top of the seedling-pushing arm and the supporting sheet metal. A cylindrical pin is provided on the supporting sheet metal. The cylindrical pin is located between the two seedling-taking needles. The middle part of the seedling-pushing arm is hinged to the cylindrical pin.

3. The seedling-collecting mechanism according to claim 1, characterized in that: The top of the seedling needle is equipped with a ball bolt, and the boss of the cam rotates to abut against the ball bolt.

4. The seedling-collecting mechanism according to claim 1, characterized in that: The top of the seedling pusher arm is equipped with a first roller, which is attached to the other end of the cam.

5. The seedling-collecting mechanism according to claim 4, characterized in that: The other end of the cam has an arc-shaped outer contour with a concave waist and a protruding bottom. This arc-shaped outer contour rolls on the first roller to cause the seedling pushing arm to drive the seedling pushing rod to perform the seedling pushing action.

6. The seedling-collecting mechanism according to claim 1, characterized in that: The motion conversion device includes a seedling-picking slide rail, which has a preset track with a J-shaped structure. The top of the seedling-picking execution arm is equipped with a second roller, and the lower part of the seedling-picking execution arm is sleeved on the horizontal axis of the seedling-picking arm. The second roller and the horizontal axis of the seedling-picking arm are respectively rotatably connected to the preset track.

7. The seedling-collecting mechanism according to claim 6, characterized in that: The motion conversion device also includes a gearbox, which contains a gearbox power input shaft, a gear mounting plate, planetary gears, a sun gear, and a gearbox power output shaft. The gearbox power input shaft is fixedly connected to the gear mounting plate, which has planetary gears that mesh with the sun gear. The planetary gears also have a gearbox power output shaft connected to the horizontal shaft of the seedling arm. A drive device is connected to the gearbox power input shaft to drive the gearbox power input shaft to rotate the gear mounting plate, which in turn drives the planetary gears to rotate and perform linear reciprocating motion.

8. The seedling-collecting mechanism according to claim 7, characterized in that: A support gear is also installed on the gear mounting spoke. The support gear and the planetary gear are respectively located at both ends of the gear mounting spoke. The support gear meshes with the sun gear.

9. The seedling-collecting mechanism according to claim 8, characterized in that: The ratio of the number of teeth between the planetary gear and the sun gear is 1:2, and the ratio of the number of teeth between the support gear and the sun gear is 1:

4.

10. The seedling-collecting mechanism according to claim 7, characterized in that: The drive unit includes a stepper motor, a drive sprocket, a chain, and a driven sprocket. The stepper motor drives the drive sprocket to rotate, and the drive sprocket drives the driven sprocket to rotate via the chain. The driven sprocket is connected to the power input shaft of the gearbox.

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