Seed metering device and legume seeder

Abstract

The application provides a seed metering device, which comprises a seed box and a seed metering wheel. The bottom of the seed box is provided with a discharge hole, and the seed metering wheel is arranged in the seed box. The seed metering wheel comprises a first wheel body, a second wheel body and a driving mechanism. The outer side wall of the first wheel body is provided with a plurality of first accommodating grooves. The second wheel body is non-rotatably buckled on the first wheel body. The outer side wall of the second wheel body is provided with a plurality of second accommodating grooves. The second accommodating grooves and the first accommodating grooves jointly form seed grooves with variable sizes. The seed metering device has the functions of seed metering and adjusting the size of the seed grooves. By switching the rotation direction of the driving mechanism, the size of the seed grooves can be adjusted, and different types and quantities of beans can be metered, thereby meeting different use requirements and improving the application range of the seed metering device. The application further provides a bean seeding machine comprising the seed metering device.

Description

Technical Field

[0001] This invention relates to the field of seeder technology, specifically to a seed metering device and a bean planter. Background Technology

[0002] A bean planter is an agricultural machine used for planting bean crops. Its main function is to efficiently plant bean seeds in the field while ensuring that the planting depth, spacing, and orientation of the seeds meet the specifications.

[0003] Currently available small-scale seeding machinery typically has a non-adjustable seed trough. This results in limitations such as the limited range of crops that can be sown, or the cumbersome process of changing the structure to accommodate other crops. Therefore, this paper proposes a seed metering device that allows for convenient adjustment of the seed trough size, accommodating different types and quantities of beans and meeting diverse usage needs. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide a seed metering device and a bean planter that can conveniently adjust the size of the seed trough to adapt to the seeding operation of different types and quantities of beans.

[0005] To achieve the above objectives, the present invention provides a seed metering device, including a seed box and a seed metering wheel. The bottom of the seed box is provided with a discharge hole, and the side wall of the seed box is provided with a clearance hole. The seed metering wheel is disposed inside the seed box, and a first channel is formed between the seed metering wheel and the inner wall of the seed box. The first channel communicates with the discharge hole.

[0006] The seed-discharging wheel includes: a first wheel body, the side of which faces away from the clearance hole abuts against the inner wall of the seed box, and the outer wall of the first wheel body is provided with a plurality of first receiving grooves; a second wheel body, which is fastened to the first wheel body without relative rotation, and the second wheel body is movably fitted into the clearance hole, and the outer wall of the second wheel body is provided with a plurality of second receiving grooves, the second receiving grooves and the first receiving grooves forming a seed groove of variable size; and a driving mechanism having a first rotation direction and a second rotation direction with opposite rotation directions;

[0007] When the drive mechanism rotates along the first direction of rotation, it drives the first wheel and the second wheel to rotate in one direction to discharge the seeds in the seed trough into the first channel; when the drive mechanism rotates along the second direction of rotation, it rotates relative to the first wheel and drives the second wheel to move relative to the first wheel to adjust the size of the seed trough.

[0008] Preferably, the driving mechanism includes: a rotating shaft coaxially passing through the first wheel and the second wheel, the rotating shaft not contacting the first wheel and the second wheel, the rotating shaft being rotatable along the first rotation direction or the second rotation direction; a unidirectional rotation drive assembly disposed within the first wheel and connected to the rotating shaft, the unidirectional rotation drive assembly being used to drive the first wheel to perform a unidirectional rotation action; a first end face cam coaxially disposed within the first wheel, the first end face cam being fixedly sleeved outside the rotating shaft; a second end face cam coaxially disposed within the second wheel, the second end face cam being capable of cooperating with the first end face cam; and a first elastic element for applying elastic force to the second wheel, so that the second wheel tends to move towards the first wheel.

[0009] Preferably, the end face of the first end face cam is provided with two first protrusions, and the two first protrusions are symmetrically arranged along the axis of the first end face cam; the end face of the second end face cam is provided with two second protrusions, and the two second protrusions are symmetrically arranged along the axis of the second end face cam, and the second protrusions can abut against the first protrusions.

[0010] Preferably, the first wheel body has a first groove, and the second wheel body has a second groove on the side facing the first groove; the unidirectional rotation drive assembly includes: a ratchet, fixedly sleeved outside the rotating shaft and located in the first groove, the ratchet being connected to the first end face cam; a pawl, rotatably disposed in the first groove, the pawl being capable of engaging with the ratchet, and a plurality of pawls being arranged in a circular array along the axis of the first wheel body; and a plurality of second elastic elements, each second elastic element corresponding to one pawl, the second elastic elements being used to apply an elastic force to the pawl to prevent it from disengaging from the ratchet.

[0011] Preferably, the first wheel body extends toward the end face of the second wheel body to form multiple extension blocks, and a first support portion is provided between two adjacent extension blocks, with the first receiving groove disposed in the first support portion; the second wheel body has an annular slot on the end face of the first wheel body, into which the extension blocks can extend; the side wall of the second wheel body has multiple notches communicating with the slot, with a second support portion disposed in the notches, and the second receiving groove disposed in the second support portion.

[0012] Preferably, the first support portion has a first inclined surface on the side away from the axis of the first wheel body, and the end of the first inclined surface near the second wheel body is inclined toward the axis of the first wheel body; the second support portion has a second inclined surface on the side facing the slot, and the second inclined surface cooperates with the first inclined surface; an elastic baffle is provided on the second inclined surface, and the elastic baffle abuts against the first inclined surface.

[0013] Preferably, a limiting sleeve is fixedly sleeved on the rotating shaft, the first elastic element is sleeved outside the rotating shaft, one end of the first elastic element abuts against the limiting sleeve, and the other end of the first elastic element extends into the relief hole and abuts against the end face of the second wheel body.

[0014] Preferably, the end face of the second wheel extends away from the first wheel to form an annular retaining ring, the outer diameter of the annular retaining ring is the same as the outer diameter of the second wheel, and the outer side wall of the annular retaining ring mates with the inner side wall of the clearance hole.

[0015] Preferably, the first channel is provided with a bristle-blocking brush that contacts the outer wall of the seed metering wheel; the seed box is provided with a hopper and a bristle-blocking block, the hopper being located above the seed metering wheel; a second channel is formed between the seed metering wheel and the inner wall of the seed box, the second channel and the first channel being respectively arranged on both sides of the seed metering wheel; the bristle-blocking block contacts the outer wall of the seed metering wheel, and the bristle-blocking block is used to prevent seeds entering the hopper from entering the second channel.

[0016] The present invention also provides a bean planter, including the above-mentioned seed metering device.

[0017] The beneficial effects of this invention are:

[0018] This invention discloses a seed metering device with both seed metering and seed trough size adjustment functions. By switching the rotation direction of the drive mechanism, when the drive mechanism rotates along the first rotation direction, driving the first and second wheels to rotate, seeds in the seed trough can be discharged through the first channel to the discharge hole, thus realizing the seed metering function. When the drive mechanism rotates along the second rotation direction, it can drive the second wheel to move closer to or further away from the first wheel. This changes the distance between the second and first receiving troughs, thereby conveniently adjusting the seed trough size. This allows for seed metering operations on different types and quantities of beans, meeting diverse usage needs and expanding the applicability of the seed metering device.

[0019] The present invention discloses a bean planter, which, by using the above-mentioned seed metering device, not only facilitates the seeding operation of beans, but also enables the seeding operation of different types and quantities of beans, thus meeting different usage needs and expanding the scope of application. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the structure of a seed metering device provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A structural schematic diagram from another perspective under the condition;

[0023] Figure 3 This is a schematic diagram of the seed box structure;

[0024] Figure 4 This is a schematic diagram of the internal structure of the seed box;

[0025] Figure 5 This is a schematic diagram of the seeding reel structure;

[0026] Figure 6 This is a schematic diagram of the structure of the ratchet and the first end face cam;

[0027] Figure 7 This is a schematic diagram of the ratchet engaging with the first wheel body;

[0028] Figure 8 for Figure 7 A partial schematic diagram at point A in the middle;

[0029] Figure 9 for Figure 7 Front view in the current state;

[0030] Figure 10 This is a schematic diagram of the structure of the second wheel body;

[0031] Figure 11 This is a cross-sectional schematic diagram of the seed trough;

[0032] Figure 12 A schematic cross-sectional view of the seed trough being enlarged;

[0033] Figure label:

[0034] 10. Seed box; 11. Discharge hole; 12. Clearance hole; 13. Material-blocking brush; 14. Material-blocking block; 20. First wheel body; 21. First receiving groove; 22. First groove; 23. Extension block; 24. First support part; 241. First inclined surface; 30. Second wheel body; 31. Second receiving groove; 32. Second groove; 33. Slot; 34. Second support part; 341. Second inclined surface; 35. Annular retaining ring; 41. First channel; 42. Seed groove; 43. Second channel; 50. Drive mechanism; 51. Rotating shaft; 52. First end face cam; 53. Second end face cam; 54. First elastic element; 55. Ratchet; 56. Pawl; 57. Limiting sleeve; 60. Elastic baffle. Detailed Implementation

[0035] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0036] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0037] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0038] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] Example 1

[0042] like Figure 1-12 As shown, in one embodiment of the present invention, a seed metering device is provided, including a seed box 10 and a seed metering wheel. The bottom of the seed box 10 is provided with a discharge hole 11, and the side wall of the seed box 10 is provided with a clearance hole 12. The seed metering wheel is disposed inside the seed box 10, and a first channel 41 is formed between the seed metering wheel and the inner wall of the seed box 10. The first channel 41 communicates with the discharge hole 11.

[0043] The seed metering reel includes a first wheel body 20, a second wheel body 30, and a drive mechanism 50. The first wheel body 20 abuts against the inner wall of the seed box 10 on the side opposite to the clearance hole 12. The outer wall of the first wheel body 20 is provided with multiple first receiving grooves 21. The second wheel body 30 is fastened to the first wheel body 20 without relative rotation and is movably fitted within the clearance hole 12. The outer wall of the second wheel body 30 is provided with multiple second receiving grooves 31. The second receiving grooves 31 and the first receiving grooves 21 together form a seed trough 42 of variable size. The drive mechanism 50 has a first rotation direction and a second rotation direction with opposite rotation directions.

[0044] During sowing, when the drive mechanism 50 rotates in the first direction, the drive mechanism 50 drives the first wheel 20 and the second wheel 30 to rotate in one direction, so as to discharge the seeds in the seed trough 42 to the first channel 41, and finally discharge them from the discharge hole 11.

[0045] When the size of the seed trough 42 needs to be adjusted, the drive mechanism 50 rotates along the second direction of rotation. The drive mechanism 50 rotates relative to the first wheel body 20, and the drive mechanism 50 drives the second wheel body 30 to move relative to the first wheel body 20 to adjust the size of the seed trough 42.

[0046] This embodiment discloses a seed metering device with both seed metering and seed trough size adjustment functions. By switching the rotation direction of the drive mechanism 50, when the drive mechanism 50 rotates along the first rotation direction, driving the first wheel 20 and the second wheel 30 to rotate, the seeds in the seed trough 42 can be discharged through the first channel 41 to the discharge hole 11, thereby realizing the seed metering function. When the drive mechanism 50 rotates along the second rotation direction, it can drive the second wheel 30 to move closer to or further away from the first wheel 20. In this way, the distance between the second receiving trough 31 and the first receiving trough 21 can be changed, thereby conveniently adjusting the size of the seed trough 42. This allows for seed metering operations on different types and quantities of beans, meeting different usage needs and expanding the applicability of the seed metering device.

[0047] In one embodiment, the drive mechanism 50 includes a rotating shaft 51, a unidirectional rotation drive assembly, a first end face cam 52, a second end face cam 53, and a first elastic element 54. The rotating shaft 51 is coaxially mounted on the first wheel body 20 and the second wheel body 30, and the rotating shaft 51 does not contact the first wheel body 20 and the second wheel body 30. The rotating shaft 51 can rotate in a first rotation direction or a second rotation direction, and both ends of the rotating shaft 51 extend out of the seed box 10. Of course, the drive mechanism 50 also includes a power source for driving the rotating shaft 51 to rotate, which is not shown in the figure.

[0048] A unidirectional rotation drive assembly is disposed within the first wheel body 20 and connected to the rotating shaft 51. This assembly drives the first wheel body 20 to rotate in one direction. A first end face cam 52 is coaxially disposed within the first wheel body 20 and is fixedly sleeved on the outside of the rotating shaft 51. A second end face cam 53 is coaxially disposed within the second wheel body 30 and can cooperate with the first end face cam 52. A first elastic element 54 applies a spring force to the second wheel body 30, causing it to tend to move towards the first wheel body 20.

[0049] The end face of the first end face cam 52 is provided with two first protrusions, which are symmetrically arranged along the axis of the first end face cam 52; the end face of the second end face cam 53 is provided with two second protrusions, which are symmetrically arranged along the axis of the second end face cam 53, and the second protrusions can abut against the first protrusions.

[0050] When the rotating shaft 51 rotates along the first rotation direction, the rotating shaft 51 drives the unidirectional rotation drive component to cooperate with the first wheel body 20, thereby driving the first wheel body 20 and the second wheel body 30 to rotate along the first rotation direction as well. Since the first end face cam 52 will rotate synchronously with the rotating shaft 51 along the first rotation direction, and the second end face cam 53 will also rotate synchronously with the second wheel body 30 along the first rotation direction, the first end face cam 52 will not cooperate with the second end face cam 53. In this way, the seeding device can be switched to the seeding function.

[0051] When the shaft 51 rotates along the second direction of rotation, the unidirectional rotation drive assembly will not cooperate with the first wheel 20, thus failing to drive the first wheel 20 and the second wheel 30 to rotate. At this time, the first wheel 20 and the second wheel 30 will not rotate. Since the first end face cam 52 rotates synchronously with the shaft 51 along the first direction of rotation, and the second end face cam 53 is stationary, the first end face cam 52 will intermittently push against the second end face cam 53. During the pushing process, the second wheel 30 will move away from the first wheel 20, thereby enlarging the seed groove 42.

[0052] When the first protrusion of the first end face cam 52 abuts against the second protrusion of the second end face cam 53, the size of the seed groove 42 is at its maximum. As the second wheel body 30 moves away from the first wheel body 20, the first elastic member 54 continuously applies elastic force to the second wheel body 30. As the first protrusion gradually moves to the position between the two second protrusions, the first elastic member 54 gradually moves against the second wheel body 30 towards the first wheel body 20, thereby gradually reducing the size of the seed groove 42.

[0053] Furthermore, the first wheel body 20 is provided with a first groove 22, and the second wheel body 30 is provided with a second groove 32 on the side facing the first groove 22. The unidirectional rotation drive assembly includes a ratchet 55, a pawl 56, and multiple second elastic elements. The ratchet 55 is fixedly sleeved outside the rotating shaft 51 and located inside the first groove 22. The ratchet 55 is connected to the first end face cam 52. The pawl 56 is rotatably disposed inside the first groove 22 and can engage with the ratchet 55. Multiple pawls 56 are arranged in a circular array along the axis of the first wheel body 20. Each second elastic element corresponds to one pawl 56, and the second elastic element is used to apply a spring force to the pawl 56 to prevent it from disengaging from the ratchet 55.

[0054] When the rotating shaft 51 rotates in the first direction of rotation, the rotating shaft 51 drives the ratchet 55 to rotate synchronously. When the ratchet teeth of the ratchet 55 engage with the pawl 56, the ratchet 55 will drive the first wheel body 20 to rotate in the first direction of rotation, thereby causing the first wheel body 20 to drive the second wheel body 30 to rotate synchronously. In this way, the seeding device can be switched to the seeding function.

[0055] When the shaft 51 rotates in the second direction of rotation, it drives the ratchet 55 to rotate synchronously. The ratchet teeth of the ratchet 55 cannot engage with the pawl 56, therefore the ratchet 55 cannot drive the first wheel 20 to rotate, and consequently, the second wheel 30 will not rotate either. Since the first end face cam 52 rotates synchronously with the shaft 51 and the ratchet 55 in the first direction of rotation, and the second end face cam 53 is stationary, the first end face cam 52 will intermittently push against the second end face cam 53. During this pushing process, the second wheel 30 will move away from the first wheel 20, thereby enlarging the seed groove 42.

[0056] In one embodiment, the first wheel body 20 extends towards the end face of the second wheel body 30, forming multiple extension blocks 23. A first support portion 24 is provided between two adjacent extension blocks 23, and a first receiving groove 21 is disposed within the first support portion 24. The end face of the second wheel body 30 facing the first wheel body 20 has a slot 33 with an annular structure. The extension blocks 23 can extend into the slot 33. The side wall of the second wheel body 30 has multiple notches communicating with the slot 33. A second support portion 34 is provided within the notches, and a second receiving groove 31 is disposed within the second support portion 34. With the cooperation of the extension blocks 23 and the slot 33, as the second wheel body 30 moves away from the first wheel body 20, the extension blocks 23 can block the gap between the first wheel body 20 and the second wheel body 30, thereby preventing seeds from falling into the inner cavities of the first wheel body 20 and the second wheel body 30.

[0057] Furthermore, a groove is formed on the side of the first support 24 opposite to the axis of the first wheel body 20. The groove has a first inclined surface 241, and the end of the first inclined surface 241 near the second wheel body 30 is inclined towards the axis of the first wheel body 20. The second support 34 cooperates with the groove, and a second inclined surface 341 is provided on the side of the second support 34 facing the slot 33. The second inclined surface 341 cooperates with the first inclined surface 241. An elastic baffle 60 is provided on the second inclined surface 341, and the elastic baffle 60 abuts against the first inclined surface 241. By designing the first inclined surface 241 and the second inclined surface 341 to cooperate, the depth of the seeding groove 42 can be increased during the adjustment of the size of the seeding groove 42, thereby accommodating different types of beans. At the same time, the elastic baffle 60 prevents small impurities in the seeding groove 42 from falling into the inner cavity of the first wheel body 20 and the second wheel body 30.

[0058] In one embodiment, a limiting sleeve 57 is fixedly sleeved on the rotating shaft 51, and a first elastic member 54 is sleeved outside the rotating shaft 51. One end of the first elastic member 54 abuts against the limiting sleeve 57, and the other end of the first elastic member 54 extends into the relief hole 12 and abuts against the end face of the second wheel body 30.

[0059] In one embodiment, an annular retaining ring 35 extends from the end face of the second wheel body 30 away from the first wheel body 20. The outer diameter of the annular retaining ring 35 is the same as the outer diameter of the second wheel body 30, and the outer sidewall of the annular retaining ring 35 mates with the inner sidewall of the clearance hole 12. By designing the annular retaining ring 35 on the second wheel body 30, the second wheel body 30 can always block the clearance hole 12 during the movement of the second wheel body 30, preventing seeds in the seed box 10 from leaking out of the clearance hole 12.

[0060] In one embodiment, a baffle brush 13 is provided in the first channel 41, and the baffle brush 13 contacts the outer wall of the seed metering wheel. The seed box 10 is provided with a hopper and a baffle block 14, with the hopper located above the seed metering wheel. A second channel 43 is formed between the seed metering wheel and the inner wall of the seed box 10, and the second channel 43 and the first channel 41 are respectively arranged on both sides of the seed metering wheel. The baffle block 14 contacts the outer wall of the seed metering wheel and is used to prevent seeds entering the hopper from entering the second channel 43. During the rotation of the seed metering wheel in the first direction of rotation, the baffle brush 13 will block the seeds, allowing only the seeds in the seed trough 42 to enter the first channel 41, thereby evenly conveying the seeds to the discharge hole 11.

[0061] Example 2

[0062] In another embodiment of the present invention, a bean planter is provided, including the seed metering device in the first embodiment above. By using the seed metering device, it is not only convenient to realize the seed metering operation of beans, but also to realize the seed metering operation of different types and quantities of beans, thereby meeting different usage needs and expanding the scope of application.

[0063] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A seed metering device, characterized in that, Includes a seed box (10) and a seed metering wheel. The seed box (10) has a discharge hole (11) at the bottom and a clearance hole (12) on the side wall of the seed box (10). The seed metering wheel is located inside the seed box (10), and a first channel (41) is formed between the seed metering wheel and the inner wall of the seed box (10). The first channel (41) communicates with the discharge hole (11). The seeding wheel includes: The first wheel body (20) abuts against the inner wall of the seed box (10) on the side away from the relief hole (12), and the outer wall of the first wheel body (20) is provided with a plurality of first receiving grooves (21). The second wheel (30) is fastened to the first wheel (20) without relative rotation. The second wheel (30) is movably fitted within the clearance hole (12). The outer wall of the second wheel (30) is provided with a plurality of second receiving grooves (31). The second receiving grooves (31) and the first receiving grooves (21) together form a seeding groove (42) of variable size. The drive mechanism (50) has a first rotation direction and a second rotation direction with opposite rotation directions; When the drive mechanism (50) rotates along the first direction of rotation, the drive mechanism (50) drives the first wheel (20) and the second wheel (30) to rotate in one direction, so as to discharge the seeds in the seed trough (42) to the first channel (41). When the drive mechanism (50) rotates along the second direction of rotation, the drive mechanism (50) rotates relative to the first wheel (20), and the drive mechanism (50) drives the second wheel (30) to move relative to the first wheel (20) to adjust the size of the seed groove (42); The drive mechanism (50) includes: A rotating shaft (51) is coaxially mounted on the first wheel body (20) and the second wheel body (30). The rotating shaft (51) is not in contact with the first wheel body (20) and the second wheel body (30). The rotating shaft (51) can rotate along the first rotation direction or the second rotation direction. A one-way rotation drive assembly is disposed inside the first wheel body (20) and connected to the rotating shaft (51). The one-way rotation drive assembly is used to drive the first wheel body (20) to perform a one-way rotation action. The first end face cam (52) is coaxially disposed inside the first wheel body (20), and the first end face cam (52) is fixedly sleeved outside the rotating shaft (51); The second end face cam (53) is coaxially disposed within the second wheel body (30), and the second end face cam (53) can cooperate with the first end face cam (52); and A first elastic element (54) is used to apply elastic force to the second wheel (30) so that the second wheel (30) tends to move toward the first wheel (20).

2. The seed metering device according to claim 1, characterized in that, The end face of the first end face cam (52) is provided with two first protrusions, and the two first protrusions are symmetrically arranged along the axis of the first end face cam (52); the end face of the second end face cam (53) is provided with two second protrusions, and the two second protrusions are symmetrically arranged along the axis of the second end face cam (53), and the second protrusions can abut against the first protrusions.

3. The seed metering device according to claim 1, characterized in that, The first wheel body (20) is provided with a first groove (22), and the second wheel body (30) is provided with a second groove (32) on the side facing the first groove (22); The unidirectional rotation drive assembly includes: A ratchet (55) is fixedly sleeved outside the rotating shaft (51) and located in the first groove (22). The ratchet (55) is connected to the first end face cam (52). Pawl (56) is rotatably disposed in the first groove (22). The pawl (56) can engage with the ratchet (55). Multiple pawls (56) are arranged in a ring array along the axis of the first wheel body (20). Multiple second elastic elements, each corresponding to one of the pawls (56), the second elastic elements being used to apply an elastic force to the pawls (56) to prevent them from disengaging from the ratchet (55).

4. The seed metering device according to claim 1, characterized in that, The first wheel body (20) extends toward the end face of the second wheel body (30) to form multiple extension blocks (23), and a first support part (24) is provided between two adjacent extension blocks (23), and the first receiving groove (21) is provided in the first support part (24); The second wheel body (30) has a slot (33) with an annular structure on the end face facing the first wheel body (20). The extension block (23) can be inserted into the slot (33). The side wall of the second wheel body (30) has multiple notches that communicate with the slot (33). A second support part (34) is provided in the notch. The second receiving groove (31) is provided in the second support part (34).

5. The seed metering device according to claim 4, characterized in that, The first support part (24) has a first inclined surface (241) on the side away from the axis of the first wheel body (20), and the end of the first inclined surface (241) near the second wheel body (30) is inclined toward the axis of the first wheel body (20); the second support part (34) has a second inclined surface (341) on the side facing the slot (33), and the second inclined surface (341) cooperates with the first inclined surface (241); The second inclined surface (341) is provided with an elastic baffle (60), which abuts against the first inclined surface (241).

6. The seed metering device according to claim 3, characterized in that, A limiting sleeve (57) is fixedly sleeved on the rotating shaft (51). The first elastic element (54) is sleeved outside the rotating shaft (51). One end of the first elastic element (54) abuts against the limiting sleeve (57), and the other end of the first elastic element (54) extends into the relief hole (12) and abuts against the end face of the second wheel body (30).

7. The seed metering device according to claim 1, characterized in that, The end face of the second wheel body (30) extends away from the first wheel body (20) to form an annular retaining ring (35). The outer diameter of the annular retaining ring (35) is the same as the outer diameter of the second wheel body (30). The outer side wall of the annular retaining ring (35) cooperates with the inner side wall of the clearance hole (12).

8. The seed metering device according to claim 1, characterized in that, The first channel (41) is provided with a material-blocking brush (13), which is in contact with the outer wall of the seed metering wheel; The seed box (10) is provided with a hopper and a baffle block (14). The hopper is located above the seed metering wheel. A second channel (43) is formed between the seed metering wheel and the inner wall of the seed box (10). The second channel (43) and the first channel (41) are respectively arranged on both sides of the seed metering wheel. The baffle block (14) is in contact with the outer wall of the seed metering wheel, and the baffle block (14) is used to block the seeds entering the hopper from entering the second channel (43).

9. A bean planter, characterized in that, The seeding device includes any one of claims 1-8.

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