Seeder with secondary seeding function

Abstract

The present invention provides a seeding device with a secondary seeding function, which includes a seeding mechanism and a seeding guide part. The seeding mechanism includes a seeding device housing with a cavity formed inside, a seeding wheel pivotally provided in the cavity, a seed cleaning brush fitted on the outer circumference of the seeding wheel, the seeding wheel and the seed cleaning brush separate the cavity into an upper cavity and a lower cavity, and a plurality of holes for accommodating seeds are constructed on the outer circumference of the seeding wheel. The seeds in the upper cavity rotate with the seeding wheel and are scraped by the seed cleaning brush, so that only the seeds accommodated in the holes fall into the seed groove. The seeding guide part is arranged below the seeding device housing, and a seed blocking plate that can be opened and closed by the rotation drive of the seeding wheel is pivotally provided at the bottom end of the seeding guide part, so that after the seeds fall above the seed blocking plate, the seed blocking plate is intermittently opened to form a secondary seeding of the seeds. The seeding device with a secondary seeding function of the present invention can improve the accuracy of seeds falling into the seed groove, thereby ensuring the consistency of the adjacent plant spacing.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery, and in particular to a seed metering device with a secondary seeding function. Background Art

[0002] Peanut is one of the important economic crops in my country, with a large planting area. With the adjustment of planting structure and the promotion of new technologies, the mechanization of peanut planting is becoming more and more advanced. However, the traditional peanut hole sowing and metering device has a certain speed after the seeds leave the sowing device, and the collision with the wall of the seed delivery tube can easily cause the seeds to splash everywhere and fail to fall accurately into the seed hole, resulting in uneven plant spacing and poor hole formation when sowing multiple seeds in one hole.

[0003] In addition, the existing seed meter can only sow seeds of a certain size. When the sowing accuracy is poor, it is easy to miss seeds or have empty holes. Moreover, for seeds of uneven size, the number of seeds sown is uneven, which also wastes seeds. Therefore, it is urgent to have a seed meter with adjustable hole size. Summary of the invention

[0004] In view of this, the present invention aims to provide a seed meter with a secondary seeding function, so as to increase the accuracy of seeds falling into the seed furrow and improve the consistency of adjacent plant spacing.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A seed metering device with a secondary seeding function, comprising:

[0007] A seeding mechanism is connected to the bottom of the seed box, the seeding mechanism includes a seeding device shell, a cavity is constructed in the seeding device shell, a seeding wheel is pivotally arranged in the cavity along a direction perpendicular to the through-through direction, a seed cleaning brush is closely arranged on the outer circumference of the seeding wheel, the seeding wheel and the seed cleaning brush divide the cavity into an upper cavity connected to the seed box and a lower cavity connected to the seed groove; a plurality of holes for accommodating seeds are constructed on the outer circumference of the seeding wheel, the seeds in the upper cavity are rotated by the seeding wheel and scraped by the seed cleaning brush, and the seeds only accommodated in the holes are transferred from the upper cavity to the lower cavity and fall into the seed groove;

[0008] The seed guide part is arranged below the shell of the seed metering device, and the seed guide part is constructed to allow the seeds to fall into the seed guide groove in the seed groove through the lower cavity. A seed blocking plate is pivotally provided at the bottom end of the seed guide groove. The seed blocking plate can be opened and closed by the rotation drive of the seed metering wheel, so that after the seeds fall above the seed blocking plate, the seeds can be planted for the second time due to the intermittent opening of the seed blocking plate.

[0009] Furthermore, the seed-dispensing wheel includes a first wheel body and a second wheel body arranged coaxially, and a plurality of cavities of different lengths are constructed on the outer peripheral surface of the first wheel body, which are circumferentially arranged around the first wheel body and alternately distributed. Each of the cavities is extended along the axial direction of the first wheel body, and corresponding to each of the cavities, a plurality of convex columns of different lengths are alternately distributed on the outer peripheral surface of the second wheel body, so that each of the convex columns is placed in the corresponding cavity to form a hole for accommodating seeds.

[0010] Furthermore, mounting holes are formed on the first wheel body and the second wheel body, which are arranged to pass through the axial direction of the seeding wheel and can allow the seeding wheel to be pivotally mounted on the seeding device housing, and an adjusting shaft is passed through the mounting hole of the second wheel body. The adjusting shaft is limited and fixed between the first wheel body and the second wheel body, and an elastic pushing piece that can elastically press against the first wheel body and the second wheel body is mounted on the adjusting shaft, and an adjusting nut is screwed on one end of the adjusting shaft located on the outside of the second wheel body, so that the size of the hole can be adjusted by screwing the adjusting nut in or out.

[0011] Furthermore, a guide limiting protrusion is formed in the mounting hole, and a guide groove is formed on the adjusting shaft corresponding to the guide limiting protrusion.

[0012] Furthermore, the adjustment shaft has a limit plate abutting against the first wheel body, and a shaft neck section connected to one side of the limit plate, the end of the shaft neck section constitutes the overhanging section, and a pivot hole with a regular polygonal cross-section is formed at the axis of the adjustment shaft.

[0013] Furthermore, a transmission assembly constituting the opening and closing arrangement of the seed blocking plate is provided between the seed blocking plate and the seed wheel.

[0014] Furthermore, the transmission assembly includes a transmission pull rod connected to the seed baffle, a limit baffle connected to the transmission pull rod and rotatable relative to the seed meter housing, and an elastic return member arranged between the limit baffle and the seed meter housing, the limit baffle abuts against the outer peripheral surface of the seed wheel to receive the rotation of the seed wheel and disengage from and rotate with the outer peripheral surface of the seed wheel, and can maintain abutment with the outer peripheral surface of the seed wheel due to the elastic force of the elastic return member.

[0015] Furthermore, a plurality of stoppers protruding radially outwardly from the seeding wheel are evenly distributed in an array on the outer circumferential surface of one end of the seeding wheel, and one side of the position limiting baffle abuts against the stoppers.

[0016] Furthermore, corresponding to the limit baffle, a limit column is constructed on the seed metering device housing to enable the limit baffle to rotate within a certain angle.

[0017] Furthermore, a driving mechanism component capable of driving the seeding wheel and the seed cleaning brush to rotate synchronously is provided on the seeding device housing.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The seeding device with secondary seeding function described in the present invention realizes the adjustment of the seeding amount by arranging a seeding wheel with adjustable hole size in the seeding device housing, that is, the holes that can accommodate seeds are formed by the insertion and cooperation of cavities of different lengths and convex columns on the first wheel body and the second wheel body, and the arranged adjustment shaft and the adjustment nut screwed on the end of the adjustment shaft, and the elastic pushing member sleeved on the adjustment shaft and elastically pressed against the first wheel body and the second wheel body, so that the size of the hole can be adjusted when the adjustment nut screwed on the adjustment shaft is screwed in or out, thereby realizing the adjustment of the seeding amount.

[0020] In addition, by providing a seed guide groove and a seed baffle plate pivotally arranged at the bottom of the seed guide groove, after the seeds fall above the seed baffle plate, the seed baffle plate is driven by the rotation of the seed wheel to open intermittently, so that the seeds can be sown a second time, thereby improving the accuracy of the seeds falling into the seed groove and ensuring the consistency of the adjacent plant spacing, that is, it can improve the qualified index of sowing, reduce the reseeding rate and the missed sowing rate, and thus have a better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a structural schematic diagram of a seed meter with a secondary seeding function according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the structure from another angle;

[0024] Figure 3 It is a structural schematic diagram of a shell of a seed metering device equipped with a seed metering wheel according to an embodiment of the present invention;

[0025] Figure 4 An exploded view of the seeding wheel according to an embodiment of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the first wheel body according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic structural diagram of the second wheel body according to an embodiment of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the assembly of the driving shaft and the second wheel body according to an embodiment of the present invention;

[0029] Figure 8 It is a schematic structural diagram of the adjustment shaft according to an embodiment of the present invention;

[0030] Description of reference numerals:

[0031] 1-mounting seat, 2-seeder housing, 3-driving shaft, 4-driven shaft, 5-first wheel body, 6-second wheel body, 7-adjusting nut, 8-seed cleaning brush, 9-seed guide groove, 10-hole;

[0032] 11-ditching device mounting hole, 12-frame connecting hole, 34-chain, 341-sprocket, 51-long cavity, 52-short cavity, 53-guide limiting protrusion, 61-long boss, 62-short boss, 63-block;

[0033] 21-limit baffle, 22-elastic return member, 23-seed baffle, 24-transmission rod, 25-limit column, 91-auxiliary baffle;

[0034] 31-adjusting shaft, 311-limiting plate, 312-shaft neck section, 313-pivot hole, 314-guide groove, 32-elastic push piece. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0038] The present embodiment relates to a seeding device with a secondary seeding function, whose main structure includes a seeding mechanism and a seed guide part connected to the bottom of the seed box, wherein the seeding mechanism includes a device shell, a cavity arranged through is constructed in the seeding device shell, a seeding wheel is pivotally provided in the cavity along a direction orthogonal to the through-through direction, a seed cleaning brush is closely arranged on the outer peripheral surface of the seeding wheel, the seeding wheel and the seed cleaning brush divide the cavity into an upper cavity connected to the seed box and a lower cavity connected to the seed groove, and a plurality of holes for accommodating seeds are constructed on the outer peripheral surface of the seeding wheel. The seeds in the upper cavity are transferred from the upper cavity to the lower cavity and fall into the seed groove as the seeding wheel rotates and is scraped by the seed cleaning brush, so that the excess seeds are scraped off by the seed cleaning brush before the sowing position, thereby ensuring that no excess seeds fall from the seeding device.

[0039] The seed guide part is arranged below the shell of the seed metering device, and the seed guide part is constructed to allow the seeds to fall into the seed guide groove in the seed groove through the lower cavity. A seed blocking plate is pivotally provided at the bottom end of the seed guide groove. The seed blocking plate can be opened and closed by the rotation drive of the seed metering wheel, so that after the seeds fall above the seed blocking plate, the seeds can be planted for the second time due to the intermittent opening of the seed blocking plate.

[0040] Based on the above overall design concept, the seed meter with secondary seeding in this embodiment is arranged below the seed box and at the rear side of the furrow opener. An exemplary structure thereof is as follows: Figure 1 and Figure 2 As shown, its main structure includes a mounting seat 1, a seed meter housing 2 disposed above the mounting seat 1, and a seed guide groove 9 connected to the bottom of the mounting seat 1. The seed meter housing 2 and the seed guide groove 9 can be connected to the mounting seat 1 by screwing or welding. In addition, a through hole is formed on the mounting seat 1 for the seeds in the seed box to fall into the seed groove. The through hole is connected to the aforementioned lower cavity and is also connected to the seed guide groove 9. Figure 1 , Figure 2 Combination Figure 3 As described above, the mounting base 1 is also provided with a furrow opener mounting hole 11 and a frame connecting hole 12, so as to facilitate the connection of the mounting base 1 with the furrow opener and the frame of the seeder.

[0041] It should be noted here that the aforementioned holes 10 can be evenly distributed circumferentially along the outer circumferential surface of the seed wheel, or they can be unevenly distributed, and the number of the holes 10 is not limited. In the present embodiment, they are preferably evenly distributed circumferentially. At the same time, the size of the holes 10 can be set to a certain value, or it can be set to be adjustable. In the present embodiment, it is preferred that the size of the holes 10 is adjustable.

[0042] In order to adjust the size of the hole 10, the seed wheel of this embodiment includes a first wheel body 5 and a second wheel body 6 which are coaxially arranged. A plurality of cavities of different lengths are arranged along the circumference of the first wheel body 5 and are alternately distributed. Each cavity is extended along the axial direction of the first wheel body 5. Corresponding to each cavity, a plurality of convex columns of different lengths which are alternately distributed are formed on the outer circumference of the second wheel body 6. Corresponding convex columns are placed in corresponding cavities to form holes 10 for accommodating seeds. That is, the size of the hole 10 can be adjusted by adjusting the insertion length of the second wheel body 6 relative to the first wheel body 5.

[0043] In terms of specific structure, Figure 4 Combination Figure 5 , Figure 6 As shown, a plurality of long cavities 51 and short cavities 52 are arranged circumferentially around the first wheel body 5 and are alternately spaced and distributed on the outer circumferential surface of the first wheel body 5. The long cavities 51 and the short cavities 52 are both extended along the axial direction of the first wheel body 5, and the ends of the long cavities 51 and the short cavities 52 are both concave spherical. A plurality of long protrusions 61 and a plurality of short protrusions 62 are correspondingly formed on the outer circumferential surface of the second wheel body 6, and the ends of each long protrusion 61 and the short protrusion 62 are both concave spherical, so that the long protrusions 61 and the short protrusions 62 are correspondingly placed in the short cavities 52 and the long cavities 51 to form a hole 10 for accommodating seeds. That is, the hole 10 in this embodiment is formed by the first wheel body 5 and the second wheel body 6 after the first wheel body 5 and the second wheel body 6 are inserted and arranged in two rows at intervals on the circumferential direction of the first wheel body 5 and the second wheel body 6.

[0044] It should be noted that the number of rows of the holes 10 may be other numbers besides the two rows described in the above structure, such as one row, three rows, four rows or other multiple rows, which differ only in the difficulty of processing the first wheel body 5 and the second wheel body 6. Based on the comprehensive consideration of the sowing efficiency and the difficulty of processing the first wheel body 5 and the second wheel body 6, the number of holes 10 formed in this embodiment is preferably two rows.

[0045] In this embodiment, a partition plate is constructed on the seeding device housing 2 corresponding to the two rows of holes 10 on the seeding wheel to form different seeding slots. Of course, a baffle plate can be added above the partition plate to prevent the seeds in the seed box from falling into the seeding slot, so that the sowing of a single row of holes 10 can be achieved, thereby increasing the sowing spacing. Of course, the two rows of holes 10 provided in this embodiment can not only increase the sowing spacing, but also can be alternately matched with the two seed baffles 23 in the seed guide slot 9 described below, that is, the seed baffles 23 in the seed guide slot 9 can be opened and closed by the rotation of the seeding wheel, so that after the seeds fall above the seed baffles 23, the rotation of the seeding wheel causes the two seed baffles 23 to be intermittently opened to achieve secondary seeding of the seeds.

[0046] It should be noted that the cross section of the seed guide groove 9 in this embodiment is "U" shaped. Figure 1 and Figure 2 As shown, a partition is provided in the middle of the seed guide groove 9 to form two channels corresponding to the two rows of holes 10. Since the seeds have a certain speed in the process of falling into the seed groove through the through hole and collide with the side wall of the seed guide groove 9 to a certain extent, in order to make the seeds slowly fall into the seed blocking plate 23 during the falling process, an auxiliary baffle 91 is constructed on the seed guide groove 9 to reduce the speed of the seeds during the falling process and prevent the seeds from splashing everywhere, so that the seeds can accurately fall above the seed blocking plate 23 to improve the sowing accuracy.

[0047] In this embodiment, in order to realize the intermittent opening and closing of the seed retaining plate 23, continue to refer to Figure 1 and Figure 2 As shown in the figure, a transmission assembly constituting the intermittent opening and closing arrangement of the seed blocking plate 23 is provided between the seed blocking plate 23 and the seeding wheel. Of course, the intermittent opening and closing of the seed blocking plate 23 can also be achieved by the cooperation of the driving mechanism and the transmission assembly in the prior art, for example, by driving by a servo motor, and making the opening and closing of the seed blocking plate 23 match the rotation of the seeding wheel, the intermittent opening and closing of the seed blocking plate 23 can also be achieved, that is, the secondary seeding of seeds can be achieved.

[0048] In this embodiment, the transmission assembly includes a transmission rod 24 connected to the seed blocking plate 23, a limit baffle 21 connected to the transmission rod 24 and rotatable relative to the seed meter housing 2, and an elastic return member 22 provided between the limit baffle 21 and the seed meter housing 2. The limit baffle 21 abuts against the outer peripheral surface of the seed wheel so as to receive the rotation of the seed wheel and disengage from and rotate with the outer peripheral surface of the seed wheel, and can maintain abutment with the outer peripheral surface of the seed wheel due to the elastic force of the elastic return member 22.

[0049] In terms of specific structure, a plurality of blocks 63 are evenly arranged in an array along the radial direction of the seeding wheel, that is, protruding radially outward from the second wheel body 6, on the outer circumference of one end of the seeding wheel, that is, on the outer circumference of one end of the second wheel body 6, and one side of the above-mentioned limit baffle 21 abuts against the block 63. At the same time, corresponding to the limit baffle 21, a limit column 25 is constructed on the seeding device housing 2 to further enable the limit baffle 21 to rotate within a certain angle.

[0050] Of course, the number of transmission components is set to match the number of rows of the holes 10. In this embodiment, two rows of holes 10 are used as an example for detailed description. The aforementioned seed blocking plates 23 are two pivotally arranged at the bottom of the seed guide groove 9, and the transmission pull rod 24 connecting the seed blocking plates 23 is also set to two to match the number of the seed blocking plates 23. One end of the transmission pull rod 24 is connected to the seed blocking plate 23, and the other end is fixedly connected to the limit baffle 21 that can be rotatably arranged relative to the seed meter housing 2, and the rotation of the limit baffle 21 drives the movement of the transmission pull rod 24.

[0051] Among them, the elastic return member 22 provided between the limit baffle 21 and the seeding device housing 2 enables the limit baffle 21 to remain in contact with the limit column 25 or the block 63 on the outer peripheral surface of the seeding wheel. Through the rotation of the seeding wheel, the limit baffle 21 abutting on the outer peripheral surface of the seeding wheel, or the limit plate 311 abutting on the limit column 25 is disengaged and rotated, thereby driving the transmission pull rod 24 to move, so that the seed blocking plate 23 is opened, and then the seeds are planted twice. Under the elastic force of the elastic return member 22, the limit baffle 21 is again abutted against the outer wall of the seeding wheel or the limit column 25, so that the seed blocking plate 23 is closed to receive the seeds dropped by the rotation of the seeding wheel. That is, the opening and closing of the seed blocking plate 23 is achieved by repeatedly abutting and disengaging the limit baffle 21. The elastic return member 22 in this embodiment is preferably a spring.

[0052] In order to realize the pivoting of the seeding wheel on the seeding device housing 2, that is, to realize the pivoting of the first wheel body 5 and the second wheel body 6 on the seeding device housing 2, mounting holes are formed on the first wheel body 5 and the second wheel body 6 along their respective axial directions and for the seeding wheel to be pivoted on the seeding device housing 2. In order to adjust the insertion length of the second wheel body 6 relative to the first wheel body 5, an adjustment shaft 31 is passed through the mounting hole of the second wheel body 6, and the adjustment shaft 31 is limitedly fixed between the first wheel body 5 and the second wheel body 6, and an elastic push piece 32 that can elastically press against the first wheel body 5 and the second wheel body 6 is mounted on the adjustment shaft 31, and an adjustment nut 7 is screwed on one end of the adjustment shaft 31 located outside the second wheel body 6, and the size of the hole 10 can be adjusted by screwing the adjustment nut 7 on the adjustment shaft 31.

[0053] In addition, in order to realize synchronous rotation of the seeding wheel and the adjustment shaft 31 described below, in this embodiment, a guide limit protrusion 53 is formed in the mounting hole of the first wheel body 5, and a guide groove 314 is formed on the adjustment shaft 31 corresponding to the guide limit protrusion 53. The cooperation between the guide limit protrusion 53 and the guide groove 314 can prevent the relative rotation between the seeding wheel and the adjustment shaft 31, so that the seeding wheel and the adjustment shaft 31 rotate synchronously.

[0054] Depend on Figure 4 Combination Figure 7 and Figure 8 As shown, the adjustment shaft 31 of this embodiment is fixed between the first wheel body 5 and the second wheel body 6, and has an extended section that passes through the mounting hole of the second wheel body 6 and is exposed to the outside, and an adjustment nut 7 is screwed on the extended section. Figure 7 As shown, the adjusting shaft 31 has a stop plate 311 that can abut against the first wheel body 5, and a shaft diameter section connected to one side of the stop plate 311, the end of the shaft diameter section constitutes an extension section, and a thread is constructed on the extension section to facilitate the screw connection of the adjusting nut 7. In addition, a pivot hole 313 with a regular polygonal cross-section is formed at the axis of the adjusting shaft 31. In this embodiment, the pivot hole 313 is preferably a regular hexagon, so as to facilitate the plug-in connection with the driving shaft 3 with a regular hexagonal cross-section shape described below, thereby realizing the synchronous rotation of the adjusting shaft 31 and the driving shaft 3.

[0055] The elastic push member 32 of this embodiment is sleeved on the adjustment shaft 31 and elastically pressed against the first wheel body 5 and the second wheel body 6. Figure 4 and Figure 8 As shown, one end of the elastic push member 32 abuts against the limit plate 311 on the adjustment shaft 31, and the other end abuts against the second wheel body 6, and the size of the hole 10 can be adjusted by screwing the adjustment nut 7 in or out of the adjustment shaft 31. In this embodiment, in view of the advantages of the spring having good elastic force, wide application, and convenient material, the elastic push member 32 of this embodiment is preferably a spring, and it is also convenient to cooperate with the adjustment nut 7 to achieve the stability of the hole 10 after the size is adjusted.

[0056] In addition, it should be noted that the aforementioned seed cleaning brush 8 can be fixedly arranged on one side or both sides of the seeding wheel relative to the seeding wheel, or can rotate synchronously with the seeding wheel. In this embodiment, it is preferred to arrange the seed cleaning brush 8 to rotate synchronously with the seeding wheel. In order to achieve the synchronous rotation of the two, a driving component that can drive the seeding wheel and the seed cleaning brush 8 to rotate synchronously is provided on the seeding device housing 2. Specifically, Figure 1 Combination Figure 3 As shown, the driving assembly includes a driving shaft 3 for the seeding wheel to pivot on the seeding device housing 2, and a driven shaft 4 for the seed cleaning brush 8 to pivot. Sprockets 341 are respectively mounted on the driving shaft 3 and the driven shaft 4, and chains 34 are wound around the two sprockets 341.

[0057] In addition, the cross-sections of the driving shaft 3 and the driven shaft 4 of this embodiment are regular polygons, so that when the driving shaft 3 is connected and matched with the first wheel body 5 and the adjusting shaft 31, the driving shaft 3 can be rotated synchronously with the first wheel body 5 and the adjusting shaft 31, and when the driven shaft 4 is connected and matched with the seed cleaning brush 8, the driven shaft 4 can be rotated synchronously with the seed cleaning brush 8. Of course, in addition to the above-mentioned structural matching, the key can also be matched with the keyway on the shaft with a circular cross-section to achieve the synchronous rotation of the connection.

[0058] Of course, in addition to the structure of the chain 34 and the sprocket 341, the driving assembly can also realize the synchronous rotation of the seed wheel and the seed cleaning brush 8 through other structures in the prior art, such as driving the driving shaft 3 to rotate through gears or belts, thereby driving the driven shaft 4 to rotate synchronously with the driving shaft 3. Of course, when the gear structure is adopted, an intermediate gear and an intermediate shaft need to be provided, and this structure is relatively complicated.

[0059] When the seeding device with secondary seeding function of this embodiment is working, the external driver drives the active wheel to rotate, thereby driving the driven wheel to rotate, so that the seeds in the hole 10 are scraped by the seed cleaning brush 8, so that a certain amount of seeds are sown into the seed furrow. In addition, by adjusting the screwing in or out of the nut 7, the size of the hole 10 can be adjusted, thereby changing the number of seeds contained in the hole 10, thereby achieving the adjustment of the sowing amount and improving the sowing accuracy. In addition, the seed blocking plate 23 that can be intermittently opened and closed by the rotation of the seeding wheel can realize the secondary seeding of seeds, thereby improving the accuracy of seeds falling into the seed furrow and ensuring the consistency of adjacent plant spacing.

[0060] The seed meter with secondary seeding function of the present invention can not only adjust the sowing amount, but also realize secondary seeding of seeds, thereby improving the accuracy of seeds falling into the seed furrow, ensuring the consistency of adjacent plant spacing, and having better use effect.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A seed meter with secondary seeding function, Features include, A seeding mechanism is connected to the bottom of the seed box, the seeding mechanism comprising a seeding device housing (2), a cavity provided through the seeding device housing (2), a seeding wheel pivotally provided in the cavity in a direction perpendicular to the through direction, a seed cleaning brush (8) provided on the outer peripheral surface of the seeding wheel, the seeding wheel and the seed cleaning brush (8) dividing the cavity into an upper cavity connected to the seed box and a lower cavity connected to the seed groove; a plurality of holes (10) for accommodating seeds are provided on the outer peripheral surface of the seeding wheel, the seeds in the upper cavity are rotated by the seeding wheel and scraped by the seed cleaning brush (8), and the seeds only accommodated in the holes (10) are transferred from the upper cavity to the lower cavity and fall into the seed groove; A seed guide part is arranged below the seed metering device housing (2), and the seed guide part is constructed to allow the seeds to fall through the lower cavity to the seed guide groove (9) in the seed groove, and a seed blocking plate (23) is pivotally arranged at the bottom end of the seed guide groove (9), and the seed blocking plate (23) can be opened and closed by the rotation of the seed metering wheel, so that after the seeds fall above the seed blocking plate (23), the seed blocking plate (23) is intermittently opened to form a secondary seeding of the seeds; A transmission assembly constituting the opening and closing arrangement of the seed blocking plate (23) is provided between the seed blocking plate (23) and the seeding wheel, the transmission assembly comprising a transmission pull rod (24) connected to the seed blocking plate (23), a limit baffle (21) connected to the transmission pull rod (24) and rotatable relative to the seeding device housing (2), and an elastic return member (22) provided between the limit baffle (21) and the seeding device housing (2), the limit baffle (21) abutting against the outer peripheral surface of the seeding wheel so as to receive the rotation of the seeding wheel and to be separated from the outer peripheral surface of the seeding wheel and rotate, and the limit baffle (21) can maintain abutment with the outer peripheral surface of the seeding wheel due to the elastic force of the elastic return member (22); A plurality of stoppers (63) are evenly distributed in an array on the outer peripheral surface of one end of the seeding wheel and protrude outwardly in the radial direction of the seeding wheel, and one side of the limit baffle (21) abuts against the stopper (63); Corresponding to the limit baffle (21), a limit column (25) is constructed on the seed meter housing (2) to enable the limit baffle (21) to rotate within a certain angle.

2. The seed metering device with secondary seeding function according to claim 1, Features: The seeding wheel comprises a first wheel body (5) and a second wheel body (6) which are coaxially arranged. A plurality of cavities of different lengths are arranged circumferentially around the first wheel body (5) and are distributed alternately at intervals on the outer peripheral surface of the first wheel body (5). Each of the cavities is arranged to extend along the axial direction of the first wheel body (5). Corresponding to each of the cavities, a plurality of convex columns of different lengths are distributed alternately at intervals on the outer peripheral surface of the second wheel body (6), so that each of the convex columns is placed in the corresponding cavity to form a hole (10) for accommodating seeds.

3. The seed metering device with secondary seeding function according to claim 2, Features: The first wheel body (5) and the second wheel body (6) are both provided with mounting holes which are arranged through the axial direction of the seeding wheel and can allow the seeding wheel to be pivotally arranged on the seeding device housing (2), and an adjusting shaft (31) is inserted into the mounting hole of the second wheel body (6). The adjusting shaft (31) is fixed between the first wheel body (5) and the second wheel body (6), and an elastic pushing member (32) which can elastically press against the first wheel body (5) and the second wheel body (6) is mounted on the adjusting shaft (31). An adjusting nut (7) is screwed on one end of the adjusting shaft (31) located on the outer side of the second wheel body (6), and the size of the hole (10) can be adjusted by screwing the adjusting nut (7) in or out.

4. The seed metering device with secondary seeding function according to claim 3, Features: A guide limit protrusion (53) is formed in the mounting hole, and a guide groove (314) is formed on the adjustment shaft (31) corresponding to the guide limit protrusion (53).

5. The seed metering device with secondary seeding function according to claim 3, Features: The adjusting shaft (31) comprises a limit plate (311) abutting against the first wheel body (5), and a shaft neck section (312) connected to one side of the limit plate (311); the end of the shaft neck section (312) constitutes an extended section; and a pivot hole (313) having a cross-sectional shape of a regular polygon is formed at the axis of the adjusting shaft (31).

6. The seed metering device with secondary seeding function according to claim 1, Features: A driving mechanism component capable of driving the seeding wheel and the seed cleaning brush (8) to rotate synchronously is provided on the seeding device housing (2).

7. The seed metering device with secondary seeding function according to claim 1, Features: An auxiliary baffle is constructed on the seed guiding groove (9) to reduce the speed of the seeds during their falling process.

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