A precision seed metering device

Abstract

This invention discloses a precision seed metering device, comprising an outer cover and a housing forming a cavity structure, and a seed metering assembly disposed within the cavity structure. The outer cover has a seed inlet; the housing has a seed metering port on its side. The maximum central angle between the seed inlet and the seed metering port is not less than 20° and not more than 200°. Seeds enter through the seed inlet and exit through the seed metering port, with a maximum rotation angle not exceeding 200°, thus shortening the seed transport distance and extending seed life. Furthermore, this invention includes a seed baffle inclined towards the seed tray within the seed inlet chamber, making it easier for seeds to enter the seed metering holes on the seed tray, thereby improving the sowing rate.

Description

Technical Field

[0001] This invention belongs to the field of agricultural machinery technology, and in particular relates to a precision seed metering device. Background Technology

[0002] The seed metering device is the most important component of a seeder, and the quality of sowing depends on its structure and performance. Generally, the main unit of a seeder carries several seed metering devices that sow simultaneously. The function of the seed metering device is to evenly distribute a cluster of seeds into the seed holes.

[0003] There are various types of seed metering devices. Currently, commonly used seed metering devices include grooved wheel type, grinding disc type, centrifugal type, air suction type, perforated disc type, perforated wheel type, etc. Among them, the internal filling seed metering device is gradually being used. Patent application number 202120689137.8, entitled "A Finger Clip Ejector Precision Seeder", is an example of an internal filling seed metering device. However, in this type of seed metering device, the seed release gate 13 and the seed inlet 12 are arranged adjacent to each other. After the seeds enter from the seed inlet 12, they need to rotate almost one revolution before being discharged from the seed release gate 13. The seed transport distance is long, the resistance encountered by the seed disc rotation is large, and the wear and tear on the machine leads to a short lifespan for the seed metering device. Summary of the Invention

[0004] This invention aims to solve the problems mentioned in the background art by providing a seed metering device that prevents seed blockage and has a short transport distance, thereby improving the service life of the seed metering device.

[0005] In one aspect, the present invention provides a precision seed metering device, comprising an outer cover and a housing forming a cavity structure, and a seed metering assembly disposed within the cavity structure.

[0006] The outer cover is provided with a seed inlet; the side of the shell is provided with a seed outlet;

[0007] The seeding assembly includes: a seed disc disposed coaxially with the housing and rotating relative to it within the housing, and a bracket fixedly disposed coaxially with the seed disc within the seed disc with a small gap.

[0008] The support includes a support plate body coaxially arranged with the seed tray and a seed baffle connected to the end face of the support plate body facing the outer cover between the seed inlet and the seed outlet and fitting against the outer cover. The seed baffle is connected to the seed inlet and is inclined downward and towards the inner wall of the seed tray on one side of the support bearing mounting hole on the support plate body. The central angle between the seed inlet and the seed outlet with the seed baffle is not less than 20° and not more than 200°.

[0009] The outer cover, the seed tray, the support tray body, and the seed baffle together form the seed inlet chamber;

[0010] Multiple seed discharge holes are spaced around the circumference of the side wall of the seed tray. Seeds enter the seed inlet chamber through the seed inlet and are collected by the seed baffle into the gap between the seed tray and the shell. When the seed tray rotates, the seeds are carried out through the seed discharge hole.

[0011] Preferably, the seed baffle is an arc-shaped plate or a zigzag plate that connects to the seed inlet and extends to the seed outlet.

[0012] Preferably, the seeding component further includes:

[0013] A brush shaft is rotatably disposed on the end face of the support plate body facing the outer cover and abuts against the seed dispensing hole, and is used to brush away excess seeds in the seed dispensing hole before dispensing.

[0014] The seed baffle extends to the outer surface of the brush shaft;

[0015] The brush shaft is disposed in contact with both the outer cover and the support plate body.

[0016] Preferably, the seeding component further includes:

[0017] A seed stirring wheel is rotatably disposed on the end face of the support plate body facing the outer cover between the brush shaft and the seed baffle, and is adjacent to the brush shaft without gap. It is used to stir the seeds accumulated near the brush shaft to prevent blockage and affect the seeds from entering the seed discharge hole.

[0018] The seed baffle extends to the outer surface of the seed stirring wheel.

[0019] Preferably, the seed baffle includes a first arc-shaped segment and a first straight plate connected together; the arc of the first arc-shaped segment is consistent with the arc of the side of the support plate body and is connected to the edge of the support plate body, and the first arc-shaped segment is opposite to the seed inlet and together form a seed inlet; one end of the first straight plate is connected to one end of the first arc-shaped segment at an acute angle and is inclined downward toward the inner side of the seed plate on one side of the support bearing mounting hole, and the other end of the first straight plate does not extend to the edge of the support plate body;

[0020] The seed baffle also includes a connected second straight plate and a second arc segment;

[0021] The second straight plate and the first arc segment are respectively located on both sides of the first straight plate, and the second straight plate is connected to the first straight plate at an obtuse angle and extends to the outer surface of the seed stirring wheel;

[0022] The second arc-shaped segment extends toward the first arc-shaped segment and is connected at an acute angle to the second straight plate, covering the outer surface of the seed-stirring wheel;

[0023] The upper end of the seed baffle abuts against the outer cover, and the lower end is connected to the support plate body. The seed plate, the outer cover, the support plate body, the seed baffle, the seed stirring wheel, and the brush shaft constitute a closed seed inlet chamber.

[0024] Preferably, it also includes a transmission assembly, which comprises:

[0025] The first gear is fixed on the inner side of the bottom of the seed disc;

[0026] The second gear meshes with the first gear between the support plate body and the seed plate. The brush shaft and the second gear are respectively disposed on both sides of the support plate body and rotate synchronously relative to the support plate body.

[0027] The third gear meshes with the first gear between the support plate body and the seed plate. The seed stirring wheel and the third gear are respectively located on both sides of the support plate body and rotate synchronously relative to the support plate body.

[0028] Preferably, a support groove is provided on the end face of the support plate body on the side of the seed inlet chamber facing the outer cover to increase the volume of seeds.

[0029] Preferably, the seed baffle further includes a bracket connecting plate that connects the first straight plate and the bracket bushing mounting hole located at the center of the bracket disk body.

[0030] Preferably, a first baffle is provided between the brush shaft and the bracket bushing mounting hole, covering the side of the brush shaft and the seed stirring wheel facing the bracket bushing mounting hole.

[0031] Preferably, several rows of seed-distributing holes are arranged radially along the side wall of the seed tray, and a communicating groove is provided between two adjacent seed-distributing holes in each row;

[0032] The seed metering assembly also includes a seed-removing blade, which is fixedly mounted on the support plate body facing the outer cover and opposite to the seed metering port. The upper edge of the seed-removing blade is in contact with the outer surface of the brush shaft, and the lower edge abuts against the groove.

[0033] By adopting the above technical solution, the present invention has the following beneficial effects:

[0034] Compared with the prior art, the precision seed metering device of the present invention has the following advantages:

[0035] 1. In this invention, the central angle between the seed inlet 11 and the seed outlet 21 with the seed baffle is not less than 20° and not more than 200°. The seeds can be discharged from the seed outlet after being carried by the seed tray at a maximum angle of not more than 200°, which greatly shortens the seed transport distance, reduces resistance, and extends the service life of the seed metering device.

[0036] 2. The seed metering device of the present invention is provided with a seed baffle that tilts downwards and towards the inner side of the seed tray from the seed inlet, so that the seeds entering the seed chamber quickly approach the seed tray and enter the seed metering hole, thereby allowing the seeds to quickly enter the seed metering hole.

[0037] 3. The precision seed metering device of the present invention has a seed stirring wheel between the seed baffle and the brush shaft to prevent seeds from clogging near the brush shaft and burning out the seed metering device, thus improving safety;

[0038] 4. The seed metering device of the present invention is further provided with a seed-removing knife on the support plate body corresponding to the seed metering hole, and there is no gap between the seed-removing knife and the brush shaft, so that the removed seeds will not fall back to the center of the support plate body, thereby preventing damage to the seed metering device.

[0039] These and other features, aspects, and advantages of this application will become more readily understood with reference to the following description. The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. Attached Figure Description

[0040] This specification sets forth the complete and illustrative disclosure of this application, including its best practices, to those skilled in the art. Reference is made to the accompanying drawings, in which:

[0041] Figure 1 This is a front perspective view of a precision seed metering device provided in an embodiment of the present invention;

[0042] Figure 2 A three-dimensional back view of a precision seed metering device provided in an embodiment of the present invention;

[0043] Figure 3 This is a three-dimensional schematic diagram of the bottom surface of a precision seed metering device provided in an embodiment of the present invention;

[0044] Figure 4 This is a three-dimensional front view of a precision seed metering device after removing the outer cover, as provided in an embodiment of the present invention.

[0045] Figure 5 This is a front perspective view of a precision seed metering device after removing the outer cover and housing, provided in an embodiment of the present invention.

[0046] Figure 6 A front view of the seed tray of a precision seed metering device provided in an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of the back structure of the seed tray of a precision seed metering device provided in an embodiment of the present invention;

[0048] Figure 8 A front view of the support structure of a precision seed metering device provided in an embodiment of the present invention;

[0049] Figure 9 A front view of the support and third baffle of a precision seed metering device provided in an embodiment of the present invention;

[0050] Figure 10 A front view of the seed disc, first gear, second gear, and third gear meshing in a precision seed metering device provided in an embodiment of the present invention;

[0051] Figure 11 This is a three-dimensional schematic diagram of the seed-removing blade of a precision seed metering device provided in an embodiment of the present invention;

[0052] Figure 12 This is a schematic cross-sectional view of the seed disc and the first gear of a precision seed metering device provided in an embodiment of the present invention.

[0053] Figure label:

[0054] 1-Outer cover; 11-Seed inlet; 12-Drain outlet;

[0055] 2-Shell casing; 21-Seed discharge port; 22-Shell casing bushing mounting hole;

[0056] 3-Seed tray; 31-Seed discharge hole; 32-Groove;

[0057] 4-Bracket; 41-Bracket bushing mounting hole; 42-First bearing mounting hole; 43-Second bearing mounting hole; 44-Seed baffle; 441-First arc-shaped segment; 442-First straight plate; 443-Second straight plate; 444-Second arc-shaped segment; 445-Bracket connecting plate; 45-First baffle;

[0058] 46-Second baffle; 47-Dust groove; 48-Bracket groove;

[0059] 5-Shaft sleeve; 6-Transmission assembly; 61-First gear; 62-Third gear; 63-Seed stirring wheel;

[0060] 64 - Second gear; 65 - Brush shaft;

[0061] 7-Seed removal knife 7; 71-Seed removal blade. Detailed Implementation

[0062] The embodiments of this application will now be described in detail with reference to the figures, including one or more examples of embodiments of this application. Each example is provided for the purpose of explaining this application and not for limiting it. In fact, those skilled in the art will appreciate that various modifications and variations can be made to this application without departing from the scope or spirit of this application. For example, a feature illustrated or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, it is intended that this application cover such modifications and variations, which are within the scope of the appended claims and their equivalents. As used in this specification, the terms “first,” “second,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of the components. As used in this specification, unless the context clearly indicates otherwise, the terms “a,” “an,” “the,” and “the” are intended to indicate the presence of one or more elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be other elements in addition to those listed.

[0063] Referring now to the accompanying drawings, in which the same numbers in all the drawings denote the same elements, the present invention will be further explained and described below in conjunction with specific embodiments.

[0064] like Figures 1 to 3 The image shows a precision seed metering device provided by the present invention, which has a short seed transport distance, does not clog the seed metering device, has low resistance, and a long service life.

[0065] The precision seed metering device provided by the present invention includes an outer cover 1 and a housing 2 connected to form a cavity structure, and a seed metering component disposed within the cavity structure.

[0066] Both the outer cover 1 and the shell 2 are circular. The outer cover 1 has a seed inlet 11 on the upper part of its outer end face, and the shell 2 has a seed discharge outlet 21 on its side.

[0067] The shell 2 is specifically basin-shaped, and its bottom is provided with a shell bushing mounting hole 22. Of course, in some embodiments, the outer cover 1 and the shell 2 can be square or other shapes in addition to being circular.

[0068] Seeding components

[0069] like Figure 4 and 5 As shown, the seed metering assembly includes a seed disc 3 that is coaxially arranged within the housing 2 but rotates relative to the housing 2, and a bracket 4 that is fixedly arranged coaxially with the seed disc 3 within the seed disc 3 and with its small gap.

[0070] Specifically, such as Figures 5 to 9As shown, the seed disc 3, like the housing 2, is a circular cavity structure open at one end. The housing 2, seed disc 3, and support 4 all have bushing mounting holes at their centers. The bushing mounting holes on the seed disc 3 are directly fixed to the bushing 5. Bearings are also installed between the bushing mounting holes on the housing 2 and support 4 and the bushing 5. The bushing 5 has an internal spline at its center, and it is connected to the external main shaft via the internal spline. When the main shaft rotates, it drives the bushing 5 to rotate, thus causing the seed disc 3 to rotate together with the bushing 5. The housing 2 and support 4, due to the bearings, do not rotate together with the bushing 5.

[0071] The specific methods by which the bushing 5 is directly fixed to the bushing mounting hole on the seed disc 3 include interference fit, bonding, etc.

[0072] like Figure 6 and Figure 7 As shown, two rows of seed-discharging holes 31 are arranged around the circumference of the side wall of the seed tray 3, with multiple holes spaced apart in each row. When the seed tray 3 is driven to rotate, the seeds enter the seed-discharging holes 31 through the seed inlet 11 and are stored in the gap between the seed tray 3 and the shell 2. As the seed tray 3 rotates, the seeds are carried out from the seed-discharging outlet 21.

[0073] like Figure 8 and 9 As shown, the bracket 4 is disc-shaped, comprising a circular bracket disc body coaxially arranged with the seed disc 3 and a bracket bushing mounting hole 41 located at the center of the bracket disc body. To make the bracket 4 more securely installed, the bracket bushing mounting hole 41 is designed to extend beyond the surface of the bracket disc body by a certain length to match the length of the bushing 5.

[0074] To prevent the bracket 4 and housing 2 from rotating with the bushing 5, a bearing is provided between the bushing 5 and the bracket bushing mounting hole 41. The inner and outer rings of the bearing are fixedly connected to the bushing 5 and the bracket bushing mounting hole 41, respectively. The fixing method can be interference fit, bonding, etc.

[0075] In order to shorten the seed transport distance, the central angle between the seed inlet 11 and the seed outlet 21 is set to be relatively small, generally not less than 20° and not more than 200°.

[0076] In this embodiment, the central angle between the seed inlet 11 and the seed outlet 21 is less than 180° and greater than 90°.

[0077] The central angle between the seed inlet 11 and the seed outlet 21 mentioned here refers to the central angle between the center lines of the seed inlet 11 and the seed outlet 21. More specifically, it means that the central angle between the seed inlet 11 and the seed outlet 21 with the seed baffle 44 is not less than 20° and not more than 200°.

[0078] To ensure that seeds quickly enter the seed dispensing holes 31 on the seed tray 3 after entering the seed metering device through the seed inlet 11, the support 4 also includes a seed baffle 44 disposed on the end face of the support tray body facing the outer cover 1 between the seed inlet 11 and the seed dispensing port 21. The seed baffle 44 receives the seed inlet 11, is connected to the support tray body, and slopes downward toward the inner side of the seed tray 3 around the support bushing mounting hole 41, so that the seeds entering through the seed inlet 11 enter the space between the seed baffle 44 and the seed tray 3 which is closer to the seed baffle 44. With the rotation of the seed tray 3 and the gathering effect of the seed baffle 44, the seeds quickly enter the seed dispensing holes 31 on the seed tray 3.

[0079] Specifically, in this embodiment, the seed baffle 44 includes a first arc-shaped segment 441 and a first straight plate 442 connected together; wherein the arc of the first arc-shaped segment 441 is consistent with the arc of the support plate body and the outer surface of the seed plate 3, and the first arc-shaped segment 441 is opposite to the seed inlet 11, and the first arc-shaped segment 441 and the seed inlet 11 together form a seed entrance; one end of the first straight plate 442 is connected to one end of the first arc-shaped segment 441 at an acute angle, and the first straight plate 442 is directed downwards towards the inner side of the seed plate 3 relative to the seed inlet 11. The surface is inclined; therefore, the outer cover 1, seed tray 3, support tray body, first arc segment 441 and first straight plate 442 together form the seed inlet chamber. After the seeds enter the seed inlet chamber from the seed inlet 11, they can enter the seed discharge hole 31 more easily and quickly due to the pushing force of the seed baffle 44 tilting towards the inner side of the seed tray 3 and the weight of the seeds themselves. As the seed tray 3 is driven to rotate, it carries the seeds through the seed discharge hole 21 for sowing. When the seed tray 3 rotates, the support 4, shell 2 and outer cover 1 do not rotate.

[0080] After the seeds enter the seed inlet chamber through the seed inlet, they enter the seed discharge hole 31 on the seed tray 3 under their own gravity. However, sometimes excess seeds, along with impurities and seed fragments, enter the seed discharge hole 31 together, making it difficult for the seeds to detach from the seed discharge hole 31 and thus preventing sowing. Therefore, this invention also provides a transmission component 6 on the end face of the support tray body facing the outer cover 1 between the seed baffle 44 and the seed discharge port 21. The transmission component 6 includes a brush shaft 65, used to brush away excess seeds in the seed discharge hole 31 before the seeds are discharged through the seed discharge port 21. Figure 4 and 5As shown. To remove excess seeds, the brush shaft 65 needs to both contact the seed dispensing hole 31 and rotate. For this purpose, the transmission assembly includes a first gear 61 fixedly mounted on the inner side of the bottom of the seed tray 3, and a second gear 64 meshing with the first gear 61. The brush shaft 65 and the second gear 64 are respectively located on both sides of the support tray body and are coaxially arranged. Specifically, both the brush shaft 65 and the second gear 64 are fixedly connected to a second connecting shaft (not shown), which passes through a second bearing mounting hole 43 on the support tray body and connects to its bearing. When the first gear 61 is driven to rotate with the bushing 5, the second gear 64 causes the brush shaft 65 to rotate in the opposite direction to the first gear 61, brushing away excess seeds from the seed dispensing hole 31. To increase the stability of the brush shaft 65 during rotation, a bearing is installed at each of the upper and lower ends of the brush shaft 65, forming a double bearing configuration.

[0081] A large number of seeds entering the seed inlet 11 and accumulating together can easily cause blockage, affecting the entry of seeds into the seed discharge hole 31. Therefore, this invention provides a seed stirring wheel 63, which is adjacent to the brush shaft 65 without gap, within the seed inlet chamber between the brush shaft 65 and the seed discharge hole 21. Figure 4 and 5 As shown, the agitator 63 is used to stir the seeds to prevent blockage and ensure they enter the seed metering hole 31. It also prevents seeds from getting close to the bushing 5 through the gap between the brush shaft 65 and the agitator 63, thus preventing damage to the precision seed meterer. Therefore, to allow the agitator 63 to rotate, a third gear 62 is provided between the support 4 and the seed tray 3, meshing with the first gear 61. The agitator 63 and the third gear 62 are located on opposite sides of the support 4 and are coaxially arranged. Specifically, a first connecting shaft (not shown) is fixed to the agitator 63 and the third gear 62. The first connecting shaft passes through the first bearing mounting hole 42 on the support tray body and is connected to the bearing. Therefore, when the first gear 61 rotates, the third gear 62, along with the agitator 63 and the second gear 64, rotates in the opposite direction to the first gear 61, stirring the seeds accumulated near the agitator 63. Similarly, to increase the stability of the agitator 63 during rotation, a bearing is provided at each of the upper and lower ends of the agitator 63.

[0082] To prevent seeds from entering the internal chamber of the precision seed metering device through both ends of the brush shaft 65 and the seed stirring wheel 63, thereby damaging the precision seed metering device, both ends of the brush shaft 65 and the seed stirring wheel 63 are respectively in contact with the support plate body and the outer cover 1.

[0083] Furthermore, to prevent seeds from damaging the seed metering device by passing through the gap between the first straight plate 442 and the seed stirring wheel 63 and approaching the center of the seed tray 3, the seed baffle 44 also includes a second straight plate 443 with its upper end abutting against the outer cover 1 and its lower end connected to the support tray body, and a second arc-shaped segment 444. The second straight plate 443 and the first arc-shaped segment 441 are respectively located on opposite sides of the first straight plate 442, and the second straight plate 443 is connected to the first straight plate 442 at an obtuse angle and extends to the outer surface of the seed stirring wheel 63; the second arc-shaped segment 444 extends towards the first arc-shaped segment 441 and is connected to the second straight plate 443 at an acute angle, covering the outer surface of the seed stirring wheel 63. Therefore, the seed inlet chamber is a sealed space formed by the seed tray 3, the outer cover 1, the support tray body, the four baffles 441 to 444 of the seed baffle 44, the stirring wheel 63 and the brush shaft 65. Seeds entering this space through the seed inlet 11 enter the cavity between the seed tray 3 and the shell 2 through the seed discharge hole 31 on the seed tray 3, and are carried to the seed discharge port 21 for discharge as the seed tray 3 rotates. The seed inlet chamber is set as a sealed space to prevent seeds from entering the center of the seed meterer and damaging the seed meterer.

[0084] The first straight segment 442 and the second straight segment 443 together constitute the seed sliding track. Viewed from above the support plate body, the central angle from the first end of the first straight segment 442 to the second end of the second straight segment 443 relative to the center of the support plate body does not exceed 120°. The existing technology does not have the seed baffle or seed sliding track of this application; in this embodiment, the seed baffle 44 is disposed between the seed inlet 11 and the seed outlet 21. At this time, the central angle between the seed inlet 11 and the seed outlet 21 with the seed baffle 44 is less than 180° and greater than 100°. After entering the seed chamber, the seed rotates no more than 180° before being discharged from the seed outlet 21. In contrast, the seed inlet and seed outlet of the existing seed metering device are arranged adjacently, and the seed, after entering the seed chamber, rotates nearly 360° before being discharged from the seed outlet. Therefore, compared with the existing technology, this invention greatly shortens the seed transport distance, reduces resistance, and improves the service life of the seed metering device.

[0085] The seed baffle 44 mentioned above can be configured as a zigzag plate with multiple arc plates and straight plates connected together, or it can be configured as a single arc plate or a zigzag plate with multiple straight plates connected together. In short, it can be any type of plate, as long as it can be supported at the seed inlet 11 and set on one side of the support bearing mounting hole 41, and extend to the seed outlet 21. When a brush shaft 65 is provided, the seed baffle 44 can extend to the outer surface of the brush shaft 65. Furthermore, when a brush shaft 65 and a seed stirring wheel 63 are provided, it can extend to the outer surface of the seed stirring wheel 63.

[0086] Even with the aforementioned brush shaft 65, seeds may still get stuck in the seed dispensing hole 31 and cannot be brushed off. To address this, the present invention also provides a seed-removing blade 7 at the position corresponding to the seed dispensing port 21, which abuts against the brush shaft 65 and is fixed to the support plate body.

[0087] like Figure 11 As shown, the seed-removing blade 7 includes two parallel seed-removing blades 71, each corresponding to a row of seed holes 31. When the seed tray 3 rotates, the support 4 and the seed-removing blades 7 mounted on the support 4 remain stationary. To ensure that the seed-removing blades 7 can remove seeds stuck in the seed holes 31, grooves 32 are provided between adjacent seed holes 31 in the same row on the seed tray 3. Figure 11 As shown, so that the seed-removing blade 71 can contact the groove 32 to remove the seeds.

[0088] Furthermore, each seed-removing blade 71 has a contact portion 711 at its bottom that abuts against the groove 32. This contact portion 711 is a convex arc, and the contact portion of each seed-removing blade 71 abuts against the groove 32, such as... Figure 12 As shown, this removes the seeds stuck in the seed discharge hole 31.

[0089] In some embodiments, the contact portion 711 can also be any other shape, as long as the contact portion 711 is the lowest point of the seed-removing blade 71.

[0090] To prevent seeds brushed off by the brush shaft 65 from entering the rear part of the brush shaft 65 (near the seed discharge port) and being crushed by the seed-removing blade 7, the upper edge of the seed-removing blade 71 is in contact with the outer surface of the brush shaft 65, and the lower edge is in contact with the seed discharge hole 31 on the seed tray 3. There is no gap between the brush shaft 65 and the seed-removing blade 7, so the seeds brushed off by the brush cannot enter the rear part of the brush shaft 65.

[0091] In some embodiments, the two seed-removing blades 71 are not connected, but are fixed separately to the support plate body.

[0092] In order to allow the seed inlet chamber to hold more seeds, such as Figure 8 As shown, a support groove 48 is provided on the support plate body corresponding to the seed inlet chamber.

[0093] To increase the stability of the seed baffle 44 connection, the seed baffle 44 also includes a bracket connecting plate 445 that connects the first straight plate 442 and the bracket bushing mounting hole 41.

[0094] To prevent seeds from entering the brush on the brush shaft 65 and subsequently clogging the central area of ​​the support disc, thus damaging the precision seed metering device, the present invention provides a first baffle 45 on the side of the brush shaft 65 and the seed stirring wheel 63 facing the mounting hole 41 of the support shaft sleeve.

[0095] During the sowing process, there are impurities and dust in the seeds. The impurities and dust enter the brush on the brush shaft 65, and then enter the dust collection area between the first baffle 45 and the seed-removing knife 7, which are connected in the direction of rotation of the brush shaft 65. The dust collection area includes a dust groove 47 and a second baffle 46 set on the support plate body. The dust in the dust collection area is discharged through the drain port 12 on the outer cover 1.

[0096] like Figure 5 As shown, in order to prevent seeds from bursting out through the connection between the outer cover 1 and the shell 2 in the seed inlet chamber, the present invention also provides a third baffle 9 fixedly connected to the outer cover 1.

[0097] Therefore, the central angle between the seed inlet 11 and the seed outlet 21 of the present invention is not less than 20° and does not exceed 200°. Seeds enter the seed outlet hole 31 on the seed tray 3 through the seed inlet 11 and are carried by the rotation of the seed tray 3 for no more than 200° before being discharged from the seed outlet 21. In the prior art, the seed inlet 11 and the seed outlet 21 are arranged adjacent to each other, and the seeds are carried by the seed tray through the seed inlet and rotated nearly 360° before being discharged from the seed outlet. Compared with the prior art, the precision seed metering device of the present invention greatly shortens the seed transport distance, thereby reducing resistance and extending the life of the precision seed metering device. The central angle mentioned in the present invention refers to the angle formed by the lines connecting the center line of the seed inlet and the center line of the seed outlet in the seed chamber to the center of the seed tray.

[0098] Compared with the prior art, the seed metering device of the present invention has the following advantages:

[0099] 1. In this invention, the maximum central angle between the seed inlet 11 and the seed outlet 21 of the seed baffle 44 is not less than 20° and not more than 200°. The seeds can be discharged from the seed outlet after being carried by the seed tray 3 at a maximum angle not exceeding 200°, which greatly shortens the seed transport distance, reduces resistance, and extends the service life of the seed metering device.

[0100] 2. The seed metering device of the present invention is provided with a seed baffle that tilts downwards towards the seed tray from the seed inlet, so that the seeds entering the seed chamber quickly approach the seed tray and enter the seed metering hole, thereby allowing the seeds to quickly enter the seed metering hole.

[0101] 3. The seed metering device of the present invention has a seed stirring wheel between the seed baffle and the brush shaft to prevent seeds from clogging near the brush shaft and burning out the seed metering device, thus improving safety;

[0102] 4. The seed metering device of the present invention is further provided with a seed-removing knife on the support plate body corresponding to the seed metering hole, and there is no gap between the seed-removing knife and the brush shaft, so that the removed seeds will not fall back to the center of the support plate body, thereby preventing damage to the seed metering device.

[0103] This specification uses examples to disclose this application, including preferred embodiments, and also enables those skilled in the art to practice this application, including making and using any apparatus or system and performing any incorporated methods. The patentable scope of this application is defined by the claims and may include other embodiments conceived by those skilled in the art. Such other embodiments are deemed to be within the scope of the claims if they include structural elements that are not different from the literal language of the claims, or if they include equivalent structural elements that are not substantially different from the literal language of the claims.

Claims

1. A precision seed metering device, comprising an outer cover (1) and a housing (2) forming a cavity structure, and a seed metering assembly disposed within the cavity structure, characterized in that, The outer cover (1) is provided with a seed inlet (11); the shell (2) is provided with a seed outlet (21) on its side. The seeding assembly includes: a seed disc (3) which is coaxially spaced and rotates relative to the housing (2) within the housing (2), and a bracket (4) which is fixedly spaced coaxially with the seed disc (3) within the seed disc (3). The support (4) includes a support plate body coaxially arranged with the seed tray (3) and a seed baffle (44) connected to the end face of the support plate body facing the outer cover (1) between the seed inlet (11) and the seed outlet (21) and fitting against the outer cover (1). The seed baffle (44) is connected to the seed inlet (11) and is inclined downward and towards the inner wall of the seed tray (3) on the side of the support bushing mounting hole (41) on the support plate body. The central angle between the seed inlet (11) and the seed outlet (21) with the seed baffle (44) is not less than 20° and not more than 200°. The outer cover (1), the seed tray (3), the support tray body and the seed baffle (44) together form the seed inlet chamber; Multiple seed discharge holes (31) are arranged at intervals along the circumference of the side wall of the seed tray (3). Seeds enter the seed inlet chamber through the seed inlet (11) and are collected by the seed baffle (44) and enter the gap between the seed tray (3) and the shell (2). When the seed tray (3) rotates, it is carried out through the seed discharge hole (21). The seed baffle (44) is an arc-shaped or zigzag plate that connects to the seed inlet (11) and extends to the seed outlet (21); The seeding component also includes: A brush shaft (65) is rotatably disposed on the end face of the support plate body facing the outer cover (1) between the seed baffle (44) and the seed outlet (21) and abuts against the seed outlet hole (31) to brush away excess seeds in the seed outlet hole (31) before seeding. The seed baffle (44) extends to the outer surface of the brush shaft (65); The brush shaft (65) is disposed in contact with both the outer cover (1) and the support plate body; The seeding component also includes: The seed stirring wheel (63) is rotatably disposed on the end face of the support plate body facing the outer cover (1) between the brush shaft (65) and the seed baffle (44), and is adjacent to the brush shaft (65) without gap. It is used to stir the seeds piled up near the brush shaft (65) to prevent them from being blocked and affecting the seeds entering the seed discharge hole (31). The seed baffle (44) extends to the outer surface of the seed stirring wheel (63); The seed baffle (44) includes a first arc-shaped segment (441) and a first straight plate (442) connected together; the arc of the first arc-shaped segment (441) is consistent with the arc of the side of the support plate body and is connected to the edge of the support plate body, and the first arc-shaped segment (441) is opposite to the seed inlet (11) and together forms a seed inlet; one end of the first straight plate (442) is connected to one end of the first arc-shaped segment (441) at an acute angle and is inclined downward toward the inner side of the seed plate (3) avoiding the support bushing mounting hole (41); the other end of the first straight plate (442) does not extend to the edge of the support plate body; The seed baffle (44) also includes a connected second straight plate (443) and a second arc segment (444); The second straight plate (443) and the first arc segment (441) are respectively disposed on both sides of the first straight plate (442), and the second straight plate (443) is connected to the first straight plate (442) at an obtuse angle and extends to the outer surface of the seed stirring wheel (63); The second arc-shaped segment (444) extends toward the first arc-shaped segment (441) and is connected at an acute angle to the second straight plate (443) to cover the outer surface of the seed stirring wheel (63); The upper end of the seed baffle (44) abuts against the outer cover (1), and the lower end is connected to the support plate body. The seed plate (3), the outer cover (1), the support plate body, the seed baffle (44), the seed stirring wheel (63), and the brush shaft (65) constitute a closed seed inlet chamber.

2. The precision seed metering device as described in claim 1, characterized in that, It also includes a transmission assembly (6), which comprises: The first gear (61) is fixed on the inner side of the bottom of the seed disc (3); The second gear (64) meshes with the first gear (61) between the support plate body and the seed plate (3). The brush shaft (65) and the second gear (64) are respectively disposed on both sides of the support plate body and rotate synchronously relative to the support plate body. The third gear (62) meshes with the first gear (61) between the support plate body and the seed plate (3). The seed stirring wheel (63) and the third gear (62) are respectively located on both sides of the support plate body and rotate synchronously relative to the support plate body.

3. The precision seed metering device as described in any one of claims 1 to 2, characterized in that, A support groove (48) is provided on the end face of the support plate body on the side of the seed inlet chamber facing the outer cover (1) to increase the volume of seeds.

4. The precision seed metering device as described in claim 1, characterized in that, The seed baffle (44) also includes a bracket connecting plate (445) that connects the first straight plate (442) and the bracket bushing mounting hole (41) provided at the center of the bracket disk body.

5. The precision seed metering device as described in claim 1 or 4, characterized in that, A first baffle (45) is provided between the brush shaft (65) and the bracket bushing mounting hole (41) to cover the side of the brush shaft (65) and the seed stirring wheel (63) facing the bracket bushing mounting hole (41).

6. The precision seed metering device as described in claim 1, characterized in that, Several rows of seed holes (31) are arranged radially along the side wall of the seed tray (3), and a communicating groove (32) is provided between two adjacent seed holes (31) in each row. The seed metering assembly also includes a seed-removing blade (7), which is fixedly mounted on the support plate body facing the outer cover (1) and opposite to the seed metering port (21). The upper edge of the seed-removing blade (7) is in contact with the outer surface of the brush shaft (65), and the lower edge is in contact with the groove (32).

Images