Air suction type precision seed sowing device

Abstract

The invention provides an air suction type precision seed sowing device, and relates to the technical field of agricultural machinery. A seed inlet and a mounting port which are communicated with the accommodating cavity are formed in the side wall of the shell in the air-suction type precision seed-metering device in a staggered manner; the seed metering disc divides the accommodating cavity into a seed filling cavity and an auxiliary cavity, the seed inlet and the mounting opening are both communicated with the seed filling cavity, and a plurality of seed suction holes are formed in the edge of the seed metering disc at intervals; a seed metering pipe assembly in the seed metering mechanism is arranged in the seed filling cavity through a mounting opening, a seed metering opening capable of being communicated with the seed suction hole is formed in the side wall, facing the seed metering disc, of the seed metering pipe assembly, and a seed blocking assembly is adjustably arranged at the outlet end of the seed metering pipe assembly, so that the position, relative to the outlet end of the seed metering pipe assembly, of a seed blocking plate can be adjusted; the seed pushing assembly and the seed inlet are correspondingly arranged in the shell, at least part of the seed pushing assembly extends into the seed filling cavity, and the seed pushing assembly reciprocates in the thickness direction of the shell. The air suction type precision seed-metering device can improve the adsorption reliability and the landing stability, and improve the seed-metering speed and the seed-metering precision.

Description

Technical Field

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

[0002] As an important food crop, wheat's seed metering quality directly affects its final yield and economic benefits. Precision metering technology enables precise single-seed planting, effectively saving seeds, reducing thinning costs, and ensuring adequate growing space for the crop, which is of great significance for improving wheat yield and quality. Air-suction seed meters are widely used in wheat precision metering due to their advantages such as good adaptability to seed size, low seed damage rate, and high metering accuracy.

[0003] Existing air-suction seed metering devices, when used in early sowing conditions, are susceptible to interference from external environmental factors such as field airflow and ground disturbance when wheat seeds detach from the metering device and land freely. This results in uneven seed distribution and deviations in seed placement, affecting the uniformity of plant spacing and seedling emergence. At the same time, seed accumulation at the seed inlet and the considerable distance between the seeds and the seed metering disc lead to a low success rate of negative pressure adsorption, resulting in missed or empty adsorption. This not only reduces seed metering accuracy but also decreases operating speed and seed metering efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an air-suction precision seed metering device, which can improve adsorption reliability and landing stability, as well as seeding speed, seeding accuracy and seeding uniformity.

[0005] To achieve this objective, the present invention adopts the following technical solution: A pneumatic precision seed metering device is used for installation on a seed metering machine, the pneumatic precision seed metering device comprising: The housing has a receiving cavity inside, and the side wall of the housing is provided with a seed inlet and an installation port that are both communicating with the receiving cavity; A seed metering tray is rotatably disposed within the receiving cavity, and the receiving cavity is divided into a seed filling cavity and an auxiliary cavity along the thickness direction of the shell. The seed inlet and the mounting port are both connected to the seed filling cavity. Multiple seed suction holes are provided at intervals along the edge of the seed metering tray. The negative pressure part in the auxiliary cavity is configured to adsorb the seeds at the seed inlet onto the corresponding seed suction holes. The pressure relief part in the auxiliary cavity is configured to remove the seeds in the corresponding seed suction holes from the seed metering tray. The seed dispensing mechanism includes a seed dispensing tube assembly and a seed blocking assembly. The seed dispensing tube assembly is disposed in the seed filling cavity through the mounting port, and the seed dispensing tube assembly has a seed dispensing port on the side wall facing the seed dispensing tray. The seed dispensing port can be selectively connected to one of the plurality of seed suction holes. The seed blocking assembly is adjustablely disposed at the outlet end of the seed dispensing tube assembly so that the seed blocking plate in the seed blocking assembly can be adjusted to the relative position with the outlet end of the seed dispensing tube assembly. A seed-pushing component is placed in the housing corresponding to the seed inlet, and at least a portion of the seed-pushing component extends into the seed filling cavity. The seed-pushing component is configured to reciprocate along the thickness direction of the housing.

[0006] As a further technical solution, the seed blocking assembly includes an adjusting rod, a first universal joint, a second universal joint, and an adjusting ring. The adjusting ring is sleeved on the end of the seed metering tube assembly away from the housing. The first end of the adjusting rod is adjustablely disposed on the adjusting ring. The second universal joint is connected to the second end of the adjusting rod through the first universal joint. The seed blocking plate is connected to the side of the second universal joint away from the first universal joint and can block part of the outlet end of the seed metering tube assembly.

[0007] As a further technical solution, the stop assembly also includes a limiting rod, the adjusting ring is provided with an adjusting slot, the adjusting slot extends circumferentially along the adjusting ring, the adjusting rod is provided with an arc-shaped adjusting block in the middle, the arc-shaped adjusting block is disposed in the adjusting slot and is limited in the adjusting slot by the limiting rod.

[0008] As a further technical solution, a limiting groove is provided at one end of the seeding tube assembly away from the housing, and an adjusting protrusion is provided on the inner peripheral wall of the adjusting ring, the adjusting protrusion being engaged with the limiting groove.

[0009] As a further technical solution, the seed dispensing mechanism also includes a seed blowing pipe, which is disposed in the housing corresponding to the seed dispensing port and communicates with the auxiliary cavity.

[0010] As a further technical solution, the seed pushing assembly includes a seed pushing block, a seed pushing shaft, a return spring, a seed pushing cam, and a rotary motor, and the housing is provided with a mounting groove; The seed-pushing shaft is inserted into the mounting groove, the seed-pushing block is disposed at the first end of the seed-pushing shaft, the return spring is sleeved in the middle of the seed-pushing shaft, and the two ends of the return spring are respectively connected to the seed-pushing block and the housing, the rotary motor is connected to the seed metering machine, and the seed-pushing cam is driven and connected to the output shaft of the rotary motor, and is correspondingly disposed at the second end of the seed-pushing shaft.

[0011] As a further technical solution, the seed pushing component includes a seed pushing block, a seed pushing shaft and a reciprocating motor, and the housing is provided with a mounting groove; The seed-pushing shaft is inserted into the mounting slot, the seed-pushing block is disposed at the first end of the seed-pushing shaft, and the second end of the seed-pushing shaft is connected to the output shaft of the reciprocating motor.

[0012] As a further technical solution, along the circumference of the seed metering disc, a plurality of first seed-disturbing protrusions and / or a plurality of second seed-disturbing protrusions are provided at intervals on the seed metering disc, the plurality of first seed-disturbing protrusions are all located near the center of the seed metering disc, and the plurality of second seed-disturbing protrusions are all located near the edge of the seed metering disc.

[0013] As a further technical solution, a seed cleaning port is provided at the lower end of the shell, the seed cleaning port is connected to the seed filling cavity, and an oscillation component is adjustablely provided on the shell, the oscillation component is disposed in the seed filling cavity and is correspondingly disposed to the seed cleaning port.

[0014] As a further technical solution, the air-suction precision seed metering device also includes a scraper assembly. The scraper assembly is adjustablely disposed in the seed filling chamber. The scraper blade in the scraper assembly is configured to scrape off excess seeds in the seed suction holes so that the seeds adsorbed in each seed suction hole are in a single-seed state.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The air-suction precision seed metering device provided by the present invention includes a housing with a receiving cavity, a seed metering disc rotatably disposed in the receiving cavity, the receiving cavity being divided into a seed filling cavity and an auxiliary cavity along the thickness direction of the housing, the seed inlet and the installation port being connected to the seed filling cavity; the seed metering port on the seed metering tube assembly can be selectively connected to one of a plurality of seed suction holes, the seed blocking assembly is adjustablely disposed at the outlet end of the seed metering tube assembly so that the seed blocking plate in the seed blocking assembly can be adjusted to the relative position with the outlet end of the seed metering tube assembly, and the seed pushing assembly is placed in the housing corresponding to the seed inlet, and at least part of the seed pushing assembly extends into the seed filling cavity, the seed pushing assembly being configured to reciprocate along the thickness direction of the housing. When the seeds are fed into the filling chamber, they are adsorbed into the suction holes located in the negative pressure section. As the seed metering disc rotates, the suction holes with adsorbed seeds rotate to the pressure relief section. At this time, the seeds are no longer under negative pressure and therefore fall into the seed metering port under the action of gravity and land freely through the seed metering tube assembly. Throughout the process, as seeds land freely, the relative positions of the seed baffle and the outlet end of the seed metering pipe assembly can be adjusted according to factors such as current field airflow and ground disturbance to reduce the impact of external factors such as field airflow and ground disturbance on seed landing, thereby improving the uniformity and stability of seed landing, and thus improving the consistency of plant spacing and seedling emergence effect. At the same time, when the seeds in the seed filling chamber are adsorbed into the seed suction holes located in the negative pressure section, the reciprocating motion of the seed pushing component disturbs the seed pile at the seed inlet and shortens the distance between the seeds and the seed metering plate, thereby increasing the success rate of seeds being adsorbed into the seed suction holes and reducing the probability of missed suction and empty suction, so as to improve the seed metering speed and efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the air-suction precision seed metering device provided in an embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 yes Figure 1 A magnified view of a section at point B in the middle; Figure 4 This is a schematic diagram of the seed-blocking component in the air-suction precision seed metering device provided in an embodiment of the present invention; Figure 5 This is a partial structural schematic diagram from a first-view perspective of the air-suction precision seed metering device provided in an embodiment of the present invention; Figure 6 This is a partial structural schematic diagram from a second perspective of the air-suction precision seed metering device provided in an embodiment of the present invention; Figure 7 This is a partial structural schematic diagram from a third perspective of the air-suction precision seed metering device provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the scraper assembly in the air-suction precision seed metering device provided in an embodiment of the present invention.

[0018] In the picture: 100. Shell; 110. Seed inlet; 120. Mounting port; 130. Seed cleaning port; 140. Mounting plate; 141. First adjustment groove; 101. Negative pressure section; 102. Pressure relief section; 103. Second adjustment groove; 200. Seed metering tray; 201. Seed suction hole; 202. First seed disturbing boss; 203. Second seed disturbing boss; 300. Seed metering mechanism; 310. Seed metering tube assembly; 3102. Limiting groove; 311. Venturi tube; 312. Seed metering extension tube; 320. Seed blocking assembly; 321. Seed blocking plate; 322. Adjusting rod; 3221. Arc-shaped adjusting block; 323. First universal joint; 324. Second universal joint; 325. Adjusting ring; 3251. Adjusting slot; 3252. Adjusting protrusion; 3253. Limiting insertion hole; 326. Limiting insertion rod; 330. Air blowing pipe; 400, Seed pushing assembly; 410, Seed pushing block; 420, Seed pushing shaft; 440, Seed pushing cam; 500. Oscillating component; 510. Oscillating plate; 520. Vibration motor; 600. Scraper assembly; 610. Movable crank; 620. Mounting component; 630. Limiting plate; 640. Seed scraper; 650. Adjusting bolt. Detailed Implementation

[0019] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0020] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0021] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0022] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0023] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0024] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0025] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0026] Combination Figures 1 to 8As shown, the pneumatic precision seed metering device provided in this embodiment is used to install on a seed metering machine, thereby improving adsorption reliability and landing stability, as well as increasing seed metering speed and efficiency. The pneumatic precision seed metering device includes a housing 100, a seed metering disc 200, a seed metering mechanism 300, and a seed pushing assembly 400. The housing 100 has a receiving cavity, and a seed inlet 110 and an installation port 120, both communicating with the receiving cavity, are offset on the side wall of the housing 100. The seed metering disc 200 is rotatably disposed within the receiving cavity and divides the receiving cavity into a filling cavity and an auxiliary cavity along the thickness direction of the housing 100. Both the seed inlet 110 and the installation port 120 communicate with the filling cavity. Multiple seed suction holes 201 are spaced apart along the edge of the seed metering disc 200. The negative pressure part 101 in the auxiliary cavity is configured to adsorb seeds at the seed inlet 110 into the corresponding seed suction hole 201, and the pressure relief part 102 in the auxiliary cavity is configured to detach seeds from the corresponding seed suction hole 201. The seed metering tray 200 and the seed metering mechanism 300 include a seed metering tube assembly 310 and a seed blocking assembly 320. The seed metering tube assembly 310 is disposed in the seed filling cavity through the mounting port 120, and the seed metering tube assembly 310 is provided with a seed metering port facing the side wall of the seed metering tray 200. The seed metering port can be selectively connected to one of a plurality of seed suction holes 201. The seed blocking assembly 320 is adjustablely disposed at the outlet end of the seed metering tube assembly 310 so that the seed blocking plate 321 in the seed blocking assembly 320 can be adjusted to be relatively positioned relative to the outlet end of the seed metering tube assembly 310. The seed pushing assembly 400 is disposed in the housing 100 corresponding to the seed inlet 110, and at least part of the seed pushing assembly 400 extends into the seed filling cavity. The seed pushing assembly 400 is configured to reciprocate along the thickness direction of the housing 100.

[0027] Since the seed metering disc 200 is rotatably disposed in the receiving cavity, the receiving cavity is divided into a seed filling cavity and an auxiliary cavity along the thickness direction of the housing 100. The seed inlet 110 and the mounting port 120 are both connected to the seed filling cavity. The seed metering port on the seed metering tube assembly 310 can be selectively connected to one of the multiple seed suction holes 201. The seed blocking assembly 320 is adjustablely disposed at the outlet end of the seed metering tube assembly 310 so that the seed blocking plate 321 in the seed blocking assembly 320 can be adjusted to the relative position with the outlet end of the seed metering tube assembly 310. The seed pushing assembly 400 is placed in the housing 100 corresponding to the seed inlet 110, and at least part of the seed pushing assembly 400 extends into the seed filling cavity. The seed pushing assembly 400 is configured to reciprocate along the thickness direction of the housing 100. When the seeds are fed into the filling chamber, they are adsorbed into the suction holes 201 located in the negative pressure section 101. As the seed metering disc 200 rotates, the suction holes 201 with the adsorbed seeds rotate to the pressure relief section 102. At this time, the seeds are no longer under negative pressure and fall into the seed metering port under the action of gravity, and land freely through the seed metering tube assembly 310. Throughout the process, when the seeds land freely, the relative positions of the seed baffle plate 321 and the outlet end of the seed metering pipe assembly 310 can be adjusted according to factors such as the current field airflow and ground disturbance to reduce the impact of external factors such as field airflow and ground disturbance on seed landing, thereby improving the uniformity and stability of seed landing, and thus improving the uniformity of plant spacing and seedling emergence effect. At the same time, when the seeds in the seed filling cavity are adsorbed into the seed suction hole 201 located in the negative pressure part 101, the seed pushing assembly 400 reciprocates, disturbing the seed pile at the seed inlet 110 and shortening the distance between the seeds and the seed metering plate 200, thereby increasing the success rate of seeds being adsorbed into the seed suction hole 201, reducing the probability of missed suction and empty suction, and improving the seed metering speed and efficiency.

[0028] Preferably, the seed-blocking assembly 320 includes an adjusting rod 322, a first universal joint 323, a second universal joint 324, and an adjusting ring 325. The adjusting ring 325 is sleeved on the end of the seed-discharging tube assembly 310 away from the housing 100. The first end of the adjusting rod 322 is adjustablely disposed on the adjusting ring 325. The second universal joint 324 is connected to the second end of the adjusting rod 322 through the first universal joint 323. The seed-blocking plate 321 is connected to the side of the second universal joint 324 away from the first universal joint 323 and can block part of the outlet end of the seed-discharging tube assembly 310. (Specific details to be added later.) Figure 2 and Figure 4As shown, by adjusting the first universal joint 323 or the second universal joint 324, the relative position of the seed baffle 321 and the outlet end of the seed metering tube assembly 310 is adjusted along the circumference of the outlet end of the seed metering tube assembly 310. By adjusting the included angle between the first universal joint 323 and the second universal joint 324, the included angle and relative position between the seed baffle 321 and the outlet end of the seed metering tube assembly 310 are adjusted, thereby adjusting the blocking position and blocking area of ​​the seed baffle 321 on the outlet end of the seed metering tube assembly 310, so as to improve the uniformity and stability of the seeds after landing.

[0029] Furthermore, the seed blocking assembly 320 also includes a limiting rod 326, an adjusting groove 3251 is provided on the adjusting ring 325, the adjusting groove 3251 extends circumferentially along the adjusting ring 325, an arc-shaped adjusting block 3221 is provided in the middle of the adjusting rod 322, the arc-shaped adjusting block 3221 is provided in the adjusting groove 3251, and is limited in the adjusting groove 3251 by the limiting rod 326. Multiple limiting holes 3253 are spaced circumferentially on the outer peripheral wall of the adjusting ring 325. The relative position of the arc-shaped adjusting block 3221 within the adjusting slot 3251 can be adjusted to change the blocking position of the seed baffle 321 on the outlet end of the seed metering tube assembly 310. After adjustment, the limiting rod 326 is inserted into the corresponding limiting hole 3253 and pressed against the arc-shaped adjusting block 3221, thereby limiting the relative position of the seed baffle 321 and preventing it from moving independently during seed metering. Alternatively, the adjusting rod 322 can be a screw inserted into the adjusting slot 3251. Two adjusting nuts are mounted on the screw, located on either side of the adjusting ring 325. Loosening one nut adjusts the blocking position of the seed baffle 321 on the outlet end of the seed metering tube assembly 310, while tightening both nuts limits the blocking position of the seed baffle 321. Alternatively, an arc-shaped adjusting block 3221 may be provided in the middle of the adjusting rod 322, and both ends of the adjusting rod 322 may be provided as screws, with adjusting nuts provided on both screws. (Specific details may vary.) Figure 4 As shown, this is used to adjust or limit the seed baffle 321.

[0030] Preferably, a limiting groove 3102 is provided at the end of the seed metering tube assembly 310 facing away from the housing 100, and an adjusting protrusion 3252 is provided on the inner peripheral wall of the adjusting ring 325, which engages with the limiting groove 3102. By engaging the adjusting protrusion 3252 with the limiting groove 3102, the relative position of the adjusting ring 325 and the seed metering tube assembly 310 is limited in the circumferential direction of the adjusting ring 325, thereby further improving the uniformity and stability of seed landing. In this embodiment, multiple adjusting protrusions 3252 are spaced apart along the circumferential direction of the adjusting ring 325, and the position and number of the upper limiting groove 3102 on the seed metering tube assembly 310 correspond one-to-one with the multiple adjusting protrusions 3252.

[0031] Furthermore, the seed dispensing mechanism 300 also includes a seed blowing pipe, which is disposed in the housing 100 corresponding to the seed dispensing port and communicates with the auxiliary cavity.

[0032] Combination Figure 1 and Figure 5 As shown, the seed blowing pipe is connected to the air blowing device (not shown in the figure). The seed dispensing pipe assembly 310 includes a venturi tube 311 and a seed dispensing extension tube 312. The seed dispensing port is located in the middle of the venturi tube 311. The upper end of the venturi tube 311 extends out of the housing 100, and the lower end is connected to the upper end of the seed dispensing extension tube 312. The lower end of the seed dispensing extension tube 312 is configured as a bent part. The seed blocking assembly 320 is located in the bent part. The seed blowing pipe and the seed dispensing port are correspondingly arranged in the housing 100 and are connected to the auxiliary cavity. When the seed metering disc 200 rotates so that the seed suction hole 201 containing the seeds is opposite to the seed dispensing port, the seed suction hole 201 is located in the pressure relief section 102. Since the seed dispensing port is located in the middle of the venturi tube 311, the venturi tube 311 itself has an adsorption and guiding effect on the seeds, thereby improving the stability of seed transport and preventing the seeds from bouncing, deviating, or getting stuck after leaving the seed metering disc 200. At the same time, since the seed blowing pipe is opposite to the seed dispensing port and is connected to the air blowing device, air is blown through the air blowing pipe 330. Under the action of the seeds' own weight, the adsorption force of the venturi tube 311 on the seeds, and the horizontal blowing force of the air blowing pipe 330 on the seeds, the seeds can be ensured to fall smoothly into the seed dispensing port, thereby improving the stability and efficiency of the seeds falling from the seed metering disc 200 into the venturi tube 311, and further improving the seed dispensing uniformity and speed.

[0033] Furthermore, the seed-pushing assembly 400 includes a seed-pushing block 410, a seed-pushing shaft 420, a return spring, a seed-pushing cam 440, and a rotary motor. The housing 100 has a mounting groove. The seed-pushing shaft 420 is inserted into the mounting groove, the seed-pushing block 410 is positioned at the first end of the seed-pushing shaft 420, the return spring is sleeved on the middle of the seed-pushing shaft 420, and both ends of the return spring are connected to the seed-pushing block 410 and the housing 100, respectively. The rotary motor is connected to the seed metering machine, and the seed-pushing cam 440 is drivenly connected to the output shaft of the rotary motor and is correspondingly positioned at the second end of the seed-pushing shaft 420. During the seed metering process, as the output shaft of the rotary motor rotates, it drives the seed-pushing cam 440 to rotate, causing the seed-pushing cam 440 to abut or disengage from the seed-pushing shaft 420. Under the action of the seed-pushing cam 440 and the return spring, the seed-pushing block 410 moves closer to or further away from the seed metering disc 200, thereby disturbing the seed pile and shortening the distance between the seeds and the seed metering disc 200.

[0034] In some other embodiments, the seed-pushing assembly 400 includes a seed-pushing block 410, a seed-pushing shaft 420, and a reciprocating motor. A mounting groove is provided on the housing 100. The seed-pushing shaft 420 is inserted into the mounting groove, the seed-pushing block 410 is disposed at the first end of the seed-pushing shaft 420, and the second end of the seed-pushing shaft 420 is drively connected to the output shaft of the reciprocating motor. During the seed dispensing process, as the output shaft of the reciprocating motor rotates, it drives the seed-pushing shaft 420 and the seed-pushing block 410 to reciprocate, thereby disturbing the seed pile and shortening the distance between the seeds and the seed dispensing tray 200.

[0035] Furthermore, along the circumference of the seed metering disc 200, multiple first seed-disturbing protrusions 202 and / or multiple second seed-disturbing protrusions 203 are evenly spaced on the seed metering disc 200. The multiple first seed-disturbing protrusions 202 are all located near the center of the seed metering disc 200, and the multiple second seed-disturbing protrusions 203 are all located near the edge of the seed metering disc 200. The multiple first seed-disturbing protrusions 202 and the multiple second seed-disturbing protrusions 203 can sufficiently agitate the seeds entering the seed filling cavity, ensuring adequate seed agitation and reducing the seed metering device's missed seeding rate. Specifically, along the rotation direction of the seed metering disc 200, the multiple first seed-disturbing protrusions 202 are all designed in a fan-blade shape, and the multiple second seed-disturbing protrusions 203 are all designed in a "V" shape.

[0036] Furthermore, a seed cleaning port 130 is provided at the lower end of the housing 100, which is connected to the seed filling cavity. An oscillation component 500 is adjustablely provided on the housing 100, which is located in the seed filling cavity and corresponds to the seed cleaning port 130.

[0037] Specific combination Figure 1 and Figure 3 As shown, the oscillation assembly 500 includes an oscillation plate 510 and an oscillation motor. A second adjustment groove 103 is provided on the housing 100. One end of the oscillation plate 510 is adjustablely connected to the second adjustment groove 103, and the other end of the oscillation plate 510 extends radially along the seed metering disc 200. The oscillation motor is located on the oscillation plate 510. The second adjustment groove 103 is an arc-shaped groove concentric with the midpoint of the seed metering disc 200. During the seed metering process, activating the vibration motor 520 can further enhance the disturbance effect on the seeds in the seed filling chamber, further reducing the seed metering device's missed seeding rate. Furthermore, when seeds accumulate or become blocked in the seed filling chamber, the vibrating motor is adjusted to vibrate and clear the accumulated seeds from the seed cleaning port 130 out of the seed filling chamber without disassembling the entire air-suction precision seed metering device. Since one end of the vibrating plate 510 is adjustable to the second adjustment groove 103, the relative position of the vibrating plate 510 in the second adjustment groove 103 can be adjusted to change the seed filling amount inside the seed filling chamber, thus adapting to seed metering operations with different seed dispensing amounts. For example, when there are fewer seeds, rotating the vibrating plate 510 away from the seed cleaning port 130 reduces the seed filling amount, thereby increasing the population density and seed pile height, and ultimately improving the seed filling and adsorption success rate. Preferably, the air-suction precision seed metering device further includes a scraper assembly 600, which is adjustablely positioned in the seed filling chamber. The scraper blade 640 in the scraper assembly 600 is configured to scrape off excess seeds in the seed suction holes 201, ensuring that the seeds adsorbed in each seed suction hole 201 are in a single-seed state. By setting the scraper assembly 600, during the seed metering process, as the seed metering disc 200 rotates, the scraper assembly 600 can scrape off the excess seeds adsorbed in the remaining seed suction holes 201 that have not achieved single-seed status, causing most of the excess seeds in the seed suction holes 201 that exhibit "re-suction" to fall off, effectively solving the problem of re-suction in the seed suction holes 201 on the seed metering disc 200, which leads to re-seeding during the seed metering process.

[0038] Specifically, the scraper assembly 600 includes a movable crank 610, a mounting component 620, a limiting plate 630, a seed scraper 640, and an adjusting bolt 650. The housing 100 is provided with a mounting port 120, which communicates with the seed filling chamber and is located between the seed inlet 110 and the seed outlet. The housing 100 is provided with a mounting plate 140 corresponding to the mounting port 120, and the mounting plate 140 is provided with a plurality of first adjusting grooves 141 at intervals. The first end of the movable crank 610 is rotatably connected to the mounting plate 140, and the second end is rotatably connected to one of the first adjusting grooves 141. The seed scraper 640 is adjustablely mounted on the mounting component 620 by the adjusting bolt 650. Part of the seed scraper 640 is located in the seed filling chamber through the mounting port 120. The side of the seed scraper 640 away from the mounting component 620 is set in a wave shape or a sawtooth shape to further improve the seed scraping effect. The limiting plate 630 is provided on the side of the mounting component 620 close to the housing 100. The installation stability and performance of the scraper assembly 600 are improved by setting the mounting plate 140; the relative position of the scraper blade 640 in the radial direction of the seed metering disc 200 is adjusted by turning the adjusting bolt 650 or replacing the movable crank 610 with one of different specifications; and the relative position of the scraper blade 640 in the radial direction of the seed metering disc 200 is restricted by setting the limiting plate 630 to prevent the scraper blade 640 from extending too far into the seed filling cavity and damaging the seeds adsorbed on the seed metering disc 200.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An air-suction precision seed metering device for installation in a seed metering machine, characterized in that, The air-suction precision seed metering device includes: The housing (100) has a receiving cavity inside, and the side wall of the housing (100) is provided with a seed inlet (110) and an installation port (120) that are both connected to the receiving cavity. The seed metering tray (200) is rotatably disposed in the receiving cavity and divides the receiving cavity into a seed filling cavity and an auxiliary cavity along the thickness direction of the housing (100). The seed inlet (110) and the mounting port (120) are both connected to the seed filling cavity. The edge of the seed metering tray (200) is provided with a plurality of seed suction holes (201) at intervals. The negative pressure part (101) in the auxiliary cavity is configured to adsorb the seeds at the seed inlet (110) onto the corresponding seed suction hole (201). The pressure relief part (102) in the auxiliary cavity is configured to remove the seeds in the corresponding seed suction hole (201) from the seed metering tray (200). The seed metering mechanism (300) includes a seed metering tube assembly (310) and a seed blocking assembly (320). The seed metering tube assembly (310) is disposed in the seed filling cavity through the mounting port (120), and the seed metering tube assembly (310) is provided with a seed metering port on the side wall facing the seed metering disc (200). The seed metering port can be selectively connected to one of the plurality of seed suction holes (201). The seed blocking assembly (320) is adjustablely disposed at the outlet end of the seed metering tube assembly (310) so that the seed blocking plate (321) in the seed blocking assembly (320) can be adjusted to be relatively positioned relative to the outlet end of the seed metering tube assembly (310). A seed-pushing assembly (400) is placed in the housing (100) corresponding to the seed inlet (110), and at least a portion of the seed-pushing assembly (400) extends into the seed filling cavity. The seed-pushing assembly (400) is configured to reciprocate along the thickness direction of the housing (100).

2. The air-assisted precision seed metering device of claim 1, wherein, The seed blocking assembly (320) includes an adjusting rod (322), a first universal joint (323), a second universal joint (324), and an adjusting ring (325). The adjusting ring (325) is sleeved on the end of the seed metering tube assembly (310) away from the housing (100). The first end of the adjusting rod (322) is adjustablely disposed on the adjusting ring (325). The second universal joint (324) is connected to the second end of the adjusting rod (322) through the first universal joint (323). The seed blocking plate (321) is connected to the side of the second universal joint (324) away from the first universal joint (323) and can block part of the outlet end of the seed metering tube assembly (310).

3. The air-assisted precision seed metering device of claim 2, wherein, The seed blocking assembly (320) further includes a limiting rod (326), and the adjusting ring (325) is provided with an adjusting slot (3251). The adjusting slot (3251) extends circumferentially along the adjusting ring (325). The adjusting rod (322) is provided with an arc-shaped adjusting block (3221) in the middle. The arc-shaped adjusting block (3221) is disposed in the adjusting slot (3251) and is limited to the adjusting slot (3251) by the limiting rod (326).

4. The air-suction precision seed metering device according to claim 2, characterized in that, The seeding tube assembly (310) is provided with a limiting groove (3102) at one end away from the housing (100), and the inner peripheral wall of the adjusting ring (325) is provided with an adjusting protrusion (3252), which is engaged with the limiting groove (3102).

5. The air-plant precision seed metering device according to claim 1, wherein, The seed dispensing mechanism (300) also includes a seed blowing pipe (330), which is disposed in the housing (100) corresponding to the seed dispensing port and communicates with the auxiliary cavity.

6. The air-plant precision seed metering device according to claim 1, characterized in that, The seed pushing assembly (400) includes a seed pushing block (410), a seed pushing shaft (420), a return spring, a seed pushing cam (440), and a rotary motor. The housing (100) is provided with a mounting groove. The seed-pushing shaft (420) is inserted into the mounting groove, the seed-pushing block (410) is disposed at the first end of the seed-pushing shaft (420), the reset spring is sleeved in the middle of the seed-pushing shaft (420), and the two ends of the reset spring are respectively connected to the seed-pushing block (410) and the housing (100), the rotary motor is connected to the seed metering machine, and the seed-pushing cam (440) is drivenly connected to the output shaft of the rotary motor and is correspondingly disposed at the second end of the seed-pushing shaft (420).

7. The air-plant precision seed metering device according to claim 1, characterized in that, The seed pushing assembly (400) includes a seed pushing block (410), a seed pushing shaft (420), and a reciprocating motor, and the housing (100) is provided with a mounting groove; The seed-pushing shaft (420) is inserted into the mounting groove, the seed-pushing block (410) is disposed at the first end of the seed-pushing shaft (420), and the second end of the seed-pushing shaft (420) is connected to the output shaft of the reciprocating motor.

8. The air-plant precision seed metering device according to any one of claims 1 to 7, characterized in that, Along the circumference of the seed metering disc (200), a plurality of first seed-disturbing protrusions (202) and / or a plurality of second seed-disturbing protrusions (203) are provided at intervals on the seed metering disc (200). The plurality of first seed-disturbing protrusions (202) are all located near the center of the seed metering disc (200), and the plurality of second seed-disturbing protrusions (203) are all located near the edge of the seed metering disc (200).

9. The air-plant precision seed metering device according to any one of claims 1-7, characterized in that, The lower end of the housing (100) is provided with a seed cleaning port (130), which is connected to the seed filling cavity. An oscillation component (500) is adjustablely provided on the housing (100), which is located in the seed filling cavity and is correspondingly provided with the seed cleaning port (130).

10. The air-plant precision seed metering device according to any one of claims 1-7, characterized in that, The air-suction precision seed metering device also includes a scraper assembly (600), which is adjustablely disposed in the seed filling chamber. The scraper blade in the scraper assembly (600) is configured to scrape off excess seeds in the seed suction holes (201) so that the seeds adsorbed in each seed suction hole (201) are in a single-seed state.

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