Automatic seeder for multi-variety corn mixed seeding

Abstract

The present application relates to the field of agricultural seeding technology, specifically is a kind of automatic seeding machine of multi-species corn mixed seeding, including the frame that is towed in field by tractor, frame is arranged with four seeders that each ridge variety is different at equal intervals in front and back, and the pushing mechanism that is pushed by active scraping to push away redundant seed is arranged on seeder, and the remedial mechanism that prevents planting position from missing sowing, the present application adopts guiding assembly to repeatedly slightly move adjustment seed clamping plate clamping seed posture, realizes stable seed taking and prevents seed from falling and missing sowing, cooperate photoelectric sensor monitoring, synchronous motor fast rotation wave wheel, fastly complete wave wheel interval replacement, to thereby remedy the missing sowing caused by seed clamping plate not successfully taking seed, in addition, scraper can push down the redundant seed on seed clamping plate by active contact mode, and then realize precision stable seed taking, active seed cleaning and missing sowing fast compensation of grain by grain seeding operation, ensure that field emergence rate overall uniformity.

Description

Technical Field

[0001] This invention relates to the field of agricultural sowing technology, specifically an automatic planter for mixed sowing of multiple corn varieties. Background Technology

[0002] With the continuous improvement of agricultural mechanization, corn planting operations are gradually adopting automated seeders to achieve efficient and precise planting. Existing corn seeders are usually towed by self-propelled equipment such as tractors and can plant four rows at once. Each row can be planted with different varieties of corn to meet diverse planting needs. This planting method emphasizes precision planting, that is, only one corn seed is planted at each planting position to ensure uniform spacing between plants and improve germination rate and yield.

[0003] The core component of a seeder is the seed metering device, which accurately and orderly separates seeds from the seed box and places them into the seed furrow. Seed metering devices can be divided into various types according to their working principle, such as air suction type, spoon wheel type, and finger clamp type. Among them, the finger clamp type seed metering device directly clamps the seeds through the seed clamping plate and uses rotational motion to transport the seeds to the seeding point. It has the characteristics of simple structure and wide applicability, and is especially suitable for precision sowing of large seeds such as corn.

[0004] However, the existing finger-clamp seed metering device still has obvious shortcomings in operation. First, when the seeder travels at a high speed, the rotation speed of the seed metering device increases accordingly. This can cause the seeds picked up by the seed clamping plate to easily carry multiple seeds into the sowing area at once if excess seeds are not removed in time, resulting in double sowing of two or more seeds at once, which affects the uniformity of sowing.

[0005] Secondly, due to the differences in size and shape of different varieties of corn seeds, the clamping mechanism of the finger-clamp seed metering device is difficult to adaptively adjust the clamping area to maximize, resulting in the phenomenon that the seed clamping plate falls off before moving the seed to the planting area. Furthermore, since the existing finger-clamp seed metering device lacks an effective missed seed detection and compensation mechanism, when the seed metering device fails to successfully clamp the seed, it cannot be remedied in time, causing missed seeding problems and affecting the overall uniformity of seedling emergence rate in the field. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an automatic seeder for mixed planting of multiple varieties of corn, including a frame that is pulled by a tractor to move in the field, four seed metering devices that are equally spaced back and forth and can be used to plant four rows at a time, with each row having a different variety, and the seed metering devices are equipped with a pushing mechanism for actively scraping and pushing away excess seeds, and a remedial mechanism to prevent missed planting positions.

[0007] The seed metering device includes several seed clamps for pushing the seeds, and a pulsator that rotates synchronously with the seed clamps.

[0008] The driving mechanism includes a guide assembly for driving the seed clamp plate to make radial reciprocating micro-movements in the upper left of the seed meterer, and a scraper blade slidably disposed on the seed meterer for pushing away excess seeds from the seed clamp plate.

[0009] The remedial mechanism includes a photoelectric sensor fixedly mounted on the seed metering device and a synchronous motor fixedly mounted on the rear side of the seed metering device for driving the impeller.

[0010] The seed clamping plate rotates and pushes the seeds upward. The guide component drives the seed clamping plate to move radially slightly to adjust the clamping area. Then, the scraper actively pushes the excess seeds on the seed clamping plate downward. When the photoelectric sensor detects missed sowing, the synchronous motor quickly rotates the impeller, so that the seeded compartments on the impeller quickly replace the seedless compartments for sowing.

[0011] Furthermore, by leveraging real-time monitoring by photoelectric sensors and the coordinated action of synchronous motors and guiding components, precise and stable seed picking, active seed clearing, and rapid compensation for missed sowing are achieved through seed-by-seed sowing operations.

[0012] Preferably, the seed metering device further includes a housing fixedly connected to the frame, and a partition plate is fixedly installed on the inner side of the housing to divide it into front and rear chambers. A disc cover is rotatably arranged on the front side of the partition plate, and a number of support rods rotatably connected to the disc cover are arranged at equal intervals along its circumference. The outer side of the support rods is slidably connected to the corresponding seed clamping plate along its axial direction.

[0013] Preferably, the guide assembly includes a T-shaped rod rotatably disposed on the end face of the seed clamping plate, and a pulley rotatably disposed on the T-shaped rod that extends into the inner side of the housing and rolls.

[0014] Preferably, a pusher is fixedly installed on the upper left side of the inner side of the housing, and a helical spring is provided between the seed clamping plate and the support rod. The pusher intermittently pushes the seed clamping plate, and the helical spring resets the seed clamping plate, so that the seed clamping plate moves slightly to clamp the seed.

[0015] Preferably, a rearward-facing bristle block is fixedly installed on the housing. When the seed clamping plate rotates to the pusher position, the bristles of the bristle block block the seed clamping plate on the side facing the housing axis, preventing the seeds from falling off when the seed clamping plate moves slightly.

[0016] Preferably, the inner side of the housing is provided with two C-shaped strips arranged symmetrically front to back for limiting the pulleys. The opening position of the C-shaped strips corresponds to the pusher. The C-shaped strips prevent the seed clamping plate from moving slightly without protection by blocking the pulleys.

[0017] Preferably, the scraper blade is fixedly connected to a wedge plate via an L-shaped connecting strip, and a rearwardly arranged protruding column is fixedly provided on the outer side of the support rod.

[0018] Preferably, a push spring is provided between the L-shaped connecting strip and the partition. When the protruding column passes through the wedge plate, it compresses and stores the push spring, causing the push spring to drive the scraper to push the seeds on the seed clamping plate away from the corresponding support rod to fall off.

[0019] Preferably, a number of rubber triangular strips are fixedly installed on the front side of the scraper, and excess seeds are pushed down by the right-angled sides of the triangular strips.

[0020] Preferably, the impeller is coaxially and fixedly connected to the disc cover, the output shaft of the synchronous motor is fixedly connected to the impeller, and an arc-shaped groove connecting the two chambers is provided on the upper right part of the partition to allow seeds to enter the impeller compartment.

[0021] The beneficial effects of this invention are as follows: First, this invention uses a guide component to repeatedly and slightly adjust the seed clamping plate's posture to achieve stable seed removal and prevent seeds from falling off and being missed during sowing. Combined with photoelectric sensor monitoring and synchronous motor rapid rotation of the impeller, the impeller compartment is quickly replaced, thereby remedying missed sowing caused by the seed clamping plate's failure to successfully remove seeds. In addition, the scraper can actively contact and push down excess seeds on the seed clamping plate, thereby achieving precise and stable seed removal, active seed cleaning, and rapid compensation for missed sowing, ensuring the overall uniformity of seedling emergence rate in the field.

[0022] Second, the present invention uses a guide component to repeatedly and slightly adjust the position of the seed clamping plate, so that it can adjust the seed posture during the clamping process. At the same time, the bristles of the brush block block block the seeds to block and protect them, preventing the seeds from falling during the position adjustment process, so that the offset or sideways seeds can be straightened, thereby obtaining the maximum clamping area, ensuring that the seeds remain stable during transportation, and effectively preventing the phenomenon that the seed clamping plate falls off before moving the seeds to the seeding area.

[0023] Third, this invention employs a method where, during the rotation and transport of seeds by the seed clamping plate, a protruding column on the outer side of the support rod compresses and pushes the spring when it passes the wedge plate. This spring then drives the scraper to push excess seeds off the seed clamping plate that are far from the corresponding support rod, thereby actively and promptly cleaning up excess seeds and ensuring that only one seed is delivered to the seed furrow each time, thus guaranteeing the precise implementation of the seed-by-seed sowing operation mode.

[0024] Fourth, this invention uses photoelectric sensors to monitor the seeds in the impeller compartment in real time. When the seed metering device fails to pick up the seeds, leaving no seeds in the impeller compartment, the photoelectric sensor immediately feeds back a signal. The host computer then controls the synchronous motor to rotate the impeller rapidly, so that the compartment with seeds on the impeller quickly replaces the compartment without seeds. This achieves immediate response and compensation for missed sowing, thereby further ensuring the accuracy of seed-by-seed sowing. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a first structural schematic diagram of the present invention.

[0027] Figure 2 This is a schematic diagram of the second structure of the present invention.

[0028] Figure 3 This is a partial sectional view of the shell, partition, disc cover and support rod in this invention.

[0029] Figure 4 This is a schematic diagram of the structure of the shell, support rod, L-shaped connecting strip and wedge plate in this invention.

[0030] Figure 5 This is a partial cross-sectional view of the shell, partition, and bristle block in this invention.

[0031] Figure 6 This is a partial cross-sectional view of the partition, scraper, triangular strip, and seed clamping plate in this invention.

[0032] Figure 7 This is a partial sectional view of the shell, T-shaped rod, pulley and seed clamping plate in this invention.

[0033] Figure 8 This is a partial cross-sectional view of the housing, disc cover, impeller, and synchronous motor in this invention.

[0034] Figure 9 This is a partial cross-sectional view of the shell and partition in this invention.

[0035] In the diagram: 1. Frame; 2. Seed metering device; 3. Pushing mechanism; 4. Remedial mechanism; 21. Seed clamping plate; 22. Impeller; 23. Housing; 24. Partition plate; 25. Disc cover; 26. Support rod; 31. Guide assembly; 32. Scraper; 41. Photoelectric sensor; 42. Synchronous motor; 311. T-shaped rod; 312. Pulley; 313. Pushing component; 314. Brush block; 315. C-shaped strip; 321. L-shaped connecting strip; 322. Wedge plate; 323. Protruding column; 324. Triangular strip. Detailed Implementation

[0036] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0037] See Figure 1 , Figure 2 and Figure 4An automatic seeder for mixed planting of multiple varieties of corn includes a frame 1 that is pulled by a tractor to travel in the field. Four seed metering devices 2 are arranged at equal intervals on the frame 1, each planting four rows at a time, and each row has a different variety. The seed metering devices 2 are equipped with a pushing mechanism 3 for actively scraping and pushing away excess seeds, and a remedial mechanism 4 for preventing missed planting positions.

[0038] See Figure 1 , Figure 3 , Figure 4 , Figure 7 and Figure 8 The seed metering device 2 includes several seed clamping plates 21 for pushing seeds, and a pulsator 22 that rotates synchronously with the seed clamping plates 21. The seed metering device 2 also includes a housing 23 that is fixedly connected to the frame 1. A partition 24 that divides the housing 23 into two chambers is fixedly installed on the inner side of the housing 23. A disc cover 25 is rotatably arranged on the front side of the partition 24. Several support rods 26 that are rotatably connected to the disc cover 25 are arranged at equal intervals along its circumference. The outer side of the support rods 26 is slidably connected to the corresponding seed clamping plate 21 along its axial direction.

[0039] See Figure 4 , Figure 5 , Figure 6 and Figure 7 The pushing mechanism 3 includes a guide assembly 31 for driving the seed clamping plate 21 to move radially back and forth slightly inside the seed metering device 2 at the upper left. The guide assembly 31 includes a T-shaped rod 311 rotatably disposed on the end face of the seed clamping plate 21. A pulley 312 is rotatably disposed on the T-shaped rod 311 and rolls into the inner side of the housing 23. A pushing member 313 is fixedly installed on the upper left part of the inner side of the housing 23. A helical spring is disposed between the seed clamping plate 21 and the support rod 26. The pushing member 313 intermittently pushes the seed clamping plate 21 and resets the seed clamping plate 21 in conjunction with the helical spring, so that the seed clamping plate 21 moves slightly to clamp the seeds.

[0040] See Figure 3 , Figure 4 and Figure 6 A scraper 32 for pushing away excess seeds on the seed clamping plate 21 is slidably provided on the front side of the partition 24. The scraper 32 is fixedly connected to a wedge plate 322 by an L-shaped connecting strip 321. A rearwardly arranged protruding post 323 is fixedly provided on the outside of the support rod 26. A push spring is provided between the L-shaped connecting strip 321 and the partition 24. When the protruding post 323 passes the wedge plate 322, it compresses and stores the push spring, so that the push spring drives the scraper 32 to push the seeds on the seed clamping plate 21 away from the corresponding support rod 26 to fall off.

[0041] See Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 9The remedial mechanism 4 includes a photoelectric sensor 41 fixedly mounted on the housing 23, and a synchronous motor 42 fixedly mounted on the rear side of the housing 23 for driving the impeller 22. The impeller 22 is coaxially fixedly connected to the disc cover 25, and the output shaft of the synchronous motor 42 is fixedly connected to the impeller 22. The upper right part of the partition 24 has an arc-shaped groove connecting the two chambers to allow seeds to enter the impeller 22 compartment.

[0042] During sowing, the tractor pulls the frame 1 and moves in the field. At the same time, the synchronous motor 42 starts and controls the impeller 22 to rotate clockwise according to the speed of the tractor. The impeller 22 drives the seed clamping plate 21 to rotate synchronously inside the housing 23 through the disc cover 25 and the support rod 26 on it. When the seed clamping plate 21 rotates from bottom to top, it clamps the seeds that have fallen into the seed box into the housing 23 and into the front of the partition 24, and moves upward as the seed clamping plate 21 rotates.

[0043] Subsequently, the seed clamping plate 21 moves the clamped seed to the position of the corresponding pusher 313, so that the seed clamping plate 21 drives the pulley 312 to move to contact the pusher 313 via the T-shaped rod 311. This causes the pusher 313 to push the pulley 312 in a direction closer to the axis of the housing 23, which in turn causes the pulley 312 to drive the seed clamping plate 21 to move slightly via the T-shaped rod 311, so as to adjust the area of ​​the seed clamping plate.

[0044] In this embodiment, as Figure 7 As shown, the pusher 313 is composed of an arc-shaped plate structure and several triangular plate structures. When the pulley 312 rotates, the pulley 312 moves along the hypotenuse of the triangular plate structure, causing the triangular plate structure to push the pulley 312 towards the axis of the housing 23. When the pulley 312 drives the seed clamping plate 21 to move through the T-shaped rod 311, it compresses the corresponding helical spring. When the pulley 312 moves away from the triangular plate structure, the helical spring quickly pushes the seed clamping plate 21 back to its original position through its own elasticity. Through this slow push and quick reset method, some corn seeds standing on the side of the seed clamping plate 21 can swing, so that the largest area of ​​the corn seeds contacts the seed clamping plate 21, allowing the seed clamping plate 21 to smoothly clamp and move the corn seeds.

[0045] It should be emphasized that the seed clamping plate 21 in the existing seed metering device 2 can rotate slightly when it rotates to clamp the corn seed, so that the seed clamping plate 21 moves away from the partition 24 and opens slightly to facilitate the clamping of the seed. Then, the seed clamping plate 21 automatically reverses so that the seed clamping plate 21 pushes the seed against the partition 24 to stabilize the seed. In this embodiment, the rotation function and structural design of the seed clamping plate 21 in the existing seed metering device 2 are still adopted, and the specific structure is not shown in the attached drawings.

[0046] When the seed clamping plate 21 rotates away from the position of the corresponding pusher 313, the cylindrical surface of the protruding column 323 on the T-shaped rod 311 contacts the wedge surface of the wedge plate 322, so that the protruding column 323 pushes the wedge plate 322, and then drives the scraper 32 to move away from the axis of the housing 23 through the L-shaped connecting strip 321. The L-shaped connecting strip 321 compresses the push spring to store force. When the side of the seed clamping plate 21 away from the corresponding support rod 26 rotates to the position of the scraper 32, the support rod 26 drives the protruding column 323 to rotate away from the wedge plate 322, so that the wedge plate 322 is no longer blocked. The push spring releases its elastic force to push the L-shaped connecting strip 321 to drive the scraper 32 to quickly reset and move, so that the scraper 32 actively pushes the excess corn seeds on the seed clamping plate 21 to fall off.

[0047] It should be understood that the seed clamping plate 21 in this embodiment has the same shape and structure as that in the prior art. Thus, by actively contacting and pushing away the seeds through the scraper blade 32, the problem of incomplete seed removal in the prior art, which relies solely on the vibration of the seeder during its movement and the weight of the excess seeds falling off, is solved. Through the pushing action during active contact, the excess seeds stuck on the seed clamping plate 21 can be accurately removed, effectively solving the problem of reseeding. In addition, the wedge plate 322 is not on the rotation trajectory of the seed clamping plate 21, so the only remaining seed on the seed clamping plate 21 can pass smoothly through the scraper blade 32.

[0048] It should be emphasized that the rear end face of the protruding column 323 is designed with an arc shape, so that when the support rod 26 rotates, the protruding column 323 will not hinder the rotation of the support rod 26. When the protruding column 323 contacts the wedge-shaped surface of the wedge plate 322, the protruding column 323 is arranged in a longitudinal rearward position, so that the protruding column 323 can stably push the wedge plate 322 and ensure the storage of the push spring.

[0049] When the seed clamping plate 21 rotates the seeds to the arc-shaped groove position of the partition plate 24, since the impeller 22 rotates at the same speed as the seed clamping plate 21, and the interval between the two adjacent plates of the impeller 22 corresponds to the corresponding seed clamping plate 21, the partition position of the impeller 22 also rotates to the arc-shaped groove position, causing the seeds to move backward under the push of the seed clamping plate 21 and fall into the partition of the impeller 22, and move downward with the impeller 22.

[0050] When the seeds rotate with the impeller 22 to the lower side of the axis of the housing 23, they slide down the feed plate of the impeller 22 under the action of gravity to the inner side of the housing 23. This allows the seeds to rotate with the impeller 22 to the probe position of the photoelectric sensor 41. When the photoelectric sensor 41 is blocked by the seeds, the synchronous motor 42 continues to rotate normally. When the photoelectric sensor 41 is not blocked by the seeds, it immediately feeds back a signal. The host computer controls the synchronous motor 42 to rotate the impeller 22 quickly and instantaneously, so that the adjacent compartments with seeds on the impeller 22 quickly replace the compartments without seeds, realizing an immediate response and compensation for missed sowing. Then, the seeds rotate with the impeller 22 to the lower part and fall into the seed furrow on the ridge under the action of gravity through the feed port on the housing 23, completing the sowing one seed at a time. Moreover, through the four seed metering devices 2 arranged in front and behind, different varieties of corn seeds can be sown on four ridges at the same time.

[0051] It should be emphasized that the photoelectric sensor 41 consists of a light emitter fixedly installed on the rear side of the housing 23 and a light sensor fixedly installed on both the housing 23 and the partition 24. The impeller 22 is made of a light-transmitting material. During operation, the light emitted by the light emitter is continuously received by the light sensor, thereby determining that the photoelectric sensor 41 has detected a seed. The host computer updates the detection interval of the photoelectric sensor 41 through the rotation speed of the synchronous motor 42, thereby monitoring the seeds in each compartment of the impeller 22 in real time.

[0052] It is worth noting that the photoelectric sensor 41 is located near the inner side of the housing 23, ensuring that all seeds moving along the inner side of the housing 23 can be detected by the photoelectric sensor 41. Especially during high-speed sowing, the rapidly rotating impeller 22 can fling the seeds onto the inner side of the housing 23, further ensuring the monitoring accuracy of the photoelectric sensor 41. Furthermore, the speed at which the synchronous motor 42 controls the impeller 22 to instantly and rapidly compensate for missed sowing is determined through repeated experiments by those skilled in the art and is adapted to the normal rotation speed of the impeller 22. In addition, in this embodiment, the photoelectric sensor 41 can also be used to... The light emitter end and the light sensor end of sensor 41 are made of transparent and wear-resistant material such as wear-resistant glass. Cleaning brushes are installed on the front and rear sides of the impeller 22 plate. The rotation of impeller 22 cleans photoelectric sensor 41 to ensure the monitoring accuracy of photoelectric sensor 41. At the same time, according to the rotation speed of impeller 22, the upper computer controls the monitoring interval of photoelectric sensor 41 so that when the interval position of impeller 22 corresponds to photoelectric sensor 41, photoelectric sensor 41 is activated to monitor. When the cleaning brush on impeller 22 cleans photoelectric sensor 41, photoelectric sensor 41 is turned off to prevent monitoring errors.

[0053] In this embodiment, the lower part of the frame 1 is also equipped with an existing furrow opener, a soil covering device, and a ground wheel. The furrow opener is located below each seed metering device 2 and can cut a V-shaped or U-shaped groove on the ridge, so that the seed metering device 2 can guide the seeds into the soil. The soil covering device is located behind the furrow opener and is used to push back the soil turned up during furrow opening and cover the seeds. The ground wheel supports the frame 1 and allows it to move on the ridge. The above are all common technical designs in the prior art, which will not be described in detail here, and are not shown in the accompanying drawings.

[0054] To prevent seeds from falling out when the micro-moving seed clamping plate 21 adjusts the seed clamping area, the present invention designs the following structure: (See attached diagram) Figure 4 and Figure 5 A rearward-facing bristle block 314 is fixedly installed on the housing 23. When the seed clamping plate 21 rotates to the position of the pusher 313, the bristles of the bristle block 314 block the side of the seed clamping plate 21 facing the axis of the housing 23, preventing the seeds from falling off when the seed clamping plate 21 moves slightly.

[0055] See Figure 5 and Figure 7 Two C-shaped strips 315 are fixedly provided on the inner side of the housing 23, which are symmetrically arranged front and back and used to limit the pulley 312. The opening position of the C-shaped strips 315 corresponds to the pusher 313, so that the C-shaped strips 315 prevent the seed clamping plate 21 from moving slightly without the protection of the brush block 314, thus preventing the seeds from falling off.

[0056] To enhance the pushing effect of the scraper blade 32 on the seeds while preventing the seeds from being scratched or damaged, the present invention has designed the following structure: (See attached diagram) Figure 6 Several rubber triangular strips 324 are fixedly installed on the front side of the scraper 32. When the scraper 32 moves upward, it makes smooth and flexible contact with the seeds through the inclined surface of the triangular strips 324 with a small area. When the scraper 32 moves downward, it pushes the excess seeds directly downward through the right angle side of the triangular strips 324 to fall off.

[0057] This invention achieves precise and stable seed collection, active seed removal, and rapid compensation for missed seeds by a pusher 313 driving the seed clamping plate 21 to move radially slightly after rotation to adjust its state and stably hold the seeds. Simultaneously, the brush block 314 blocks the seeds from one side during the slight movement to prevent them from falling. Then, the rubber triangular strip 324 on the scraper blade 32 is actively driven by the energy-storing push spring of the protruding column 323 and the wedge plate 322 to flexibly and thoroughly push away excess seeds from the seed clamping plate 21. Finally, the seeds fall into the compartment of the impeller 22 and are transferred to the monitoring position of the photoelectric sensor 41. Once a missed seed is detected, the synchronous motor 42 is controlled to rotate the impeller 22 rapidly and instantly, so that the compartment with seeds is quickly filled. This achieves precise and stable seed collection, active seed removal, and rapid compensation for missed seeds, ensuring the overall uniformity of the seedling emergence rate in the field.

[0058] Although this invention adds a seed clamping plate 21 micro-movement system and supplements it with brush blocks 314 for side protection on the basis of the existing seeder structure, and also sets up an active seed cleaning mechanism with a scraper blade 32 with rubber triangular strips 324, and introduces a rapid compensation system for missed sowing composed of photoelectric sensor 41 and synchronous motor 42, these improvements do introduce a certain degree of structural complexity. However, it is through the synergistic effect of these structures that the system achieves precise and stable clamping of corn seeds, active and reliable removal of excess seeds, and instantaneous detection and compensation for missed sowing. It effectively solves the problems of unstable seed clamping, incomplete seed cleaning, and inability to remedy missed sowing in the existing technology, and significantly improves the accuracy and reliability of single-seed sowing. As a result, it greatly ensures the uniformity of seedling emergence in the field. The resulting improvement in sowing effect and economic benefits far outweighs the cost incurred due to the moderate increase in structure.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic seeder for mixed planting of multiple corn varieties, comprising a frame towed by a tractor and moving across the field, wherein four seed metering devices are arranged at equal intervals front and back on the frame, characterized in that, The seed metering device is equipped with a pushing mechanism that actively scrapes away excess seeds, as well as a remedial mechanism to prevent missed planting positions. The seed metering device includes several seed clamping plates for pushing the seeds, and a pulsator that rotates synchronously with the seed clamping plates; The pushing mechanism includes a guide assembly for driving the seed clamp plate to make radial reciprocating micro-movements in the upper left of the seed meterer, and a scraper plate that is slidably disposed on the seed meterer and used to push away excess seeds on the seed clamp plate. The remedial mechanism includes a photoelectric sensor fixedly mounted on the seed metering device, and a synchronous motor fixedly mounted on the rear side of the seed metering device for driving the impeller; The seed clamping plate rotates and pushes the seeds upward. The guide component drives the seed clamping plate to move radially slightly to adjust the clamping area. Then, the scraper actively pushes the excess seeds on the seed clamping plate downward. When the photoelectric sensor detects missed sowing, the synchronous motor quickly rotates the impeller, so that the seeded compartments on the impeller can be quickly replaced with seedless compartments for sowing. Furthermore, by leveraging real-time monitoring by photoelectric sensors and the coordinated action of synchronous motors and guiding components, precise and stable seed picking, active seed clearing, and rapid compensation for missed seeding are achieved through seed-by-seed sowing operations. The guide assembly includes a T-shaped rod rotatably disposed on the end face of the seed clamping plate, and a pulley that extends into the inner side of the housing and rolls on the T-shaped rod. A pusher is fixedly installed on the upper left side of the inner side of the housing. A helical spring is provided between the seed clamping plate and the support rod. The pusher intermittently pushes the seed clamping plate and works with the helical spring to reset the seed clamping plate, so that the seed clamping plate moves slightly to clamp the seed.

2. The automatic seeder for mixed planting of multiple corn varieties according to claim 1, characterized in that, The seed metering device also includes a housing fixedly connected to the frame. A partition is fixedly installed on the inner side of the housing, dividing it into two chambers, front and rear. A disc cover is rotatably mounted on the front side of the partition. Several support rods are rotatably connected to the disc cover at equal intervals along its circumference. The outer side of the support rods is slidably connected to the corresponding seed clamping plate along its axial direction.

3. The automatic seeder for mixed planting of multiple corn varieties according to claim 2, characterized in that, A rearward-facing bristle block is fixedly installed on the shell. When the seed clamping plate rotates to the pusher position, the bristles of the bristle block block the seed clamping plate on the side facing the shell axis, preventing the seeds from falling off when the seed clamping plate moves slightly.

4. An automatic seeder for mixed planting of multiple corn varieties according to claim 2, characterized in that, The inner side of the housing is provided with two C-shaped strips arranged symmetrically front and back for limiting pulleys. The opening position of the C-shaped strips corresponds to the pusher. The C-shaped strips prevent the seed clamping plate from moving slightly without protection by blocking the pulleys.

5. An automatic seeder for mixed planting of multiple corn varieties according to claim 2, characterized in that, The scraper blade is fixedly connected to a wedge plate via an L-shaped connecting strip, and a rearward-facing protruding column is fixedly installed on the outside of the support rod.

6. An automatic seeder for mixed planting of multiple corn varieties according to claim 5, characterized in that, A push spring is provided between the L-shaped connecting strip and the partition. When the protruding column passes the wedge plate, it compresses and stores the force to push the spring, which in turn drives the scraper to push the seeds on the seed clamping plate away from the corresponding support rod to fall off.

7. An automatic seeder for mixed planting of multiple corn varieties according to claim 5, characterized in that, Several rubber triangular strips are fixedly installed on the front side of the scraper blade. Excess seeds are pushed down by the right-angled sides of the triangular strips.

8. An automatic seeder for mixed planting of multiple corn varieties according to claim 2, characterized in that, The impeller is coaxially and fixedly connected to the disc cover, and the output shaft of the synchronous motor is fixedly connected to the impeller. An arc-shaped groove connecting the two chambers is opened on the upper right part of the partition to allow seeds to enter the impeller compartment.

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