Air suction seed sowing device for plot breeding

Abstract

The utility model relates to the technical field of seeding, in particular to an air suction seed sowing device for plot breeding. The seed-metering device comprises a rear plate, a wheel groove is formed in the front end of the rear plate, a seed-metering disc is rotatably arranged in the wheel groove, the rear end of the seed-metering disc is rotatably and hermetically connected with the rear plate, a plurality of groups of adsorption holes are uniformly distributed in the upper circumference of the seed-metering disc, and a front plate is mounted on the front side of the rear plate. The whole seed bin is wedge-shaped, the rear end of the seed bin is open and is in sliding contact with the front end of the seed metering disc, and the front side of the seed bin can be opened and allows redundant seeds in the seed bin to be discharged. According to the utility model, the problem of frequent miss-seeding of a small amount of test seeds in the plot breeding process can be effectively solved, seed cleaning and seed changing are not mutually influenced, the seeding precision is improved, and passages between adjacent small fields are neat.

Description

Technical Field

[0001] The utility model relates to the technical field of sowing, in particular to an air suction seeding device for plot breeding. Background Art

[0002] The existing seeding machine has a long sowing distance, is not easy to change varieties quickly, has a low controllability, and cannot meet the functions required by current breeding. Manual sowing is labor-intensive and inefficient, which seriously affects the breeding process and work efficiency.

[0003] Plot sowing is different from field production. It is a small-area sowing that is reasonably arranged after experimental design. The seeder that meets this kind of small-area sowing is called a plot seeder. The plot seeder belongs to field test machinery. In agricultural scientific research activities, the field test process is often encountered, such as various field comparison tests, variety comparison and yield identification. In particular, scientific researchers engaged in the cultivation of new crop varieties often need to conduct modular field management, observation and recording of experimental plots according to different types.

[0004] The area of ​​the plot is generally between 5 and 30 square meters, with a 50-100 cm walkway between the plots. The width of the plot is selected based on the cutting width of the plot combine harvester and the local test requirements. The length-to-width ratio of the long strip plot is usually 2:1-5:1. The length of the plot is generally around 3-10 meters, and the longest will not exceed 20 meters.

[0005] Since the scheme of each test is different, the number of basic seedlings in each plot varies according to the test requirements, and the number of seeds used in each plot is inconsistent. This is determined by the test scheme. In the case of unpredictable sowing amount in each plot, it is necessary to sow the prepared specified number of seeds completely and evenly in the corresponding plot during sowing, and the seeds cannot be sown in adjacent plots. This is the basic requirement for sowing in plots. According to such requirements, the sowing machines used in ordinary production cannot meet the basic technical requirements for sowing in the above plots. The number of plots in a scientific research unit each year ranges from four to five hundred to several thousand.

[0006] In the absence of a plot seeder, the only way is to manually dig trenches, divide the plots, manually sow a certain amount of seeds in the sowing trenches, and then manually cover the soil. This requires a lot of labor, is prone to artificial mis-seeding, and has poor sowing quality, which directly affects the accuracy of the test.

[0007] Plot sowing has specific technical requirements for the seeder. First, the quantitative sowing material should be sown evenly and completely into the determined row length of the plot, that is, to ensure quantitative sowing. Second, seeds of different strains cannot remain in the seed box and the seed meter to avoid seed mixing, which is called zero mixing. Third, seeds cannot be missed when sowing in the plot. Fourth, the seeder must maintain continuous sowing when working, and there should be no pause for clearing and changing seeds between plots, so that it will be of practical significance. Non-stop clearing and changing seeds means that the seed disc of the seeder must be in a rotating state, and there should be no short-term stop to complete the seed clearing and changing operations.

[0008] The existing negative pressure seeding devices have a relatively simple structure and all adopt a specific negative pressure zone. After leaving the negative pressure zone, the seeds fall into the field, resulting in poor adaptability of the seeding speed of the seeding device and limiting the speed of high-speed seeding operations. Especially when the reserved intervals between plots are narrow, the aisles cannot be accurately separated, and it is impossible to quickly replace seeds across plots, quickly prepare seeds, and accurately seed.

[0009] The patent document with application number 2017206682910 and invention name "Double-seed chamber precision seed meter for crop breeding test" discloses a double-seed chamber precision seed meter that can ensure that when the amount of seeds is small, there is no leakage during the sowing operation of the crop breeding test, and the filling and clearing of seeds do not affect each other. In this seed meter, the seeder moves forward, and the chain drives the sprocket connected to the seeding shaft through the key on the outside of the negative pressure shell to rotate, and then the seeding shaft drives the seeding disk fixing plate to rotate, so that the seeding disk and the stirring disk fixedly connected thereto rotate. The sowing distance of the seed meter is determined by the spacing between adjacent through holes on the seeding disk. However, in the actual breeding test process, in order to obtain the best spacing suitable for the growth of crops, the seeds in multiple small fields need to maintain different sowing spacings. After the crops are harvested, the yields of the small fields are compared to obtain the appropriate spacing suitable for crop production. It is not convenient for this seed meter to adjust the sowing distance. The seeding device, under the negative pressure in the negative pressure guide ring, makes it easier for the seeds to be adsorbed on the through holes of the seeding disc. When the seeds reach the bottom of the seeding shell along the seed transport cavity as the seeding disc rotates, the seeds on the seeding disc fall along the bottom outlet due to the absence of the pressure of the negative pressure guide ring at the bottom, and the sowing operation begins. The seeding device needs to connect the negative pressure fan to the air pipe connecting pipe on the negative pressure shell through the air duct to provide negative pressure for seeding. Negative pressure is required in the process of seeding, so the fan not only needs to provide negative pressure for the pressure shell, but also needs to provide negative pressure for the negative pressure guide ring, and the power requirement of the fan is relatively high.

[0010] Under the negative pressure in the negative pressure guide ring, the seeding device makes it easier for the seeds to be adsorbed on the through holes of the seeding disc. When the seeds reach the bottom of the seeding housing along the seeding cavity as the seeding disc rotates, the seeds on the seeding disc fall along the bottom outlet due to the absence of the pressure of the negative pressure guide ring at the bottom, and the sowing operation begins. The starting end of the seeding cavity of the seeding device is connected to the seed filling cavity, and the end of the seeding cavity is connected to the seed discharge outlet. At the same time, in the prior art, the seeding disc needs to rotate for half a circle or more before discharging the seeds. Therefore, it takes a long time for the seeds to be adsorbed and moved to be discharged from the seed discharge outlet. When sowing in a small field, the sowing distance is long.

[0011] When multiple fields are sown continuously, in order to improve sowing efficiency, seeds will be automatically changed. That is, after sowing in one field, seeds will be automatically cleared and filled. For example, there are adjacent fields No. 1 and No. 2. When sowing, after sowing in field No. 1, in order to reduce the sowing distance of field No. 2, it is necessary to complete the seed change operation when the seed meter passes through the interval between field No. 1 and field No. 2.

[0012] At the end of the sowing of the small field, seeds can only be cleared, changed, and prepared after the last seeding is completed. Otherwise, it is easy to cause missed sowing. In this case, the seeds sucked out from the seed filling chamber are required to be discharged from the bottom of the seeding shell through the seeding disc. When using this seeder, if the interval between the No. 1 field and the No. 2 field is designed to be small, and the sowing start distance of the No. 2 field is large, the seeder in the No. 1 field needs to complete the sowing of the No. 1 field while clearing, changing, and preparing seeds. Under this condition, the seeding disc is required to be in a rotating state at all times.

[0013] In order to complete seed cleaning and seed replacement, the seeds of field No. 1 need to be quickly discharged and collected from the seed filling chamber through the seed cleaning tube, and then the seeds of field No. 2 need to be transported to the seed filling chamber from the external seed storage device after a certain period of time. After the seeds needed for field No. 1 are adsorbed to the seeding disc for the last time, seed cleaning should be completed within one sowing interval. At the specified time point, seed replacement begins, and the seed replacement time should also be controlled within one sowing interval. Seed cleaning and seed replacement cannot be carried out at the same time. To ensure that the seeds of field No. 1 are completely cleared and to prevent the seeds of field No. 2 from being discharged along with the seed cleaning, at least one sowing interval needs to be added between the seed cleaning and seed replacement processes. In addition, it is also required that seed replacement must be within one sowing interval. The single sowing interval should be coordinated with the tractor speed to control the sowing spacing. The single sowing interval should also not be controlled too short.

[0014] Seed replacement and seed preparation cannot be performed simultaneously to avoid seed mixing and seed preparation incompleteness. In order to shorten the time of seed replacement and seed preparation, the existing technology adopts the design of seed filling cavity, which reduces the time for seeds to fall from the seed storage device into the seed filling cavity, and also meets the requirements of fast switching to avoid seed mixing.

[0015] In addition, the above scheme requires negative pressure suction when cleaning seeds, which increases energy consumption. The above scheme is carried out while the seed meter continues to move forward with the tractor, resulting in multiple working steps, complex structure, high failure rate, high energy consumption, and difficulty in controlling precise sowing. It still cannot meet the requirements of short field spacing and high sowing accuracy.

[0016] In this solution, the seeding disc is always running before the seeding is completed, so the seeds of the next field entering the seed filling chamber will also be sucked and driven by the seeding disc. The seeds of the next field cannot meet the narrow aisle design and be accurately sown in a short time. Under conventional technical conditions, higher requirements are put forward for rapid seed cleaning, seed replacement, and seed preparation.

[0017] In addition, during the seed disc's rotation, the seeds fall into the seed filling bin during the seed change process. The seeds fall and hit the seed filling bin, or the rotating seed disc drives the seeds to move, so that the seed disc cannot guarantee that it can absorb the seeds in motion, so that the first sowing position of the No. 2 field cannot be guaranteed. At the same time, because the rotation speed of the seed disc is related to the tractor's travel speed, there are errors in the tractor's travel speed control, and the distance the tractor travels in the field is not ideal and flat. The influence of the rotation angle of the seed disc makes the seed disc unable to rotate according to the ideal state to meet the correspondence between the ideal sowing position and the through hole on the seed disc.

[0018] Finally, during the movement of the seeding device, it is required to always keep the position of the plot corresponding to meet the requirements of precise sowing, so that the forward distance of the seeding device and the rotation speed of the seeding disc are required to be unified and coordinated. In the prior art, the sowing time is long, and the seed preparation and replacement time is long. In the case of small fields with short intervals, if the rotation of the seeding disc is stopped at will, it is easy to cause the forward distance of the seeding device and the rotation position of the seeding disc to be inconsistent, which leads to the problem of inaccurate sowing and uneven field aisles. Summary of the invention

[0019] The technical problem to be solved by the utility model is to provide a plot breeding air suction seeding device which has a simple structure, high sowing accuracy, can reduce the sowing distance, and is convenient for clearing seeds after sowing.

[0020] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0021] The hopper is provided with a plurality of suction holes, the suction holes are arranged on the hopper and the suction holes are arranged on the hopper, and the suction holes are arranged on the hopper to prevent the suction holes from leaking out.

[0022] Specifically, the seed bin includes two side baffles symmetrically arranged on the left and right, the upper ends of the side baffles are fixedly connected to the lower end of the seed inlet tube, seed discharge plates are arranged on the front sides of the baffles on both sides, the seed discharge plates are in contact with the front ends of the side baffles, a rotating shaft is fixed on the upper ends of the seed discharge plates, the rotating shaft is rotatably connected to the bracket, the bracket is fixed on the front plate, the seed inlet tube is fixedly connected to the bracket, and a driving mechanism for driving the seed discharge plates to rotate around the rotating shaft is arranged at the front end of the seed inlet tube.

[0023] Specifically, the driving mechanism includes an electromagnetic push rod fixed at the front end of the seed feeding tube, a pin is rotatably connected to the telescopic rod of the electromagnetic push rod, a support rod is fixed at the front end of the seed row piece, a long slot is opened on the support rod, and the pin passes through the long slot.

[0024] Specifically, a guide piece is arranged in the inlet hole, the upper end of the guide piece is inclined toward a side away from the seed placement channel, the lower end of the guide piece is fixedly connected to the front plate, and the guide piece is in sliding contact with the seed placement disc.

[0025] Specifically, a seed placement tube connected to the seed placement channel is fixed at the lower end of the front plate.

[0026] Specifically, the seed disc is driven by a servo motor.

[0027] Specifically, the air duct is connected to the exhaust fan.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] 1. The utility model can effectively solve the problem of missed sowing of a small amount of test seeds that often occurs during the breeding process in a plot. Seed cleaning and seed replacement do not affect each other, sowing accuracy is improved, and the aisles between adjacent small fields are neat.

[0030] 2. The utility model reduces the length of the arc groove, so that the seeding operation can be achieved in one time when the seeding disc rotates at a smaller angle, which can shorten the seeding time. Since the seeding time is greatly shortened, more sufficient time is reserved for seed replacement and seed preparation, so the sowing distance can be reduced. When multiple small fields are sown continuously, the sowing distance and the interval distance between two adjacent small fields can be reduced.

[0031] 3. By setting up a separate seed bin, when a small amount of seeds are put into the seed bin, the seed bin can gather the small amount of seeds and make the seeds in the seed bin close to the adsorption holes of the seed bin, so that the adsorption holes of the seed bin can effectively and quickly adsorb the seeds in the seed bin, preventing the occurrence of holes during the sowing process.

[0032] 4. The seed bin is equipped with an openable seed-discharging piece. When it is necessary to clear the seeds, the electromagnetic push rod can be started to open the seed-discharging piece. After the seed-discharging piece is opened, the seeds in the seed bin can be quickly and completely discharged, which can reduce the seed change time and facilitate the seed cleaning operation. In the process of continuous sowing of multiple seeds, it can avoid the mixing of seeds of different varieties.

[0033] 5. No negative pressure is required during seed cleaning, which can reduce energy consumption.

[0034] 6. The servo motor drives the seed disc to rotate. Under the premise of ensuring that the overall travel speed of the seeder remains unchanged, the seeding spacing can be changed by changing the rotation speed of the seed disc through the servo motor, which has a wide range of applications.

[0035] 7. This seed meter has high sowing accuracy, short seed changing time and short sowing distance, so it can reduce the distance between adjacent small fields and make full use of the experimental fields.

[0036] 8. Sow seeds in a quantitative manner according to the sowing amount required by the test within the specified area, and have self-cleaning capabilities without stopping the machine to prevent mixing of varieties between plots. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a front view of the utility model.

[0038] Figure 2 It is the right view of the connection structure between the seed row piece and the support rod.

[0039] Figure 3 This is the right side view of the front panel.

[0040] Figure 4 This is the rear view of the front panel.

[0041] Figure 5 It is a schematic diagram of the cooperation between the seed disc and the rear plate.

[0042] The names of the parts in the attached drawings are:

[0043] 1. Rear plate; 2. Seed plate; 3. Adsorption hole; 4. Front plate; 5. Seed tube; 6. Bracket; 7. Seed inlet tube; 8. Side baffle; 9. Seed plate; 10. Rotating shaft; 11. Electromagnetic push rod; 12. Support rod; 13. Long slot; 14. Inlet hole; 15. Guide plate; 16. Seed channel; 17. Arc slot; 18. Air duct. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0045] Reference Figure 1-Figure 5 As shown, a plot breeding air suction seeding device includes a rear plate 1, a wheel groove is opened at the front end of the rear plate 1, a seeding disk 2 is rotatably arranged in the wheel groove, the seeding disk 2 is driven by a servo motor, the rear end of the seeding disk 2 is rotatably sealed and connected to the rear plate 1, and a plurality of groups of adsorption holes 3 are evenly distributed on the circumference of the seeding disk 2.

[0046] The front plate 4 is installed on the front side of the rear plate 1. A seed inlet tube 7 is fixed to the right end of the front plate 4, and a seed bin connected to the seed inlet tube 7 is provided at the lower end thereof. The seed bin is wedge-shaped as a whole, and the rear end of the seed bin is open, and the rear end of the seed bin is in sliding contact with the front end of the seeding disk 2, and the front side of the seed bin can be opened to allow the excess seeds in the seed bin to be discharged. The seed bin includes two side baffles 8 symmetrically arranged on the left and right, and the upper ends of the side baffles 8 are fixedly connected to the lower end of the seed inlet tube 7, and seeding sheets 9 are provided on the front sides of the baffles 8 on both sides, and the seeding sheets 9 are in contact with the front ends of the side baffles 8, and a rotating shaft 10 is fixed to the upper end of the seeding sheets 9, and the rotating shaft 10 is rotatably connected to the bracket 6, and the bracket 6 is fixed on the front plate 4, and the seed inlet tube 7 is fixedly connected to the bracket 6, and a driving mechanism for driving the seeding sheets 9 to rotate around the rotating shaft 10 is provided at the front end of the seed inlet tube 7.

[0047] The driving mechanism includes an electromagnetic push rod 11 fixed to the front end of the seed feeding tube 7, a pin is rotatably connected to the telescopic rod of the electromagnetic push rod 11, a support rod 12 is fixed to the front end of the seed discharging piece 9, a long slot 13 is opened on the support rod 12, and the pin passes through the long slot 13.

[0048] A vertical seeding channel 16 is provided at the rear end of the front plate 4, and a seeding tube 5 connected to the seeding channel 16 is fixed at the lower end of the front plate 4. Figure 1 In the direction shown, the seed placement channel 16 is located on the right side of the rotation axis of the seed placement disc 2, and an inlet hole 14 is provided on the upper end of the seed placement channel 16 facing the seed placement tube 7. A guide piece 15 is provided in the inlet hole 14, and the upper end of the guide piece 15 is inclined toward the side away from the seed placement channel 16, and the lower end of the guide piece 15 is fixedly connected to the front plate 4, and the guide piece 15 is in sliding contact with the seed placement disc 2.

[0049] An arc-shaped groove 17 is provided on the rear plate 1 on the rear side of the seed disc 2, the lower end of the arc-shaped groove 17 corresponds to the seed bin, and the upper end of the arc-shaped groove 17 corresponds to the upper end of the seed placement channel 16. An air duct 18 connected to the arc-shaped groove 17 is fixed on the rear plate 1, and the air duct 18 is connected to the exhaust fan. The adsorption holes 3 correspond to the arc-shaped groove 17 along the movement trajectory of the seed disc 2.

[0050] When plot breeding is required, a small amount of test seeds is put into the seed bin through the seed inlet pipe 7, and the seed bin can gather the small amount of test seeds. Then start the exhaust fan, and negative pressure will be generated in the arc groove 17 after the exhaust fan is started. During the sowing process, the servo motor is driven, and the servo motor drives the seed disc 2 to rotate. When the adsorption hole 3 moves to the rear side of the seed bin, the adsorption hole 3 is connected to the lower end of the arc groove 17. The outside air flows through the adsorption hole 3, the arc groove 17, the air duct 18 and the exhaust fan in turn. At this time, the adsorption hole 3 can adsorb the seeds in the seed bin, and the adsorbed seeds will rotate with the seed disc 2.

[0051] When the seeds adsorbed by the adsorption holes 3 enter the seeding channel 16 through the inlet holes 14, the adsorption holes 3 are misaligned with the upper ends of the arc grooves 17, and the adsorption holes 3 lose their adsorption effect on the seeds. The seeds will fall along the seeding channel 16 under the action of gravity and be discharged into the ridges of the land through the seeding tubes 5.

[0052] By reducing the length of the arc groove 17, the seeding operation can be achieved when the seeding disc 2 rotates at a smaller angle, thereby reducing the sowing distance. By setting a separate seed bin, when a small amount of seeds are put into the seed bin, the seed bin can gather the small amount of seeds and make the seeds in the seed bin close to the adsorption holes 3 passing through the rear side of the seed bin, so that the adsorption holes 3 passing through the seed bin can effectively and quickly adsorb the seeds in the seed bin, thereby preventing the occurrence of holes during the sowing process.

[0053] After the seeds sown for the last time in the plot are adsorbed by the adsorption holes 3, the seeds are cleared. Since the seed bin is provided with an openable seeding piece 9, when it is necessary to clear the seeds, the electromagnetic push rod 11 can be activated to make the seeding piece 9 rotate around the rotating shaft 10 and then open the seed bin. After the seeding piece 9 is opened, all the seeds in the seed bin can be discharged, which is convenient for seed clearing operations. In the process of continuous sowing of various seeds, the mixed sowing of seeds of different varieties can be avoided. A collection box for collecting excess seeds can be set under the seed bin, and the excess seeds can fall into the collection box after the seeding piece 9 is opened.

[0054] The utility model can realize one-time seeding operation when the seeding disc 2 rotates at a smaller angle by reducing the length of the arc groove 17, and can shorten the seeding time. Since the seeding time is greatly shortened, more sufficient time is reserved for seed replacement and seed preparation, so that the sowing distance can be reduced. When multiple small fields are sown continuously, the sowing distance and the interval distance between two adjacent small fields can be reduced.

[0055] There is no need to use negative pressure during the seed cleaning process, and the power requirement for the fan is low, which can reduce energy consumption.

[0056] The seeding disc 2 is driven to rotate by a servo motor. Under the premise of ensuring that the overall travel speed of the seeder remains unchanged, the sowing spacing can be changed by changing the rotation speed of the seeding disc 2 by the servo motor. This is suitable for sowing different types of seeds and has a wide range of applications.

[0057] While the seeds sown for the last time in the previous plot are adsorbed to the adsorption holes 3, the front side of the seed bin can be opened and the excess seeds in the seed bin can be discharged. After the previous field is sown, the tractor is always moving during the seed cleaning and seed changing process between multiple fields. The servo motor and the seeding disc 2 can be temporarily paused. At this time, an adsorption hole 3 on the seeding disc 2 is at the rear side of the seed bin. After the seeds fall into the seed bin from the external seed storage device, the seeding disc 2 is started to rotate. In this way, the problem of incomplete seed cleaning in the seed bin is avoided under the condition that the seeding disc 2 is always running, and the situation that the seeds cannot be accurately sown according to the field spacing requirements after entering the seed bin. When the seeds fall into the seed bin, collisions are likely to occur, resulting in an uncertain number of seeds adsorbed by the seeding disc 2. Under the condition that the seeding disc 2 is always moving, the seeds are sown with the seeding disc 2 as soon as they enter the seed bin, which cannot meet the requirements of different field spacings. The servo motor shortens the seeding time and further advances the seed cleaning and seed changing time. The adjustable time and distance of the seeding device are more abundant, which can improve the sowing accuracy of the seeding device.

[0058] The seeding device has a short seed changing time and a short sowing distance, so it can reduce the distance between adjacent small fields and make full use of the test fields. The temporary pause of the servo motor can eliminate the error of the tractor's travel speed and travel distance on the rotation angle of the seeding disc, and can effectively control the corresponding relationship between the adsorption holes on the seeding disc and the sowing position, so that the aisles between adjacent small fields are neatly aligned.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plot breeding air suction seeding device, comprising a rear plate (1), a wheel groove is provided at the front end of the rear plate (1), a seeding disc (2) is rotatably arranged in the wheel groove, the rear end of the seeding disc (2) is rotatably sealed and connected to the rear plate (1), a plurality of groups of adsorption holes (3) are evenly distributed on the circumference of the seeding disc (2), a front plate (4) is installed on the front side of the rear plate (1), and the characteristics are as follows: A seed feeding tube (7) is fixed to the right end of the front plate (4), and a seed bin connected to the seed feeding tube (7) is arranged at the lower end thereof. The seed bin is wedge-shaped as a whole, and the rear end of the seed bin is open. The rear end of the seed bin is in sliding contact with the front end of the seeding disk (2). The front side of the seed bin can be opened to allow excess seeds in the seed bin to be discharged. A vertical seed placement channel (16) is arranged at the rear end of the front plate (4), and the seed placement channel (16) is located on the right side of the rotation axis of the seeding disk (2). An inlet hole (14) is provided on the upper end of the seeding plate (16) facing the seeding tube (7), an arc-shaped groove (17) is provided on the rear plate (1) on the rear side of the seeding plate (2), the lower end of the arc-shaped groove (17) corresponds to the seed bin, the upper end of the arc-shaped groove (17) corresponds to the upper end of the seeding channel (16), an air duct (18) connected to the arc-shaped groove (17) is fixed on the rear plate (1), and the adsorption hole (3) corresponds to the arc-shaped groove (17) along the movement trajectory of the seeding plate (2).

2. A plot breeding air suction seed metering device according to claim 1, characterized in that: The seed bin comprises two side baffles (8) symmetrically arranged on the left and right, the upper ends of the side baffles (8) being fixedly connected to the lower ends of the seed inlet tubes (7), seed discharge plates (9) being arranged at the front sides of the baffles (8) on both sides, the seed discharge plates (9) being in contact with the front ends of the side baffles (8), the upper ends of the seed discharge plates (9) being fixedly provided with rotating shafts (10), the rotating shafts (10) being rotatably connected to the brackets (6), the brackets (6) being fixedly connected to the front plate (4), the seed inlet tubes (7) being fixedly connected to the brackets (6), and the front ends of the seed inlet tubes (7) being provided with a driving mechanism for driving the seed discharge plates (9) to rotate around the rotating shafts (10).

3. A plot breeding air suction seed metering device according to claim 2, characterized in that: The driving mechanism comprises an electromagnetic push rod (11) fixed at the front end of the seed feeding tube (7), a pin shaft is rotatably connected to the telescopic rod of the electromagnetic push rod (11), a support rod (12) is fixed at the front end of the seed discharging piece (9), a long slot (13) is formed on the support rod (12), and the pin shaft passes through the long slot (13).

4. The air suction seed metering device for plot breeding according to claim 1, characterized in that: A guide piece (15) is arranged in the inlet hole (14), the upper end of the guide piece (15) is inclined toward a side away from the seed placement channel (16), the lower end of the guide piece (15) is fixedly connected to the front plate (4), and the guide piece (15) is in sliding contact with the seed placement disc (2).

5. The air suction seed metering device for plot breeding according to claim 1, characterized in that: A seed placement tube (5) communicating with a seed placement channel (16) is fixed to the lower end of the front plate (4).

6. The air suction seed metering device for plot breeding according to claim 1, characterized in that: The seeding disc (2) is driven by a servo motor.

7. The air suction seed metering device for plot breeding according to claim 1, characterized in that: The air duct (18) is connected to the exhaust fan.

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