A pneumatic plot seed meter capable of automatically replanting

Abstract

The present invention provides an air-suction type plot seeding device capable of automatic reseeding, which comprises a shell, a seeding disk, a seed feeding mechanism and a seed clearing mechanism. A negative pressure cavity is provided in the shell, and a seeding disk is rotatably installed. A seed feeding mechanism and a seed clearing mechanism, as well as corresponding seed filling chambers and seed collection chambers are provided on the shell. The seed filling chamber is indirectly connected to the negative pressure cavity through the seeding disk, and the seed collection chamber is connected to the seed filling chamber through a switch valve. The seeding disk is provided with main seed stirring teeth and auxiliary seed stirring teeth, and a seed suction groove is provided on the seeding disk inside the auxiliary seed stirring teeth. A vacancy detection device is also installed at the rotary position of the seeding disk, and is connected to the driver of the power unit. The present invention realizes the seeding and seed clearing operations of a single machine by setting interconnected seed filling chambers and seed collection chambers, which is not only simple in structure and low in cost, but also highly efficient in use; combined with the design of the main and auxiliary seed stirring teeth and the vacancy detection device, the sowing accuracy is guaranteed, and the missed sowing and reseeding rates can be greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural equipment, and in particular relates to an air-suction type plot seed metering device capable of automatic reseeding. Background Art

[0002] China is a major rice producer and grower, and the quality of rice seeds determines grain yields. Studies have shown that planting superior rice varieties can increase crop yields by 5% to 15% and boost agricultural output by at least 50%.

[0003] With the advancement of science and technology, more and more breeders have realized that breeding new and superior varieties is a key factor in increasing crop yields. As a result, variety improvement companies and research institutions have an increasingly urgent demand for plot planters for rice variety improvement trials. In rice variety improvement trials, the test site is artificially divided into multiple plots, each of which is planted with seeds of a different variety. During planting, the test seeds need to be placed into the seed filling chamber one by one in the order of the plots, and the remaining seeds in the seed trough are emptied at the end of each plot. Furthermore, all plots in the same trial need to be sown on the same day to reduce the impact of environmental factors on the test results. Different varieties are sown in different plots, so that the priority varieties can be determined through manual post-inspection. Therefore, breeders need to ensure that the seed meter cleans up the remaining seeds after sowing a plot, so they need a rice direct seeding machine with high sowing and seed cleaning efficiency.

[0004] In existing technology, the seed meter is a core component of a rice direct seeding machine, directly impacting sowing accuracy and seed emergence rate. For plot breeding experiments, the plot meter also needs to be able to completely clear any remaining seeds from the previous plot to prevent confusion with seeds from the next plot. This is the key difference between plot planters and traditional field planters. Therefore, while ensuring quantitative sowing, the plot rice seed meter must also prevent seed mixing and damage, and maintain a high seed replacement rate, ensuring consistent rice types within each plot.

[0005] Seeders are commonly found in both imported and domestically produced seed-breeding machinery. While imported seed-breeding machinery offers multiple functions, they are complex and expensive. Furthermore, they don't fully meet the agronomic requirements of various regions of my country, particularly the field conditions and breeding practices in southern China. In particular, during the seed-stirring process, friction between seed groups or between seeds and the seed disc can cause seeds to fail to adhere to the disc's seed cavity, leading to missed seeding. Meanwhile, the predominant seed-stirring mechanism used in domestically produced precision seeding systems for plot breeding is the cone-shaped grid-shaped seed-stirring mechanism. While simpler and less expensive, this mechanism is limited to row seeding.

[0006] Alternatively, the improved, multi-generational, small-area air-suction rice seeding device for domestically produced breeding machinery can achieve seed clearing and seed replacement, but it cannot guarantee the number of seeds adsorbed on the seed tray during the sowing process. Furthermore, the guide mechanism cannot effectively guide the seeds into the seed cavity. The suction holes are also simply designed, and cannot effectively adsorb the seeds in the intended manner. This leads to a high rate of repeated and missed sowing, high resource consumption, and failure to achieve the desired effect of seed conservation. Furthermore, the possibility of empty seeds being present during the negative pressure adsorption process onto the seed tray is unavoidable, significantly impacting small-area breeding and sowing. Once missed sowing occurs, manual reseeding is required, consuming both manpower and material resources.

[0007] In summary, in order to realize agricultural mechanization and automation, reduce production and use costs while ensuring the multifunctionality of the seed meter, and achieve the purpose of reducing manpower, speeding up the sowing process, and reducing the missed sowing rate, it is necessary to improve the plot seed meter. Summary of the Invention

[0008] Aiming at the problems existing in the prior art, the present invention provides an air-suction type plot seed metering device capable of automatic reseeding to solve the above problems.

[0009] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] The present invention provides an air-suction type plot seed meter capable of automatic reseeding, comprising a housing, a seeding disc, a power unit, a seed feeding mechanism and a seed clearing mechanism;

[0011] A negative pressure cavity is provided in the shell, and the seed disc is rotatably mounted therein; the power unit is connected to the seed disc and is used to drive the seed disc to rotate; the shell is provided with the seed feeding mechanism and the seed cleaning mechanism;

[0012] The shell is further provided with a seed filling chamber and a seed collecting chamber. The seed feeding mechanism is provided with a seed feeding port and is connected to the seed filling chamber; the seed cleaning mechanism is provided with a seed cleaning port and is connected to the seed collecting chamber; the seed filling chamber is indirectly connected to the negative pressure chamber through the seed discharging disc, and the seed collecting chamber is connected to the seed filling chamber through a switch valve;

[0013] An isolation cavity is provided between the seeding disc and the shell, and a seeding port is provided on the shell opposite to the isolation cavity;

[0014] The seeding disc is provided with a plurality of main seed stirring teeth uniformly distributed along the circumference, and at least one auxiliary seed stirring tooth is provided between two adjacent main seed stirring teeth; a seed suction groove is provided on the seeding disc inside the auxiliary seed stirring teeth; the seed suction groove is a sunken platform structure, and a through hole is provided at the bottom, and the through hole is connected to the negative pressure cavity or the isolation cavity;

[0015] It also includes an empty position detection device, which is installed on at least one rotary position of the seed disc; the empty position detection device is connected to the driver of the power unit.

[0016] Optionally, the main stirring teeth are boss structures, presenting a tooth-shaped profile when viewed from above, and having rounded corners;

[0017] The auxiliary seed stirring teeth are boss structures, and have a pseudo-elliptical outline when viewed from above; the central axis of the auxiliary seed stirring teeth is tangent to a concentric circle of the seed plate.

[0018] Optionally, the auxiliary seed stirring teeth are bullet-shaped when viewed from above, and the concentric circles tangent to the central axis of the auxiliary seed stirring teeth are also tangent to the endpoints of the main seed stirring teeth;

[0019] Along the rotation direction of the seed disc, the front end of the auxiliary seed stirring tooth is a sharp arc portion, and the rear end is a straight portion or an arc portion.

[0020] Optionally, the seed suction groove has an elliptical outline and geometric dimensions adapted to a single seed;

[0021] At least one seed suction groove is provided between two adjacent main seed stirring teeth, and a seed suction groove is correspondingly provided on the inner side of each auxiliary seed stirring tooth.

[0022] Optionally, the housing includes a front housing and a rear housing;

[0023] The seeding disc is fitted with the rear shell, and the empty area forms the negative pressure cavity and the isolation cavity;

[0024] The isolation chamber is not connected to the negative pressure chamber, and the seed discharging port is arranged on the front shell.

[0025] Optionally, an air extraction port is provided on the rear shell, and is connected to an external air extraction device through a pipeline.

[0026] Optionally, the seed feeding mechanism includes a first switch valve;

[0027] The seed inlet is a hopper structure, the seed filling chamber is connected to the hopper via a pipeline, and the first switch valve is provided on the pipeline.

[0028] Optionally, a baffle brush is provided on the side of the seed filling chamber, and the baffle brush is located between the seed filling chamber and the seed plate;

[0029] The long side direction of the brush guard forms an angle with the horizontal plane.

[0030] Optionally, the seed clearing mechanism includes a second switch valve;

[0031] The second switch valve is provided between the seed filling chamber and the seed collecting chamber.

[0032] The seed cleaning port is an elbow structure, and the seed collecting cavity is connected to the seed cleaning port through a pipeline.

[0033] Optionally, the vacancy detection device is a laser sensor having a transmitting end and a receiving end;

[0034] The power unit includes a controller, a driver and a motor;

[0035] The receiving end is connected to the controller.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention realizes the seeding and seed clearing operations of a single machine by setting up interconnected seed filling chamber and seed collection chamber, which is not only simple in structure and low in cost, but also highly efficient. Combined with the design of main and auxiliary seed stirring teeth and the empty position detection device, the sowing accuracy is guaranteed and the missed seeding and reseeding rates can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 It is a front perspective view of a specific embodiment of the present invention;

[0040] Figure 2 It is a rear perspective view of a specific embodiment of the present invention;

[0041] Figure 3 This is a front view of a specific embodiment of the present invention;

[0042] Figure 4 This is a front perspective view of the front housing in a specific embodiment of the present invention;

[0043] Figure 5 This is a perspective view of the rear side of the front housing in a specific embodiment of the present invention;

[0044] Figure 6 It is a side perspective view of the front housing in a specific embodiment of the present invention;

[0045] Figure 7 This is a three-dimensional diagram of the installation position of the seeding disk in a specific embodiment of the present invention;

[0046] Figure 8 An enlarged top view of the main stirring teeth and the auxiliary stirring teeth in a specific embodiment of the present invention;

[0047] Figure 9It is a three-dimensional diagram of the vacancy detection device and the power unit in a specific embodiment of the present invention;

[0048] Figure 10 It is a three-dimensional diagram of the rear shell in a specific embodiment of the present invention.

[0049] In the figure: 1. front shell, 2. rear shell, 3. seeding disc, 4. seed feeding mechanism, 5. seed cleaning mechanism, 6. controller, 7. driver, 8. motor, 9. power shaft, 10. seeding port, 11. laser transmitter, 12. laser receiving tube, 101. reserved installation hole, 102. sinking platform structure, 103. seed filling chamber inlet, 104. side opening, 105. seed discharging sinking platform, 106. brush, 201. air extraction port, 202. mounting hole, 203. isolation chamber, 301. disc body, 302. main seed stirring tooth, 303. auxiliary seed stirring tooth, 304. seed suction groove, 305. through hole, 401. seed feeding port, 402. first linear cylinder, 403. first valve body, 501. seed cleaning port, 502. second linear cylinder, 503. second valve body, 504. slide DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0052] In the description of the present invention, it should be understood that the relative relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the order of contact with the material in the rotation direction in actual application. They are for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the equipment or components referred to must have a specific position. Therefore, they should not be understood as limitations on the present invention.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0054] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted" and "connected" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] It should also be noted that the methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products unless otherwise specified.

[0056] The present invention provides a Figure 1 、 Figure 2 The air-suction plot seed metering device capable of automatic reseeding shown mainly comprises a shell, a seeding disc, a power unit, a seed feeding mechanism 4 and a seed clearing mechanism 5.

[0057] Among them, combined Figure 3-Figure 6 and Figure 10 As shown, the shell is a disc-type structure, which adopts a split structure and includes a front shell 1 and a rear shell 2. A cavity is left between the front shell 1 and the rear shell 2, and is used to rotatably install the seed disc 3. The seed disc 3 is also a disc-type structure, and fits the edge of the rear shell 2, with a gap in the middle to form a negative pressure cavity. An air suction port 201 is processed on the rear shell 2, which is connected to the negative pressure cavity and is connected to an external air suction device (such as a fan) through a pipeline to create the required negative pressure. An isolation cavity 203 is also provided in the cavity between the seed disc 3 and the rear shell 2, which is separated from the negative pressure cavity by a rib structure that is radially raised on both sides. The opening angle of this fan-shaped area is preferably 30°-50°.

[0058] The power unit of this embodiment includes a motor 8 and a matching driver 7 and a controller 6. The power shaft 9 of the motor 8 passes through the axial hole on the rear housing 2 and is coaxially connected to the seed disc 3 for driving it to rotate around the axis.

[0059] The front shell 1 is provided with a flange on the peripheral side and a through hole is processed for bolt connection with the rear shell 2. There is also a gap between the inner side of the front shell 1 and the seed disc 3. A sinking structure 102 is also provided near the middle area, and a seed filling chamber with a slope structure is provided on the front side. The seed filling chamber inlet 103 is processed on the upper end face of the seed filling chamber, and a seed feeding mechanism 4 is installed. The seed inlet 401 of the seed feeding mechanism 4 is a hopper structure and is connected to the seed filling chamber through a straight pipe. A first switch valve is installed at the bottom of the straight pipe; optionally, there are many types of first switch valves. In this embodiment, a pneumatic valve is used as an example for explanation, wherein a first linear cylinder 402 is installed on the first valve body 403, and the valve core is a slide with a folded edge, one end of which is connected to the piston rod of the first linear cylinder 402, and the other end is inserted into the first valve body 403. The first valve body 403 is controlled to switch by the movement of the piston rod.

[0060] Furthermore, a seed clearing mechanism 5 is installed laterally to the seed feed mechanism 4. The seed collection chamber is detachably connected to the front housing 1, forming a square box-shaped structure with a side opening for a seed clearing port 501. This port 501 is an outward-facing elbow. The seed collection chamber communicates with the seed filling chamber via a side opening 104, where a second on-off valve is installed. A second linear cylinder 502 is mounted on the second valve body 503 of the second on-off valve. The piston rod controls the valve core's slide 504, opening and closing the side opening 104.

[0061] The front shell 1 is also provided with a plurality of reserved installation holes 101 for installing a vacancy detection device or other accessories, and a lateral opening at the rear forms a seeding port 10 with the rear shell 2, and a seeding sink 105 is processed on the inner front shell 1, which is located on the opposite side of the isolation cavity 203 as the seeding port 10. When the seeds on the seeding disc 3 move to this place, they fall due to the lack of negative pressure and are discharged through the seeding port 10.

[0062] Combine Figure 7 、 Figure 8 , a plurality of main stirring teeth 302 are evenly distributed along the circumference of the disc body 301 of the seeding disc 3; optionally, the main stirring teeth 302 are a connected boss structure, with a tooth-shaped profile when viewed from above, and the corners are processed with rounded corners to reduce damage to the seeds during stirring. At least one auxiliary stirring tooth 303 is provided between two adjacent main stirring teeth 302; in this embodiment, a specific auxiliary stirring tooth 303 is used as an example for explanation, wherein the auxiliary stirring tooth 303 is a single boss structure, with a pseudo-elliptical profile when viewed from above, specifically as shown in FIG. Figure 8 As shown, it is in the shape of a bullet, with a sharp arc at the front end along the rotation direction and a straight part at the rear end. The corners are rounded. This rounded corner treatment of the tail of the auxiliary stirring tooth can better remove excess seeds through the centrifugal force of the seeding disc and reduce the reseeding rate. In order to improve the stirring performance, the central axis of the auxiliary stirring tooth 303 is designed to be concentric with a circle of the seeding disc 3 ( Figure 8The circle where the dotted line is located is tangent to it, and the concentric circle is designed to be tangent to the endpoints of the main stirring teeth 302 on both sides, so as to ensure that the auxiliary stirring teeth 303 can all participate in the stirring work and put the seeds in the contact area in the right direction. A seed suction groove 304 is provided on the disk body 301 inside each auxiliary stirring tooth 303. The seed suction groove 304 is a sunken platform structure with a through hole 305 at the bottom, and the through hole 305 is connected to the negative pressure cavity or isolation cavity 203 on the rear side (different rotation positions correspond to different cavities). Optionally, the outline of the seed suction groove 305 is elliptical, and the geometric dimensions are adapted to a single seed, that is, a single seed can be placed just in it, and the long axis of the outline of the seed suction groove 305 is designed to be tangent to a concentric circle of the disk body 301, keeping it consistent with the direction of the auxiliary stirring teeth 303. The similarly shaped seed suction groove 305 allows the seeds to fall into the groove due to adsorption and entrainment when passing through the nearby area, making the operation more reliable and accurate, ensuring one groove for one seed with high precision, and effectively reducing the phenomenon of reseeding and missed seeding. Moreover, due to the entrainment effect of the elliptical structure, the negative pressure requirement for the fan is reduced, which is more energy-saving and the operation is reliable and efficient. Furthermore, this embodiment also designs the shortest radial spacing between the edge of the seed suction groove 305 and the edge of the auxiliary seed stirring tooth 303 to be less than the transverse cross-sectional diameter of a single seed. Based on the above design, during the rotation of the seed disc 3, the main and auxiliary seed stirring teeth play a role in stirring, separating, combing and guiding the seeds close to the disc surface. During the seed separation process, the force between seeds changes from static friction to dynamic friction, which increases the fluidity of the seeds and puts them in a state that is conducive to adsorption. At the same time, it can guide the seeds to enter the seed suction groove 305 better, improve the adsorption performance of the seed meter, and reduce the reseeding rate and missed seeding rate of the seed meter. Under the same working conditions in the experiment, the vacancy rate (the probability that the seed suction groove 305 does not absorb seeds after the seed filling cavity) can be reduced from 25%-30% to below 5%, effectively improving the working efficiency of the whole machine. Figure 3 As shown, in this embodiment, the installation position of the whole machine is designed to have an inclination angle around the power shaft 9. The inclination angle α can be understood as the angle between the plane where the side opening 104 is located and the horizontal plane. The angle range is 40°-60°, preferably 45°. Figure 5 As shown, in order to prevent the sucked seeds from falling into other positions, a brush 106 is installed along the edge of the lower side of the side opening 104 (the angle between the long side direction of the brush 106 and the horizontal plane is also α). The seeds falling into the seed filling chamber can be stacked exactly at the position of the brush 106 under the action of gravity, which makes it convenient for the main and auxiliary seed stirring teeth to directly touch the seeds. Under the action of gravity, the seeds can better fit the contour movement of the auxiliary seed stirring teeth, successfully guiding the seeds to slide into the seed suction groove, and at the same time, it also has a better effect of cleaning excess seeds during the seed cleaning process, speeding up the seed suction and cleaning process, and reducing the energy consumption of the negative pressure fan to a certain extent.

[0063] The seeding device of this embodiment further includes a vacancy detection device, and the vacancy detection device is installed at at least one rotation position of the seeding disc 3; optionally, Figure 9 As shown, the vacancy detection device is a laser sensor, which is provided with a laser emitter 11 and a laser receiving tube 12. The laser emitter 11 is mounted on a mounting hole 101 of the front housing 1, and the laser receiving tube 12 is mounted on the mounting hole 202 of the rear housing 2 by screws. When the seed suction slot 305 that has not sucked in seeds rotates here, the laser emitted by the laser emitter 11 passes through the through hole 305 and enters the laser receiving tube 12, triggering a vacancy signal. The laser receiving tube 12 is connected to the controller 6 via a cable, and the controller 6 issues a speed control command, which is transmitted to the driver 7 via the cable. The controller 7 controls the motor 8 to rotate 1-3 rotation positions quickly via the cable to ensure that the seeds fall into the corresponding seed holes. Optionally, the controller 6 is also connected to an external GNSS locator. The GNSS locator feeds back to the controller 6 based on the real-time speed of the cell seeder. The controller 6 then transmits a signal to the driver 7 to drive the motor 8 to increase or decrease the speed, thereby ensuring the sowing spacing and allowing the seeds to fall into the planned seed holes.

[0064] How it works

[0065] (1) When sowing is required, the first switch valve is opened (the second switch valve is closed), the seeds from the seed inlet fall into the seed filling chamber, and the seeding disc rotates. When the main and auxiliary stirring teeth pass through the seed filling chamber, they can better adsorb the seeds in the seed suction groove during the stirring process. Under the action of the negative pressure of the fan, the seeds are transferred to the seed dropping area, that is, the corresponding position of the isolation chamber, as the seeding disc rotates; during this period, if the seeds are adsorbed in the seed suction groove, the laser emitted by the laser transmitter cannot shine on the laser receiving tube, and the sowing is carried out according to the normal process. As the negative pressure disappears, the seeds fall into the seed hole under the action of gravity, and the sowing is completed; if a certain seed suction groove on the seeding disc does not adsorb the seeds, the laser emitted by the laser transmitter shines on the laser receiving tube, and the signal is transmitted to the controller, and then the controller immediately converts the optical signal into an electrical signal and transmits it to the driver, which drives the motor. The motor increases the speed to make the seeding disc rotate 1-3 rotation positions (determined by the signal of the laser receiving tube) quickly to achieve re-seeding.

[0066] (2) When a plot needs to be changed after sowing, the second switch valve is opened (the first switch valve is closed), the negative pressure of the fan is maintained, and the seed disc is reversed; during this period, the excess seeds in the seed filling chamber are all returned to the seed collection chamber under the action of gravity and the slope, and the excess seeds on the seed disc are blocked by the brush and escape from the seed suction groove, and also enter the seed collection chamber and are recovered from the seed cleaning port; after the seed cleaning is completed, the first switch valve is controlled to open (the second switch valve is closed), and the seeds of the next plot fall into the seed filling chamber, thus completing a cycle, and so on until the sowing operation of all plots is completed.

[0067] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. An air-suction type plot seed metering device capable of automatic replanting, characterized in that: It includes a housing, a seeding disc, a power unit, a seed feeding mechanism and a seed cleaning mechanism; A negative pressure cavity is provided in the shell, and the seeding disc is rotatably mounted therein; the power unit is connected to the seeding disc and is used to drive the seeding disc to rotate; the shell is provided with the seed feeding mechanism and the seed cleaning mechanism; The shell is also provided with a seed filling chamber and a seed collecting chamber. The seed feeding mechanism is provided with a seed feeding port and is connected to the seed filling chamber; the seed cleaning mechanism is provided with a seed cleaning port and is connected to the seed collecting chamber; the seed filling chamber is indirectly connected to the negative pressure chamber through the seed discharging disc, and the seed collecting chamber is connected to the seed filling chamber through a switch valve; An isolation cavity is provided between the seeding disc and the shell, and a seeding port is provided on the shell on the opposite side of the isolation cavity; The seeding disc is provided with a plurality of main seed stirring teeth evenly distributed along the circumferential direction, and at least one auxiliary seed stirring tooth is provided between two adjacent main seed stirring teeth; a seed suction groove is provided on the seeding disc inside the auxiliary seed stirring teeth; the seed suction groove is a sink structure, a through hole is provided at the bottom, and the through hole is connected to the negative pressure cavity or the isolation cavity; The main stirring teeth are boss structures, with tooth-shaped profiles when viewed from above, and the corners are rounded; The auxiliary seed stirring tooth is a boss structure, and is in the shape of a bullet when viewed from above; the central axis of the auxiliary seed stirring tooth is tangent to a concentric circle of the seed discharging disc, and the concentric circle tangent to the central axis of the auxiliary seed stirring tooth is also tangent to the end point of the main seed stirring tooth; Along the rotation direction of the seeding disc, the front end of the auxiliary seed stirring teeth is a sharp arc portion, and the rear end is a straight portion or an arc portion; The seed suction groove has an elliptical outline and a geometric size adapted to a single seed; At least one seed suction groove is provided between two adjacent main seed stirring teeth, and a seed suction groove is correspondingly provided on the inner side of each auxiliary seed stirring tooth; It also includes an empty position detection device, which is installed on at least one rotary position of the seeding disc; the empty position detection device is connected to the driver of the power unit; The vacancy detection device is a laser sensor having a transmitting end and a receiving end; The power unit includes a controller, a driver and a motor; The receiving end is connected to the controller.

2. The air-suction type plot seed metering device capable of automatic replanting according to claim 1, characterized in that: The housing comprises a front housing and a rear housing; The seeding disc is fitted with the rear shell, and the empty area forms the negative pressure cavity and the isolation cavity; The isolation chamber is not connected to the negative pressure chamber, and the seed discharge port is arranged on the front shell body.

3. The air-suction type plot seed metering device capable of automatic replanting according to claim 2, characterized in that: The rear shell is provided with an air extraction port, and is connected to an external air extraction device through a pipeline.

4. The air-suction type plot seed metering device capable of automatic replanting according to claim 1, characterized in that: The seed feeding mechanism comprises a first switch valve; The seed inlet is a hopper structure, the seed filling chamber is connected to the hopper through a pipeline, and the first switch valve is arranged on the pipeline.

5. The air-suction type plot seed metering device capable of automatic replanting according to claim 1, characterized in that: A baffle brush is provided on the side of the seed filling cavity, and the baffle brush is located between the seed filling cavity and the seeding disc; The long side direction of the brush guard forms an angle with the horizontal plane.

6. The air-suction type plot seed metering device capable of automatic replanting according to claim 1, characterized in that: The seed clearing mechanism comprises a second switch valve; The second switch valve is provided between the seed filling chamber and the seed collection chamber; The seed cleaning port is an elbow structure, and the seed collecting cavity is connected to the seed cleaning port through a pipeline.

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