A toothed disc type pneumatic mechanical combined seed metering device and its control method

Abstract

This invention discloses a toothed disc type pneumatic mechanical combined seed metering device and its control method, specifically relating to the field of seeder technology. It includes a grooved wheel seed metering assembly, a pneumatic seed box assembly, a pneumatic seed metering assembly, and a transmission assembly. The grooved wheel seed metering assembly is mounted on top of the pneumatic seed metering assembly. This invention allows for different working combinations between the grooved wheel seed metering assembly and the pneumatic seed metering assembly, further increasing the adjustment range of the seeding rate on top of the existing advantages of the pneumatic seed metering assembly. This overcomes the difficulty of large-volume hill-sowing operations in the field with a single pneumatic seed metering device. The seed metering disc rotates on a plane bearing under meshing action, and the rotating shaft is a passive shaft without power transmission. Therefore, this device is an independent unit. While ensuring the upper-level transmission, it can be fixed or moved on the frame through the mounting holes in the air chamber shell, effectively improving the flexibility of the seeding device and facilitating the adjustment of planting row spacing.

Description

Technical Field

[0001] This invention relates to the field of seeder technology, and more specifically, to a toothed disc type pneumatic mechanical combined seed metering device and its control method. Background Technology

[0002] The toothed disc pneumatic mechanical seed metering device is a type of machinery used in agricultural planting. It achieves precise seed dispensing and quantitative planting through pneumatic transmission and a toothed disc structure. The toothed disc pneumatic mechanical seed metering device can adjust the aperture and rotation speed of the toothed disc according to the seed size and planting requirements of different crops, thus achieving precise seed dispensing for various crops. It features uniform seed dispensing, adjustable planting density, and high working efficiency, which can improve planting efficiency and crop yield.

[0003] Existing seed metering devices are mainly divided into two categories: mechanical and pneumatic. Mechanical seed metering devices mostly use orifice or grooved wheel seed metering, while pneumatic seed metering devices use negative pressure airflow to adsorb and meter seeds from the seed box or use positive pressure airflow to blow seeds to various seeding systems. Mechanical seed metering devices usually have a large seeding rate, but the seeding rate is random and difficult to apply to precision seeding operations. Pneumatic seed metering devices usually have a small seeding rate, and although they can have high seeding accuracy, the adjustment range of seeding rate and agronomic adaptability are limited. Therefore, a toothed disc pneumatic-mechanical combined seed metering device that can achieve precision seeding and adjust the seeding rate range is provided. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a toothed disc type pneumatic mechanical combined seed metering device and its control method, aiming to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a toothed disc type pneumatic mechanical combined seed metering device, comprising a grooved wheel seed metering assembly, a pneumatic seed box assembly, a pneumatic seed metering assembly and a transmission assembly, wherein the grooved wheel seed metering assembly is connected to and installed on the top of the pneumatic seed metering assembly;

[0006] The grooved wheel seed dispensing assembly includes a seed box housing installed on top of the pneumatic seed dispensing assembly and used for material storage. The bottom of the seed box housing is provided with a grooved wheel lower housing for guiding material. The interior of the grooved wheel lower housing is provided with an outer grooved wheel for dispensing material. The middle of the outer grooved wheel is provided with a grooved wheel shaft for driving the outer grooved wheel to rotate. The outer side of the grooved wheel shaft is movably connected to a bushing installed on the grooved wheel lower housing, and the outer side of the grooved wheel lower housing is provided with a retaining ring for limiting the position of the seed box housing.

[0007] The pneumatic seed box assembly includes two seed dispensing boxes for guiding materials, and each seed dispensing box is respectively arranged on both sides of the pneumatic seed dispensing assembly. The top of each seed dispensing box is provided with a seed box cover for blocking, and the seed box cover is slidably connected to the seed dispensing box.

[0008] The pneumatic seed metering assembly includes an air chamber housing for guiding the material. The air chamber housing is located between the lower housing of the grooved wheel and the seed metering box. Each side of the air chamber housing has an outer shell of the air chamber, which is respectively mounted on and connected to the corresponding seed metering box. Two brushes are provided on the side of each outer shell facing the air chamber housing. Two seed metering toothed discs are respectively provided on both sides of the air chamber housing and between the two outer shells. A plane bearing is provided on one side of each seed metering toothed disc. The air chamber housing has a seed dropping channel for seed dropping. Several seed suction holes are formed through the seed metering toothed discs. A sealing edge is provided on the outer side of each seed metering toothed disc for sealing. Two rotating shafts are provided on the air chamber housing for support. A central hole matching the rotating shaft is formed in the middle of each seed metering toothed disc. One end of each rotating shaft is located on one side of the seed metering toothed disc. A locking nut for limiting the seed metering toothed disc is provided. A bearing for supporting the rotating shaft is provided on the outside of the rotating shaft and inside the air chamber housing. The bearing is movably connected to the rotating shaft, and a bearing end cap is provided on one end of the bearing on the outside of the rotating shaft. Air chamber housing mounting holes for positioning are provided at both ends of the air chamber housing. A seed protection shell is provided on one side of the inner wall of the seed metering toothed disc. A bearing mounting position for bearing installation is provided inside the air chamber housing. The bearing mounting position is installed inside the air chamber housing by bolts. A shell mounting hole for air chamber housing installation is provided on the outside of the air chamber housing. A grooved wheel assembly mounting hole for mounting the grooved wheel lower shell is provided on the top of the air chamber housing. A negative pressure channel for guiding flow is provided on the outside of the air chamber housing. A negative pressure air chamber connected to the negative pressure channel is provided inside the air chamber housing.

[0009] As can be seen, in the above technical solution, when the seed suction hole on the seed metering toothed disc is connected to the negative pressure air chamber, the seeds flowing from the seed metering box to the air chamber shell and the seed metering toothed disc are adsorbed into the seed suction hole under the action of suction. At that time, as the seed metering toothed disc rotates, when it moves to the point where the seed suction hole is disconnected from the negative pressure air chamber, the seeds fall under the action of gravity. By changing the meshing arrangement of each seed metering toothed disc, the seeding amount of the pneumatic seed metering assembly can be changed. During the rotation of the outer groove wheel, the seeds are carried by the groove on its surface and pass through the seed drop channel so that the seeds and the seeds released by the pneumatic seed metering assembly meet when they fall. When each seed metering toothed disc and the outer groove wheel work at the same time, and the seed drop of each groove is synchronized with the seed drop of each seed metering toothed disc, the seeding amount can reach the maximum. When the outer groove wheel does not participate in the work and only the seed suction hole on a single seed metering toothed disc participates in each seed drop of the pneumatic seed metering assembly, the seeding amount of the device is the minimum.

[0010] The transmission assembly includes a first sprocket mounted on the Geneva shaft, a main shaft mounted on the outer side of the air chamber housing via a bearing housing, a second sprocket at one end of the main shaft, a third sprocket at the other end of the main shaft, a gear sleeve on the outer side of the main shaft, and a limiting shaft seat mounted on the main shaft movably connected to the middle of the bearing housing.

[0011] As can be seen, in the above technical solution, the third sprocket rotates and transmits power, the second sprocket, the gear sleeve and the main shaft rotate in the W direction, the seed metering toothed disc rotates around the rotating shaft under the meshing of the gear sleeve and the seed metering toothed disc on the same side, and the second sprocket drives the first sprocket to rotate through the chain, so that the outer grooved wheel rotates in the seed box shell and the lower shell of the grooved wheel.

[0012] Preferably, the present invention provides a control method applied to the above-mentioned toothed disc type pneumatic mechanical combined seed metering device, the method comprising the following steps:

[0013] Step 1: First, the staff installs the device on the seeder. The power drive mechanism, such as the output shaft of the power machinery, the electric motor, or the ground wheel, drives the third sprocket to rotate and transmit power. The second sprocket, the gear sleeve, and the main shaft rotate in the W direction. The seed metering toothed disc rotates around the rotating shaft under the meshing of the gear sleeve and the seed metering toothed disc on the same side. The second sprocket drives the first sprocket to rotate through the chain, so that the outer grooved wheel rotates in the seed box shell and the lower shell of the grooved wheel.

[0014] Step 2: The seed metering toothed disc meshing with the main shaft rotates in the W direction. When the seed suction hole on the seed metering toothed disc is connected to the negative pressure air chamber, the seeds flowing from the seed metering box to the air chamber shell and the seed metering toothed disc are sucked into the seed suction hole under the action of suction. At that time, as the seed metering toothed disc rotates, when it moves to the point where the seed suction hole is disconnected from the negative pressure air chamber, the seeds fall under the action of gravity.

[0015] Step 3: When the seed metering discs on both sides of the air chamber shell are arranged symmetrically, each seeding occurs simultaneously on all the seed metering discs. The seeding rate of the pneumatic seed metering assembly can be changed by altering the meshing arrangement of the seed metering discs. During rotation, the outer grooved wheel carries the seeds through the grooves on its surface and passes through the seeding channel, allowing the seeds to converge with those from the pneumatic seed metering assembly during seeding. The seeding rate of the grooved wheel seed metering assembly can be changed by varying the transmission ratio between the first and second sprockets. The seeding rate is maximized when all the seed metering discs and the outer grooved wheel work simultaneously, and the seeding in each groove is synchronized with the seeding on each seed metering disc. The seeding rate is minimized when the outer grooved wheel does not participate in the work and only the seed suction hole on a single seed metering disc participates in each seeding of the pneumatic seed metering assembly.

[0016] Step four: The sealing edge slides inside the air chamber shell, which reduces friction and resistance between the seed metering disc and the air chamber shell, and improves the airtightness between the seed metering disc and the air chamber shell. The seed metering disc rotates on a plane bearing under meshing action. The rotating shaft is a passive rotating shaft with no power transmission. This allows the device to be fixed or moved during installation through the mounting holes in the air chamber shell while ensuring the transmission to the upper stage. This effectively improves the flexibility of the sowing device and makes it easy to adjust the planting row spacing.

[0017] The technical effects and advantages of this invention are as follows:

[0018] 1. When the present invention is in use, the second sprocket, gear sleeve and main shaft rotate in the W direction. The seed metering toothed disc rotates around the rotating shaft under the meshing of the gear sleeve and the seed metering toothed disc on the same side. The second sprocket drives the first sprocket to rotate through the chain, so that the outer grooved wheel rotates in the seed box shell and the lower shell of the grooved wheel, which makes it easy to transport the material in the seed box shell through the seed dropping channel to the air chamber shell for sowing.

[0019] 2. When the seed suction hole on the seed metering toothed disc of the present invention is connected to the negative pressure air chamber, the seeds flowing from the seed metering box to the air chamber shell and the seed metering toothed disc are adsorbed into the seed suction hole under the action of suction. At that time, as the seed metering toothed disc rotates, when it moves to the point where the seed suction hole is disconnected from the negative pressure air chamber, the seeds fall under the action of gravity, which is convenient for seed transport.

[0020] 3. When the seeding toothed discs on both sides of the air chamber shell are arranged symmetrically, each seeding is done by all seeding toothed discs simultaneously. The seeding rate of the pneumatic seeding assembly can be changed by changing the meshing arrangement of each seeding toothed disc.

[0021] 4. In this invention, when the outer groove wheel rotates, the seeds are carried by the grooves on its surface and pass through the seed dropping channel, so that the seeds are mixed with the seeds released by the pneumatic seed metering assembly when they fall, which makes it easier to mix seeds and improves the diversity of seeding during the device.

[0022] 5. This invention can change the seeding rate of the grooved wheel seeding assembly by using different transmission ratios between the first and second sprockets. When each seeding tooth disc and the outer grooved wheel work simultaneously, and the seeding of each groove is synchronized with the seeding of each seeding tooth disc, the seeding rate can reach its maximum. When the outer grooved wheel does not participate in the work and only the seed suction hole on a single seeding tooth disc participates in each seeding of the pneumatic seeding assembly, the seeding rate of the device is minimized. Furthermore, the seeding tooth disc rotates on a plane bearing under meshing action, and the rotating shaft is a passive rotating shaft without power transmission. This allows the device to be fixed or moved during installation through the mounting holes of the air chamber housing while ensuring the transmission of the upper stage, effectively improving the flexibility of the seeding device and facilitating the adjustment of the planting row spacing.

[0023] In summary, the overall design is simple and the structure is reasonable. Through the corresponding cooperation of various structures, the grooved wheel seed metering assembly can form different working combinations with the pneumatic seed metering assembly. On the basis of the seeding rate adjustment advantage of the pneumatic seed metering assembly, the adjustment range of seeding rate is further increased, overcoming the problem of large-scale hill-sowing operations in the field with a single pneumatic seed metering device. The seed metering toothed disc rotates on a plane bearing under meshing action. The rotating shaft is a passive rotating shaft without power transmission. Therefore, the device is an independent unit. While ensuring the transmission of the upper stage, it can be fixed or moved on the frame through the mounting holes of the air chamber shell, effectively improving the flexibility of the seeding device and facilitating the adjustment of planting row spacing. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is an exploded view of the overall structure of the present invention.

[0027] Figure 3 This is a front view of the housing of the present invention mounted on the lower housing of the wheel hub.

[0028] Figure 4 This is a schematic diagram of the operation process of the pneumatic seed metering assembly of the present invention.

[0029] Figure 5 This is an exploded view of the pneumatic seed metering assembly of the present invention.

[0030] Figure 6 This is a front view of the pneumatic seed box assembly of the present invention.

[0031] Figure 7 This is a front view of the outer shell of the air chamber of the present invention.

[0032] Figure 8 This is a front view of the seed metering disc of the present invention.

[0033] The attached figures are labeled as follows: 1. Grooved wheel seed metering assembly; 101. Seed box housing; 102. Bushing; 103. Grooved wheel shaft; 104. Grooved wheel lower housing; 105. Snap ring; 106. Outer grooved wheel;

[0034] 2. Pneumatic seed box assembly; 201. Seed metering box; 202. Seed box cover;

[0035] 3. Pneumatic seed metering assembly; 301. Air chamber shell; 302. Brush; 303. Seed metering toothed disc; 304. Locking nut; 305. Surface bearing; 306. Bearing end cover; 307. Rotating shaft; 308. Bearing; 309. Air chamber shell; 310. Bearing shell; 311. Seed dropping channel; 312. Air chamber shell mounting hole; 313. Seed protective shell; 314. Seed suction hole; 315. Center hole; 316. Sealing edge; 317. Bolt; 318. Negative pressure channel; 319. Negative pressure air chamber; 320. Bearing mounting position; 321. Shell mounting hole; 322. Grooved wheel assembly mounting hole;

[0036] 4. Transmission assembly; 401. First sprocket; 402. Second sprocket; 403. Main shaft; 404. Gear sleeve; 405. Limiting bearing; 406. Third sprocket. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] As attached Figure 1-8 The toothed disc type pneumatic mechanical combined seed metering device and its control method are shown. Through the corresponding cooperation of various structures on the grooved wheel seed metering assembly 1, the pneumatic seed box assembly 2, the pneumatic seed metering assembly 3 and the transmission assembly 4, the grooved wheel seed metering assembly 1 and the pneumatic seed metering assembly 3 can form different working combinations. On the basis of the seeding rate adjustment advantage of the pneumatic seed metering assembly 3, the seeding rate adjustment range is further increased, overcoming the problem of large seeding rate hill-sowing operation in the field with a single pneumatic seed metering device. The seed metering toothed disc 303 rotates on the plane bearing 305 under meshing action. The rotating shaft 307 is a passive rotating shaft without power transmission. Therefore, the device is an independent unit. Under the condition of ensuring the upper-level transmission, the position can be fixed or moved on the frame through the air chamber shell mounting hole 312, which effectively improves the flexibility of the seeding device and facilitates the adjustment of the planting row spacing. The specific structural settings of the components are as follows.

[0041] The grooved wheel seed dispensing assembly 1 includes a seed box housing 101 installed on top of the pneumatic seed dispensing assembly 3 for material storage. The bottom of the seed box housing 101 is provided with a grooved wheel lower housing 104 for guiding material. An outer grooved wheel 106 for dispensing material is provided inside the grooved wheel lower housing 104. A grooved wheel shaft 103 for driving the outer grooved wheel 106 to rotate is provided in the middle of the outer grooved wheel 106. A bushing 102 installed on the grooved wheel lower housing 104 is movably connected to the outer side of the grooved wheel shaft 103. A retaining ring 105 for limiting the seed box housing 101 is provided on the outer side of the grooved wheel lower housing 104.

[0042] The pneumatic seed box assembly 2 includes two seed dispensing boxes 201 for guiding the material, and each seed dispensing box 201 is respectively arranged on both sides of the pneumatic seed dispensing assembly 3. The top of each seed dispensing box 201 is provided with a seed box cover 202 for blocking, and the seed box cover 202 is slidably connected to the seed dispensing box 201.

[0043] The pneumatic seed metering assembly 3 includes an air chamber housing 309 for guiding the material. The air chamber housing 309 is disposed between the lower housing 104 of the grooved wheel and the seed metering box 201. On both sides of the air chamber housing 309 are air chamber outer shells 301, which are respectively mounted on and connected to the corresponding seed metering boxes 201. Two brushes 302 are provided on the side of each of the two air chamber outer shells 301 facing the air chamber housing 309. Two seed metering toothed discs 30 are respectively disposed on both sides of the air chamber housing 309 and between the air chamber housing 309 and the air chamber outer shells 301. 3. A plane bearing 305 is provided on one side of the seed metering toothed disc 303. A seed dropping channel 311 for seed dropping is provided on the air chamber housing 309. Several seed suction holes 314 are opened through the seed metering toothed disc 303. A sealing edge 316 for sealing is provided on the outer side of the seed metering toothed disc 303. Two rotating shafts 307 for support are provided on the air chamber housing 309. A center hole 315 matching the rotating shaft 307 is opened in the middle of the seed metering toothed disc 303. One end of the rotating shaft 307 and located on one side of the seed metering toothed disc 303 is provided with a... A locking nut 304 is used to limit the positioning of the seed metering disc 303. A bearing 308 is provided on the outside of the rotating shaft 307 and inside the air chamber housing 309 to support the rotating shaft 307. The bearing 308 is movably connected to the rotating shaft 307, and a bearing end cap 306 is provided at one end of the bearing 308 on the outside of the rotating shaft 307. Air chamber housing mounting holes 312 for positioning are provided at both ends of the air chamber housing 309. A seed protection shell 313 is provided on one side of the inner wall of the seed metering disc 303. The interior of the air chamber housing 309 is provided with... There is a bearing mounting position 320 for mounting bearing 308. The bearing mounting position 320 is installed in the air chamber housing 309 by bolts 317. The outer side of the air chamber housing 309 is provided with a housing mounting hole 321 for mounting air chamber housing 301. The top of the air chamber housing 309 is provided with a Geneva assembly mounting hole 322 for mounting Geneva lower housing 104. The outer side of the air chamber housing 309 is provided with a negative pressure channel 318 for guiding flow. The inside of the air chamber housing 309 is provided with a negative pressure air chamber 319 that communicates with the negative pressure channel 318.

[0044] The transmission assembly 4 includes a first sprocket 401 mounted on the Geneva shaft 103, a main shaft 403 mounted on the outside of the air chamber housing 309 via a bearing housing 310, a second sprocket 402 mounted on one end of the main shaft 403, a third sprocket 406 mounted on the other end of the main shaft 403, a gear sleeve 404 mounted on the outside of the main shaft 403, and a limiting bearing seat 405 mounted on the main shaft 403 movably connected to the middle of the bearing housing 310.

[0045] This invention provides a control method applied to the aforementioned toothed disc type pneumatic mechanical combined seed metering device. The method includes the following steps:

[0046] Step 1: First, the staff installs the device on the seeder. The third sprocket 406 is driven to rotate and transmit power through the power mechanical output shaft, electric motor or ground wheel, etc. The second sprocket 402, gear sleeve 404 and main shaft 403 rotate in the W direction. The seed metering toothed disc 303 rotates around the rotating shaft 307 under the meshing of the gear sleeve 404 and the seed metering toothed disc 303 on the same side. The second sprocket 402 drives the first sprocket 401 to rotate through the chain, so that the outer grooved wheel 106 rotates in the seed box housing 101 and the grooved wheel lower housing 104.

[0047] Step 2: The seed metering toothed disc 303, which meshes with the main shaft 403, rotates in the W direction. When the seed suction hole 314 on the seed metering toothed disc 303 is connected to the negative pressure air chamber 319, the seeds flowing from the seed metering box 201 to the air chamber shell 301 and the seed metering toothed disc 303 are adsorbed into the seed suction hole 314 under the action of suction. At that time, as the seed metering toothed disc 303 rotates, when the seed suction hole 314 is disconnected from the negative pressure air chamber 319, the seeds fall under the action of gravity.

[0048] Step 3: When the seed metering discs 303 on both sides of the air chamber shell 309 are arranged symmetrically, each seeding occurs simultaneously on each seed metering disc 303. The seeding rate of the pneumatic seed metering assembly 3 can be changed by altering the meshing arrangement of each seed metering disc 303. During rotation, the outer grooved wheel 106 carries seeds through its surface grooves and passes through the seeding channel 311, allowing the seeds to converge with those seeded by the pneumatic seed metering assembly 3 during seeding. The seeding rate of the grooved wheel seed metering assembly 1 can be changed by varying the transmission ratio between the first sprocket 401 and the second sprocket 402. The seeding rate is maximized when each seed metering disc 303 and the outer grooved wheel 106 work simultaneously, and the seeding in each groove is synchronized with the seeding in each seed metering disc 303. The seeding rate is minimized when the outer grooved wheel 106 does not participate in the work and only the seed suction hole 314 on a single seed metering disc 303 participates in each seeding in the pneumatic seed metering assembly 3.

[0049] Step four: The sealing edge 316 slides within the air chamber housing 309, which reduces friction and resistance between the seed metering toothed disc 303 and the air chamber housing 309, and improves the airtightness between them. The seed metering toothed disc 303 rotates on the plane bearing 305 under meshing action. The rotating shaft 307 is a passive rotating shaft with no power transmission, which allows the device to be fixed or moved during installation through the mounting holes 312 in the air chamber housing while ensuring the transmission of the upper stage. This effectively improves the flexibility of the sowing device and facilitates the adjustment of the planting row spacing.

[0050] When using the above structure, the operator first installs the device on the seeder. The third sprocket 406 is driven to rotate and transmit power through the power mechanical output shaft, electric motor or ground wheel, etc. The second sprocket 402, gear sleeve 404 and main shaft 403 rotate in the W direction. The seed metering toothed disc 303 rotates around the rotating shaft 307 under the meshing of the gear sleeve 404 and the seed metering toothed disc 303 on the same side. The second sprocket 402 drives the first sprocket 401 to rotate through the chain, so that the outer grooved wheel 106 rotates in the seed box housing 101 and the grooved wheel lower housing 104.

[0051] When the seed metering toothed disc 303, which meshes with the main shaft 403, rotates in the W direction, and the seed suction hole 314 on the seed metering toothed disc 303 is connected to the negative pressure air chamber 319, the seeds flowing from the seed metering box 201 to the air chamber shell 301 and the seed metering toothed disc 303 are adsorbed into the seed suction hole 314 under the action of suction. At that time, as the seed metering toothed disc 303 rotates, when the seed suction hole 314 is disconnected from the negative pressure air chamber 319, the seeds fall under the action of gravity.

[0052] Furthermore, when the seed-dispensing toothed discs 303 on both sides of the air chamber shell 309 are arranged symmetrically, each seeding occurs simultaneously with the seeding of each seed-dispensing toothed disc 303. The seeding rate of the pneumatic seeding assembly 3 can be changed by altering the meshing arrangement of each seed-dispensing toothed disc 303. During rotation, the outer grooved wheel 106 carries seeds through the grooves on its surface and passes through the seeding channel 311, allowing the seeds to converge with the seeds sown by the pneumatic seeding assembly 3 during seeding. The seeding rate of the grooved wheel seeding assembly 1 can be changed by altering the different transmission ratios between the first sprocket 401 and the second sprocket 402. When each seed-dispensing toothed disc 303 and the outer grooved wheel 106 work simultaneously, and the seeding of each groove is synchronized with the seeding of each seed-dispensing toothed disc 303, the seeding rate can reach its maximum. When the outer grooved wheel 106 does not participate in the work and only the seed suction hole 314 on a single seed-dispensing toothed disc 303 participates in each seeding of the pneumatic seeding assembly 3, the seeding rate of the device is minimized.

[0053] When the sealing edge 316 slides within the air chamber housing 309, it reduces friction and resistance between the seed metering disc 303 and the air chamber housing 309, and improves the airtightness between them. The seed metering disc 303 rotates on the plane bearing 305 under meshing action. The rotating shaft 307 is a passive rotating shaft with no power transmission, allowing the device to be fixed or moved during installation via the air chamber housing mounting holes 312 while ensuring the transmission to the upper stage. This effectively enhances the flexibility of the sowing device and facilitates adjustment of the planting row spacing.

[0054] Unlike existing technologies, this application discloses a toothed disc type pneumatic mechanical combined seed metering device and its control method. Through the grooved wheel seed metering assembly 1, different working combinations can be formed with the pneumatic seed metering assembly 3. On the basis of the seeding rate adjustment advantage of the pneumatic seed metering assembly 3, the seeding rate adjustment range is further increased, overcoming the problem of large-scale hole seeding operation in the field with a single pneumatic seed metering device. The seed metering toothed disc 303 rotates on the plane bearing 305 under meshing action. The rotating shaft 307 is a passive rotating shaft without power transmission. Therefore, the device is an independent unit. Under the condition of ensuring the upper-level transmission, the position can be fixed or moved on the frame through the air chamber shell mounting hole 312, which effectively improves the flexibility of the seeding device and facilitates the adjustment of planting row spacing.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A toothed disc type pneumatic mechanical combined seed metering device, characterized in that: It includes a Geneva wheel seed metering assembly (1), a pneumatic seed box assembly (2), a pneumatic seed metering assembly (3), and a transmission assembly (4), wherein the Geneva wheel seed metering assembly (1) is mounted on the top of the pneumatic seed metering assembly (3); The grooved wheel seeding assembly (1) includes a seed box housing (101) installed on top of the pneumatic seeding assembly (3) and used for material storage. The bottom of the seed box housing (101) is provided with a grooved wheel lower housing (104) for guiding material. The interior of the grooved wheel lower housing (104) is provided with an outer grooved wheel (106) for discharging material. The pneumatic seed box assembly (2) includes two seed dispensing boxes (201) for guiding materials, and each seed dispensing box (201) is respectively arranged on both sides of the pneumatic seed dispensing assembly (3); The pneumatic seed metering assembly (3) includes an air chamber housing (309) for guiding the material. The air chamber housing (309) is disposed between the lower housing (104) of the groove wheel and the seed metering box (201). Both sides of the air chamber housing (309) are provided with air chamber outer shells (301) respectively installed on and connected to the corresponding seed metering boxes (201). Two brushes (302) are provided on the side of each of the two air chamber outer shells (301) facing the air chamber housing (309). Two seed metering toothed discs (303) are respectively disposed on both sides of the air chamber housing (309) and between the air chamber housing (309) and the air chamber outer shells (301). A planar bearing (305) is provided on one side of the air chamber housing (309), a seed dropping channel (311) for dropping seeds is provided on the air chamber housing (309), a plurality of seed suction holes (314) are provided through the seed dispensing toothed disc (303), a sealing edge (316) for sealing is provided on the outer side of the seed dispensing toothed disc (303); a negative pressure channel (318) for guiding flow is provided on the outer side of the air chamber housing (309), and a negative pressure air chamber (319) connected to the negative pressure channel (318) is provided inside the air chamber housing (309); the seed dropping channel (311) enables the seeds dropping from the groove of the outer groove wheel (106) and the seeds dispensing from the pneumatic seed dispensing assembly (3) to converge during the dropping process; When the seeding toothed discs (303) on both sides of the air chamber shell (309) are arranged symmetrically, each seeding toothed disc (303) drops seeds simultaneously. The seeding amount of the pneumatic seeding assembly (3) can be changed by changing the meshing arrangement of each seeding toothed disc (303). When each seeding toothed disc (303) and the outer groove wheel (106) work simultaneously, the seeding in the groove is synchronized with the seeding of each seeding toothed disc (303), and the seeding amount is the largest. When the outer groove wheel (106) does not participate in the work and only the seed suction hole (314) on a single seeding toothed disc (303) participates in each seeding of the pneumatic seeding assembly (3), the seeding amount is the smallest.

2. The toothed disc type pneumatic mechanical combined seed metering device according to claim 1, characterized in that: The outer grooved wheel (106) is provided with a grooved wheel shaft (103) for driving the outer grooved wheel (106) to rotate; the transmission assembly (4) includes a first sprocket (401) provided on the grooved wheel shaft (103), a main shaft (403) is installed on the outside of the air chamber housing (309), a second sprocket (402) is provided at one end of the main shaft (403), a third sprocket (406) is provided at the other end of the main shaft (403), and a gear sleeve (404) is provided on the outside of the main shaft (403), the gear sleeve (404) meshing with the seed metering gear disc (303).

3. The toothed disc type pneumatic mechanical combined seed metering device according to claim 2, characterized in that: The outer side of the grooved wheel shaft (103) is movably connected to a bushing (102) installed on the lower housing (104) of the grooved wheel, and the outer side of the lower housing (104) of the grooved wheel is provided with a retaining ring (105) for limiting the seed box housing (101).

4. The toothed disc type pneumatic mechanical combined seed metering device according to claim 2, characterized in that: Both seed boxes (201) are provided with seed box covers (202) for partitioning on the top, and the seed box covers (202) are slidably connected to the seed boxes (201).

5. A toothed disc type pneumatic mechanical combined seed metering device according to claim 2, characterized in that: The air chamber housing (309) is provided with two rotating shafts (307) for support, and the seed metering toothed disc (303) has a central hole (315) that matches the rotating shafts (307) in the middle.

6. A toothed disc type pneumatic mechanical combined seed metering device according to claim 5, characterized in that: A locking nut (304) for limiting the seeding tooth disc (303) is provided at one end of the rotating shaft (307) and on one side of the seeding tooth disc (303). A bearing (308) for supporting the rotating shaft (307) is provided on the outside of the rotating shaft (307) and inside the air chamber housing (309).

7. A toothed disc type pneumatic mechanical combined seed metering device according to claim 6, characterized in that: The bearing (308) is movably connected to the rotating shaft (307), and one end of the bearing (308) is provided with a bearing end cover (306) on the outside of the rotating shaft (307). Both ends of the air chamber housing (309) are provided with air chamber housing mounting holes (312) for positioning. One side of the inner wall of the seed metering toothed disc (303) is provided with a seed protection shell (313). The inside of the air chamber housing (309) is provided with a bearing mounting position (320) for mounting the bearing (308). The bearing mounting position (320) is installed in the air chamber housing (309) by bolts (317). The outside of the air chamber housing (309) is provided with a shell mounting hole (321) for mounting the air chamber outer shell (301). The top of the air chamber housing (309) is provided with a grooved wheel assembly mounting hole (322) for mounting the grooved wheel lower shell (104).

8. A toothed disc type pneumatic mechanical combined seed metering device according to claim 2, characterized in that: A main shaft (403) is mounted on the outside of the air chamber housing (309) via a bearing housing (310), and a limiting bearing seat (405) mounted on the main shaft (403) is movably connected to the middle of the bearing housing (310).

9. A control method applied to the toothed disc pneumatic mechanical combined seed metering device according to any one of claims 2-8, characterized in that: The method includes the following steps: Step 1: The third sprocket (406) is driven to rotate by the power drive mechanism and transmits power. The second sprocket (402), gear sleeve (404) and main shaft (403) rotate in the W direction. The second sprocket (402) drives the first sprocket (401) to rotate through the chain, so that the outer grooved wheel (106) rotates in the seed box housing (101) and the lower grooved wheel housing (104). Step 2: When the seed suction hole (314) is connected to the negative pressure air chamber (319), the seeds flowing from the seed metering box (201) to the air chamber shell (301) and the seed metering toothed disc (303) are adsorbed into the seed suction hole (314) under the action of suction. At that time, as the seed metering toothed disc (303) rotates, when the seed suction hole (314) is disconnected from the negative pressure air chamber (319), the seeds fall under the action of gravity. Step 3: By changing the meshing arrangement of each seed metering toothed disc (303), the seeding rate of the pneumatic seed metering assembly (3) can be changed. The seed drop channel (311) can make the seeds dropped in the groove of the outer groove wheel (106) and the seeds released by the pneumatic seed metering assembly (3) converge when the seeds are dropped. The seeding rate of the groove wheel seed metering assembly (1) can be changed by the different transmission ratio between the first sprocket (401) and the second sprocket (402). Step 5: When each seeding tooth disc (303) and outer groove wheel (106) work simultaneously, the seed dropping in the groove is synchronized with the seed dropping of each seeding tooth disc (303), and the seeding amount is the largest; when the outer groove wheel (106) does not participate in the work and only the seed suction hole (314) on a single seeding tooth disc (303) participates in each seed dropping of the pneumatic seeding assembly (3), the seeding amount is the smallest.

Images