CN114868492B - Movable seed guide tube of seed metering device - Google Patents
Movable seed guide tube of seed metering device Download PDFInfo
- Publication number
- CN114868492B CN114868492B CN202210521438.9A CN202210521438A CN114868492B CN 114868492 B CN114868492 B CN 114868492B CN 202210521438 A CN202210521438 A CN 202210521438A CN 114868492 B CN114868492 B CN 114868492B
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- pipe body
- seed
- driving mechanism
- upper pipe
- push rod
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- 230000007246 mechanism Effects 0.000 claims abstract description 53
- 238000009331 sowing Methods 0.000 claims abstract description 17
- 230000009471 action Effects 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 235000013339 cereals Nutrition 0.000 description 5
- 238000000926 separation method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C7/00—Sowing
- A01C7/20—Parts of seeders for conducting and depositing seed
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C7/00—Sowing
- A01C7/20—Parts of seeders for conducting and depositing seed
- A01C7/206—Seed pipes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Sowing (AREA)
Abstract
The invention provides a movable seed guide tube of a seed metering device, which comprises: the device comprises an upper pipe body, a lower pipe body, a first driving mechanism, a second driving mechanism, a third driving mechanism and a horizontal bracket. The first driving mechanism is used for driving the pipe body to move along the horizontal direction; the second driving mechanism is used for driving the upper pipe body to rotate by taking the connecting point of the upper pipe body and the horizontal bracket as the center; the third driving mechanism is used for driving the lower pipe body to rotate by taking the connecting point of the upper pipe body and the lower pipe body as the center; the first driving mechanism, the second driving mechanism and the third driving mechanism adjust the action conditions of the upper pipe body and the lower pipe body according to the detection result of the sensor; the invention solves the problem of poor consistency of the grain distance of the seeds in the seed grooves caused by large incidence angle difference of the seeds injected into the seed guide pipe and different seed feeding angles when the seeds leave the seed guide pipe under different sowing speeds.
Description
Technical Field
The invention relates to the technical field of agricultural machinery, in particular to a movable seed guide tube of a seed metering device.
Background
The seeder is a common agricultural device and plays a vital role in the planting of crops such as wheat, corn and the like. The existing seeder has fixed position and shape of the seed guide pipe, and the incidence angle of seeds injected into the seed guide pipe is large in difference under different speeds, so that the seeds are easy to collide with the inner wall of the seed guide pipe to damage ordered seed flow; when the sowing speed is smaller, the included angle between the throwing track of the seeds leaving the seed guide tube and the vertical direction is smaller; when the sowing speed is high, the included angle between the throwing track of the seeds leaving the seed guide tube and the vertical direction is high. The difference of the incident angle of the seeds injected into the seed guide pipe and the throwing angle of the seeds leaving the seed guide pipe at different speeds can cause poor consistency of the grain distance of the seeds in the seed grooves, reduce the sowing quality and are not beneficial to the growth of the seeds.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a movable seed guide tube of a seed metering device.
A movable seed guide tube of a seed metering device, comprising: the device comprises an upper pipe body, a lower pipe body, a first driving mechanism, a second driving mechanism, a third driving mechanism and a horizontal bracket;
the outlet of the upper pipe body is movably butted with the inlet of the lower pipe body; the inlet of the upper pipe body is arranged right below the seed feeding port of the seed sowing device;
the first driving mechanism is used for driving the upper pipe body to move along the horizontal direction; the first driving mechanism is arranged on the frame;
the second driving mechanism is used for driving the upper pipe body to rotate by taking a connecting point A as a center, and the connecting point A is a hinge point of the upper pipe body and the horizontal bracket; the horizontal support is arranged in the horizontal guide rail of the frame in a protruding structure at one side.
The third driving mechanism is used for driving the lower pipe body to rotate by taking a connecting point B of the upper pipe body and the lower pipe body as a center;
the first driving mechanism, the second driving mechanism and the third driving mechanism adjust the action conditions of the upper pipe body and the lower pipe body according to the detection result of the sensor; the sensor is used for detecting the rotating speed of the seed metering device.
Further, as described above, the movable seed guide tube of the seed metering device, the first driving mechanism includes a first push rod that is horizontally disposed, one end of the first push rod is fixedly connected to the horizontal bracket, and the other end is fixedly connected to the frame.
Further, the movable seed guide tube of the seed metering device comprises a second push rod, one end of the second push rod is rotatably connected with the horizontal bracket, and the other end of the second push rod is hinged with the upper tube body.
Further, the movable seed guide tube of the seed metering device as described above, the third driving mechanism includes: a third push rod;
one end of the third push rod is rotatably connected with the fixed foot at the bottom of the upper pipe body, and the other end of the third push rod is movably connected with the lower pipe body.
Further, the movable seed guide tube of the seed metering device is stuck with a bendable thin wall on the front wall of the upper tube body, and the coverage range of the thin wall extends to the tail end of the lower tube body.
Further, the movable seed guide tube of the seed metering device, the fixed leg, the third push rod and the lower tube body form a triangle-like structure.
Further, when the advancing speed of the power machine is 2-12km/h, the horizontal displacement of the whole upper pipe body and the whole lower pipe body is 0-16 mm; the rotation angle of the upper pipe body in the clockwise direction is 0-5 degrees; the rotation angle of the lower pipe body along the anticlockwise direction is 0-12 degrees.
The beneficial effects are that:
according to the movable seed guide pipe of the seed metering device, the incidence angle difference of seeds injected into the seed guide pipe is reduced through the movement and the integral rotation of the seed guide pipe in the horizontal direction, and the seed casting angle is changed through changing the angle of the lower pipe body, so that the purpose of adjusting the action amplitude of the seed guide pipe according to the seed metering speed is realized, the drop points of the seeds in a seed ditch are kept consistent, and the grain spacing consistency under different sowing speeds is improved; therefore, the problems of poor uniformity of grain spacing of seeds falling in a seed ditch caused by large incidence angle difference of the seeds injected into the seed guide pipe and unordered collision and different seed feeding angles when the seeds leave the seed guide pipe under different sowing speeds are solved.
Drawings
FIG. 1 is a schematic view of a movable seed guide tube of the seed metering device of the present invention;
FIG. 2 is a high speed seed guide pose and low speed seed guide pose state diagram;
FIG. 3 is a schematic view of the structure of an upper tube body with a bendable thin wall attached;
reference numerals:
1-a sensor; 2-a seed sowing device; 3-a second pushrod; 4-upper pipe body; 41-front wall; 42-a rear wall; 5-bendable thin wall; 6-lower pipe body; 7-a furrow opener; 8-a third push rod; 9-fixing feet; 10-a frame; 11-a first push rod; 12-a horizontal bracket; 13-high speed seed guide tube pose; 14-low speed seed guide posture; 15-seed grooves.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the embodiment of the invention provides a movable seed guiding tube of a seed metering device, which comprises an upper tube body 4, a lower tube body 6, a first driving mechanism, a second driving mechanism, a third driving mechanism and a horizontal bracket 12;
the outlet of the upper pipe body 4 is movably butted with the inlet of the lower pipe body 6; the inlet of the upper pipe body 4 is arranged right below the seed feeding port of the seed metering device 2;
the first driving mechanism is used for driving the upper pipe body 4 to move along the horizontal direction; the first driving mechanism is mounted on the frame 10;
the second driving mechanism is used for driving the upper pipe body 4 to rotate by taking a connection point A of the upper pipe body 4 and the horizontal bracket 12 as a center; the horizontal bracket 12 is installed in a horizontal guide rail of the frame 10 in a protruding structure of one side; the horizontal guide rail is positioned at the frame 10 below the seed feeding port and at one side of the advancing direction, and the length of the horizontal guide rail is 20 cm; the function is to provide a mounting location for the horizontal support 12 and to limit the horizontal support 12 to only horizontal movement.
The third driving mechanism is used for driving the lower pipe body 6 to rotate by taking a connecting point B of the upper pipe body 4 and the lower pipe body 6 as a center;
the first driving mechanism, the second driving mechanism and the third driving mechanism regulate the action conditions of the upper pipe body 4 and the lower pipe body 6 according to the detection result of the sensor 1; the sensor 1 is used for detecting the rotating speed of the seed sowing device 2.
The connection point A is the connection point of the upper pipe body 4 and the horizontal bracket 12, namely the rotation center of the upper pipe body 4; the connection point B is the connection point of the upper pipe body 4 and the lower pipe body 6, namely the rotation center of the lower pipe body 6. The movable seed guide pipe of the seed metering device provided by the embodiment of the invention is arranged below the seed feeding port of the seed metering device, and seeds fed by the seed metering device are guided into the seed grooves.
Fig. 2 shows the position and posture of the seed guide under the condition of different seed discharging speeds, wherein the posture 14 of the low-speed seed guide shows the position and posture of the seed guide and the position track of the seed contact and separation of the seed guide at low speed, and the posture 13 of the high-speed seed guide shows the position and posture of the seed guide and the position track of the seed contact and separation of the seed guide at high speed; x is the horizontal distance between the projection of the position of the seeds separated from the seed metering disc and the falling point of the seed bed. When the seed metering speed is increased, on the basis of the extension action of the first driving mechanism, the second driving mechanism contracts to drive the upper pipe body 4 to rotate clockwise around the connecting point A of the horizontal bracket 12 and the upper pipe body 4, and the third driving mechanism contracts to drive the lower pipe body 6 to rotate anticlockwise around the connecting point B of the upper pipe body and the lower pipe body, so that the included angle between the lower pipe body 6 and the vertical direction is reduced, the included angle between the falling direction of the seeds sliding along the inner wall of the pipe body and the vertical direction is reduced, and the falling point of the seeds under different speeds is ensured to tend to coincide.
The movable seed guide pipe of the seed metering device provided by the invention has the following working principle:
the speed direction of the seeds separated from the seed metering disc is slightly changed (the speed is increased, the angle in the vertical direction is increased), the sowing speed is increased, if the seed guiding pipe is in a fixed state, the incidence angle of the seeds injected into the seed guiding pipe is larger, the seeds are easy to collide with the inner wall of the seed guiding pipe, and the follow-up bouncing or rolling movement difference of the seeds is increased; when the sowing speed is increased, the angle of the seeds in the vertical direction, which is separated from the seed sowing disc, is increased, the seeds are injected into the seed guide tube along the front wall 41 of the upper tube body 4 after the seeds act, the incidence angle of contact between the seeds and the seed guide tube is reduced, and the ejection angle is also reduced, and the ejection height is also reduced and is more attached to the tube wall; the moving direction of the seed guide tube is the reverse direction of the advancing direction of the power machine; the lower tube body 6 of the seed guide tube is in a state of larger angle in the vertical direction in the initial stage, so that the projecting track of the seeds is back (the advancing direction of the power machine is positive), the movement and rotation of the seed guide tube are integrated, the lower tube body 6 rotates in the vertical direction in the process of the movement to enable the projecting track of the seeds to move forward relatively, and the falling point of the seeds is kept consistent through the complementation among the integral movement, rotation and rotation of the seed guide tube and the rotation of the lower tube body 6.
The invention drives the seed guide pipe to move horizontally integrally through the first driving mechanism, and the second driving mechanism drives the seed guide pipe to rotate, so that the incidence angle difference of seeds injected into the seed guide pipe is reduced, the seeds are kept to be always contacted with the front wall of the seed guide pipe at different speeds, and the seed flow is attached to the front wall of the seed guide pipe. Therefore, seeds are injected into the seed guide pipe along the front wall of the seed guide pipe through the movement of the seed guide pipe in the horizontal direction and the rotation of the upper pipe body, the incidence angle of the contact position of the seed guide pipe and the seed guide pipe is reduced, the conditions that the incidence angle of the seeds injected into the seed guide pipe is large in change and is easy to collide with the inner wall of the seed guide pipe can be avoided, and the movement difference of the seeds is reduced.
In summary, the movable seed guide tube of the seed metering device provided by the invention is divided into the upper and lower parts (the upper tube body 4 and the lower tube body 6), and the seed guide tube can integrally move along the horizontal direction through the driving mechanism, and simultaneously, the whole body can rotate around the connection point of the upper tube body 4 and the horizontal bracket 12, and the lower tube body 6 can rotate around the bottom of the upper tube body 4. With the increase of the sowing speed, the whole seed guide pipe moves to the negative direction (the advancing direction of the power machine is positive) and rotates clockwise around the connecting point of the upper pipe body 4 and the bracket 12, so that the incidence angle of the contact position of the seeds and the pipe wall is reduced, and the larger the speed is, the larger the moving distance and the rotating angle are; simultaneously, along with the increase of the speed, the seed guiding pipe at the lower part rotates to the vertical direction, the casting angle of seeds is reduced, and the larger the speed is, the larger the rotation angle is. Therefore, the invention ensures that the drop points of seeds in the seed grooves are kept consistent through the integral horizontal movement, rotation and rotation of the lower pipe body, thereby improving the consistency of grain spacing under different sowing speeds.
Further, the first driving mechanism includes a first push rod 11 horizontally disposed, one end of the first push rod 11 is fixedly connected to the horizontal bracket 12, and the other end is fixedly connected to the frame 10. The second driving mechanism comprises a second push rod 3; one end of the second push rod 3 is rotatably connected with the horizontal bracket 12, and the other end is hinged with the upper pipe body 4. The third driving mechanism includes: a third push rod 8; one end of the third push rod 8 is rotatably connected with a fixed foot 9 at the bottom of the upper pipe body 4, and the other end of the third push rod is movably connected with the lower pipe body 6; the fixed feet 9 at the bottom of the upper pipe body 4 and the upper pipe body 4 are of an integral structure; the fixed leg 9, the third push rod 8 and the lower pipe body 6 form a triangle-like structure.
Further, as shown in fig. 3, a thin bendable wall 5 is attached to the front wall 41 of the upper pipe body 4, and the coverage of the thin bendable wall 5 extends to the end of the lower pipe body 6.
The upper pipe body 4 and the lower pipe body 6 are of an assembly structure, in the rotating process of the lower pipe body 6, discontinuous separation states can be formed on the wall surfaces of the upper pipe body and the lower pipe body, namely gaps exist, seeds can jump and collide when moving from the upper pipe body to the lower pipe body, and the movement of the seeds can be influenced; the bendable thin wall is utilized to enable the pipe walls of the upper pipe body and the lower pipe body to be in a continuous state, and the bendable thin wall can replace two pipe walls of the upper pipe body and the lower pipe body to be a new pipe wall.
When the advancing speed of the power machine is 2-12km/h, the horizontal displacement of the whole seed guide tube is 0-16mm, and the larger the speed is, the larger the displacement is; the rotation angle of the upper pipe body 4 in the clockwise direction is 0-5 degrees, and the larger the speed is, the larger the angle is; the rotation angle of the lower pipe body 6 in the anticlockwise direction is 0-12 degrees, and the larger the speed is, the larger the angle is. When the advancing speed of the power machine is in the speed range of 2-12km/h, the pipe body acts in the displacement angles, so that the movement of seeds in the seed guide pipe can be improved, and the grain distance uniformity of sowing can be improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A movable seed guide tube of a seed metering device, comprising: the device comprises an upper pipe body (4), a lower pipe body (6), a first driving mechanism, a second driving mechanism, a third driving mechanism and a horizontal bracket (12);
the outlet of the upper pipe body (4) is movably butted with the inlet of the lower pipe body (6); the inlet of the upper pipe body (4) is arranged right below the seed feeding port of the seed sowing device (2);
the first driving mechanism is used for driving the upper pipe body (4) to move along the horizontal direction; the first driving mechanism is arranged on the frame (10);
the second driving mechanism is used for driving the upper pipe body (4) to rotate by taking a connecting point A as a center, and the connecting point A is a hinge point of the upper pipe body (4) and the horizontal bracket (12); the horizontal bracket (12) is arranged in a horizontal guide rail of the frame (10) in a one-side protruding structure;
the third driving mechanism is used for driving the lower pipe body (6) to rotate by taking a connection point B of the upper pipe body (4) and the lower pipe body (6) as a center;
the first driving mechanism, the second driving mechanism and the third driving mechanism regulate the action conditions of the upper pipe body (4) and the lower pipe body (6) according to the detection result of the sensor (1); the sensor (1) is used for detecting the rotating speed of the seed sowing device (2);
wherein, a bendable thin wall (5) is stuck on the front wall (41) of the upper pipe body (4), and the coverage area of the thin wall (5) extends to the tail end of the lower pipe body (6).
2. The movable seed guide tube of the seed metering device according to claim 1, wherein the first driving mechanism comprises a first push rod (11) which is horizontally arranged, one end of the first push rod (11) is fixedly connected to a horizontal bracket (12), and the other end of the first push rod is fixedly connected to the frame (10).
3. The movable seed guide tube of the seed metering device according to claim 1, wherein the second driving mechanism comprises a second push rod (3), one end of the second push rod (3) is rotatably connected with the horizontal bracket (12), and the other end of the second push rod is hinged with the upper tube body (4).
4. The seed meter movable seed guide of claim 1, wherein the third drive mechanism comprises: a third push rod (8); one end of the third push rod (8) is rotatably connected with a fixed foot (9) at the bottom of the upper pipe body (4), and the other end of the third push rod is movably connected with the lower pipe body (6).
5. The movable seed guide tube of the seed metering device according to claim 4, wherein the fixed leg (9), the third push rod (8) and the lower tube body (6) form a triangle-like structure.
6. The movable seed guide tube of the seed metering device according to claim 1, wherein when the advancing speed of the power machine is 2-12km/h, the horizontal displacement of the whole upper tube body (4) and the lower tube body (6) is 0-16 mm; the rotation angle of the upper pipe body (4) along the clockwise direction is 0-5 degrees; the rotation angle of the lower pipe body (6) along the anticlockwise direction is 0-12 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210521438.9A CN114868492B (en) | 2022-05-13 | 2022-05-13 | Movable seed guide tube of seed metering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210521438.9A CN114868492B (en) | 2022-05-13 | 2022-05-13 | Movable seed guide tube of seed metering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114868492A CN114868492A (en) | 2022-08-09 |
| CN114868492B true CN114868492B (en) | 2023-09-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210521438.9A Active CN114868492B (en) | 2022-05-13 | 2022-05-13 | Movable seed guide tube of seed metering device |
Country Status (1)
| Country | Link |
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| CN (1) | CN114868492B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09329554A (en) * | 1996-06-11 | 1997-12-22 | Hitachi Ltd | Visual inspecting device for cylindrical inner surface |
| CN108142048A (en) * | 2018-03-26 | 2018-06-12 | 王友芳 | Corn drill with hard grain conductor |
| CN110063109A (en) * | 2019-05-28 | 2019-07-30 | 山东理工大学 | A kind of opposed belt is accurately charged seed device |
| CN110762199A (en) * | 2019-10-16 | 2020-02-07 | 山东理工大学 | Planar motion gear shifting device of electric push rod transmission |
| CN112772052A (en) * | 2020-12-29 | 2021-05-11 | 杨明芹 | Seeding depth-adjustable agricultural seeding device |
| CN113179714A (en) * | 2021-04-26 | 2021-07-30 | 农业农村部南京农业机械化研究所 | Airflow auxiliary type precision seeder |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7426894B2 (en) * | 2006-07-14 | 2008-09-23 | Great Plains Manufacturing, Inc. | Smooth flow seed tube for agricultural planters |
| US8513559B2 (en) * | 2010-12-23 | 2013-08-20 | Swa Holding Company, Inc. | Apparatus for applying wear coating in conduit elbows |
| CA2772603A1 (en) * | 2011-03-21 | 2012-09-21 | Decker Colony Farms Ltd. | Movable conveyor for loading a container |
-
2022
- 2022-05-13 CN CN202210521438.9A patent/CN114868492B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09329554A (en) * | 1996-06-11 | 1997-12-22 | Hitachi Ltd | Visual inspecting device for cylindrical inner surface |
| CN108142048A (en) * | 2018-03-26 | 2018-06-12 | 王友芳 | Corn drill with hard grain conductor |
| CN110063109A (en) * | 2019-05-28 | 2019-07-30 | 山东理工大学 | A kind of opposed belt is accurately charged seed device |
| CN110762199A (en) * | 2019-10-16 | 2020-02-07 | 山东理工大学 | Planar motion gear shifting device of electric push rod transmission |
| CN112772052A (en) * | 2020-12-29 | 2021-05-11 | 杨明芹 | Seeding depth-adjustable agricultural seeding device |
| CN113179714A (en) * | 2021-04-26 | 2021-07-30 | 农业农村部南京农业机械化研究所 | Airflow auxiliary type precision seeder |
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| Publication number | Publication date |
|---|---|
| CN114868492A (en) | 2022-08-09 |
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