CN201919327U - Seed-metering device of corn precision seed sowing machine - Google Patents
Seed-metering device of corn precision seed sowing machine Download PDFInfo
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- CN201919327U CN201919327U CN2011200475267U CN201120047526U CN201919327U CN 201919327 U CN201919327 U CN 201919327U CN 2011200475267 U CN2011200475267 U CN 2011200475267U CN 201120047526 U CN201120047526 U CN 201120047526U CN 201919327 U CN201919327 U CN 201919327U
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- side cover
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- dish
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Abstract
The utility model provides a seed-metering device of a corn precision seed sowing machine. The seed-metering device comprises a first side cover, a second side cover, a first rotating shaft, a sowing plate, a seed sending plate and a separating board. the first rotating shaft penetrates the center of the sowing plate and drives the sowing plate to rotate, the seed sending plate and the sowing plate rotate synchronously, a plurality of seeding grooves are formed on the periphery of the sowing plate, a plurality of bar-shaped protrusions are arranged on the periphery of the seed sending plate, a plurality of seed sending grooves are formed on one side of the bar-shaped protrusions, the seeding grooves and the seed sending grooves are in one-one correspondance, the fixed separating board is arranged between the sowing plate and the seed sending plate; and a seed sending notch is formed at the upper part of the separating plate and allows seeds in the seed sending grooves to fall into the seeding grooves, and a seeding notch allowing seeds to fall is formed below the first side cover or the second side cover. The seed-metering device has an ingenious design and realizes accurate and adjustable precision seeding.
Description
Technical field
The utility model relates to a kind of sower seeding unit, the particularly a kind of corn precision sower seeding unit that can accurately sow.
Background technology
Precision drilling is a kind of advanced person's a kind method for planting, under the prerequisite that crop groups is fixed, can give full play to individual advantage, strengthens comprehensive resistance, reaches the purpose of high-quality, volume increase, synergy.The corn sowing seeds technology is to use machinery that quantitative breeding is broadcast into soil and earthing by line-spacing, spacing in the rows, the degree of depth of agriculture requirement, simultaneously the mechanized cultivation technology of deep placement base fertilizer.
The amount of broadcasting depends on the performance of seeding unit accurately, and seeding unit is the key core parts of corn precision sower with seeding unit.In the sowing process, seeding unit is separated seed from kind of case, forms finely dispersed seed flow, by grain tube seed is entered kind of a ditch.According to seeding principle difference, seeding unit mainly divides mechanical type, pneumatic type and Electromagnetically vibrating 3 big classes.The mechanical type seeding unit is used more disc type seeding unit and the nest eye Type Seed Metering Device etc. of mainly containing; The pneumatic type seeding unit divides 3 kinds of air-suction seeding unit, vapour-pressure type seeding unit and air-sweeping type seeding units again.Facts have proved, in use there is following shortcoming in above-mentioned several seeding unit: disc type and nest eye Type Seed Metering Device are strict to the size and dimension of seed, the seeding quality depends on kind of the situation of filling of type hole and nest eye, is fit to the single environment of seed category and uses; Pneumatic type seeding unit adaptability is stronger, and not tight to the size and dimension requirement of seed, seedling-damaging rate is little, and operating speed is higher, but its complex structure, the cost height, consumption of power is bigger, maintenance inconvenience.
Summary of the invention
The purpose of this utility model is to provide a kind of corn precision sower seeding unit, and existing sower is narrow with the range of application that seeding unit exists to solve, complex structure, manufacturing cost and the high problem of application cost.
In order to realize the purpose of this utility model, the corn precision sower that the utility model provides comprises first side cover, second side cover, first rotating shaft, seed tray, send kind a dish and a demarcation strip with seeding unit, and the edge of described first side cover and second side cover is connected to be combined into and holds described seed tray, send and kind coil and the cavity of demarcation strip; One end of described first rotating shaft is rotatable is located at described first side cover, and the other end extends described second side cover to receive the external impetus input; Described first rotating shaft is passed described seed tray center to drive described seed tray rotation, describedly send kind of a dish to be fixed in described first rotating shaft or be fixed on the described seed tray to rotate synchronously with described seed tray, described seed tray, send kind of dish and demarcation strip all in the form of annular discs, the periphery of described seed tray is provided with a plurality of planting tanks, the described periphery of kind of dish that send is provided with a plurality of strip projected parts, one side of described strip projected parts is provided with a plurality of kind of grooves that send, described planting tank is relative one by one with described kind of the groove that send, described demarcation strip is located at described seed tray and is sent between kind of the dish, and described demarcation strip is fixed on described first side cover or second side cover; The top of described demarcation strip be provided with one carry seed send kind of gap so that describedly send the seed in kind of the groove to fall into described planting tank, the below of described first side cover or second side cover is provided with the sowing gap of the seed that drops, described sending keeps at a certain distance away between kind of the dish and first side cover forming a seeds chamber that is used to hold seed, and described first side cover is provided with a seed input port that is used to import seed.
According to a kind of preferred implementation of above-mentioned corn precision sower with seeding unit, wherein, one side of described first side cover or second side cover is provided with a microscler gap along its periphery extension, and also be provided with a location-plate on described first side cover or second side cover, described location-plate is corresponding with described microscler gap, and described location-plate is provided with locating hole or long arc-shaped holes of a plurality of arc shootings; The side-lower of described demarcation strip is provided with a tailgate, and described tailgate is fixed in one of described a plurality of locating holes or described long arc-shaped holes by securing member.
According to a kind of preferred implementation of above-mentioned corn precision sower with seeding unit, wherein, described first side cover below is provided with a sowing port that is used to discharge the residue seed.
The utility model mainly comprises the seed tray be located in the cavity, send kind of dish and be located between the two with the demarcation strip with the two separation, send kind of disc spins to grasp the seed of set amount to cavity bottom, when rotating to a high position, seed is sent into the planting tank of seed tray by action of gravity by kind of the gap that send of demarcation strip, when seed tray rotates to low level, seed in its planting tank is taken advantage of a situation and is fallen into groove, thereby finishes seeding operation.This shows that the utility model can be applied to the seeding operation of multiple kinds of crops, and simple in structure, manufacturing and application cost is low, safeguard simple, stable performance.
Description of drawings
Fig. 1 is for using the corn precision sower stereochemical structure end view of the utility model preferred embodiment;
Fig. 2 is the stereochemical structure end view of the corn precision sower opposite side of application the utility model preferred embodiment shown in Figure 1;
Fig. 3 is the left cap structural representation of preferred embodiment shown in Figure 1;
Fig. 4 is the structural representation of the rotating shaft of preferred embodiment shown in Figure 1;
Fig. 5 is the structural representation of the seed tray of preferred embodiment shown in Figure 1;
Fig. 6 is the structural representation of the demarcation strip of preferred embodiment shown in Figure 1;
Fig. 7 is the plan structure schematic diagram that send kind of dish of preferred embodiment shown in Figure 1;
Fig. 8 is the main TV structure schematic diagram that send kind of dish of preferred embodiment shown in Figure 1;
Fig. 9 is the structural representation of the right cap of preferred embodiment shown in Figure 1;
Figure 10 is the structural representation of the location-plate of preferred embodiment shown in Figure 1;
Figure 11 is the structural representation of gearbox of the corn precision sower of application the utility model preferred embodiment shown in Figure 1;
Figure 12 is the height adjusting structure schematic diagram of press wheel of the corn precision sower of application the utility model preferred embodiment shown in Figure 1.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further details.
Fig. 1 and Fig. 2 schematically show the structure of the corn precision sower of using the utility model preferred embodiment, the corn precision sower of using the utility model preferred embodiment comprises a plurality of single body seeders that are fixed in frame 1, but the corn precision sower of application the utility model preferred embodiment also can only comprise a single body seeder.Need to prove at this, so that better show the wherein structure of a single body seeder, only show a single body seeder among Fig. 1 and Fig. 2 in order to simplify accompanying drawing.In addition, also be in order to simplify accompanying drawing, the Reference numeral of same parts is not shown among Fig. 1 and Fig. 2 simultaneously.
As depicted in figs. 1 and 2, the corn precision sower of using the utility model preferred embodiment comprises and is used for fixing the frame 1 that connects a plurality of single body seeders and side fertilizing mechanism, and each single body seeder comprises that frame 2, fertilizer can 22, seed-box 23, gearbox 3, transmission mechanism, the utility model preferred embodiment formed as the press wheel 4 of driving mechanism, by a plurality of sprocket wheels and chain reach the ditcher mechanism etc. of offering groove for seed.
Fertilizer can 22, seed-box 23, gearbox 3 all are located at frame 2 tops.The rotating shaft of press wheel 4 is connected in frame 2 by two stocks 24.The below of frame 2 is provided with a column 21, the place ahead of column 21 is provided with rotating shaft wheel 211 to prevent the weeds winding, the place ahead of column 21 lower ends is provided with ditching plow 222 and is used to offer groove, the both sides of ditching plow 222 extend back respectively a breast boards 223 are set, and the utility model preferred embodiment is sent into seed between two breast boardss 223.After ditching plow 222 is offered groove, breast boards 223 can better stop the earth of the groove both sides of offering to fall into groove, seed is sent into after the groove, and the earth of groove both sides then can freely fall into groove, and press wheel 4 has been broadcast groove into seed with earthing and compacting subsequently.
Please also refer to Fig. 1-shown in Figure 10, the utility model preferred embodiment that main body is positioned at breast boards 223 tops comprises left cap 62, right cap 61, rotating shaft 63, seed tray 65, send kind of a dish 67 and a demarcation strip 66, seed tray 65, send kind dish 67 and demarcation strip 66 all in the form of annular discs, the edge of left cap 62 and right cap 61 is connected to be combined into and holds seed tray 65, send and kind coil 67 and the cavity of demarcation strip 66.
The rotatable right cap 61 of being located at of one end of rotating shaft 63, the other end extends left cap 62 fixedlys connected with sprocket wheel 452, so that rotating shaft 63 is rotated synchronously with sprocket wheel 452.The hole 623 at seed tray 65 centers is passed in rotating shaft 63, and seed tray 65 is fixedlyed connected with rotating shaft 63 by this hole 623.
Send kind of a dish 67 to be fixed on the seed tray 65 to rotate synchronously with seed tray 65, as Fig. 5 and shown in Figure 7, seed tray 65 is provided with three screws 652, send kind correspondingly on the dish 67 to be provided with three through holes 674, can will send kind of a dish 67 to be fixed on the seed tray 65 by bolt or screw, so that the two synchronous rotation.In other embodiments, also can will send kind of a dish 67 to be fixed in the rotating shaft 63.
As shown in Figure 5, the periphery of seed tray 65 is provided with a plurality of planting tanks 651 equably.(simplify for the purpose of the accompanying drawing as Fig. 7 and Fig. 8, a strip projected parts 672 only is shown among Fig. 8) shown in, send kind of dish 67 to comprise disk body 671 and a plurality of strip projected parts 672 of annular, a plurality of strip projected parts 672 are located at the periphery of disk body 671, one side on strip projected parts 672 tops is provided with send kind of groove 673, when fixedly sending kind dish 67 on seed tray 65, planting tank 651 like this can be so that each send the seed in kind of the groove 673 to send into accordingly in each planting tank 673 with to send kind of groove 673 relative one by one.Further preferably, send kind of dish 67 integral body to be paw formula structure, evenly distributing 18 on the dish is similar to the strip projected parts 672 that finger is grabbed, and the tangent line of strip projected parts 672 and disk body 671 is 45 degree and tilts, and is 20 degree angles between the adjacent strip projected parts 672.Send kind of groove 673 to be V-structure, shape such as people's thumb and forefinger and be 120 degree angles, opening be towards seed tray 65, with demarcation strip 66 cooperations stably the clamping corn seed rotate.
When using, seed is sent into via conduit 6 the seed input port 611 on the right cap 61 from seed-box 23, be formed with a seeds chamber owing to send between kind of dish 67 and the right cap 61, in control conduit 6, under the situation of seeds fall speed, allow the storage small quantities of seed in this seeds chamber.Under the driving of sprocket wheel 452, seed tray 65 and send the rotation simultaneously of kind of dish 67, send kind of each strip projected parts 672 of dish 67 when rotating to low level, each send kind of groove 673 just to cooperate clamping one seed to rotate to a high position with demarcation strip 66, when rotating to a high position, run into kind of the gap that send of demarcation strip 66, owing to send the degree of depth of kind of groove 673 less, can not support seed, at this moment send the seed in kind of the groove 673 just to fall into the planting tank corresponding 651 with it owing to action of gravity.In this process, seed tray 65 and send kind of a dish 67 always doing synchronously to rotatablely move, planting tank 651 on the seed tray 65 continues rotation after a high position receives seed, when rotating to low level, again because action of gravity, seed in the planting tank 651 passes and falls into the groove that ditching plow 222 is offered, and then continues to rotate to the high-order seed that receives, so circulation.
The seed size difference of different crops, even the seed of same crops, because kind difference, its size is also inequality, during precision drilling, if need be accurate to each kind cave only allows to broadcast into a kind period of the day from 11 p.m. to 1 a.m, because sending kind of the size of sending kind of groove 673 of dish 67 fixes, change according to seed size and to send kind of dish 67 obviously and be unfavorable for seeding operation, for this reason, demarcation strip 66 can be regulated, for example the fixing hole on the tailgate 661 662 is fixed in the diverse location of the long arc-shaped holes 642 of location-plate 64, the height and position that send kind of gap 663 of demarcation strip 66 is just inequality, if seed is less, send kind of groove 673 may once grasp two seeds, after heightening the height that send kind of gap 663, accommodate these two seeds send kind of groove 673 to rotate to certain altitude the time, a seed wherein just falls into aforesaid seeds chamber, like this via send kind of gap 663 send in the planting tank 651 seed number remain one time one, if seed is bigger, send kind of groove 673 once can only grasp a seed, then can suitably turn down the height that send kind of gap 663.
For the seed that finishes is not sowed in emptying, right cap 61 belows are provided with a sowing port (not shown) that is used to discharge the residue seed, and this sowing port is positioned at right cap 61 near lower edge, so that emptying remains seed as far as possible.
In sowing, crops are carried out the side fertilising for convenience, the place ahead of frame 1 is provided with the adjustable column in a plurality of positions 16, the place ahead, column 16 lower end is provided with a ditching plow 162 respectively, and the rear of ditching plow 162 is respectively equipped with a fertilizer conveying pipe 163 that is connected with fertilizer can 22.The top of the place ahead of column 16 and ditching plow 162 is provided with a rotating shaft wheel 161 that can rotate freely, and is wrapped on the column 16 to prevent weeds.In order to prevent to burn kind, ditching plow 163 and ditching plow 222 not at grade, to form the side fertilization effect.
For the ease of adjusting the line-spacing of crops, each single body seeder can be adjusted its fixed position on frame 1, as depicted in figs. 1 and 2, is located at the position of the single body seeder of frame 1 one ends and can regulates and fix by screw rod 14. Sleeve 11 and 12 is sheathed on respectively on front and back two crossbeams of frame 1 slidably, connect by a connecting rod 13 between the two, sleeve 11 and 12, connecting rod 13 are formed a H shape structure, and column 16 is fixed on the sleeve 11 by U bolt 18, and frame 2 is fixed on the sleeve 12.One end of screw rod 14 is fixed in connecting rod 13, the other end passes the end connecting rod 15 of frame 1, so can screw rod be fixed in end connecting rod 15 by nut, when needing to adjust the crops line-spacing, again after the position of selected aforementioned H shape structure, again with screw rod 14 fixing getting final product.
In order to adjust the spacing in the rows of crops, the transmission mechanism of using the corn precision sower of the utility model preferred embodiment comprises the gearbox 3 that is used to regulate rotating shaft 63 rotating speeds.Gearbox 3 can be adjusted the rotating speed of rotating shaft 63, for example when the rotating speed of rotating shaft 63 reduces, seed tray 65 and the rotating speed reduction of sending kind of dish 67, the corn precision sower of the using the utility model preferred embodiment same segment distance that advances, the seed amount that send kind of dish 67 to grasp reduces, then the seed sowed of seed tray 65 also will reduce, so spacing in the rows increases; Otherwise then spacing in the rows reduces.
As Fig. 1, Fig. 2 and shown in Figure 11, the transmission mechanism of using the corn precision sower of the utility model preferred embodiment comprises a plurality of chains and a plurality of sprocket wheel, driving mechanism is a press wheel 4 of being located at frame 1 rear, and an end of the rotating shaft of press wheel is provided with the sprocket wheel that rotatablely moves 41 that is used to export press wheel 4.Sprocket wheel 41 is by chain 41 drive sprockets 42, and sprocket wheel 42 be same rotating shaft with sprocket wheel 43, and sprocket wheel 43 passes through chain 431 drive sprockets 44, and the main effect of sprocket wheel 44 is that the rotation by its rotating shaft is flowed out fertilizer smoothly.With sprocket wheel 43 coaxial also have a sprocket wheel by chain 432 drive sprockets 44, therefore this sprocket diameter does not show in Fig. 1 less than sprocket wheel 43.
Please specifically referring to Fig. 2 and Figure 11, the gearbox 3 of using the corn precision sower of the utility model preferred embodiment comprises sprocket wheel 44 and sprocket wheel 45, sprocket wheel 44 is located at an end of rotating shaft 37, be fixed with a plurality of driving gears 363,364,365 in the rotating shaft 37 with different-diameter, sprocket wheel 45 is located on the splined shaft 35 as another rotating shaft, can be provided with driven gear 361 axially slidably on the splined shaft 35, driven gear 361 is provided with keyway and together rotates with the driving that receives splined shaft 35.Driven gear 361 and driven gear 362 engagements, driven gear 361 and driven gear 362 are located between two clamping plate 34, respectively be provided with circular hole on two clamping plate 34 and pass for splined shaft 35, two clamping plate 34 rotatably be located on the splined shaft 35 so that driven gear 362 can with arbitrary driving gear 363,364,365 engagements.Arbitrary like this driving gear 363,364,365 can drive driven gears 361 by driven gear 362, and driven gear 361 drives splined shaft 35 rotations again, and then driving and splined shaft 35 coaxial sprocket wheels 45 rotate.
For convenience and stably make driven gear 362 and arbitrary driving gear 363,364,365 engagements, two clamping plate 34 are connected in one handle 32 simultaneously, handle 32 belows are provided with a projection 321, gearbox 3 is provided with the elongated hole 31 that passes and laterally slide for handle 32, is provided with a plurality of spacing holes 33 on the gearbox 3 and inserts for projection 321 below elongated hole 31.When needs driven gear 362 during with driving gear 363 engagements, then two clamping plate 34 are moved to the position corresponding with driving gear 363, then projection 321 is inserted in the locating hole 33 corresponding with driving gear 363.In order to increase stability, can be on handle 32 a sheathed compression spring, these compression spring one end butt two clamping plate 34, the inwall of other end butt gearbox 3.
In addition, two intermeshing driven gears 361,362 are set in two clamping plate 34 also have the function that changes driving gear 363,364,365 rotation directions, after rotation direction changes, the direction of rotation of the direction of rotation of seed tray 65 and advancing press wheel 4.To offset in the horizontal movement of this preferred embodiment direction of advance by the seed componental movement in the horizontal direction that the planting tank 651 of seed tray 65 falls, seed can fall into kind of a cave with the direction of near vertical like this, so this preferred embodiment can be put and spacing in the rows at more accurate control kind acupuncture point.
As Fig. 1, Fig. 2 and shown in Figure 12, the two ends of the rotating shaft of the press wheel 4 of the corn precision sower of application the utility model preferred embodiment are articulated in an end of a stock 24 respectively, the other end of stock 24 is articulated in frame 2, the middle part of two stocks 24 connects by quarter butt, the outside sheathed cylinder 54 of this quarter butt, the middle part of cylinder 54 is connected in an end of a vertical bar 55, and vertically the other end of bar 55 passes the mid portion of a U-shaped plate 56, and passes this end by a bayonet lock and prevent that it from coming off.These vertical bar 55 outside sheathed compression springs 551, an end of compression spring 551 is connected to cylinder 54, and the other end is connected to U-shaped plate 56.The vertical part of U-shaped plate 56 is passed a cross bar 53, and the middle part of cross bar 53 connects a screw rod 5, and screw rod 5 passes a nut (figure is unmarked) that is arranged in the frame tail end, and then passes a wing nut 51.The two ends of cross bar 53 are passed in the elongated hole 521 on the plate 52 of frame 2 tail end both sides, and at the two ends of cross bar 53 corresponding structure are set and prevent that cross bar 53 from horizontally slipping.Rotation wing nut 51 can drive screw 5 stretches out or pushes, and then order about cross bar 53 and move forward and backward, so by frame 2, stock 24, vertically the height on the leg-of-mutton frame 2 of the abstract structure formed of bar 55 is variable, and then the vertical distance between press wheel 4 and the frame 2 is adjustable as can be known, the embedded depth of ditching plow 222 will be adjustable like this, so can realize the adjustable of the planting seed degree of depth.
In sum, the utility model deft design, simple and practical, realized accurate and adjustable precision drilling.
As known by the technical knowledge, the utility model can be realized by other the embodiment that does not break away from its spiritual essence or essential feature.Therefore, above-mentioned disclosed embodiment with regard to each side, all just illustrates, and is not only.All in the utility model scope or the change that is being equal in the scope of the present utility model all be included in the utility model.
Claims (3)
1. corn precision sower seeding unit, it is characterized in that, comprise first side cover, second side cover, first rotating shaft, seed tray, send kind a dish and a demarcation strip, the edge of described first side cover and second side cover is connected to be combined into and holds described seed tray, send and kind coil and the cavity of demarcation strip;
One end of described first rotating shaft is rotatable is located at described first side cover, and the other end extends described second side cover to receive the external impetus input;
Described first rotating shaft is passed described seed tray center to drive described seed tray rotation, describedly send kind of a dish to be fixed in described first rotating shaft or be fixed on the described seed tray to rotate synchronously with described seed tray, described seed tray, send kind of dish and demarcation strip all in the form of annular discs, the periphery of described seed tray is provided with a plurality of planting tanks, the described periphery of kind of dish that send is provided with a plurality of strip projected parts, one side of described strip projected parts is provided with a plurality of kind of grooves that send, described planting tank is relative one by one with described kind of the groove that send, described demarcation strip is located at described seed tray and is sent between kind of the dish, and described demarcation strip is fixed on described first side cover or second side cover;
The top of described demarcation strip be provided with one carry seed send kind of gap so that describedly send the seed in kind of the groove to fall into described planting tank, the below of described first side cover or second side cover is provided with the sowing gap of the seed that drops, described sending keeps at a certain distance away between kind of the dish and first side cover forming a seeds chamber that is used to hold seed, and described first side cover is provided with a seed input port that is used to import seed.
2. corn precision sower seeding unit according to claim 1, it is characterized in that, one side of described first side cover or second side cover is provided with a microscler gap along its periphery extension, and also be provided with a location-plate on described first side cover or second side cover, described location-plate is corresponding with described microscler gap, and described location-plate is provided with locating hole or long arc-shaped holes of a plurality of arc shootings;
The side-lower of described demarcation strip is provided with a tailgate, and described tailgate is fixed in one of described a plurality of locating holes or described long arc-shaped holes by securing member.
3. corn precision sower seeding unit according to claim 1 is characterized in that, described first side cover below is provided with a sowing port that is used to discharge the residue seed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200475267U CN201919327U (en) | 2011-02-24 | 2011-02-24 | Seed-metering device of corn precision seed sowing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200475267U CN201919327U (en) | 2011-02-24 | 2011-02-24 | Seed-metering device of corn precision seed sowing machine |
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| Publication Number | Publication Date |
|---|---|
| CN201919327U true CN201919327U (en) | 2011-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200475267U Expired - Fee Related CN201919327U (en) | 2011-02-24 | 2011-02-24 | Seed-metering device of corn precision seed sowing machine |
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| CN (1) | CN201919327U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102668783A (en) * | 2012-05-30 | 2012-09-19 | 山东棉花研究中心 | Speed-regulating cotton seed tray |
| CN103503612A (en) * | 2013-09-11 | 2014-01-15 | 中国农业大学 | Airflow disturbance precision seed sowing device |
-
2011
- 2011-02-24 CN CN2011200475267U patent/CN201919327U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102668783A (en) * | 2012-05-30 | 2012-09-19 | 山东棉花研究中心 | Speed-regulating cotton seed tray |
| CN103503612A (en) * | 2013-09-11 | 2014-01-15 | 中国农业大学 | Airflow disturbance precision seed sowing device |
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Granted publication date: 20110810 Termination date: 20120224 |