CN101433140A - Mechanism for feeding vegetable seedlings through snake-coiling type full-automatic flexible disc stoup body - Google Patents
Mechanism for feeding vegetable seedlings through snake-coiling type full-automatic flexible disc stoup body Download PDFInfo
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- CN101433140A CN101433140A CNA2008101704919A CN200810170491A CN101433140A CN 101433140 A CN101433140 A CN 101433140A CN A2008101704919 A CNA2008101704919 A CN A2008101704919A CN 200810170491 A CN200810170491 A CN 200810170491A CN 101433140 A CN101433140 A CN 101433140A
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- rotating disk
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Abstract
The invention discloses a brand-new soft disc bowl body vegetable seedling automatic intake mechanism, which belongs to the category of agricultural planting machinery. The core of the invention relates to a big rotary disc with bowl holes. The disc surface is installed approximately vertically; and rotation axis of the disc forms an included angle of 10 to 20 degrees together with a horizontal line. The bowl holes are distributed in one or two snake coils. Two types of non-bowl-bottom three-plate 60-degree sector soft discs are used to cultivate the seedling; and then the soft discs are placed and spliced on the rotary disc and are automatically taken in by the machine. A disc pressing fork, a movable feeding entrance and a seedling guiding pipe fixed on a machine frame are arranged on the front face of the rotary disc; a serrated rack rail distributed according to a snake coil is arranged on the back of the rotary disc; a driving mechanism rides on the rack rail; and three cams arranged on a cam shaft of the driving mechanism respectively drive two seedling pushing pistons and the rotary disc rack rail through levers. The movable feeding entrance on the front face and the driving mechanism on the back are synchronized through a U-shaped mount. The driving force produced by a ground wheel is transferred to a tower type driven sprocket through a sprocket and a chain and then is directly transferred to the cam shaft of the driving mechanism through a flexible shaft.
Description
The invention discloses a kind of brand-new floppy disk alms bowl body dish seedling intake mechanism, belong to category of agricultural planting machinery.
The land for growing field crops dish seed mode of planting has three kinds: live, root-naked transplanting, potted-seedling transplanting.Live exist sowing quantity big, must artificial thinning, the seeding stage area very much not manageability, strive the not high shortcoming of crops for rotation, output with the continuous cropping crop, the trend of progressively being eliminated is arranged; The root-naked transplanting palpus is lifting, hello seedling manually, and also will step down from the stage of history than alive of conference influence to the coring damage; Show that according to interrelated data the more naked seedling of pot seedling beet output improves 30%, and sugar part increases in addition.Therefore, the transplanting of the alms bowl formula of dish seedling is trend of the times.
Make a general survey of the existing dish seedling planting machine feeding mode of having announced with Patent Office on the market, one people's of delegation manual individual plant feeding is arranged, manual many strain feedings of one people of delegation are divided successively by machine again feeds, the prefabricated disposable seedling dish of also useful vegetable fiber adopts the rice transplanter mode to feed, the too low and too busy to get away artificial seedling of feeding of preceding two kinds of automaticities, the higher and complicated China's actual conditions that do not meet of machine of a kind of disposable seedling dish cost in back.
Can grow seedlings with plastic floppy disk and directly place again on the machine by machine feeding automatically? the present invention has just solved this problem dexterously.
One, rotating disk: core of the present invention is a traffic cycle, and arrange by almost constant speed's helical rule the position, pot seedling hole on the rotating disk, and the feeding track in seedling hole is as a dish snake, the snakehead from the ophiruid of outmost turns to inner ring.The core of rotating disk (1) is not arranged the seedling hole, is used for installing rotation platform (8).The seedling bore portion of rotating disk forms the endless belt of a broad.If directly this endless belt integral body is made a floppy disk, because the intensity of floppy disk is limited, wants with the hands to connect the dribbling seedling and just take up and can only do floppy disk very little, influence work efficiency like that with regard to existing frequent shutdown to change dish.If this endless belt is divided into 6 parts, every part is the covering of the fan of 60 ° of central angles.If 6 covering of the fans are identical, then can splice feeding then with growing seedlings with a kind of floppy disk of pattern.As everyone knows, the radius of curvature of per two points is all inequality on the constant velocity spiral, can not accomplish that two covering of the fans are identical, therefore can not use constant velocity spiral.
The present invention adopts two groups of concentric semicircles line bunch amalgamations, and a left line bunch radius general formula is: R
A=2nd; The radius general formula of right-hand line bunch is: R
B=(2n-1) d.D is the diameter (bigger than alms bowl body diameter) of the diskette location that takies of each seedling alms bowl, and n is the number of turns.The left line bunch is moved down 1/2d, the right-hand line 1/2d that bunch moves up, then wired bunch just formed a coherent dish snake line.Getting former center is pivot, so just can have been fed continuously to inner ring by the outer ring.Again the left line bunch is divided into three sectors by 60 ° at its central angle, then three of left sectors are identical, are referred to as the A fan; Again right-hand line bunch is divided into three sectors by 60 ° at its central angle, three right-hand sectors are identical, are referred to as the B fan.We only need just can carry out growing seedlings and having fed continuously of pot seedling with two kinds of floppy disks (being A dish and B dish) now.It is such that concrete seedling alms bowl is arranged: at first be to be seedling alms bowl center line with above-mentioned lines, the arc length of left semicircle is 2nd, every fan arc length is 2nd/3, in like manner right-hand every fan arc length is (2n-1) d π/3, promptly arc length all contains common factor formula d π/3 on all sectors, and d π/3 approximate 1.046d, chord length and d that it is corresponding are very nearly the same, so the seedling alms bowl such as can adopt to arrange at arc length (d π/3) mode, promptly on the every fan camber line of left semicircle, arrange 2n alms bowl position on camber line, and on the every fan camber line of right semi-circle, arrange 2n-1 alms bowl position, that is to say, along dish snake line by the outer ring to inner ring revolution half-turn, the alms bowl figure place on every fan successively decrease 1 (as figure one).Arc length modes such as rotating disk employing drive: make the track of saw blade shape at the back side of rotating disk along the camber line in front, be referred to as rack rails (18), the pitch of sawtooth is d π/3.
But, because the spacing between per two adjacent camber lines is 2d, the result who arranges the alms bowl position like this be on the floppy disk every layout delegation with regard to empty delegation, so both uneconomical also unreasonable.Therefore, arrange that in every circle track two circle alms bowl positions become necessary.The present invention on former line bunch radius general formula basis difference+1/2d and-1/2d, i.e. R
A1=R
A+ 1/2d, R
A2=R
A-1/2d; R
B1=R
B+ 1/2d, R
B2=R
B-1/2d is as two alms bowl body center lines in the same circle.So just having formed in the front has two dish snake lines to be the alms bowl centerline hole, to have one to coil rotating disk (1) the layout general layout (as figure two) that the snake line is the rack rails line at reverse side.We allow alms bowl orifice ring band protrude rotating disk (1), and stick a circle iron plate (2) on the flange of inner ring and outmost turns, so that with fixing floppy disk (4) edge of magnetic rubber bar (3).
Two, top seedling piston and platen fork: directly piece together pendulum behind the breeding use floppy disk of making by two kinds of covering of the fans of A, B on rotating disk (1), so just saved the operation of artificial transfer pot seedling, but to from floppy disk, take out pot seedling with regard to some trouble, at first be that dish seedling fragility is without pulling, so can not adopt the mode of lifting seedlings.
The method that the present invention takes top seedling piston (37) (38) is set at the rotating disk back side ejects floppy disk (floppy disk seedling alms bowl is cup-shaped for the no end) with pot seedling, can when the seedling of top, make floppy disk break away from rotating disk (1) so again, just need be at a front platen fork of design (5) of rotating disk (1), in the seedling process of top, push down floppy disk, make it be close to rotating disk by platen fork (5).Platen fork (5) has three jaws, and the rear end all is fixed on the front end of " U " shape frame (12); There is arc-shaped recess the centre of jaw, is in order to reduce top seedling piston stroke; The front end of jaw is circular-arc, has transverse incision, is connecting the bar of putting a lodged plant upright (29) with the straight pin hinge.The bar (29) of putting a lodged plant upright is that a cross section is circular hollow metal tube, and front end flattens the back and is connected with platen fork hinge.When rotating disk (1) rotates, put a lodged plant upright bar (29) top of the Miao Yecong that has a down dip enters friction with it, make on the one hand and put a lodged plant upright bar (29) to platen fork (5) applying, the bar (29) of putting a lodged plant upright on the other hand lifts sagging seedling leaf and makes it upwards to put together, in order to avoid the upset and the whereabouts of influence below pot seedling; When rotating disk (1) stops, during the seedling of piston (37) top, the bar of putting a lodged plant upright (29) is pushed down at pot seedling and is outwards rotated, and abdicates space, pot seedling whereabouts; When pot seedling is ejected when the alms bowl baselap goes out platen fork (5) by piston (37), pot seedling falls under the deadweight effect, and the seedling body is the fulcrum upset with the bar of putting a lodged plant upright (29), and the alms bowl body is towards falling into feeding mouth (10), near the part seedling leaf and the piston end surface friction of rotating disk one side, thereby erase earth on it.
Three, turntable: rotating disk will feed pot seedling in rotation, and rotating shaft (6) and bearing (7) just must be arranged; Want to guarantee that rotating disk edge jitter amount in rotary course is little, will a platform (8) be set on rotating shaft (6), platform (8) and center of turntable zone is closely contacted to guarantee the steady of rotation; Fall by deadweight in order to allow pot seedling be ejected the back by top seedling piston (37) (38), with plane of rotor disc horizontal by 70 °---80 ° of left and right sides angles are installed, the rotating disk front is towards machine side surface, this just requires shaft centerline vertical with the direction of machine travel, and horizontal by 10 °---20 ° of left and right sides angles are installed on the frame (9).
Four, movable feeding mouth: directly deliver to the furrow plough rear after ejecting the floppy disk of alms bowl body dish seedling from rotating disk (1) with conduit.For avoiding long dish seedling leaf and the coring of making of distance impaired, the present invention will feed on the line of the below that a little is arranged on rotating disk (1) and center of turntable.Liftable feeding mouth (10) lifting with the lifting of feeding point, funnel shaped feeding mouth (10) guarantee that pot seedling falls into and lead seedling pipe (11) that the funnel horn mouth cooperates with the bar of putting a lodged plant upright (29) by stopping that Miao Ye sets upright alms bowl body decline posture.Feeding mouth is installed in " U " shape frame (12) front end, and " U " shape frame rear end is enclosed within on the support light beam (13) at rotating disk rear by the sleeve pipe sky, and light beam is fixed on the frame with bolt (14).There is a square key (15) in the keyway of light beam (13), to slide in the sleeve pipe, guarantees that sleeve pipe can slide up and down and can not rotate on light beam (13).Be with one heavy spring (16) on the light beam of sleeve pipe below, be used for offsetting the gravity of " U " shape frame (12) and feeding mouth (10).On the frame (9) of feeding mouth (10) below jacket-type is installed and leads seedling pipe (11), pipe the first half and feeding mouth (10) the latter half is overlapping, the rear of the straight-through furrow plough of outlet, the Gesture correction plate (17) that can adjust height and inclination angle is installed, the attitude when landing in order to adjust pot seedling at the rear of leading seedling pipe (11) afterbody.
Five, driving mechanism: driving mechanism has three big tasks, and the one, in a circulation, finish driving successively to upper and lower two top seedling pistons (37) (38); The 2nd, in a circulation, stir a tooth, and rotating disk (1) to lack actuation time, in order to avoid influence piston actuated to rotating disk rack rails (18); The 3rd, drive feeding mouth (10) and its synchronization lifting by " U " shape frame (12).The core of driving mechanism be one up and down two ends be bearing in camshaft (21) on the drive chassis (20) with bearing (19), two cams are last top seedling cam (23) and the following top seedling cams (22) that drive two top seedling pistons respectively up and down, by last top seedling lever (49) and following top seedling lever (47) top seedling power are delivered to separately piston tail respectively; Intermediate cam is rack drives cam (26), and power is by activation lever (48) stretching driving spring (50).Drive chassis (20) is clipped in rack rails (18) upper edge rack rails by two rollers (45) (46) that are enclosed within on the top seedling piston seat (43) (44) and moves; The rear end of drive chassis (20) slides up and down in a vertical slideway (31) lining with a pulley (30), and slideway (31) is fixed on the frame (9) by bolt (32).Pulley (30) is installed in the rear end of pulley yoke (33), and pulley yoke (33) is fixed on the left end of Handle axis (34), and Handle axis (34) is installed in the riser hole of drive chassis rear side, and the right-hand member of Handle axis (34) is equipped with handle (35).Drive chassis (20) is pushed down pulley yoke (33) with pulley spring (36), makes pulley (30) be close to slideway (31).The inner face of drive chassis (20) is equipped with two cover top seedling piston assemblies, and every cover is made up of top seedling piston (37) (38), piston spring (39) (40), spring base (41) (42), piston seat (43) (44) and roller (45) (46) etc.; Also have three levers and two important springs in the drive chassis: promptly go up top seedling lever (49), activation lever (48) and following top seedling lever (47), driving spring (50) and retainer spring (51), three levers are enclosed within lever bearing pin (52) with sleeve pipe sky successively and go up and can swing around axle.The front end of drive chassis (20) is enclosed within to support with a sleeve pipe sky pushes down " U " shape frame (12) to realize interlock with it on the light beam (13).
Six, transmission mechanism: transmission mechanism is made up of land wheel (53) and the drive sprocket of upward installing (54), chain (55), tower driven sprocket (56) and driving flexible axle (57).Power is by land wheel (53), and---------driven cone pulley (56)---flexible axle (57)---camshaft (21) changes the operation spacing in the rows by adjusting the position of chain (55) on driving and driven sprocket wheel to chain (55) to drive sprocket (54).
Narrate the course of work of the present invention below in conjunction with an embodiment:
One, grows seedlings
Spread plastic film in the nursery of leveling, lay out the plastic floppy disk (4) at the no end, dress soil, strickling, sowing, blinding fully draw wetly then by it at end irrigation on plastic membrance shallow water, grow at the dish seedling and should transplant when soon intersecting mutually.
Two, sabot
To direction of machine travel driving handle (35), make on the pulley (30) and move, the pressure that overcomes pulley spring (36) makes pulley (30) break away from slideway (31).Rotate counterclockwise drive chassis (20) around light beam (13) and make it to deviate from rack rails (18), at this moment rotating disk (1) can freely rotate so that sabot.The floppy disk seedling that cultivates by being loaded on respectively on the rotating disk (1) of A, B dish, and being carried out web with magnetic rubber bar (3) and fixes.Again drive chassis (20) is weighed spring (16) to pressing down with propping up on the compression light beam (13), clockwise rotate drive chassis (20), allow pulley (30) enter among the slideway (31), this moment release handle (35), drive chassis (20) is upspring under an effect of heavy spring (16), rotate counterclockwise rotating disk (1) then, rack rails (18) external end head is snapped among driving mechanism two rollers (45) (46).
Two, work
Machine marches forward under the traction of hauling machine, and land wheel (53) lands and rotates, and the drive sprocket on the land wheel (54) drives driven tower sprocket wheel (56) by chain (55), and tower sprocket wheel (56) drives driving snake (57) power is passed to camshaft (21).Tower sprocket wheel (56) whenever turns around, and camshaft (21) also turns around.During first half-turn, the lug boss of following top seedling cam (22) turns over rotating disk one side, compressing top seedling lever (47) down makes its tail end depress down top seedling piston (37), finish top seedling action, near at the end, this cam (22) lug boss turns over lever (47) lug boss, and piston is return under the elastic force effect of spring (39); Second half-turn then is that the lug boss of top cam (23) turns over rotating disk one side, last top seedling lever (49) tail end is depressed top seedling piston (38), finish top seedling action, near at the end, this cam (23) lug boss turns over lever (49) lug boss, and piston (38) is return under the elastic force effect of spring (40); In whole process, middle driving cam (26) flange rises gradually, its lifting activation lever lentamente (48) is with stretching driving spring (50), the tail end of lever (48) is upwarped, in the process of upwarping, the grasshopper leg (58) of tail end is owing to the obstruction that is subjected to rack rails (18) is folded, and the return spring on it (59) is compressed.When the peak of driving cam (26) acted on activation lever (48), grasshopper leg (58) made the tail end expansion under the effect of return spring (59), and the drive pin hook (60) of tail end is crossed rack rails (18) and entered next tooth when the tooth peak of nipper.When a whole circle soon finishes, driving cam (26) lug boss turns over activation lever (48) lug boss, activation lever (48) return under the effect of driving spring (50), the hook pin of tail end (60) hooks the next tooth of rack rails, pulling rearward promptly, the inclined-plane of rack rails (18) overcome retainer spring (61) elastic force the location hook pin (62) of retainer spring tail end is lifted, cross the tooth paddy that rack rails (18) tooth peak is positioned next tooth until it, the action of the next circulation of beginning.More than action goes round and begins again, and the pot seedling of floppy disk (4) lining on the rotating disk (1) is ejected one by one successively, and under the stopping of the bar of putting a lodged plant upright (29), pot seedling is turned into the posture that Miao Ye makes progress and falls into feeding mouth (10).After pot seedling enters funnel, the alms bowl body enters down and leads seedling pipe (11) under the interference effect of funnel, arrived the exit, under the effect of Gesture correction plate (17), pot seedling hypsokinesis and going out is because machine has the inertia that advances, when the moment that pot seedling lands, the seedling body is just upright, under the effect of trailing bar and press wheel, during pot seedling is planted securely and buried.Because drive chassis (20) straddles rack rails (18) and goes up work, along with its by the successively feeding of outer ring to inner ring, height in the work is constantly to raise, and its sleeve pipe is vacateed the position and is allowed " U " shape frame (12) drive feeding mouth (10) rising synchronously down in a heavy spring (a 16) effect, there is a platen fork (5) of being close to rotating disk (1) inboard of feeding mouth (10), plays the effect of pushing down floppy disk (4) when the seedling of top.
Three, finish
When whole dish pot seedling when all feeding finishes, drive chassis (20) also has been raised to peak, and rack rails has not at this moment had sawtooth on (18), and drive chassis (20) is in the end futile back and forth on sawtooth.But this moment, driving mechanism touched a remote control switch of rotating disk (1) reverse side, and the receiving system of hauling machine driver's cabin changes dish with buzzer and light prompt driver.At this moment, driver's hoisting machine stops and changes dish.
The multirow machine can be used same set of transmission mechanism, drives a power transmission shaft with tower sprocket wheel, drives each row cam respectively thereby drive many flexible axles with many group bevel gears on the axle.Because all rotating disk all is synchronous feeding, so the dish that changes of multirow machine also carries out at one time.
The invention has the advantages that:
1, floppy disk direct splicing feeding need not manually to shift pot seedling;
2, adopt the concentric semicircles line bunch to replace constant velocity spiral, realized the subregion of card and soft The simplification of dish kind has solved rotating disk and has always carried the big seedling that carries with single floppy disk of seedling amount Measure little contradiction;
3, totally feeding continuously of dish snake line mode overturned the commutator that traditional square plate feeds Concept makes mechanism become unusually simple;
4, floppy disk and back of the body top set seedling piston mode have solved machine and have got asking of seedling difficulty at the bottom of the no alms bowl Topic;
5, the gravity seedling mode that falls has been simplified fortune seedling device;
6, it is very short that the type of drive of spring return function makes the rotation time of rotating disk, solved two The timing problem that the coordination pot seedling ejects;
7, the straddle-type rack drives arc length such as had both solved and had driven and orientation problem, made again and drove Actuation mechanism can raise in dial rotation synchronously;
8, the introducing of " U " shape frame has guaranteed the synchronous of feeding mouth and top seedling piston;
9, the speed-changing chain transmission makes the adjustment spacing in the rows become very simple;
10, the application of flexible axle makes the position changeable of driven sprocket, and chain has guaranteed the maximum degree of freedom of driving mechanism simultaneously without regulating wheel.
Description of drawings:
Fig. 1: dish snake line of the present invention forms principle and single file seedling alms bowl layout;
Fig. 2: duplicate rows seedling alms bowl layout of the present invention and seedling dish burst;
Fig. 3: figure is partly cutd open in overlooking of one embodiment of the invention;
Fig. 4: one embodiment of the invention driving mechanism vertical view;
Fig. 5: one embodiment of the invention backsight complete section figure;
Fig. 6: complete section figure is looked on one embodiment of the invention left side;
Fig. 7: one embodiment of the invention driving mechanism operation principle schematic diagram;
Fig. 8: one embodiment of the invention transmission system schematic diagram;
Fig. 9: one embodiment of the invention platen fork and put a lodged plant upright bar left view and vertical view.
Claims (10)
1, a kind of rotating disc type intake mechanism of dish seedling transplanting machine is characterized in that the pot seedling on the rotating disk (1) arranges and feed track to be one or several continuous dish snake line;
2, by the intake mechanism of claim 1 regulation, it is characterized in that the dish snake line on the rotating disk (1) is by two groups of equally spaced semi-circular line bunch R
A=2nd π, R
B=(2n-1) d π, and with two groups of line bunch center lines mobile d/2 formed round about (n is the number of turns from inside to outside, and d is the occupy-place diameter of pot seedling on floppy disk);
3, by the intake mechanism of claim 1,2 defineds, it is characterized in that adopting d π/3 etc. arc length alms bowl position arrange with etc. the arc length rotating disk drive;
4, by the intake mechanism of claim 1,2 defineds, floppy disk shape and alms bowl hole site is characterized in that growing seedlings: two groups of semi-circular line of A, B bunch are divided into three covering of the fans respectively by 60 ° at its central angle, and serve as to coil according to floppy disk A dish and B at the bottom of two kinds of no alms bowls making with these two kinds of covering of the fan shapes and alms bowl hole site;
5,, it is characterized in that rotating disk (1) back side is provided with top seedling piston (37) (38) and driving mechanism (20) by the intake mechanism of claim 1 regulation;
6,, it is characterized in that rotating disk (1) front is provided with movable feeding mouth (10) and platen fork (5) by the intake mechanism of claim 1,2,3 regulations;
7,, it is characterized in that the positive movable feeding mouth (10) of rotating disk (1) links to each other with " U " shape frame (12) with the driving mechanism (20) at the back side, guarantees the synchronous of feeding mouth (10) and driving mechanism (20) by the intake mechanism of claim 1,2,5,6 regulations;
8, by the intake mechanism of claim 1,2,5 regulations, it is characterized in that the power that transmission device transmits being passed to driving mechanism by flexible axle (57);
9, by the intake mechanisms of claim 1,2,5 regulations, it is characterized in that having added in the power drive system tower sprocket wheel gear (54) (55) (56) thus being used for changing gearratio changes spacing in the rows.
10, by the dish seedling intake mechanism of claim 1 regulation, it is characterized in that card is horizontal by 70 °---80 ° of angles are installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101704919A CN101433140A (en) | 2008-11-05 | 2008-11-05 | Mechanism for feeding vegetable seedlings through snake-coiling type full-automatic flexible disc stoup body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101704919A CN101433140A (en) | 2008-11-05 | 2008-11-05 | Mechanism for feeding vegetable seedlings through snake-coiling type full-automatic flexible disc stoup body |
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| Publication Number | Publication Date |
|---|---|
| CN101433140A true CN101433140A (en) | 2009-05-20 |
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ID=40707901
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101704919A Pending CN101433140A (en) | 2008-11-05 | 2008-11-05 | Mechanism for feeding vegetable seedlings through snake-coiling type full-automatic flexible disc stoup body |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105359872A (en) * | 2014-08-19 | 2016-03-02 | 谢成海 | Combined full-automatic nutrition bowl making machine |
| CN106961895A (en) * | 2017-04-07 | 2017-07-21 | 湖南生物机电职业技术学院 | A kind of shedding mechanism and its application method for transplanting crop |
| CN111316799A (en) * | 2020-03-02 | 2020-06-23 | 温福辉 | Seedling tray carries green vegetable seedling auxiliary device |
-
2008
- 2008-11-05 CN CNA2008101704919A patent/CN101433140A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105359872A (en) * | 2014-08-19 | 2016-03-02 | 谢成海 | Combined full-automatic nutrition bowl making machine |
| CN106961895A (en) * | 2017-04-07 | 2017-07-21 | 湖南生物机电职业技术学院 | A kind of shedding mechanism and its application method for transplanting crop |
| CN111316799A (en) * | 2020-03-02 | 2020-06-23 | 温福辉 | Seedling tray carries green vegetable seedling auxiliary device |
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Open date: 20090520 |