CN107971225A - A kind of crop seeds pneumatic separation device for improving screening quality - Google Patents

A kind of crop seeds pneumatic separation device for improving screening quality Download PDF

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Publication number
CN107971225A
CN107971225A CN201711068319.8A CN201711068319A CN107971225A CN 107971225 A CN107971225 A CN 107971225A CN 201711068319 A CN201711068319 A CN 201711068319A CN 107971225 A CN107971225 A CN 107971225A
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CN
China
Prior art keywords
housing
pipe
inlet air
crop seeds
air plenum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711068319.8A
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Chinese (zh)
Inventor
贾杨博
Original Assignee
贾杨博
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 贾杨博 filed Critical 贾杨博
Priority to CN201711068319.8A priority Critical patent/CN107971225A/en
Publication of CN107971225A publication Critical patent/CN107971225A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/02Arrangement of air or material conditioning accessories
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06Feeding or discharging arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets

Abstract

The invention discloses a kind of crop seeds pneumatic separation device for improving screening quality, including base, housing, current divider, wind turbine and inlet air plenum;The current divider is arranged on the inner cavity top of housing;The assembling is located at the position on the left of housing, the suction opening connection exhaust column of wind turbine at the top of base, and the other end of exhaust column is connected to the left side of inlet air plenum;The inner cavity medium position of the inlet air plenum is provided with impeller;The top center of the impeller is fixed with shaft, and rotating disc is connected with the top of shaft, is symmetrically arranged with conflict bar different in size at left and right sides of the top of rotating disc, the top movable for contradicting bar is embedded with roller;The inner cavity lower part of the housing is provided with the sieve plate of elastic connection, and the lower surface of sieve plate and ball are inconsistent.The present invention solves the problems, such as that conventional air classification device can only be rejected in seed compared with light impurity, effectively improves the screening quality of crop seeds.

Description

A kind of crop seeds pneumatic separation device for improving screening quality
Technical field
The present invention relates to a kind of farm equipment, is specifically a kind of crop seeds pneumatic separation device for improving screening quality.
Background technology
Seed is gymnosperm and the distinctive brood body of angiosperm, it is formed by ovule by pollination fertilization.Seed one As be made of kind of a skin, embryo and 3 part of endosperm, the seeds of some plant maturations only kind of skin and embryo two parts.The formation of seed makes Immature sporophytic ovule obtains the protection of parent, and the nutriment of abundance is obtained as the fetus of mammal.Seed also has A variety of structures for being suitable for propagating or resisting bad condition, good condition is created for ethnic continue of plant.So in plant Phylogenetic process in seed plant can get the mastery instead of pteridophyte status.
Crop seeds need to be screened after harvest, so that the quality of overall seed is improved, existing common hand Section is screened using winnowing machine, but the dopant species contained in the seed due to just having harvested are more, and selection by winnowing often can only The impurity of shrivelled seed and some lighter weights is rejected, screening work well can not be played for the impurity of those heavier mass With screening is second-rate.
The content of the invention
It is an object of the invention to provide a kind of crop seeds pneumatic separation device for improving screening quality, to solve the above-mentioned back of the body The problem of being proposed in scape technology.
To achieve the above object, the present invention provides following technical solution:
A kind of crop seeds pneumatic separation device for improving screening quality, including base, housing, current divider, wind turbine and inlet air plenum;Institute State housing to design for open top formula, the bottom of housing is connected with inlet air plenum, and inlet air plenum is fixed on the top center of base; The current divider is arranged on the inner cavity top of housing, and current divider is connected by the internal chamber wall of annular slab and housing, and current divider includes Feeding cylinder and sub-feed tube, sub-feed tube are provided with the multiple and equidistant bottom for being connected to feeding cylinder, and the mouth of pipe of sub-feed tube is set downward; The assembling is located at the position on the left of housing at the top of base, the air outlet connection discharge pipe of wind turbine, discharge pipe it is another One end is connected to the left side central portion position of housing, and the junction of discharge pipe and housing is located at the lower section of isocon, the right side of housing The position of corresponding discharge pipe is connected with impurity removal pipe, and the other end of impurity removal pipe is provided with collecting bag;The suction opening connection of the wind turbine Exhaust column, the other end of exhaust column are connected to the left side of inlet air plenum;The inner cavity medium position of the inlet air plenum is provided with impeller, leaf Wheel deviation rear side is set, and reducer pipe is provided with the right side of the inner cavity of inlet air plenum, and the outer tube wall of reducer pipe and the internal chamber wall of inlet air plenum paste Close and fix, the blade of the slot face impeller of reducer pipe;The top center of the impeller is fixed with shaft, shaft pass through into Air compartment is simultaneously extend into housing, the bottom plate rotation connection of shaft and housing, and rotating disc, the top of rotating disc are connected with the top of shaft Conflict bar different in size is symmetrically arranged with left and right sides of portion, the top movable for contradicting bar is embedded with roller, and rotating disc is hollow out Formula designs;The rotating disc includes interior circle and outer ring body, and the periphery of interior circle is circumferentially fixed with multiple connecting rods, connecting rod it is another One end is connected with the internal ring wall of outer ring body;The inner cavity lower part of the housing is provided with sieve plate, is set at left and right sides of the lower section of sieve plate There is the transverse slat for being fixed on housing cavity wall, sieve plate connects transverse slat by flexible connector, and the lower surface of sieve plate and ball are inconsistent.
As the further scheme of the present invention:The sub-feed tube is flat tube body.
As the further scheme of the present invention:It is detachable connection between the collecting bag and impurity removal pipe.
As the further scheme of the present invention:The reducer pipe is eccentric reducer.
As the further scheme of the present invention:The connecting rod is provided with three in the periphery of interior circle.
As the further scheme of the present invention:The flexible connector is spring.
Compared with prior art, the beneficial effects of the invention are as follows:
At work, seed is added in feeding cylinder by the present invention, is then shunted and is fallen via sub-feed tube, so as to avoid what is fallen Seed is excessively intensive, influences selection by winnowing effect;It is shrivelled under the action of air-flow when seed falls on housing cavity medium position under Seed and the impurity of lighter weight are entered in collecting bag via impurity removal pipe, and then the seed after selection by winnowing is fallen on sieve plate;Wind During exhausting, the impeller being arranged in inlet air plenum can rotate machine under the drive of air-flow, and be additionally provided with reducer pipe, can To accelerate air-flow velocity, the rotating effect of impeller is improved;Turn disc is driven by shaft during wheel rotation, is rotated Its left and right sides conflict bar different in size can constantly contradict sieve plate during disk rotates, so that drive sieve plate to rock, into And the seed on sieve plate is further screened, the impurity of heavier mass is rejected, so as to improve screening quality;It is logical The rotating disc of hollow type design is crossed, on the one hand can be impacted to avoid the whereabouts to impurity, on the other hand can mitigate rotation The weight of disk, reduces rotary resistance.
Brief description of the drawings
Fig. 1 is the structure diagram for the crop seeds pneumatic separation device for improving screening quality.
Fig. 2 is the overlooking the structure diagram of inlet air plenum in the crop seeds pneumatic separation device for improve screening quality.
Fig. 3 is the structure diagram of rotating disc in the crop seeds pneumatic separation device for improve screening quality.
Fig. 4 is the enlarged structure schematic diagram of A in Fig. 1.
In figure:1- bases, 2- housings, 21- transverse slats, 3- current dividers, 31- annular slabs, 31- feeding cylinders, 32- sub-feed tubes, 4- Wind turbine, 41- discharge pipes, 42- exhaust columns, 5- impurity removals pipe, 6- collecting bags, 7- inlet air plenums, 71- reducer pipes, 8- impellers, 81- blades, 82- shafts, 9- rotating discs, circle, 92- outer ring bodies, 93- connecting rods, 94- contradict bar, 941- balls, 10- sieve plates, 101- in 91- Flexible connector.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work Embodiment, belongs to the scope of protection of the invention.
Please refer to Fig.1~4, in the embodiment of the present invention, a kind of crop seeds pneumatic separation device for improving screening quality, including Base 1, housing 2, current divider 3, wind turbine 4 and inlet air plenum 7;The housing 2 designs for open top formula, the bottom connection of housing 2 There is inlet air plenum 7, inlet air plenum 7 is fixed on the top center of base 1;The current divider 3 is arranged on the inner cavity top of housing 2, Current divider 3 is connected by annular slab 31 with the internal chamber wall of housing 2, and current divider 3 includes feeding cylinder 31 and sub-feed tube 32, sub-feed tube 32 The multiple and equidistant bottom for being connected to feeding cylinder 31 is provided with, the mouth of pipe of sub-feed tube 32 is set downward, further, sub-feed tube 32 For flat tube body, current divider 3 can shunt seed, so as to avoid the seed of whereabouts excessively intensive, influence selection by winnowing effect Fruit;
The wind turbine 4 is located at the position in the left side of housing 2 installed in the top of base 1, and the air outlet of wind turbine 4 connects discharge pipe 41, The other end of discharge pipe 41 is connected to the left side central portion position of housing 2, and discharge pipe 41 and the junction of housing 2 are located at isocon 32 Lower section, the position that the right side of housing 2 corresponds to discharge pipe 41 is connected with impurity removal pipe 5, and the other end of impurity removal pipe 5 is provided with collecting bag 6, it is detachable between collecting bag 6 and impurity removal pipe 5 further for collecting the impurity of shrivelled seed and some lighter weights Formula connects, easy to handle the impurity in collecting bag 6;
The suction opening connection exhaust column 42 of the wind turbine 4, the other end of exhaust column 42 are connected to the left side of inlet air plenum 7;It is described into The inner cavity medium position of air compartment 7 is provided with impeller 8, and the deviation rear side of impeller 8 is set, and during 4 exhausting of wind turbine, the meeting of impeller 8 exists Rotation is produced under the action of air-flow, reducer pipe 71 is provided with the right side of the inner cavity of inlet air plenum 7, further, reducer pipe 71 is bias Reducer pipe, the outer tube wall of reducer pipe 71 are bonded fixation, the leaf of the slot face impeller 8 of reducer pipe 71 with the internal chamber wall of inlet air plenum 7 Piece 81, by setting reducer pipe 71, accelerates air-flow velocity, improves the rotating effect of impeller 8;
The top center of the impeller 8 is fixed with shaft 82, and shaft 82 is through inlet air plenum 7 and extend into housing 2, shaft 82 are rotatablely connected with the bottom plate of housing 2, and the top of shaft 82 is connected with rotating disc 9, is symmetrically set at left and right sides of the top of rotating disc 9 Conflict bar 94 different in size is equipped with, the top movable for contradicting bar 94 is embedded with roller 941, and rotating disc 9 designs for hollow type, and one Aspect can impact to avoid the whereabouts to impurity, on the other hand can mitigate the weight of rotating disc 9, reduce rotary resistance;
The rotating disc 9 includes interior circle 91 and outer ring body 92, and the periphery of interior circle 91 is circumferentially fixed with multiple connecting rods 93, even The other end of bar 93 is connected with the internal ring wall of outer ring body 92, and further, connecting rod 93 is provided with three in the periphery of interior circle 91;
The inner cavity lower part of the housing 2 is provided with sieve plate 10, is provided with left and right sides of the lower section of sieve plate 10 and is fixed on 2 inner cavity of housing The transverse slat 21 of wall, sieve plate 10 connect transverse slat by flexible connector 101, and further, flexible connector 101 is spring, sieve plate 10 lower surface and ball 941 are inconsistent, when impeller 8 drives rotating disc 9 to rotate by shaft 82, the left and right sides of rotating disc 9 Conflict bar 94 different in size can constantly contradict sieve plate 10, so that drive sieve plate 10 to rock, and then to the seed on sieve plate 10 Further screened, the impurity of heavier mass is rejected, so as to improve screening quality.
The present invention operation principle be:
At work, seed is added in feeding cylinder 31 by the present invention, is then shunted and is fallen via sub-feed tube 32, so as to avoid down The seed fallen is excessively intensive, influences selection by winnowing effect;When seed falls on 2 inner cavity medium position of housing under, under the action of air-flow, Shrivelled seed and the impurity of lighter weight are entered in collecting bag 6 via impurity removal pipe 5, and then the seed after selection by winnowing falls to sieve plate On 10;During exhausting, the impeller 8 being arranged in inlet air plenum 7 can rotate wind turbine 4 under the drive of air-flow, and also set up There is reducer pipe 71, air-flow velocity can be accelerated, improve the rotating effect of impeller 8;Impeller 8 passes through 82 band of shaft during rotating Turn Moving plate 9 rotates, its left and right sides conflict bar 94 different in size can constantly contradict sieve plate during rotating disc 9 rotates 10, so as to drive sieve plate 10 to rock, and then the seed on sieve plate 10 is further screened, by the impurity of heavier mass into Row is rejected, so as to improve screening quality;The rotating disc 9 designed by hollow type, on the one hand can make to avoid the whereabouts to impurity Into influence, it on the other hand can mitigate the weight of rotating disc 9, reduce rotary resistance.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling Change is included in the present invention.Any reference numeral in claim should not be considered as to the involved claim of limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped Containing an independent technical solution, this narrating mode of specification is only that those skilled in the art should for clarity Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art It is appreciated that other embodiment.

Claims (6)

1. a kind of crop seeds pneumatic separation device for improving screening quality, including base(1), housing(2), current divider(3), wind turbine (4)And inlet air plenum(7);It is characterized in that, the housing(2)Designed for open top formula, housing(2)Bottom be connected with inlet air Room(7), inlet air plenum(7)It is fixed on base(1)Top center;The current divider(3)It is arranged on housing(2)Inner cavity on Portion, current divider(3)Pass through annular slab(31)With housing(2)Internal chamber wall connection, current divider(3)Including feeding cylinder(31)And sub-material Pipe(32), sub-feed tube(32)It is provided with multiple and is equidistantly connected to feeding cylinder(31)Bottom, sub-feed tube(32)The mouth of pipe downward Set;The wind turbine(4)Installed in base(1)Top be located at housing(2)The position in left side, wind turbine(4)Air outlet connection Discharge pipe(41), discharge pipe(41)The other end be connected to housing(2)Left side central portion position, discharge pipe(41)With housing(2) Junction be located at isocon(32)Lower section, housing(2)Right side correspond to discharge pipe(41)Position be connected with impurity removal pipe (5), impurity removal pipe(5)The other end be provided with collecting bag(6);The wind turbine(4)Suction opening connection exhaust column(42), exhaust column (42)The other end be connected to inlet air plenum(7)Left side;The inlet air plenum(7)Inner cavity medium position be provided with impeller(8), leaf Wheel(8)Deviation rear side is set, inlet air plenum(7)Inner cavity on the right side of be provided with reducer pipe(71), reducer pipe(71)Outer tube wall with into Air compartment(7)Internal chamber wall fitting fix, reducer pipe(71)Slot face impeller(8)Blade(81);The impeller(8)Top Portion center is fixed with shaft(82), shaft(82)Through inlet air plenum(7)And it extend into housing(2)In, shaft(82)With shell Body(2)Bottom plate rotation connection, shaft(82)Top be connected with rotating disc(9), rotating disc(9)Top at left and right sides of it is symmetrical It is provided with conflict bar different in size(94), contradict bar(94)Top movable be embedded with roller(941), rotating disc(9)To engrave Empty formula design;The rotating disc(9)Including interior circle(91)And outer ring body(92), interior circle(91)Periphery be circumferentially fixed with Multiple connecting rods(93), connecting rod(93)The other end and outer ring body(92)Internal ring wall be connected;The housing(2)Inner cavity lower part set It is equipped with sieve plate(10), sieve plate(10)Lower section at left and right sides of be provided with and be fixed on housing(2)The transverse slat of internal chamber wall(21), sieve plate (10)Pass through flexible connector(101)Connect transverse slat, sieve plate(10)Lower surface and ball(941)It is inconsistent.
2. the crop seeds pneumatic separation device according to claim 1 for improving screening quality, it is characterised in that the sub-material Pipe(32)For flat tube body.
3. the crop seeds pneumatic separation device according to claim 1 for improving screening quality, it is characterised in that the collection Bag(6)With impurity removal pipe(5)Between be detachable connection.
4. the crop seeds pneumatic separation device according to claim 1 for improving screening quality, it is characterised in that the reducing Pipe(71)For eccentric reducer.
5. the crop seeds pneumatic separation device according to claim 1 for improving screening quality, it is characterised in that the connecting rod (93)In interior circle(91)Periphery be provided with three.
6. the crop seeds pneumatic separation device according to claim 1 for improving screening quality, it is characterised in that the elasticity Connector(101)For spring.
CN201711068319.8A 2017-11-03 2017-11-03 A kind of crop seeds pneumatic separation device for improving screening quality Pending CN107971225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711068319.8A CN107971225A (en) 2017-11-03 2017-11-03 A kind of crop seeds pneumatic separation device for improving screening quality

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Application Number Priority Date Filing Date Title
CN201711068319.8A CN107971225A (en) 2017-11-03 2017-11-03 A kind of crop seeds pneumatic separation device for improving screening quality

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109041636A (en) * 2018-08-03 2018-12-21 贵州兴贵源酒业有限公司 The breeding method of Rosa roxburghii Tratt seedling
CN109092687A (en) * 2018-07-27 2018-12-28 陈景 A kind of preliminary exclusion device of sesame
CN111167718A (en) * 2019-12-31 2020-05-19 卜露露 Grain sieving mechanism of stone grain is sieved in selection by winnowing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203140314U (en) * 2013-03-23 2013-08-21 云南禾朴农业科技有限公司 Specific gravity selecting device of seed fine selecting machine
CN203862550U (en) * 2014-06-03 2014-10-08 石林禾泽蔬菜速冻加工厂 Grain winnowing machine
CN205393001U (en) * 2016-02-25 2016-07-27 荣曼玲 Crops seed wind selector
CN206373074U (en) * 2016-12-14 2017-08-04 长沙利诚种业有限公司 Seed wind filter device
CN207709381U (en) * 2017-11-03 2018-08-10 王霞 A kind of crop seeds pneumatic separation device improving screening quality

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203140314U (en) * 2013-03-23 2013-08-21 云南禾朴农业科技有限公司 Specific gravity selecting device of seed fine selecting machine
CN203862550U (en) * 2014-06-03 2014-10-08 石林禾泽蔬菜速冻加工厂 Grain winnowing machine
CN205393001U (en) * 2016-02-25 2016-07-27 荣曼玲 Crops seed wind selector
CN206373074U (en) * 2016-12-14 2017-08-04 长沙利诚种业有限公司 Seed wind filter device
CN207709381U (en) * 2017-11-03 2018-08-10 王霞 A kind of crop seeds pneumatic separation device improving screening quality

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109092687A (en) * 2018-07-27 2018-12-28 陈景 A kind of preliminary exclusion device of sesame
CN109092687B (en) * 2018-07-27 2021-06-15 陈景 Preliminary edulcoration device of sesame
CN109041636A (en) * 2018-08-03 2018-12-21 贵州兴贵源酒业有限公司 The breeding method of Rosa roxburghii Tratt seedling
CN109041636B (en) * 2018-08-03 2021-12-03 贵州志浩刺梨产业开发有限公司 Method for cultivating roxburgh rose seedlings
CN111167718A (en) * 2019-12-31 2020-05-19 卜露露 Grain sieving mechanism of stone grain is sieved in selection by winnowing

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Application publication date: 20180501