CN111247912A - Pressure stabilizer of pneumatic system of direct seeding machine - Google Patents

Pressure stabilizer of pneumatic system of direct seeding machine Download PDF

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Publication number
CN111247912A
CN111247912A CN202010215291.1A CN202010215291A CN111247912A CN 111247912 A CN111247912 A CN 111247912A CN 202010215291 A CN202010215291 A CN 202010215291A CN 111247912 A CN111247912 A CN 111247912A
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China
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shaft
shell
electromagnetic clutch
bearing
speed measuring
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CN202010215291.1A
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CN111247912B (en
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夏俊芳
刘博�
徐磊
程健
刘国阳
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Huazhong Agricultural University
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Huazhong Agricultural University
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soil Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Environmental Sciences (AREA)
  • Sowing (AREA)

Abstract

The invention discloses a pressure stabilizer of a pneumatic system of a direct seeding machine, which comprises a first conveying belt wheel connected with an air pump of the direct seeding machine, a first shaft of which the left end is connected with the first conveying belt wheel, a differential mechanism connected with the right end of the first shaft, an electromagnetic clutch connected with the differential mechanism through a second shaft, a one-way bearing sleeved on the second shaft and positioned on the left side of the electromagnetic clutch, a chain wheel connected with the electromagnetic clutch through a third shaft, a meshing gear meshed with a gear of the differential mechanism, a fourth shaft connected with an inner hole of the meshing gear, and a second conveying belt wheel connected with the fourth shaft, wherein the first conveying belt wheel is connected with the air pump of the direct seeding machine; the air pressure in the cavity of the pneumatic seed sowing device is always equal to or higher than a rated value, and the pneumatic seed sowing device is suitable for different pneumatic direct sowing machines and easy to maintain and overhaul.

Description

Pressure stabilizer of pneumatic system of direct seeding machine
Technical Field
The invention belongs to the technical field of agricultural machinery, and particularly relates to a pressure stabilizing device of a pneumatic system of a direct seeding machine.
Background
The positive pressure and the negative pressure generated by the air pump of the pneumatic direct seeding machine are determined by the rotating speed accessed by the air pump, in the actual work, the rotating speed change of the rear output shaft of the tractor is influenced due to the physical characteristic difference of the land surface and the soil, the operation of a manipulator, the load fluctuation of a unit and other factors, so that the working rotating speed of the air pump in the pneumatic system is unstable, the working air pressure of the seed sowing device is fluctuated, the seed sowing performance is reduced, and when the rotating speed is too low, the air pressure is too low, and the miss-seeding index is high.
Disclosure of Invention
The invention aims to solve the technical problems and provides a pressure stabilizer of a pneumatic system of a direct seeding machine, which enables the air pressure in a cavity of a pneumatic seed sowing device to be always equal to or higher than a rated value.
In order to achieve the purpose, the pressure stabilizing device of the pneumatic system of the direct seeding machine comprises a first conveying belt wheel connected with an air pump of the direct seeding machine, a first shaft of which the left end is connected with the first conveying belt wheel, a differential mechanism connected with the right end of the first shaft, an electromagnetic clutch connected with the differential mechanism through a second shaft, a one-way bearing sleeved on the second shaft and positioned on the left side of the electromagnetic clutch, a chain wheel connected with the electromagnetic clutch through a third shaft, a meshing gear meshed with the gear of the differential mechanism, a fourth shaft connected with an inner hole of the meshing gear, and a second conveying belt wheel connected with the fourth shaft; the speed measuring device comprises a first shaft, a speed measuring wheel, a speed measuring module shell, a magnet, a Hall element and a second shaft, wherein the speed measuring wheel and the speed measuring module shell covering the speed measuring wheel are arranged on the first shaft and between the first transmission pulley and a differential mechanism; the plane where the teeth of the speed measuring wheel are located is located between the two supporting plates inside the speed measuring module shell.
Furthermore, the interval between the plane where the teeth of the speed measuring wheel are located and any supporting plate is 1-10 mm.
Furthermore, the differential mechanism, the electromagnetic clutch and the one-way bearing are connected with the second shaft through keys, and the right side of the electromagnetic clutch is connected with a third shaft key; the fourth shaft passes through the key and links to each other with the hole of meshing gear, telescopic left side and third bearing contact telescopic right side and meshing gear contact, fourth bearing is connected to the fourth shaft right-hand member.
Further, still including installing second bearing that just is located between electromagnetic clutch and the sprocket on the third axle, be located first conveyer belt wheel with the first bearing between the tachometer wheel, just first bearing is located inside the module casing tests the speed.
Furthermore, a third bearing and a sleeve are sleeved on the fourth shaft.
The shell comprises a left end cover, a left shell, a right shell and a right end cover, wherein the left end cover is connected with the left shell through a bolt, the left shell is connected with the right shell through a bolt, and the right shell is connected with the right end cover through a bolt; in addition, a threaded hole in the left end cover is connected with the outer shell of the speed measuring module through a screw; the one-way bearing outer ring is in key connection with the right shell, and a fixed end of the electromagnetic clutch is connected with the right shell through a screw.
Compared with the prior art, the invention has the following advantages: the pressure stabilizing device of the pneumatic system of the direct seeding machine enables the air pressure in the cavity of the pneumatic seed sowing device to be always equal to or higher than a rated value, is suitable for different pneumatic direct seeding machines, is convenient to install and disassemble, assists in reducing the miss-seeding rate, and is long in service life and easy to maintain and overhaul.
Drawings
FIG. 1 is a schematic view of the internal structure of a pressure stabilizer of a pneumatic system of a direct seeding machine according to the present invention;
FIG. 2 is a schematic view of the overall structure of the pressure stabilizer of the pneumatic system of the direct seeding machine of the present invention;
FIG. 3 is a partially assembled view of FIG. 1;
fig. 4 is a schematic structural diagram of the housing of the speed measuring module in fig. 1.
In the figure: the speed measuring device comprises a first conveyor belt wheel 1, a second conveyor belt wheel 2, a first shaft 3, a first bearing 4, a speed measuring module shell 5 (wherein: a support plate 5.1), a speed measuring wheel 6, a differential mechanism 7, a second shaft 8, a one-way bearing 9, an electromagnetic clutch 10, a second bearing 11, a third shaft 12, a chain wheel 13, a fourth shaft 14, a third bearing 15, a sleeve 16, a meshing gear 17, a fourth bearing 18, a left end cover 19 (wherein: a threaded hole 19.1), a left shell 20 (wherein: a left hole 20.1), a right shell 21 (wherein: a right hole 21.1), a right end cover 22 and a direct seeding machine air pump 23.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
The pressure stabilizer of the pneumatic system of the direct seeding machine shown in figure 1 is arranged in the direction shown in figure 1 and comprises a first transmission belt wheel 1 connected with an air pump 23 of the direct seeding machine through a transmission belt, a first shaft 3 of which the left end is connected with the first transmission belt wheel 1 through a key, a differential mechanism 7 connected with the right end of the first shaft 3 through a key, an electromagnetic clutch 10 connected with the differential mechanism 7 through a second shaft 8, a one-way bearing 9 sleeved on the second shaft 8 and positioned at the left side of the electromagnetic clutch 10, a sprocket 13 connected to the electromagnetic clutch 10 through a third shaft 12, a second bearing 11 mounted on the third shaft 12 and located between the electromagnetic clutch 10 and the sprocket 13, a meshing gear 17 meshed with the gear of the differential 7, a second transmission pulley 2 connected to a fourth shaft 14 connected to an inner hole of the meshing gear 17 and connected to the fourth shaft 14 through a key, and a third bearing 15 and a sleeve 16 fitted over the fourth shaft 14; the speed measuring device comprises a first shaft 3, a speed measuring module shell 5, a first transmission pulley 1, a differential mechanism 7, a first bearing 4, a speed measuring wheel 6, a speed measuring module shell, a second bearing 6, a speed measuring module shell and a speed measuring module, wherein the first bearing 4 and the speed measuring wheel 6 are sequentially arranged on the first shaft 3 from left to right between the first transmission pulley 1 and the differential mechanism 7; the differential mechanism 7, the electromagnetic clutch 10 and the one-way bearing 9 are connected with the second shaft 8 through keys, and the right side of the electromagnetic clutch 10 is connected with the third shaft 12 through keys; the fourth shaft 14 is connected with an inner hole of the meshing gear 17 through a key, the left side of the sleeve 16 is in contact with the third bearing 15, the right side of the sleeve 16 is in contact with the meshing gear 17, and the right end of the fourth shaft 14 is connected with a fourth bearing 18.
As shown in fig. 2 and 3, the portable electronic device further comprises a housing, wherein the housing comprises a left end cover 19, a left housing 20 provided with a left hole 20.1, a right housing 21 provided with a right hole 21.1 and a right end cover 22, the left end cover 19 is connected with the left housing 20 through bolts, the left housing 20 is connected with the right housing 21 through bolts, and the right housing 21 is connected with the right end cover 22 through bolts; in addition, a threaded hole 19.1 in the left end cover 19 is connected with the outer shell 5 of the speed measuring module through a screw; the outer ring of the first bearing 4 is matched with the left shell 20, the outer ring of the one-way bearing 9 is in key connection with the right shell 21, and the fixed end 10.1 of the electromagnetic clutch 10 is connected with the right shell 21 through a screw; the outer ring of the second bearing 11 is matched with the right shell 21, the outer ring of the third bearing 15 is matched with the left shell 20, and the outer ring of the fourth bearing 18 is matched with the left shell 20.
In actual work, the first conveying belt wheel 1 can be replaced by a synchronous belt wheel, a chain wheel and other transmission devices according to actual conditions; the chain wheel 13 can be replaced by a belt wheel, a gear, a universal joint and other transmission devices according to actual conditions; the chain wheel 13 is connected with the ground wheel of the direct sowing machine through a chain. The second transmission belt wheel 2 is connected with the power output by the rear power output shaft of the tractor through a transmission belt, and the second transmission belt wheel 2 can be replaced by a universal joint, a chain wheel and other transmission devices according to actual conditions.
Referring to fig. 4, two support plates 5.1 are arranged on the inner wall of the speed measuring module shell 5, a magnet is embedded in one support plate, a hall element is fixed on the other support plate, and the magnet and the hall element are arranged in an opposite manner; meanwhile, the tachometer wheel 6 comprises a cylinder with a key slot inside and a ring of teeth uniformly arranged on the surface of the cylinder, and the material of the teeth is iron. The plane that the tooth of tachometer wheel 6 was located the middle of two backup pads of module casing 5 inside that tests the speed, and the interval of the plane that the tooth of tachometer wheel 6 was located and arbitrary backup pad is 1 ~ 10 mm. The Hall element is connected with the single chip microcomputer through an electric wire, the single chip microcomputer is pasted outside the left shell 20, and the electric wire passes through the left hole 20.1; the electromagnetic clutch 10 is connected with the single chip microcomputer and the power supply through another two electric wires, and the two electric wires pass through the right hole 21.1.
The pressure stabilizer for the pneumatic system of the direct seeding machine is arranged at the front part of the direct seeding machine and below the air pump. In actual work, the installation position of the direct seeding machine can be adjusted according to actual conditions, such as the installation position is arranged on one side of the direct seeding machine, the chain wheel end faces the left side and the like.
When the pneumatic direct seeding machine works, firstly, the rated rotating speed of the air pump is obtained according to the optimal pressure of the inner cavity of the pneumatic seed sowing device used by the direct seeding machine, and the rated value omega of the rotating speed of the first shaft 3 is calculated according to the transmission ratio of the rotor of the air pump and the first shaft 3Forehead (forehead)Electromagnetic clutch10 is normally open. When the tractor is observed from the back of the tractor, the rotation direction of the power output by the tractor is clockwise, the power output by the tractor is connected to the fourth shaft 14 through the power output by the tractor, the fourth shaft 14 drives the meshing gear 17 to rotate, and the direction is clockwise when the tractor is observed from the direction of the second transmission belt wheel 2; the meshing gear 17 drives the gear on the differential mechanism 7 to rotate in the anticlockwise direction and the rotating speed is omegaInto. The real-time rotating speed output by the first shaft 3 at the left end of the differential 7 is omegaLeft side ofAnd the direction is anticlockwise, and the power is transmitted to the air pump of the direct seeding machine through the first shaft 3. The one-way bearing 9 on the second shaft 8 at the right end of the differential 7 can only allow the second shaft 8 to rotate clockwise and cannot rotate anticlockwise. At this time, the rotational speed of the second shaft 8 is 0, ωLeft side of＝2ωInto. The chain wheel 13 is connected with the ground wheel of the direct sowing machine, the rotating direction of the third shaft 12 is clockwise, and the rotating speed is omegaRight side。
When each tooth on the speed measuring wheel 6 passes through the right front of the Hall element, the magnetic flux density is changed, and the Hall element outputs a pulse signal; the first shaft 3 generates a certain amount of pulse signals every revolution, the pulse signals are input into the single chip microcomputer through electric wires, and the single chip microcomputer obtains the real-time monitoring rotating speed omega of the first shaft 3 by calculating the number of pulses entering every secondLeft side of。
Due to the physical property difference between the field surface and the soil, the operation of a manipulator, the load fluctuation of a unit and other factors, the rotating speed omega of the rear output shaft of the tractor is influencedIntoChange, and thus omegaLeft side ofThe change affects the air pump rotation speed.
When the singlechip detects omegaLeft side of>＝ωForehead (forehead)At this time, the electromagnetic clutch 10 is in the off state, ω left is 2 ω in.
When the singlechip detects omegaLeft side of<ωForehead (forehead)When, the electromagnetic clutch 10 is closed; the power of the third shaft 12 is input to the differential 7, in this case ωLeft side of＝2ωInto+ωRight sideSo that omegaLeft side of>＝ωForehead (forehead). With the electromagnetic clutch 10 closed, if ω still occursLeft side of<ωForehead (forehead)The tractor rear power output speed is manually adjusted. Electric powerAfter the clutch 10 is closed, if ω occursLeft side of>ωForehead (forehead)+ω0For 2 seconds, where ω0＝1/10×ωForehead (forehead)The electromagnetic clutch 10 is turned off, so that ωLeft side of＝2ωInto。
This is repeated.
Requirement of transmission ratio of rotation speed of the third shaft 12 to rotation speed of the land wheel: when the tractor drives the direct seeding machine to work, the rated rotating speed of the rear power output of the tractor is omegaIncome amountThe rotation speed of the rear power output of the tractor fluctuates within a certain range under the factors of physical property difference between the field surface and the soil, manipulator operation, unit load fluctuation and the like, and the minimum rotation speed is set to be omegaGo into smalllyLet Δ be ωIncome amount-ωGo into smallly. The rotating speed of the ground wheel of the direct seeding machine is omegaGroundThe rotation speed of the ground wheel also fluctuates within a certain range under the influence of external environment, and the minimum rotation speed of the ground wheel during working is set as omegaSmall floorThe rotating speed of the shaft 12 of the ground engaging wheel power is omegaRight shaftLet the transmission ratio of the two be
Figure BDA0002424189610000051
The rotating speed of the left side shaft 3 of the differential is omegaLeft side ofRated value of omegaForehead (forehead). With the electromagnetic clutch 10 closed, ωRight shaft＝ωRight side. The following formula can be obtained:
ωleft side of＝2ωInto+ωRight side
ωLeft side of＞＝2ωGo into smallly+ωThe right small
ωLeft side of＞＝2(ωIncome amount-Δ)+ωThe right small
ωThe right small＜＝ωForehead (forehead)-2(ωIncome amount-Δ)
Figure BDA0002424189610000061
Can calculate the maximum value of lambda as
Figure BDA0002424189610000062
In practice, according to this transmission ratio λBig (a)And designing the transmission ratio of the shaft rotating speed of the power of the ground wheel to the rotating speed of the ground wheel. The transmission ratio lambda is changed by replacing a different type of sprocket 13.

Claims (6)

1. The utility model provides a living broadcast machine pneumatic system voltage regulator device which characterized in that: the device comprises a first conveying belt wheel (1) connected with an air pump (23) of a direct seeding machine, a first shaft (3) with the left end connected with the first conveying belt wheel (1), a differential mechanism (7) connected with the right end of the first shaft (3), an electromagnetic clutch (10) connected with the differential mechanism (7) through a second shaft (8), a one-way bearing (9) sleeved on the second shaft (8) and positioned on the left side of the electromagnetic clutch (10), a chain wheel (13) connected with the electromagnetic clutch (10) through a third shaft (12), a meshing gear (17) meshed with a gear of the differential mechanism (7), a fourth shaft (14) connected with an inner hole of the meshing gear (17) and a second conveying belt wheel (2) connected with the fourth shaft (14); the speed measuring device comprises a first shaft (3), a speed measuring wheel (6) and a speed measuring module shell (5) covering the speed measuring wheel (6), wherein the first shaft (3) is positioned between the first conveying wheel (1) and a differential mechanism (7), the inner wall of the speed measuring module shell (5) is provided with two supporting plates (5.1), a magnet is embedded in one supporting plate, a Hall element is fixed on one supporting plate, and the magnet and the Hall element are arranged in a manner of facing; the plane where the teeth of the speed measuring wheel (6) are located is located between the two supporting plates (5.1) inside the speed measuring module shell (5).
2. The pressure stabilizer of the pneumatic system of the direct seeding machine as claimed in claim 1, wherein: the interval between the plane where the teeth of the speed measuring wheel (6) are located and any supporting plate (5.1) is 1-10 mm.
3. The pressure stabilizer of the pneumatic system of the direct seeding machine as claimed in claim 1, wherein: the differential mechanism (7), the electromagnetic clutch (10) and the one-way bearing (9) are connected with the second shaft (8) through keys, and the right side of the electromagnetic clutch (10) is connected with a third shaft (12) through keys; fourth shaft (14) link to each other through the hole of key with meshing gear (17), the left side and the contact of third bearing (15) of sleeve (16), the right side and the contact of meshing gear (17) of sleeve (16), fourth bearing (18) are connected to fourth shaft (14) right-hand member.
4. The pressure stabilizer of the pneumatic system of the direct seeding machine as claimed in claim 1, wherein: still including installing second bearing (11) on third axle (12) and between electromagnetic clutch (10) and sprocket (13), be located first driving pulley (1) with first bearing (4) between tachometer wheel (6), just first bearing (4) are located inside module casing (5) tests the speed.
5. The pressure stabilizer of the pneumatic system of the direct seeding machine as claimed in claim 1, wherein: and a third bearing (15) and a sleeve (16) are sleeved on the fourth shaft (14).
6. The pressure stabilizer of the pneumatic system of the direct seeding machine as claimed in claim 1, wherein: the shell comprises a left end cover (19), a left shell (20), a right shell (21) and a right end cover (22), wherein the left end cover (19) is connected with the left shell (20) through a bolt, the left shell (20) is connected with the right shell (21) through a bolt, and the right shell (21) is connected with the right end cover (22) through a bolt; in addition, a threaded hole (19.1) in the left end cover (19) is connected with the speed measuring module outer shell (5) through a screw; one-way bearing (9) outer lane and right casing (21) key-type connection, stiff end (10.1) on electromagnetic clutch (10) are connected with right casing (21) through the screw.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10236176A (en) * 1997-02-27 1998-09-08 Tochigi Fuji Ind Co Ltd Transfer device
RU39440U1 (en) * 2004-04-05 2004-08-10 ОАО "Радиозавод" SEEDER SELLING PNEUMATIC
CN102487645A (en) * 2011-11-22 2012-06-13 陈恒 Negative pressure fan transmission device
CN109566029A (en) * 2019-02-01 2019-04-05 东北林业大学 A kind of the disengaging type land wheel and its transmission device of air seeder
CN109819726A (en) * 2019-04-03 2019-05-31 郑州航空工业管理学院 A kind of pneumatic type seeder is stable air supply system (and method for stabilizing voltage)
CN212211919U (en) * 2020-03-24 2020-12-25 华中农业大学 Pressure stabilizer of pneumatic system of direct seeding machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10236176A (en) * 1997-02-27 1998-09-08 Tochigi Fuji Ind Co Ltd Transfer device
RU39440U1 (en) * 2004-04-05 2004-08-10 ОАО "Радиозавод" SEEDER SELLING PNEUMATIC
CN102487645A (en) * 2011-11-22 2012-06-13 陈恒 Negative pressure fan transmission device
CN109566029A (en) * 2019-02-01 2019-04-05 东北林业大学 A kind of the disengaging type land wheel and its transmission device of air seeder
CN109819726A (en) * 2019-04-03 2019-05-31 郑州航空工业管理学院 A kind of pneumatic type seeder is stable air supply system (and method for stabilizing voltage)
CN212211919U (en) * 2020-03-24 2020-12-25 华中农业大学 Pressure stabilizer of pneumatic system of direct seeding machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
翟建波;夏俊芳;周俊华;周勇;展鹏程;: "气力式水稻芽种精量旱直播机的设计与试验", 华中农业大学学报, no. 01 *

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