CN111084171A - Air-assisted atomizing system for adjusting rotating speed of fan by adopting pulse width modulation - Google Patents
Air-assisted atomizing system for adjusting rotating speed of fan by adopting pulse width modulation Download PDFInfo
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- CN111084171A CN111084171A CN202010021895.2A CN202010021895A CN111084171A CN 111084171 A CN111084171 A CN 111084171A CN 202010021895 A CN202010021895 A CN 202010021895A CN 111084171 A CN111084171 A CN 111084171A
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- 239000007788 liquid Substances 0.000 claims abstract description 39
- 238000005507 spraying Methods 0.000 claims abstract description 25
- 239000003814 drug Substances 0.000 claims abstract description 20
- 239000007921 spray Substances 0.000 claims abstract description 14
- 238000000889 atomisation Methods 0.000 claims abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 230000002596 correlated effect Effects 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000000575 pesticide Substances 0.000 abstract description 23
- 238000000034 method Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 6
- 239000002420 orchard Substances 0.000 description 6
- 230000008021 deposition Effects 0.000 description 5
- 235000013399 edible fruits Nutrition 0.000 description 5
- 238000003912 environmental pollution Methods 0.000 description 5
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010914 pesticide waste Substances 0.000 description 2
- 241000883990 Flabellum Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000447 pesticide residue Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M7/00—Special adaptations or arrangements of liquid-spraying apparatus for purposes covered by this subclass
- A01M7/0003—Atomisers or mist blowers
- A01M7/0014—Field atomisers, e.g. orchard atomisers, self-propelled, drawn or tractor-mounted
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M7/00—Special adaptations or arrangements of liquid-spraying apparatus for purposes covered by this subclass
- A01M7/0089—Regulating or controlling systems
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Insects & Arthropods (AREA)
- Pest Control & Pesticides (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Catching Or Destruction (AREA)
Abstract
The invention relates to an air-supply atomization system for adjusting the rotating speed of a fan by adopting pulse width modulation. The system comprises a plurality of air supply atomizing devices and an air quantity adjusting control unit; the air-assisted atomizing device comprises a fan-shaped atomizing pipe body, a spray head and a brushless fan consisting of a brushless motor and fan blades; the fan-shaped spraying pipe body comprises a plurality of air outlets distributed in an arc shape and a duct for installing the brushless fan; the fan-shaped spraying pipe body is also provided with a plurality of liquid inlets which are in one-to-one correspondence with the air outlets; a liquid medicine guide pipe is fixed at each air outlet, the liquid inlet end of the liquid medicine guide pipe is connected with the liquid inlet, and the liquid outlet end of the liquid medicine guide pipe is connected with the spray head; the brushless motor is sleeved in the duct; the air quantity regulation control unit comprises a power supply, an electric regulation driver, a computer and a single chip microcomputer signal processor. The invention can adjust the rotating speed of the fan in real time, changes the air quantity, and has the characteristics of good applicability, high working efficiency, quick response of a control system and accurate pesticide application.
Description
Technical Field
The invention belongs to the technical field of agricultural plant protection machinery, relates to an air-supply atomization system, and particularly relates to an air-supply atomization system for adjusting the rotating speed of a fan by adopting pulse width modulation.
Background
Fruit tree spraying is an effective plant protection mode commonly adopted by nurseries and fruit trees, in China, the current automatic plant protection machinery and pesticide application technology applied to fruit tree spraying are relatively backward, the pesticide utilization rate is extremely low, an orchard sprayer adopts a spraying mode with single air volume in the whole pesticide application process, pesticide drift and loss are extremely easy to form, serious pesticide waste and environmental pollution are caused, and meanwhile, pesticide residue of agricultural products exceeds the standard. The air quantity adjusting technology can adjust the air quantity of the sprayer according to the actual demand of crops, improve the effective utilization rate of pesticide, improve the deposition uniformity of liquid medicine on a canopy, and reduce the environmental pollution and the personal injury to operators caused by pesticide drift in the pesticide applying process.
Most of the existing air-assisted sprayers in China adopt axial flow or centrifugal central large fans as air-assisted spraying execution components, and the air volume adjustment of the sprayers is mainly realized by adjusting the air outlet area, the air inlet area and the fan rotating speed of the fans, for example, in the Chinese invention patent application 'an orchard sprayer with controllable fan rotating speed' (application number 201210549173.X), an operator adjusts the rotating speed of the fans by using a control device arranged on a control console and displayed related information, and the air volume and the air speed of the fans are changed; the Chinese invention patent application 'an air inlet adjusting device of an air-assisted sprayer' (application number 201210545208.2) utilizes a stepping motor to control an air inlet baffle of an air box, realizes the change of the air inlet amount of the sprayer by adjusting the area of the air inlet, and finally achieves the change of the air outlet amount; the Chinese patent application No. 201510044751.8 discloses a self-adaptive air volume adjusting device, which adopts a central large fan to output air volume, and an air volume shunting device is arranged at the side end of each air outlet, so as to solve the problem of overlarge air volume, but the air volume adjusting mode can only be applied to the premise that the required air volume is smaller than the output air volume, and if the output air volume of the fan is smaller than the requirement of a tree crown, the adjusting mode has no meaning; secondly, the air quantity adjusting range of the method is limited, and the actual operation requirement is difficult to meet. The air volume adjusting technology adopts a single axial flow fan as an air flow source, has poor adaptability to fruit trees, realizes the integral adjustment of air volume by adjusting the areas of the air inlet and the air outlet of the fan and the rotating speed of a central large fan, and cannot adjust local air volume; meanwhile, in the working process, because the real-time performance of the fan and the adjusting device hardly meets the operation requirement, the problems of pesticide drift or uneven deposition and the like caused by overlarge or undersize local air volume are easily caused in the pesticide application process, and the automation degree is lower. Aiming at the situation that plant protection machinery and pesticide application technology in China fall behind and attach importance to environmental protection at present, a new air volume adjusting technology is needed to be designed, the rotating speed of a fan can be adjusted in real time by adopting electronic signals, the air volume adjustment of a spraying machine is realized, and the environmental pollution caused by pesticide drift is reduced.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide an air-assisted atomizing system using pulse width modulation to adjust the rotation speed of a fan, wherein a brushless dc motor is used as an air volume actuator, and a computer sends a pulse width modulation PWM signal to adjust the rotation speed of the motor in real time, so that the air-assisted atomizing system can be applied to an orchard automatic variable spraying machine, and can adjust the rotation speed of the fan in real time according to the size of a crown of a fruit tree to change the air volume, thereby improving the uniformity of droplet deposition on a canopy target, reducing pesticide waste caused in the pesticide application process, and reducing environmental pollution and personal injury to an operator caused by drift of pesticide in the pesticide application process.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an adopt pulse width modulation to adjust wind of fan rotational speed and send atomizing system, this wind send atomizing system includes a plurality of wind and send atomizing device and air regulation control unit.
The air-assisted atomizing device comprises a fan-shaped atomizing pipe body, a spray head 12 and a brushless fan consisting of a brushless motor 3 and fan blades 7; the fan-shaped spraying pipe body comprises a plurality of air outlets 14 distributed in an arc shape and a duct 8 for mounting a brushless fan; the fan-shaped spraying pipe body is also provided with a plurality of liquid inlets 9 which are in one-to-one correspondence with the air outlets 14; a liquid medicine guide pipe 11 is fixed at each air outlet 14, the liquid inlet end of the liquid medicine guide pipe 11 is connected with the liquid inlet 9, and the liquid outlet end is connected with the spray head 12; the brushless motor 3 is sleeved in the duct 8.
The air volume adjusting control unit comprises a power supply 1, an electric regulation driver 2, a computer 4 and a singlechip signal processor 5; the power supply 1 is connected with the electric adjusting driver 2, and the electric adjusting driver 2 is connected with the brushless motor 3 and used for converting the driving voltage of the brushless motor 3; and the single chip microcomputer signal processor 5 is respectively connected with the computer 4 and the electric regulation driver 2.
The power supply 1 is a direct current 12V lithium battery.
The rotation speed of the brushless motor 3 is positively correlated with the voltage, and the higher the voltage, the faster the rotation speed.
The computer 4 adjusts the equivalent output voltage of the electric regulation driver 2 by outputting the pulse width modulation signal, the input duty ratio of the electric regulation driver 2 is positively correlated with the equivalent output voltage, and the relational expression is as follows: v0＝Vcc×r；
In the formula (I), the compound is shown in the specification,
V0is the equivalent output voltage of the electrically adjustable driver 2, and the unit is V;
Vccis a supply voltage, in units of V;
r is input duty cycle,%, r ═ t0T, T is a signal period with the unit of s; t is t0High corresponds to time in units of s.
The air-assisted atomizing device comprises 5 air outlets 14 which are provided with 5 spray heads 12.
A plurality of groups of air-conveying atomizing devices can be arranged on two sides of the spraying machine, the medicine conveying pipeline 13 is connected with the liquid inlet 9 of each atomizing device, the computer 4 simultaneously outputs a plurality of paths of PWM signals, and the rotating speeds of the brushless motors 3 of the air-conveying atomizing devices are respectively and independently adjusted.
The singlechip signal processor 5 takes an ARM as a core processing unit and can adjust the duty ratio in real time.
The distance between the reinforcing ribs 10 and the edge of the air outlet 14 is 1 cm.
The liquid medicine guide pipe 11 is fixed at the center of the air outlet 14 through a reinforcing rib 10.
The outer diameter of the brushless motor 3 is smaller than the inner diameter of the duct 8.
Compared with the prior art, the invention has the beneficial effects that:
the invention can rapidly adjust the rotating speed of the fan through the PWM signal, thereby meeting the real-time change of the air quantity; meanwhile, 5 spray heads are assembled on the air-assisted atomizing device, and the air quantity and the fog droplet movement distance of the sprayer can be adjusted by combining the volume of the tree crown and the distance between the sprayer and the tree crown. This design can replace conventional central authorities 'big fan for spraying, multiunit atomizing device assembles simultaneously on most for the atomizer car, adjust the spraying direction in a flexible way, both can adjust the fan air outlet amount of wind in real time, improve droplet deposition uniformity, can also adjust the spraying direction according to the tree crown growth situation is nimble, realize the profile modeling spraying with the adaptation of tree crown shape, reduce the environmental pollution that the in-process of giving medicine to poor free of charge caused because the pesticide drifts and to operator's bodily injury, plant protection operation automation level has been improved, and control system response is sensitive, and control is accurate.
The invention flexibly adjusts the rotating speed of the fan by using an electric signal, changes the air quantity of the spraying machine, and can effectively improve the deposition uniformity of the liquid medicine on the canopy by using the multi-nozzle and brushless fan combined air-conveying atomization device; meanwhile, the device can be applied to the development of automatic and accurate variable spraying machines in fields and orchards and has extremely high use potential. The device has the characteristics of good applicability, high working efficiency, quick response of a control system and accurate pesticide application, and is favorable for popularization of a pesticide saving technology.
Drawings
FIG. 1 is a schematic structural view of an air-assisted atomizing system for adjusting the rotating speed of a fan by pulse width modulation according to the present invention;
FIG. 2 is a PWM regulation schematic;
fig. 3 is a schematic structural diagram of a plurality of groups of air-assisted atomizing devices applied to an orchard sprayer.
Wherein the reference numerals are:
1 power supply and 2 electric regulation driver
3 brushless motor 4 computer
5 singlechip signal processor 6 wire
7 flabellum 8 duct
9 liquid inlet and 10 reinforcing ribs
11 liquid medicine guide pipe 12 nozzle
13 medicine conveying pipeline 14 air outlet
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1, the air-supply atomizing system for adjusting the rotating speed of the fan by adopting pulse width modulation comprises a plurality of air-supply atomizing devices and an air quantity adjusting control unit. Wherein:
the air-assisted atomizing device comprises a fan-shaped atomizing pipe body, a spray head 12 and a brushless fan consisting of a brushless motor 3 and fan blades 7; the fan-shaped spraying pipe body comprises a plurality of air outlets 14 distributed in an arc shape and a duct 8 for mounting a brushless fan; the fan-shaped spraying pipe body is also provided with a plurality of liquid inlets 9 which are in one-to-one correspondence with the air outlets 14; a liquid medicine guide pipe 11 is fixed at the center of each air outlet 14 through a reinforcing rib 10, the liquid inlet end of the liquid medicine guide pipe 11 is connected with the liquid inlet 9, and the liquid outlet end is connected with the spray head 12. Preferably, the distance between the reinforcing rib 10 and the edge of the air outlet 14 is 1 cm.
The outer diameter of the brushless motor 3 is smaller than the inner diameter of the duct 8, and the brushless motor 3 can be sleeved in the duct 8.
The air volume adjusting control unit comprises a power supply 1, an electric adjusting driver 2, a computer 4 and a single chip microcomputer signal processor 5. The power supply 1 is connected with the electric adjusting driver 2, and the electric adjusting driver 2 is connected with the brushless motor 3; and the single chip microcomputer signal processor 5 is respectively and electrically connected with the computer 4 and the electric tuning driver 2.
Wherein, power 1 is ordinary direct current 12V lithium cell, and electricity accent driver 2 is used for converting brushless motor 3's voltage, and driving motor works, 3 rotational speeds of brushless motor become positive correlation with voltage, and voltage is higher, and the rotational speed is faster.
As shown in fig. 2The computer 4 adjusts the equivalent output voltage of the electrically-adjustable driver 2 by outputting a Pulse Width Modulation (PWM) signal, wherein in the figure, T is a signal period and the unit is s; u is a level signal with the unit of V; u shapebIs the high level of the pulse width signal, and the unit is V; t is t0Is high level corresponding time with unit of s; t is t1Low corresponds to time in units of s.
Input duty ratio r ═ t0and/T, wherein the input duty cycle of the electrically adjustable driver 2 is in positive correlation with the equivalent output voltage thereof, and the relation is as follows: v0＝Vcc×r。
In the formula (I), the compound is shown in the specification,
V0is the equivalent output voltage of the electrically adjustable driver 2, and the unit is V;
Vccis a supply voltage, in units of V;
r is the input duty cycle,%.
The power supply 1, the electric regulation driver 2, the brushless motor 3, the computer 4 and the single chip microcomputer signal processor 5 are all connected through a wire 6. The fan blade 7 is fixed on the rotating shaft of the brushless motor 3 through screws to form a brushless fan generating air flow.
The rotating speed of the brushless motor 3 can be adjusted through the PWM signals, so that the air quantity is adjusted, and the computer 4 can simultaneously output a plurality of paths of PWM signals and respectively and independently adjust the rotating speeds of the brushless motors 3 of the air supply atomization devices according to actual requirements.
The air-assisted atomizing device comprises 5 air outlets 14 and 5 spray heads 12, and the air quantity assists the fog drops of the 5 spray heads 12 to be conveyed to target crops.
As shown in fig. 3, the structural schematic diagram of the multi-group air-assisted atomizing device applied to the orchard sprayer is shown. A plurality of groups of air-conveying atomizing devices can be arranged on two sides of the spraying machine, the medicine conveying pipeline 13 is connected with the liquid inlet 9 of each atomizing device to provide liquid medicine for each air-conveying atomizing device, and the computer 4 can independently adjust the air quantity of each air-conveying atomizing device at the same time to realize the effect of profile modeling variable spraying.
The single chip microcomputer signal processor 5 adopts an ARM as a core processing unit, can adjust the duty ratio in real time to adjust the rotating speed of the brushless motor 3, and changes the air volume of the spraying machine.
The working process of the invention is as follows:
in the actual operation process, according to user's needs, input corresponding duty ratio at computer 4 control interface, send the instruction to singlechip signal processor 5, singlechip signal processor 5 outputs corresponding PWM signal to electrically tunable driver 2 according to the instruction, changes brushless motor 3 both ends voltage, realizes the regulation to brushless motor 3 rotational speed. The pesticide delivery pipeline 13 of the sprayer is a pneumatic atomization device for delivering pesticide liquid, the pesticide liquid is sprayed out through the pesticide liquid guide pipe 11 and the spray head 12 to form fog drops, and the pesticide liquid is assisted to move to target crops by air flow generated by the fan.
The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this, such as the model of the brushless motor and the size of the air-fed atomization device. Any changes or substitutions that may be easily made by those skilled in the art within the technical scope of the present disclosure are intended to be included within the scope of the present disclosure. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides an adopt pulse width modulation to adjust air-assisted atomizing system of fan rotational speed which characterized in that: the air-conveying atomization system comprises a plurality of air-conveying atomization devices and an air quantity adjusting control unit;
the air-assisted atomizing device comprises a fan-shaped atomizing pipe body, a spray head (12) and a brushless fan consisting of a brushless motor (3) and fan blades (7); the fan-shaped spraying pipe body comprises a plurality of air outlets (14) distributed in an arc shape and a duct (8) for mounting the brushless fan; the fan-shaped spraying pipe body is also provided with a plurality of liquid inlets (9) which are in one-to-one correspondence with the air outlets (14); a liquid medicine guide pipe (11) is fixed at each air outlet (14), the liquid inlet end of the liquid medicine guide pipe (11) is connected with the liquid inlet (9), and the liquid outlet end is connected with the spray head (12); the brushless motor (3) is sleeved in the duct (8);
the air volume adjusting control unit comprises a power supply (1), an electric regulation driver (2), a computer (4) and a single chip microcomputer signal processor (5); the power supply (1) is connected with the electric adjusting driver (2), and the electric adjusting driver (2) is connected with the brushless motor (3) and used for converting the driving voltage of the brushless motor (3); and the single chip microcomputer signal processor (5) is respectively connected with the computer (4) and the electric regulation driver (2).
2. The air-assisted atomizing system adopting pulse width modulation to adjust the rotating speed of the fan according to claim 1, is characterized in that: the power supply (1) is a direct current 12V lithium battery.
3. The air-assisted atomizing system adopting pulse width modulation to adjust the rotating speed of the fan according to claim 1, is characterized in that: the rotating speed of the brushless motor (3) is positively correlated with the voltage, and the higher the voltage is, the faster the rotating speed is.
4. The air-assisted atomizing system adopting pulse width modulation to adjust the rotating speed of the fan according to claim 1, is characterized in that: the computer (4) adjusts the equivalent output voltage of the electric regulation driver (2) by outputting a pulse width modulation signal, the input duty ratio of the electric regulation driver (2) is positively correlated with the equivalent output voltage, and the relational expression is as follows: v0＝Vcc×r；
In the formula (I), the compound is shown in the specification,
V0is the equivalent output voltage of the electrically-regulated driver (2), and the unit of the equivalent output voltage is V;
Vccis a supply voltage, in units of V;
r is input duty cycle,%, r ═ t0T, T is a signal period with the unit of s; t is t0High corresponds to time in units of s.
5. The air-assisted atomizing system adopting pulse width modulation to adjust the rotating speed of the fan according to claim 1, is characterized in that: the air-assisted atomizing device comprises 5 air outlets (14) which are provided with 5 spray heads (12).
6. The air-assisted atomizing system adopting pulse width modulation to adjust the rotating speed of the fan according to claim 1, is characterized in that: a plurality of groups of air-conveying atomizing devices can be arranged on two sides of the spraying machine, a medicine conveying pipeline (13) is connected with a liquid inlet (9) of each atomizing device, and a computer (4) outputs a plurality of paths of PWM signals simultaneously and independently adjusts the rotating speed of a brushless motor (3) of the air-conveying atomizing devices respectively.
7. The air-assisted atomizing system adopting pulse width modulation to adjust the rotating speed of the fan according to claim 1, is characterized in that: the singlechip signal processor (5) takes an ARM as a core processing unit and can adjust the duty ratio in real time.
8. The air-assisted atomizing system adopting pulse width modulation to adjust the rotating speed of the fan according to claim 1, is characterized in that: the distance between the reinforcing ribs (10) and the edge of the air outlet (14) is 1 cm.
9. The air-assisted atomizing system adopting pulse width modulation to adjust the rotating speed of the fan according to claim 1, is characterized in that: the liquid medicine guide pipe (11) is fixed at the center of the air outlet (14) through a reinforcing rib (10).
10. The air-assisted atomizing system adopting pulse width modulation to adjust the rotating speed of the fan according to claim 1, is characterized in that: the outer diameter of the brushless motor (3) is smaller than the inner diameter of the duct (8).
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| CN202010021895.2A CN111084171A (en) | 2020-01-09 | 2020-01-09 | Air-assisted atomizing system for adjusting rotating speed of fan by adopting pulse width modulation |
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| CN202010021895.2A CN111084171A (en) | 2020-01-09 | 2020-01-09 | Air-assisted atomizing system for adjusting rotating speed of fan by adopting pulse width modulation |
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Cited By (2)
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| CN113951231A (en) * | 2021-10-19 | 2022-01-21 | 农业农村部南京农业机械化研究所 | Dual-system combined pesticide applying sprayer |
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Application publication date: 20200501 |
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| RJ01 | Rejection of invention patent application after publication |