CN103630418A - Characteristic test bench of pulse-width modulation (PWM) intermittent spray variable spraying system - Google Patents
Characteristic test bench of pulse-width modulation (PWM) intermittent spray variable spraying system Download PDFInfo
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Abstract
The invention discloses a characteristic test bench of a pulse-width modulation (PWM) intermittent spray variable spraying system. The characteristic test bench comprises a measurement and control system and a pipeline system, wherein the measurement and control system comprises an industrial personal computer, a signal conditioning unit, a power output module and an amplifier; the pipeline system comprises a diaphragm pump liquid supply device, an electric overflow device, a plurality of variable spraying units, a constant pressure liquid supply branch, a constant pressure outlet branch, an electromagnetic valve dynamic characteristic test unit and a multi-source pressure surge coupling characteristic test unit; a plurality of transparent pipeline sections and pressure sensors are arranged on a connection pipeline among a diaphragm pump outlet, a proportional overflow valve outlet, an electromagnetic valve inlet and outlet hole, a main pipeline and an electromagnetic valve, so as to carry out internal flow field characteristic test of the pipeline and pressure monitoring by using a high-speed image collection system or a flow field test system. The characteristic test bench of the PWM intermittent spray variable spraying system can be applied to testing of diaphragm pump pressure pulsation characteristics of the PWM intermittent spray variable spraying system, proportional overflow valve dynamic characteristics, electromagnetic valve dynamic characteristics and propagation characteristics of a multi-source pressure surge in the pipeline.
Description
Technical field
The present invention relates to PWM intermittent spraying formula variable spraying system attribute testing platform, belong to agricultural equipment characteristic test and optimal design field, especially variable farm chemical applying machine characteristic test and optimal design field.
Background technology
For improving effective rate of utilization, the minimizing agricultural chemicals of agricultural chemicals, run off, improve prevention effect, pesticide application equipment should be according to the concrete condition of Crops Pests Control of Diseases Insects And Weeds Pests of Crops in each zonule in farmland, to damage area, evenly spray exactly the agricultural chemicals of institute's expense, variable sprays target.Variable sprays the low pollution that can realize agricultural chemicals to target and efficiently utilizes, and is the important development direction of equipment for plant protection and pesticide application technology.Existing variable sprays control mode and mainly contains three kinds of pressure adjustable type, concentration adjustment formula and flow regulation formulas, and flow regulation formula has again Flux Valve Control spraying and two kinds of implementations of width modulation (PWM) solenoid control intermittent spraying continuously.Wherein, large, the fast response time of PWM solenoid control intermittent spraying formula variable spraying system flow adjustment range, transverse spatial resolution is high, atomization characteristics is better, is the major way that current variable sprays control.
PWM intermittent spraying formula variable spraying system is provided with a high-speed switch electromagnetic valve before each shower nozzle, the intermittent spraying of realizing shower nozzle by controlling the break-make of solenoid valve, the make-and-break time ratio of electromagnetic valve for adjusting (pwm signal dutycycle) can change the actual mist flow of shower nozzle.But the frequent break-make fast of solenoid valve will be impacted and vortex by initiation pressure in pressure piping, even occurs air pocket and water hammer, affects atomization characteristics and the mist flow of shower nozzle.In addition, in engine-driven atomiser, generally all adopt membrane pump isometric(al) pump feed flow, although be provided with voltage stabilizing air chamber, but still can produce larger periodic pressure pulsation.The pressure surge of a plurality of solenoid valves and membrane pump output is propagated, is coupled in pipeline, in addition the impact of pressure loss in piping, cause actual atomisation pressure and the fluctuation situation thereof of diverse location shower nozzle different, very large on the impact of shower nozzle atomization characteristics and mist flow control accuracy.
Performance optimization and Proper Match by each Hydraulic Elements in liquid pipeline, can reduce the pressure surge that it produces separately, and effectively development and the propagation of surge suppressing.But, the research major part of relevant PWM intermittent spraying formula variable spraying system concentrates on the testing spraying characteristic of prototype system both at home and abroad, and about the research of its interior flow field characteristic and Optimized System Design seldom, relevant characteristic test experimental facilities is rare report also.Document " the static mist amount distribution character of width modulation intermittent spraying variable spraying system " (Wei Xinhua etc., Transactions of the Chinese Society of Agricultural Engineering, the 5th phase in 2013, a kind of PWM variable spraying test system is disclosed 19-24 page), its pipeline portions adopts membrane pump feed flow, mainly by spray tank, filtrator, membrane pump, proportional pressure control valve, high-speed switch electromagnetic valve, shower nozzle and pipeline form, its observing and controlling part is mainly by pressure transducer, flow sensor, signal conditioning circuit, A/D data collecting card, PWM signal output card, power driver module, D/A output card, amplifier and industrial computer form, can carry out the atomization characteristics of PWM batch (-type) variable spraying system, spray the test of metering characteristics and mist amount distribution character, but cannot carry out the test of pipeline interior flow field.
Summary of the invention
The deficiency that cannot carry out the test of pipeline interior flow field for overcoming existing PWM intermittent spraying formula variable spraying test test macro, the invention provides PWM intermittent spraying formula variable spraying system attribute testing platform, can realize interior flow field test and pressure monitoring that membrane pump export pipeline, proportional pressure control valve entrance pipe and solenoid valve gateway pipeline etc. locate, thereby establish experimental basis for characteristic test, performance optimization and the Proper Match of each Hydraulic Elements in PWM intermittent spraying formula variable spraying system.
For realizing the test of PWM intermittent spraying formula variable spraying system pipeline interior flow field, the present invention adopts following technical scheme:
PWM intermittent spraying formula variable spraying system attribute testing platform, is comprised of pipe system and TT&C system; Pipe system comprises that the variable of membrane pump liquid feed device, automatically controlled overflow mechanism and a plurality of identical configurations sprays unit; Membrane pump liquid feed device is connected in sequence by pipeline by spray tank (1), filtrator A (6), membrane pump (7), pressure transducer B (8), flow sensor A (9) and switch valve B (10), the manual overflow branch road of membrane pump takes back spray tank (1) by surplus valve (5), and the other end of switch valve B (10) connects main line; Automatically controlled overflow mechanism is connected in sequence by pipeline by switch valve A (4), pressure transducer A (3), proportional pressure control valve (2) and spray tank (1), and the other end of switch valve A (4) connects main line; Variable sprays unit one and comprises three groups of " solenoid valve+shower nozzle " combinations arranged side by side, solenoid valve E (36) is set on the front end pipeline of shower nozzle D (37), solenoid valve F (38) is set on the front end pipeline of shower nozzle E (39), solenoid valve G (40) is set on the front end pipeline of shower nozzle F (41), the other end of solenoid valve E (36), solenoid valve F (38), solenoid valve G (40) is by pipeline tandem to flow sensor B (35), and the other end of flow sensor B (35) connects main line by switch valve G (34); Variable sprays unit two and variable, and to spray unit one configuration identical, also comprise three groups of " solenoid valve+shower nozzle " combinations arranged side by side, solenoid valve H (44) is set on the front end pipeline of shower nozzle G (45), electromagnetic valve I (46) is set on the front end pipeline of shower nozzle H (47), solenoid valve J (48) is set on the front end pipeline of shower nozzle I (49), the other end of solenoid valve H (44), electromagnetic valve I (46), solenoid valve J (48) is by pipeline tandem to flow sensor C (43), and the other end of flow sensor C (43) connects main line by switch valve H (42);
It is characterized in that: in the pipeline between membrane pump (7) and pressure transducer B (8), be provided with transparent pipe section B (52), in the pipeline between proportional pressure control valve (2) and pressure transducer A (3), be provided with transparent pipe section A (51); In main line, be provided with one section of transparent pipe section C (53), and in the front and back end of transparent pipe section C (53), connect respectively pressure transducer D (15) and E (16) are set; Pipe system also comprises constant-pressure liquid supply branch road, constant voltage outlet branch road, Dynamic Characteristic of Solenoid Valve test cell, multi-source pressure surge coupling characteristic test unit.
Described constant-pressure liquid supply props up route spray tank (1), filter B (11), constant-pressure liquid supply device (12), pressure transducer C (13) and switch valve C (14) and is connected in sequence by pipeline, another termination main line of switch valve C (14), the liquid supply pressure of constant-pressure liquid supply device (12) is adjustable continuously within the scope of 0.1MPa ~ 1.0MPa, and pressure surge amplitude is within ± 0.005Mpa.
A described constant voltage outlet route switch valve E (22) and constant voltage device for storing liquid (24) are composed in series by pipeline, another termination main line of switch valve E (22), the set pressure of constant voltage device for storing liquid (24) is adjustable continuously within the scope of 0.1MPa ~ 1.0MPa, and pressure surge amplitude is within ± 0.005Mpa.
Described Dynamic Characteristic of Solenoid Valve test cell is connected in sequence by pipeline by switch valve D (17), pressure transducer F (18), transparent pipe section D (54), solenoid valve A (19), transparent pipe section E (55), pressure transducer G (20) and shower nozzle A (21), another termination main line of switch valve D (17).
Described multi-source pressure surge coupling characteristic test unit comprises three branch roads, branch road one is by pressure transducer H (26), solenoid valve B (27) and constant voltage device for storing liquid (24) are connected in sequence by pipeline, branch road two is by pressure transducer I (28), solenoid valve C (29) and shower nozzle B (30) are connected in sequence by pipeline, branch road three is by pressure transducer J (31), solenoid valve D (32), shower nozzle C (33) is connected in sequence by pipeline, between branch road one and branch road two, by transparent pipe section F (56), connect, between branch road two and branch road three, by transparent pipe section G (57), connect, branch road three is also connected to switch valve F (25) by pipeline, another termination main line of switch valve F (25).
Described membrane pump (7), proportional pressure control valve (2), solenoid valve A (19), transparent pipe section C (53), transparent pipe section F (56) and transparent pipe section G (57) are all detachably replaced by the similar device of different structure, response characteristic or material parameter.The test that high-speed image acquisition system or flow field test system carry out pipeline interior flow field characteristic all can be installed in described outside, all transparent pipes section.
Described TT&C system comprises industrial computer (61), A/D transition card (63) is installed in industrial computer (61), pwm signal output card (64) and D/A transition card (65), display (62) is electrically connected to industrial computer (61), the output signal of all pressure transducers and all flow sensors is electrically connected to signal condition unit (66), signal condition unit (66) is electrically connected to A/D transition card (63), the output signal of pwm signal output card (64) is connected respectively to each solenoid valve after power output module (67) amplifies, the output signal of D/A transition card (65) is control ratio surplus valve (2) after amplifier (68) amplifies.
Compared with prior art, originally
invention has the following advantages:
1. the present invention is by arranging transparent pipe section and pressure transducer at membrane pump outlet, proportional overflow valve inlet and place, solenoid valve gateway, can realize interior flow field test and pressure monitoring that membrane pump export pipeline, proportional pressure control valve entrance pipe and solenoid valve gateway pipeline etc. are located, to its interior flow field characteristic is carried out to test analysis;
2. the present invention is by the setting of transparent pipe section F (56), G (57) and C (53) and pressure transducer D (15), E (16), H (26), I (28) and J (31), and propagation, decay and the coupled characteristics of multi-source pressure surge in pipeline such as the hydraulic shock that can cause solenoid valve keying and membrane pump pressure fluctuation carry out test analysis;
3. the present invention, by changing membrane pump, proportional pressure control valve, solenoid valve and the transparent pipe section of different structure, response characteristic or material parameter, can carry out analytical test to the impact of government pressure fluctuation to above parameter.
4. the present invention is provided with different feed flow branch roads and fluid branch road, thereby when experimental test, can select different gateway conditions.
Accompanying drawing explanation
Fig. 1 is the structural representation of pipeline portions of the present invention;
Fig. 2 is the structural representation of control section of the present invention.
In figure: 1. spray tank; 2. proportional pressure control valve; 3. pressure transducer A; 4. switch valve A; 5. surplus valve; 6. filtrator A; 7. membrane pump; 8. pressure transducer B; 9. flow sensor A; 10. switch valve B; 11. filter B; 12. constant-pressure liquid supply devices; 13. pressure transducer C; 14. switch valve C; 15. pressure transducer D; 16. pressure transducer E; 17. switch valve D; 18. pressure transducer F; 19. solenoid valve A; 20. pressure transducer G; 21. shower nozzle A; 22. switch valve E; 24. constant voltage device for storing liquid; 25. switch valve F; 26. pressure transducer H; 27. solenoid valve B; 28. pressure transducer I; 29. solenoid valve C; 30. shower nozzle B; 31. pressure transducer J; 32. solenoid valve D; 33. shower nozzle C; 34. switch valve G; 35. flow sensor B; 36. solenoid valve E; 37. shower nozzle D; 38. solenoid valve F; 39. shower nozzle E; 40. solenoid valve G; 41. shower nozzle F; 42. switch valve H; 43. flow sensor C; 44. solenoid valve H; 45. shower nozzle G; 46. electromagnetic valve I; 47. shower nozzle H; 48. solenoid valve J; 49. shower nozzle I; 51. transparent pipe section A; 52. transparent pipe section B; 53. transparent pipe section C; 54. transparent pipe section D; 55. transparent pipe section E; 56. transparent pipe section F; 57. transparent pipe section G; 61. industrial computers; 62. displays; 63.A/D capture card; 64.PWM signal output card; 65.D/A output card; 66. signal condition unit; 67. power output modules; 68. amplifiers.
Embodiment
As depicted in figs. 1 and 2, PWM intermittent spraying formula variable spraying system attribute testing platform, is comprised of pipe system and TT&C system.Pipe system comprises that the variable of membrane pump liquid feed device, automatically controlled overflow mechanism, a plurality of identical configurations sprays unit, constant-pressure liquid supply branch road, constant voltage outlet branch road, Dynamic Characteristic of Solenoid Valve test cell and multi-source pressure surge coupling characteristic test unit.Membrane pump liquid feed device is connected in sequence by pipeline by spray tank 1, filtrator A6, membrane pump 7, pressure transducer B8, flow sensor A9 and switch valve B10, the manual overflow branch road of membrane pump takes back spray tank 1 by surplus valve 5, the other end of switch valve B10 connects main line, is provided with transparent pipe section B52 in the pipeline between membrane pump 7 and pressure transducer B8.Automatically controlled overflow mechanism is connected in sequence by pipeline by switch valve A4, pressure transducer A3, proportional pressure control valve 2 and spray tank 1, the other end of switch valve A4 connects main line, is provided with transparent pipe section A51 in the pipeline between proportional pressure control valve 2 and pressure transducer A3.Variable sprays unit one and comprises three groups of " solenoid valve+shower nozzle " combinations arranged side by side, on the front end pipeline of shower nozzle D37, solenoid valve E36 is set, on the front end pipeline of shower nozzle E39, solenoid valve F38 is set, on the front end pipeline of shower nozzle F41, solenoid valve G40 is set, the other end of solenoid valve E36, solenoid valve F38, solenoid valve G40 is by pipeline tandem to flow sensor B35, and the other end of flow sensor B35 connects main line by switch valve G34.Variable sprays unit two and variable, and to spray unit one configuration identical, also comprise three groups of " solenoid valve+shower nozzle " combinations arranged side by side, on the front end pipeline of shower nozzle G45, solenoid valve H44 is set, on the front end pipeline of shower nozzle H47, electromagnetic valve I 46 is set, on the front end pipeline of shower nozzle I49, solenoid valve J48 is set, the other end of solenoid valve H44, electromagnetic valve I 46, solenoid valve J48 is by pipeline tandem to flow sensor C43, and the other end of flow sensor C43 connects main line by switch valve H42.In main line, be provided with one section of transparent pipe section C53, and connect respectively pressure transducer D15 and E16 are set in the front and back end of transparent pipe section C53.Constant-pressure liquid supply props up route spray tank 1, filter B 11, constant-pressure liquid supply device 12, pressure transducer C13 and switch valve C14 and is connected in sequence by pipeline, another termination main line of switch valve C14, the liquid supply pressure of constant-pressure liquid supply device 12 is adjustable continuously within the scope of 0.1MPa ~ 1.0MPa, and pressure surge amplitude is within ± 0.005Mpa.A constant voltage outlet route switch valve E22 and constant voltage device for storing liquid 24 are composed in series by pipeline, another termination main line of switch valve E22, the set pressure of constant voltage device for storing liquid 24 is adjustable continuously within the scope of 0.1MPa ~ 1.0MPa, and pressure surge amplitude is within ± 0.005Mpa.Dynamic Characteristic of Solenoid Valve test cell is connected in sequence by pipeline by switch valve D17, pressure transducer F18, transparent pipe section D54, solenoid valve A19, transparent pipe section E55, pressure transducer G20 and shower nozzle A21, another termination main line of switch valve D17.Multi-source pressure surge coupling characteristic test unit comprises three branch roads, branch road one is by pressure transducer H26, solenoid valve B27 and constant voltage device for storing liquid 24 are connected in sequence by pipeline, branch road two is by pressure transducer I28, solenoid valve C29 and shower nozzle B30 are connected in sequence by pipeline, branch road three is by pressure transducer J31, solenoid valve D32, shower nozzle C33 is connected in sequence by pipeline, between branch road one and branch road two, by transparent pipe section F56, connect, between branch road two and branch road three, by transparent pipe section G57, connect, branch road three is also connected to switch valve F25 by pipeline, another termination main line of switch valve F25.Membrane pump 7, proportional pressure control valve 2, solenoid valve A19, transparent pipe section C53, transparent pipe section F56 and transparent pipe section G57 are all detachably replaced by the similar device of different structure, response characteristic or material parameter.The test that high-speed image acquisition system or flow field test system carry out pipeline interior flow field characteristic all can be installed in outside, all transparent pipes section.TT&C system comprises industrial computer 61, A/D transition card 63, pwm signal output card 64 and D/A transition card 65 are installed in industrial computer 61, display 62 is electrically connected to industrial computer 61, the output signal of all pressure transducers and all flow sensors is electrically connected to signal condition unit 66, signal condition unit 66 is electrically connected to A/D transition card 63, the output signal of pwm signal output card 64 is connected respectively to each solenoid valve after power output module 67 amplifies, and the output signal of D/A transition card 65 is control ratio surplus valve 2 after amplifier 68 amplifies.
When carrying out the test of membrane pump pressure fluctuation characteristics, closing switch valve A4, switch valve C14, switch valve D17 and switch valve F25, by membrane pump liquid feed device feed flow, and can select constant voltage outlet branch road or variable to spray unit as liquid discharge device, by flow and the force value in pressure transducer B8 and flow sensor A9 Real-time Collection membrane pump 7 exits, and utilize high-speed image acquisition system or flow field test system to carry out the test of pipeline interior flow field characteristic by transparent pipe section B52.Replaceable different membrane pump 7 also, or be the voltage stabilizing air chamber that membrane pump 7 is changed different structure, different volumes and different initial gas pressure, with to it pressure fluctuation characteristics under different condition carry out test analysis.
When carrying out proportional pressure control valve dynamic characteristic test, closing switch valve B10, switch valve D17, switch valve E22 and switch valve F25, by constant-pressure liquid supply branch road feed flow, and select one group or several groups of variablees to spray unit as liquid discharge device, the step of the different amplitudes by constant-pressure liquid supply device 12 liquid supply pressures changes comes simulated pressure to fluctuate, utilize the force value of pressure transducer A3 Real-time Collection proportional pressure control valve porch, and utilize high-speed image acquisition system or flow field test system to carry out the test of pipeline interior flow field characteristic by transparent pipe section A51.The proportional pressure control valve of replaceable different parameters also, to test its dynamic perfromance under different condition.
When carrying out Dynamic Characteristic of Solenoid Valve test, closing switch valve A4, switch valve B10, switch valve E22, switch valve F25, switch valve G34 and switch valve H42, by constant-pressure liquid supply branch road feed flow, and select shower nozzle A21 as liquid discharge device, utilize pressure transducer F18 and pressure transducer G20 Real-time Collection solenoid valve A19 single motion or the force value at its two ends during with different frequency periodic motion, and utilize high-speed image acquisition system or flow field test system to carry out the test of pipeline interior flow field characteristic by transparent pipe section D54 and transparent pipe section E55.Solenoid valve A19 is also replaceable is the solenoid valve of different parameters, to test its dynamic perfromance under different condition.
Also can pass through closing switch valve A4, switch valve B10, switch valve D17, switch valve F25 and switch valve G34, by constant-pressure liquid supply branch road feed flow, and select constant voltage outlet branch road or variable to spray unit as liquid discharge device, the step of the different amplitudes by constant-pressure liquid supply device 12 liquid supply pressures changes comes simulated pressure to fluctuate, utilize the pressure in pressure transducer D15 and pressure transducer E16 Real-time Collection main line to change, and utilize high-speed image acquisition system or flow field test system to carry out the test of pressure surge propagation characteristic in main line by transparent pipe section C53.
Also can pass through closing switch valve A4, switch valve B10, switch valve D17, switch valve E22, switch valve G34 and switch valve H42, by constant-pressure liquid supply branch road feed flow, and select shower nozzle B30, shower nozzle C33 and constant voltage device for storing liquid 24 are as liquid discharge device, by pressure transducer H26, pressure transducer I28 and pressure transducer J31 be Real-time Collection solenoid valve B27 respectively, the pressure of solenoid valve C29 and solenoid valve D32 porch changes, and utilize high-speed image acquisition system or propagation and the coupled characteristic of flow field test system test solenoid valve compression shock in bye-pass by transparent pipe section F56 and transparent pipe section G57.
By the combination of different liquid feed devices and different liquid discharge devices, and the selection of different pressures fluctuation sources, can also carry out other pressure surge characteristic tests.
Finally should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and do not depart from the spirit and scope of technical solution of the present invention, within it all should be encompassed in claim scope of the present invention.
Claims (8)
1.PWM intermittent spraying formula variable spraying system attribute testing platform, is comprised of pipe system and TT&C system; Pipe system comprises that the variable of membrane pump liquid feed device, automatically controlled overflow mechanism and a plurality of identical configurations sprays unit; Membrane pump liquid feed device is connected in sequence by pipeline by spray tank (1), filtrator A (6), membrane pump (7), pressure transducer B (8), flow sensor A (9) and switch valve B (10), the manual overflow branch road of membrane pump takes back spray tank (1) by surplus valve (5), and the other end of switch valve B (10) connects main line; Automatically controlled overflow mechanism is connected in sequence by pipeline by switch valve A (4), pressure transducer A (3), proportional pressure control valve (2) and spray tank (1), and the other end of switch valve A (4) connects main line; Variable sprays unit one and comprises three groups of " solenoid valve+shower nozzle " combinations arranged side by side, solenoid valve E (36) is set on the front end pipeline of shower nozzle D (37), solenoid valve F (38) is set on the front end pipeline of shower nozzle E (39), solenoid valve G (40) is set on the front end pipeline of shower nozzle F (41), the other end of solenoid valve E (36), solenoid valve F (38), solenoid valve G (40) is by pipeline tandem to flow sensor B (35), and the other end of flow sensor B (35) connects main line by switch valve G (34); Variable sprays unit two and variable, and to spray unit one configuration identical, also comprise three groups of " solenoid valve+shower nozzle " combinations arranged side by side, solenoid valve H (44) is set on the front end pipeline of shower nozzle G (45), electromagnetic valve I (46) is set on the front end pipeline of shower nozzle H (47), solenoid valve J (48) is set on the front end pipeline of shower nozzle I (49), the other end of solenoid valve H (44), electromagnetic valve I (46), solenoid valve J (48) is by pipeline tandem to flow sensor C (43), and the other end of flow sensor C (43) connects main line by switch valve H (42);
It is characterized in that: in the pipeline between membrane pump (7) and pressure transducer B (8), be provided with transparent pipe section B (52), in the pipeline between proportional pressure control valve (2) and pressure transducer A (3), be provided with transparent pipe section A (51); In main line, be provided with one section of transparent pipe section C (53), and in the front and back end of transparent pipe section C (53), connect respectively pressure transducer D (15) and E (16) are set; Pipe system also comprises constant-pressure liquid supply branch road, constant voltage outlet branch road, Dynamic Characteristic of Solenoid Valve test cell, multi-source pressure surge coupling characteristic test unit.
2. PWM intermittent spraying formula variable spraying system attribute testing platform as claimed in claim 1, it is characterized in that: described constant-pressure liquid supply props up route spray tank (1), filter B (11), constant-pressure liquid supply device (12), pressure transducer C (13) and switch valve C (14) and is connected in sequence by pipeline, another termination main line of switch valve C (14), the liquid supply pressure of constant-pressure liquid supply device (12) is adjustable continuously within the scope of 0.1MPa ~ 1.0MPa, and pressure surge amplitude is within ± 0.005Mpa.
3. PWM intermittent spraying formula variable spraying system attribute testing platform as claimed in claim 1, it is characterized in that: a described constant voltage outlet route switch valve E (22) and constant voltage device for storing liquid (24) are composed in series by pipeline, another termination main line of switch valve E (22), the set pressure of constant voltage device for storing liquid (24) is adjustable continuously within the scope of 0.1MPa ~ 1.0MPa, and pressure surge amplitude is within ± 0.005Mpa.
4. PWM intermittent spraying formula variable spraying system attribute testing platform as claimed in claim 1, it is characterized in that: described Dynamic Characteristic of Solenoid Valve test cell is connected in sequence by pipeline by switch valve D (17), pressure transducer F (18), transparent pipe section D (54), solenoid valve A (19), transparent pipe section E (55), pressure transducer G (20) and shower nozzle A (21) another termination main line of switch valve D (17).
5. PWM intermittent spraying formula variable spraying system attribute testing platform as claimed in claim 1, it is characterized in that: described multi-source pressure surge coupling characteristic test unit comprises three branch roads, branch road one is by pressure transducer H (26), solenoid valve B (27) and constant voltage device for storing liquid (24) are connected in sequence by pipeline, branch road two is by pressure transducer I (28), solenoid valve C (29) and shower nozzle B (30) are connected in sequence by pipeline, branch road three is by pressure transducer J (31), solenoid valve D (32), shower nozzle C (33) is connected in sequence by pipeline, between branch road one and branch road two, by transparent pipe section F (56), connect, between branch road two and branch road three, by transparent pipe section G (57), connect, branch road three is also connected to switch valve F (25) by pipeline, another termination main line of switch valve F (25).
6. the PWM intermittent spraying formula variable spraying system attribute testing platform as described in claim 1,4 or 5, is characterized in that: described membrane pump (7), proportional pressure control valve (2), solenoid valve A (19), transparent pipe section C (53), transparent pipe section F (56) and transparent pipe section G (57) are all detachably replaced by the similar device of different structure, response characteristic or material parameter.
7. the PWM intermittent spraying formula variable spraying system attribute testing platform as described in claim 1,4 or 5, is characterized in that: the test that high-speed image acquisition system or flow field test system carry out pipeline interior flow field characteristic all can be installed in described outside, all transparent pipes section.
8. as claim 1, 2, PWM intermittent spraying formula variable spraying system attribute testing platform described in 4 or 5, it is characterized in that: described TT&C system comprises industrial computer (61), A/D transition card (63) is installed in industrial computer (61), pwm signal output card (64) and D/A transition card (65), display (62) is electrically connected to industrial computer (61), the output signal of all pressure transducers and all flow sensors is electrically connected to signal condition unit (66), signal condition unit (66) is electrically connected to A/D transition card (63), the output signal of pwm signal output card (64) is connected respectively to each solenoid valve after power output module (67) amplifies, the output signal of D/A transition card (65) is control ratio surplus valve (2) after amplifier (68) amplifies.
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| CN104255693A (en) * | 2014-09-18 | 2015-01-07 | 江苏大学 | Device and method for stably controlling spray pressure of variable spraying system |
| CN105676690A (en) * | 2016-01-11 | 2016-06-15 | 浙江大学 | PWM-based intelligent solenoid valve control system and method thereof |
| CN105676690B (en) * | 2016-01-11 | 2018-06-19 | 浙江大学 | A kind of solenoid valve intelligence control system and its method based on voltage PWM |
| CN105594679A (en) * | 2016-02-24 | 2016-05-25 | 山东省农业机械科学研究院 | Precise variable mist-spraying test device based on or including electric pump rotating speed regulation |
| CN107422701A (en) * | 2017-05-23 | 2017-12-01 | 江苏大学 | A kind of PWM variable farm chemical applying machines job state online evaluation and optimization system |
| CN107422701B (en) * | 2017-05-23 | 2020-06-09 | 江苏大学 | PWM variable pesticide application machine operation state online evaluation and optimization system |
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