CN106194688A - Agriculture fills metering control system and control method thereof - Google Patents
Agriculture fills metering control system and control method thereof Download PDFInfo
- Publication number
- CN106194688A CN106194688A CN201610709112.3A CN201610709112A CN106194688A CN 106194688 A CN106194688 A CN 106194688A CN 201610709112 A CN201610709112 A CN 201610709112A CN 106194688 A CN106194688 A CN 106194688A
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- Prior art keywords
- operational amplifier
- resistance
- pin
- conversion chip
- controller
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Classifications
-
- 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
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
-
- 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
- F04B49/02—Stopping, starting, unloading or idling control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
Abstract
The open a kind of agriculture of the present invention fills metering control system and control method thereof, including motor-pumped well and bendway, is provided with fluid level transmitter in bendway, and fluid level transmitter is connected with controller, and controller is connected with the water pump that draws water.Control method includes S1: offer bendway by motor-pumped well, sets fluid level transmitter in bendway；S2: controller arranges minimum controlling the water circulation place value and obtains the liquid level signal of fluid level transmitter；S3: judge that liquid level signal, whether less than minimum controlling the water circulation place value, is to switch off the pump and return S2；Otherwise enter S4；S4: controller detection water pump is the most in running order, is to enter S6；Otherwise enter step S5；S5: controller controls to start water pump and enters back into step S6；S6: the time delay m second, return S2.Beneficial effect: install and change conveniently, it is to avoid fluid level transmitter is wound around collision in other equipment；Fluid level transmitter Level Detection precision is high；Error is little, and service life is long；Transmission range is long, and signal attenuation degree is little, and accuracy of detection is high.
Description
Technical field
The present invention relates to water level detecting technical field, specifically, be that a kind of agriculture fills metering control system and controlling party thereof
Method.
Background technology
Subsoil water is the northern area of China and the important resource of water supply in many cities.People usually use at drifter drill for underground
Well, groundwater abstraction from motor-pumped well, meet people's drinking water and agricultural irrigation.Agricultural irrigation is fetched water, and water consumption is big, motor-pumped well
The most deeply, and the moment needs to detect the water level of motor-pumped well, and in the prior art, people are often by level transmitting
Device direct plunges into motor-pumped well, detects water level, but owing to general motor-pumped well space is little, suction pump and drinking-water pipe in addition
Take up room relatively big, cause motor-pumped well space less, during putting into fluid level transmitter, fluid level transmitter easily and draws water
Pipe collides or is wound around, and throws in difficulty greatly, and is likely to result in the damage of fluid level transmitter, drinking-water pipe, suction pump, causes
Fluid level transmitter is short for service life, and motor-pumped well Level Detection precision is low, and control system of drawing water controls weak effect, it is impossible to meet people's
Demand.
Summary of the invention
In order to solve the problems referred to above, the present invention proposes a kind of agriculture and fills metering control system and control method thereof, by motor-pumped well
Offering bendway, this tank bore is much smaller than motor-pumped well, only holds a fluid level transmitter and inserts, remains in underground and motor-pumped well one
The height of water level caused.Fluid level transmitter is placed in this bendway, for testing machine Well Water Level, thus controls water pump and open and close
Close, simultaneously effective avoid and directly fluid level transmitter is placed in motor-pumped well, touch with the water pump in motor-pumped well and other equipment
Hit or be wound around, extend the service life of motor-pumped well equipment and fluid level transmitter.
For reaching above-mentioned purpose, the concrete technical scheme that the present invention uses is as follows:
A kind of agriculture fills metering control system, and it it is critical only that: includes motor-pumped well and bendway, is provided with in described bendway
Fluid level transmitter, described fluid level transmitter is connected with controller, for liquid level signal is sent to described controller, described control
Device is also connected with water pump, and described water pump is for extracting the water in described motor-pumped well.
By above-mentioned design, fluid level transmitter is arranged in bendway, and fluid level transmitter is installed simple and convenient, it is to avoid liquid
Equipment in position transmitter and motor-pumped well is wound around and collision, and can the liquid level in Real-time Collection motor-pumped well be believed by fluid level transmitter
Number, and it being sent to controller, controller can control the start and stop of water pump in real time by the liquid level signal got, it is achieved intelligence control
System, it is simple to people's groundwater abstraction, whole pump process is without manual operation, simple and convenient.
Further describing, described fluid level transmitter includes sealing containment vessel, and one end of described sealing containment vessel is provided with props up
Support arrangement, is provided with pressure transducer in described sealing containment vessel, described pressure transducer is configured to be sealed on containment vessel
Pressure port communicates with the external world, and the signal of described pressure transducer collection is sent to described after pressure signal processing circuit plate processes
Controller.
Use such scheme, the pressure transducer communicated with extraneous well water by pressure port, can realize pressure in water
Gathering, the liquid-level pressure signal of pressure transducer collection is sent to controller after pressure signal processing circuit plate processes, and controls
Device controls water pump start and stop according to the liquid level signal obtained, and whole signals transmission, transmission path do not hinder, and transmission signal is accurate
Really, degree of accuracy is high；And by support means, whole fluid level transmitter can be supported, prevent fluid level transmitter to be absorbed in mud and work as
In, improve the accuracy of detection of fluid level transmitter, extend the service life of fluid level transmitter.
Further describe, in described fluid level transmitter, be additionally provided with communicating circuit plate, this communicating circuit plate and described pressure
Force signal processes circuit board and connects, and described communicating circuit plate is also connected with one end of cable, and the other end of described cable passes institute
The one end stating sealing containment vessel is connected with the liquid level circuit board in described water meter, and the liquid level signal of described liquid level circuit board is sent to
Described controller.
Using such scheme, communicating circuit plate, by realizing transmitting at a distance by cable after signal processing, is transmitted across
Cheng Zhong, liquid-level pressure signal attenuation degree is little, makes accuracy of detection high, and cable and water meter connect, the liquid level circuit in water meter
Liquid-level pressure signal is converted into liquid level signal by plate, and people can directly obtain motor-pumped well water level according to this signal, simple and convenient.
Further describe, connection seat that described support means includes being sequentially connected with, support bar, support seat, described connection
Seat is arranged on one end of described sealing containment vessel, and described connection seat, support seat are provided with locking nut, at described support bar
Two ends be provided with locking screw.
Using such scheme, support means supports fluid level transmitter in real time so that it is will not be absorbed in mud, and support dress
Put include being sequentially connected with connection seat, support bar, support seat, wherein connect seat, support bar, support seat all can be dismantled, if deeply
Tank does not has mud, support bar, support seat can be disassembled, make sensor construction simpler, small and exquisite, it is simple to liquid level
The installation of transmitter, and can more accurately collect water level.
Further describe, pressure signal processing circuit plate is provided with sensor and drives power circuit, signal to amplify electricity
Road, A/D convertor circuit and pressure detecting controller, described sensor drives the power input of power supply and described pressure transducer
Connecting, the pressure signal of described pressure transducer is sent to pressure detecting control through described signal amplification circuit, A/D convertor circuit
Device.
Using such scheme, when pressure transducer to be made gathers pressure signal, can control to drive power circuit to drive should
Pressure transducer works, and when pressure transducer collects pressure signal, can pass through signal amplification circuit, A/D convertor circuit biography
Delivering to pressure detecting controller, described pressure detecting controller transfers out through signal again, and whole detection process intelligence is reliable, makes
With convenient.
Further describing, described sensor drives power circuit to include the second operational amplifier U7B, described second computing
The in-phase input end of amplifier U7B is as the positive source input of described pressure transducer, described second operational amplifier U7B
In-phase input end also through the 21st resistance R21 ground connection, the inverting input of described second operational amplifier U7B is respectively through
23 resistance R23, the 28th electric capacity C28 ground connection, the inverting input of described second operational amplifier U7B is also through the 18th
Resistance R18, the 17th resistance R17 meet the first power supply VCC1, and described second operational amplifier U7B outfan is through the 19th resistance
R19, the 24th electric capacity C24 are as the positive source input of described pressure transducer, and the power supply of described pressure transducer is just
Input also colelctor electrode with the second audion Q2 in pole is connected, the base stage of described second audion Q2 and described 19th resistance
R19, the common port of the 24th electric capacity C24 connect, and the emitter stage of described second audion Q2 meets the first power supply VCC1；
The homophase input of described 18th resistance R18, the common port of the 17th resistance R17 and the first operational amplifier U7A
End connects, and the outfan of described first operational amplifier U7A is connected with the inverting input of described first operational amplifier U7A,
The outfan of described first operational amplifier U7A is also through the 22nd resistance R22 and the anti-phase input of the 3rd operational amplifier U7C
End connects, and the normal phase input end of described 3rd operational amplifier U7C is put through the 33rd electric capacity C33 ground connection, described 3rd computing
The in-phase input end of big device U7C is also connected with the negative pole signal output end of described pressure transducer, and described 3rd computing is put
The outfan of big device U7C is connected through the inverting input of the 26th resistance R26 with described 3rd operational amplifier U7C, described
The outfan of the 3rd operational amplifier U7C connects through the inverting input of the 29th resistance R29 and four-operational amplifier U7D
Connecing, the inverting input of described four-operational amplifier U7D is also through the 25th resistance R25, the 22nd resistance R22 and first
The outfan of operational amplifier U7A connects, the in-phase input end of described four-operational amplifier U7D and described pressure transducer
Positive pole signal output end connect, the in-phase input end of described four-operational amplifier U7D also through the 31st electric capacity C31 with
The in-phase input end of described 3rd operational amplifier U7C connects, and the in-phase input end of described four-operational amplifier U7D is also through the
34 electric capacity C34 ground connection, the outfan of described four-operational amplifier U7D is through the 30th resistance R30 and described 4th computing
The inverting input of amplifier U7D connects, the outfan of described four-operational amplifier U7D also through the 31st resistance R31, the
32 electric capacity C32 ground connection, the outfan of described four-operational amplifier U7D is also through the 31st resistance R31, AD conversion
Circuit is connected with pressure detecting controller.
Using such scheme, controller can be reached by this sensor and drive power circuit, the power supply to pressure transducer
It is controlled, it is only necessary to controlling sensor and drive power circuit can realize the control to pressure transducer, circuit is simple, controls
Convenient, and sensor driving power circuit low cost, power consumption is few, and service life is long.
Further describing, described communicating circuit plate is provided with communicating circuit, this communicating circuit is 485 communicating circuits,
And described communicating circuit includes 485 conversion chip U1, first pin of described 485 conversion chip U1 through the 7th resistance R7, the 5th
Resistance R5 ground connection, second pin of described 485 conversion chip U1 is connected with the 3rd pin of described 485 conversion chip U1, described
Second pin of 485 conversion chip U1 is also connected with pressure detecting controller through the 15th resistance R15, described 485 conversion chips
Second pin of U1 also connects power supply through the 6th resistance R6, second pin of described 485 conversion chip U1 also with the 3rd audion Q3
Colelctor electrode connect, the grounded emitter of described 3rd audion Q3, the base stage of described 3rd audion Q3 is through the 9th resistance R9
It is connected with the 4th pin of described 485 conversion chip U1, the 5th pin ground connection of described 485 conversion chip U1, described 485 conversions
8th pin of chip U1 connects power supply, the 8th pin of described 485 conversion chip U1 also through the second electric capacity C2 ground connection, described 485
6th pin of conversion chip U1 is connected through the 7th pin of the tenth resistance R10 with described 485 conversion chip U1, described 485 turns
The 6th pin changing chip U1 also connects power supply, the 6th pin of described 485 conversion chip U1 and two-way transition through the 8th resistance R8
One end of suppression diode Z1 connects, the other end of described two-way transient supression diode Z1 and described 485 conversion chips
7th pin of U1 connects, and the 6th pin of described 485 conversion chip U1 and the negative electrode of the second Zener diode Z2 connect, described
The plus earth of the second Zener diode Z2, the 7th pin of described 485 conversion chip U1 is through the 11st resistance R11 ground connection, institute
The negative electrode of the 7th pin and the 3rd Zener diode Z3 of stating 485 conversion chip U1 connects, described 3rd Zener diode Z3's
Plus earth, the 6th pin of described 485 conversion chip U1, the 7th pin are as the lead-in wire of described communicating circuit.
Use such scheme, 485 communicating circuits on communicating circuit plate, remote communication, and communication letter can be realized
Number attenuation is little, and reliable, equipment cost is low, long transmission distance, and transmission precision is high.
A kind of agriculture fills the control method of metering control system, and it is it is critical that comprise the following steps:
S1: offer described bendway by described motor-pumped well, fluid level transmitter is set at described bendway；
S2: described controller arranges a minimum limiting water level, and obtains the liquid level signal of described fluid level transmitter；
S3: judge that liquid level signal, whether less than minimum limiting water level, if so, switches off the pump, returns step S2；Otherwise enter
Step S4；
It is the most in running order that S4: described controller detects described water pump, if so, enters step S6；Otherwise, step is entered
Rapid S5；
S5: described controller controls to start described water pump, enters step S6；
S6: the time delay m second, return step S2.
By above-mentioned control method, by motor-pumped well, offer a bendway, fluid level transmitter is set in bendway, when needing
During water to be used, controller controls fluid level transmitter and obtains liquid level signal, and is sent to controller, and controller judges the liquid detected
Whether position is less than minimum limiting water level, and when less than minimum limiting water level, controller the most controlled controlling the water circulation pump stops pumping, if water level
Higher than minimum limiting water level, and water pump is in running order, then trigger m second, again sensed water level；If water level is higher than
Lower limit water level, water pump off position, then control water pump and start to draw water, after the m second, sensed water level situation again, so
Repeatedly, until no longer using water.Whole control method controls simple, it is not necessary to manual control water pump and fluid level transmitter, it is only necessary to
Offer bendway by motor-pumped well, can control for a long time to draw water.
Beneficial effects of the present invention: by offering bendway by motor-pumped well, and fluid level transmitter is set in bendway, makes
Motor-pumped well and fluid level transmitter are separated, it is simple to the installation of fluid level transmitter and replacing, and avoid fluid level transmitter and motor-pumped well
In equipment occur be wound around or collision；Owing to bendway environment is simple, in bendway, water does not haves fluctuation, then level transmitting
The accuracy of detection of device is high；Being provided with support means on fluid level transmitter, this support means supports fluid level transmitter and is difficult to be absorbed in silt
In mud, it is to avoid the measurement error that fluid level transmitter is caused by mud, and protect the fluid level transmitter pollution from mud,
Extend the service life of fluid level transmitter；In transmitting procedure, use 485 communication modes, be that transmission range is long, and liquid level letter
Number attenuation degree is little, makes accuracy of detection high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the control block diagram of the present invention；
Fig. 3 is the fluid level transmitter structural representation of the present invention；
Fig. 4 is the fluid level transmitter control block diagram of the present invention；
Fig. 5 is that inventive sensor drives power circuit diagram；
Fig. 6 is the controller controling circuit figure of the present invention；
Fig. 7 is communicating circuit figure of the present invention；
Fig. 8 is the control flow chart of the present invention.
Detailed description of the invention
Detailed description of the invention and operation principle to the present invention are described in further detail below in conjunction with the accompanying drawings.
From Fig. 1 and Fig. 2 it can be seen that a kind of agriculture fills metering control system, including motor-pumped well 1 and bendway 2, at bendway 2
Inside being provided with fluid level transmitter 3, fluid level transmitter 3 is connected with controller 5, for liquid level signal is sent to controller 5, controls
Device 5 is also connected with water pump 6, and water pump 6 is for extracting the water in motor-pumped well 1.
From figure 3, it can be seen that fluid level transmitter 3 includes sealing containment vessel 31, one end of sealing containment vessel 31 is provided with props up
Support arrangement 32, is provided with pressure transducer 33 in sealing containment vessel 31, and pressure transducer 33 is configured to be sealed on containment vessel 31
Pressure port 34 communicate with the external world, pressure transducer 33 gather signal through pressure signal processing circuit plate 35 process after be sent to
Controller 5.
From fig. 3 it can also be seen that be additionally provided with communicating circuit plate 36 in fluid level transmitter 3, this communicating circuit plate 36 and pressure
Force signal processes circuit board 35 and connects, and communicating circuit plate 36 also one end with cable 8 is connected, and the other end of cable 8 passes sealing
One end of containment vessel 31 is connected with the liquid level circuit board 71 in water meter 7, and the liquid level signal of liquid level circuit board 71 is sent to controller
5。
From fig. 3 it can also be seen that support means 32 includes the connection seat 32a being sequentially connected with, support bar 32b, supports seat
32c, connects seat 32a and is arranged on the one end sealing containment vessel 1, connects and is provided with locking nut on seat 32a, support seat 32c,
The two ends of support bar 32b are provided with locking screw.
From from fig. 3 it can also be seen that be additionally provided with battery settling groove in sealing containment vessel 31, battery settling groove is provided with electricity
Pond, battery is powered to pressure transducer 33, pressure signal processing circuit plate 35 and communicating circuit plate 36.
From from fig. 3 it can also be seen that water meter 7 includes housing, the sidewall of housing being provided with liquid level joint, cable passes liquid
Position joint is connected with the liquid level circuit board 71 in housing, and is additionally provided with battery in this water meter 7 and powers, and is additionally provided with wireless
Transceiver module, it is achieved wireless receiving and transmission liquid level signal, it is achieved be wirelessly transferred, this water meter 7 can be additionally used in detection water acquisition volume
Flow, and water acquisition data are uploaded to controller on water meter 7 outer wall, are additionally provided with display module, it is used for showing liquid level and water acquisition
Flow velocity.
From from fig. 3 it can also be seen that be all provided with at the cable place of passing and liquid level adapter lead perforating position sealing containment vessel 31
Being equipped with sealing structure, seal structure and include three grades of shoulder holes, gland nut, pad and plug, gland nut is set in three grades
In the macropore of shoulder hole, between mesopore step and the gland nut of three grades of shoulder holes, it is arranged with plug, pad, pad and compression
Swivel nut abuts against, and the mesopore step of plug and three grades of shoulder holes abuts against, and cable is through the gland nut in three grades of shoulder holes, pad
Sheet and plug.
Power circuit, signal is driven to amplify from fig. 4, it can be seen that be provided with sensor on pressure signal processing circuit plate 35
Circuit, A/D convertor circuit and pressure detecting controller, sensor drives power supply to be connected with the power input of pressure transducer 33,
The pressure signal of pressure transducer 33 is sent to pressure detecting controller through signal amplification circuit, A/D convertor circuit.
From fig. 5, it can be seen that sensor drives power circuit to include the second operational amplifier U7B, the second operational amplifier
The in-phase input end of U7B is as the positive source input of pressure transducer 33, the in-phase input end of the second operational amplifier U7B
Also through the 21st resistance R21 ground connection, the inverting input of the second operational amplifier U7B respectively through the 23rd resistance R23,
28 electric capacity C28 ground connection, the inverting input of the second operational amplifier U7B is also through the 18th resistance R18, the 17th resistance
R17 meets the first power supply VCC1, and the second operational amplifier U7B outfan is through the 19th resistance R19, the 24th electric capacity C24 conduct
The positive source input of pressure transducer 33, the positive source input of pressure transducer 33 also with the collection of the second audion Q2
Electrode connects, and the base stage of the second audion Q2 is connected with the 19th resistance R19, the common port of the 24th electric capacity C24, and the two or three
The emitter stage of pole pipe Q2 meets the first power supply VCC1；
The in-phase input end of the 18th resistance R18, the common port of the 17th resistance R17 and the first operational amplifier U7A is even
Connecing, the outfan of the first operational amplifier U7A and the inverting input of the first operational amplifier U7A connect, the first operation amplifier
The outfan of device U7A is also through the inverting input connection of the 22nd resistance R22 and the 3rd operational amplifier U7C, the 3rd computing
The normal phase input end of amplifier U7C through the 33rd electric capacity C33 ground connection, the in-phase input end of the 3rd operational amplifier U7C also with
The negative pole signal output end of pressure transducer 33 connects, and the outfan of the 3rd operational amplifier U7C is through the 26th resistance
The inverting input of R26 and the 3rd operational amplifier U7C connects, and the outfan of the 3rd operational amplifier U7C is through the 29th electricity
The inverting input connection of resistance R29 and four-operational amplifier U7D, the inverting input of four-operational amplifier U7D is also through the
The outfan of 25 resistance R25, the 22nd resistance R22 and the first operational amplifier U7A connects, four-operational amplifier
The in-phase input end of U7D is connected with the positive pole signal output end of pressure transducer 33, the homophase of four-operational amplifier U7D
Input is also through the in-phase input end connection of the 31st electric capacity C31 and the 3rd operational amplifier U7C, four-operational amplifier
The in-phase input end of U7D is also through the 34th electric capacity C34 ground connection, and the outfan of four-operational amplifier U7D is through the 30th resistance
The inverting input of R30 and four-operational amplifier U7D connects, and the outfan of four-operational amplifier U7D is also through the 31st
Resistance R31, the 32nd electric capacity C32 ground connection, the outfan of four-operational amplifier U7D also turns through the 31st resistance R31, AD
Change circuit to be connected with pressure detecting controller.
In conjunction with Fig. 6 and Fig. 7 it can be seen that the 30th triangle of controller control chip, the 34th jiao, the 35th
Angle, the 30th hexagonal respectively at sensor drive power circuit A/D convertor circuit in the hexagonal of AD conversion chip, first jiao,
Heptangle, the 9th jiao of connection.
From figure 7 it can be seen that be provided with communicating circuit on communicating circuit plate 36, this communicating circuit is 485 communication modes, will
Communication interface is converted into private communication interface.And communicating circuit includes that 485 conversion chip U1, the first of 485 conversion chip U1 draw
Foot draws through the 7th resistance R7, the 5th resistance R5 ground connection, second pin of 485 conversion chip U1 and the 3rd of 485 conversion chip U1
Foot connects, and second pin of 485 conversion chip U1 is also connected with pressure detecting controller through the 15th resistance R15,485 conversion cores
Second pin of sheet U1 also connects power supply through the 6th resistance R6, and second pin of 485 conversion chip U1 is also with the 3rd audion Q3's
Colelctor electrode connects, the grounded emitter of the 3rd audion Q3, and the base stage of the 3rd audion Q3 is through the 9th resistance R9 and 485 conversion core
4th pin of sheet U1 connects, the 5th pin ground connection of 485 conversion chip U1, and the 8th pin of 485 conversion chip U1 connects power supply,
8th pin of 485 conversion chip U1 is also through the second electric capacity C2 ground connection, and the 6th pin of 485 conversion chip U1 is through the tenth resistance
7th pin of R10 and 485 conversion chip U1 connects, and the 6th pin of 485 conversion chip U1 also connects power supply through the 8th resistance R8,
6th pin of 485 conversion chip U1 is connected with one end of two-way transient supression diode Z1, two-way transient supression diode Z1
The other end and 485 conversion chip U1 the 7th pin connect, the 6th pin of 485 conversion chip U1 and the second Zener diode
The negative electrode of Z2 connects, and the plus earth of the second Zener diode Z2, the 7th pin of 485 conversion chip U1 is through the 11st resistance
R11 ground connection, the 7th pin of 485 conversion chip U1 and the negative electrode of the 3rd Zener diode Z3 connect, the 3rd Zener diode Z3
Plus earth, the 6th pin of 485 conversion chip U1, the 7th pin are as the lead-in wire of communicating circuit.
From figure 8, it is seen that a kind of agriculture fills the control method of metering control system, comprise the following steps:
S1: offer bendway 2 on motor-pumped well 1 side, fluid level transmitter 3 is set at bendway 2；
S2: controller 5 arranges a minimum limiting water level, and obtains the liquid level signal of fluid level transmitter 3；
S3: judge that liquid level signal, whether less than minimum limiting water level, if so, switches off the pump 6, return step S2；Otherwise enter
Enter step S4；
It is the most in running order that S4: controller 5 detects water pump 6, if so, enters step S6；Otherwise, step S5 is entered；
S5: controller 5 controls to start water pump 6, enters step S6；
S6: the time delay m second, return step S2.
In the present embodiment, m=30.
In implementation process, also can pre-set motor-pumped well early warning water level L0, generally between 20 meters～50 meters, level transmitting
The actual water storage water level L1 that device detection obtains, measures the hole diameter D of the motor-pumped well obtained, thus can calculate maximum water withdrawal；Known
The rated output power of water pump, average instantaneous delivery speed V i.e. fetched water, water pump early warning shut-in time t can be drawn；
When water intaking water pump is opened, and system enters countdown, after arriving the early warning shut-in time, control system automatic closing water
Pump, thus avoid motor-pumped well water all to be drained, damage equipment, it is ensured that the effective and reliability of whole system.
The operation principle of the present invention:
Offering bendway by motor-pumped well, arrange fluid level transmitter in bendway, the pressure transducer of this fluid level transmitter will
The pressure signal detected in real time is converted into liquid level signal passes through pressure signal processing circuit plate, communicating circuit plate, cable, water meter
Delivering to controller, controller, according to the liquid level signal received, controls starting mode of pump or stopping: when fluid level transmitter detects water
When position is too low, after controller controls water pump and quits work, and motor-pumped well water level refluxes, and fluid level transmitter detects that liquid level raises, can
Control water pump to start working.
Claims (8)
1. an agriculture fills metering control system, it is characterised in that: include motor-pumped well (1) and bendway (2), in described bendway (2)
Inside being provided with fluid level transmitter (3), described fluid level transmitter (3) is connected with controller (5), for liquid level signal is sent to institute
Stating controller (5), described controller (5) is also connected with water pump (6), and described water pump (6) is used for extracting in described motor-pumped well (1)
Water.
Agriculture the most according to claim 1 fills metering control system, it is characterised in that described fluid level transmitter (3) includes close
Envelope containment vessel (31), one end of described sealing containment vessel (31) is provided with support means (32), in described sealing containment vessel (31)
Be provided with pressure transducer (33), described pressure transducer (33) configured the pressure port (34) sealed on containment vessel (31) with
The external world communicates, and the signal that described pressure transducer (33) gathers is sent to described after pressure signal processing circuit plate (35) processes
Controller (5).
Agriculture the most according to claim 2 fills metering control system, it is characterised in that described fluid level transmitter also sets in (3)
Being equipped with communicating circuit plate (36), this communicating circuit plate (36) is connected with described pressure signal processing circuit plate (35), described communication
Circuit board (36) also one end with cable (8) is connected, and the other end of described cable (8) passes the one of described sealing containment vessel (31)
End is connected with the liquid level circuit board (71) in described water meter (7), and the liquid level signal of described liquid level circuit board (71) is sent to described
Controller (5).
Agriculture the most according to claim 2 fills metering control system, it is characterised in that described support means (32) includes successively
The connection seat (32a) of connection, support bar (32b), support seat (32c), described connection seat (32a) is arranged on described sealing containment vessel
(1) one end, described connection seat (32a), support seat (32c) are provided with locking nut, at the two of described support bar (32b)
End is provided with locking screw.
Agriculture the most according to claim 1 fills metering control system, it is characterised in that on pressure signal processing circuit plate (35)
Being provided with sensor and drive power circuit, signal amplification circuit, A/D convertor circuit and pressure detecting controller, described sensor drives
Galvanic electricity source is connected with the power input of described pressure transducer (33), and the pressure signal of described pressure transducer (33) is through described
Signal amplification circuit, A/D convertor circuit are sent to pressure detecting controller.
Agriculture the most according to claim 5 fills metering control system, it is characterised in that described sensor drives power circuit bag
Including the second operational amplifier U7B, the in-phase input end of described second operational amplifier U7B is as described pressure transducer (33)
Positive source input, the in-phase input end of described second operational amplifier U7B is also through the 21st resistance R21 ground connection, described
The inverting input of the second operational amplifier U7B respectively through the 23rd resistance R23, the 28th electric capacity C28 ground connection, described
The inverting input of two operational amplifier U7B also meets the first power supply VCC1 through the 18th resistance R18, the 17th resistance R17, described
Second operational amplifier U7B outfan through the 19th resistance R19, the 24th electric capacity C24 as described pressure transducer (33)
Positive source input, the positive source input of described pressure transducer (33) is also with the colelctor electrode of the second audion Q2 even
Connecing, the base stage of described second audion Q2 is connected with described 19th resistance R19, the common port of the 24th electric capacity C24, described
The emitter stage of the second audion Q2 meets the first power supply VCC1；
The in-phase input end of described 18th resistance R18, the common port of the 17th resistance R17 and the first operational amplifier U7A is even
Connecing, the outfan of described first operational amplifier U7A is connected with the inverting input of described first operational amplifier U7A, described
The outfan of the first operational amplifier U7A is also through the inverting input company of the 22nd resistance R22 and the 3rd operational amplifier U7C
Connecing, the normal phase input end of described 3rd operational amplifier U7C is through the 33rd electric capacity C33 ground connection, described 3rd operational amplifier
The in-phase input end of U7C also negative pole signal output end with described pressure transducer (33) is connected, and described 3rd computing is put
The outfan of big device U7C is connected through the inverting input of the 26th resistance R26 with described 3rd operational amplifier U7C, described
The outfan of the 3rd operational amplifier U7C connects through the inverting input of the 29th resistance R29 and four-operational amplifier U7D
Connecing, the inverting input of described four-operational amplifier U7D is also through the 25th resistance R25, the 22nd resistance R22 and first
The outfan of operational amplifier U7A connects, the in-phase input end of described four-operational amplifier U7D and described pressure transducer
(33) positive pole signal output end connects, and the in-phase input end of described four-operational amplifier U7D is also through the 31st electricity
The in-phase input end holding C31 and described 3rd operational amplifier U7C is connected, the homophase input of described four-operational amplifier U7D
End also through the 34th electric capacity C34 ground connection, the outfan of described four-operational amplifier U7D through the 30th resistance R30 with described
The inverting input of four-operational amplifier U7D connects, and the outfan of described four-operational amplifier U7D is also through the 31st electricity
Resistance R31, the 32nd electric capacity C32 ground connection, the outfan of described four-operational amplifier U7D is also through the 31st resistance
R31, A/D convertor circuit are connected with pressure detecting controller.
Agriculture the most according to claim 3 fills metering control system, it is characterised in that described communicating circuit plate (36) is upper to be arranged
Having communicating circuit, this communicating circuit is 485 communicating circuits, and described communicating circuit includes 485 conversion chip U1, described 485 turns
Change first pin of chip U1 through the 7th resistance R7, the 5th resistance R5 ground connection, second pin of described 485 conversion chip U1 and institute
State 485 conversion chip U1 the 3rd pin connect, second pin of described 485 conversion chip U1 also through the 15th resistance R15 with
Pressure detecting controller connects, and second pin of described 485 conversion chip U1 also connects power supply through the 6th resistance R6, described 485 turns
Change second pin of the chip U1 colelctor electrode also with the 3rd audion Q3 to be connected, the grounded emitter of described 3rd audion Q3,
The base stage of described 3rd audion Q3 is connected through the 4th pin of the 9th resistance R9 with described 485 conversion chip U1, described 485 turns
Changing the 5th pin ground connection of chip U1, the 8th pin of described 485 conversion chip U1 connects power supply, described 485 conversion chip U1's
8th pin is also through the second electric capacity C2 ground connection, and the 6th pin of described 485 conversion chip U1 is through the tenth resistance R10 and described 485
7th pin of conversion chip U1 connects, and the 6th pin of described 485 conversion chip U1 also connects power supply through the 8th resistance R8, described
6th pin of 485 conversion chip U1 is connected with one end of two-way transient supression diode Z1, described two-way transient supression two pole
The other end of pipe Z1 is connected with the 7th pin of described 485 conversion chip U1, the 6th pin of described 485 conversion chip U1
It is connected with the negative electrode of the second Zener diode Z2, the plus earth of described second Zener diode Z2, described 485 conversion chip U1
The 7th pin through the 11st resistance R11 ground connection, the 7th pin of described 485 conversion chip U1 and the 3rd Zener diode Z3's
Negative electrode connects, the plus earth of described 3rd Zener diode Z3, the 6th pin of described 485 conversion chip U1, the 7th pin
Lead-in wire as described communicating circuit.
8. the control method of an agriculture as claimed in claim 3 filling metering control system, it is characterised in that include following step
Rapid:
S1: offer described bendway (2) on described motor-pumped well (1) side, fluid level transmitter (3) is set at described bendway (2)；
S2: described controller (5) arranges a minimum limiting water level, and obtains the liquid level signal of described fluid level transmitter (3)；
S3: judge whether liquid level signal is less than minimum limiting water level, if so, switch off the pump (6), returns step S2；Otherwise enter
Step S4；
S4: it is the most in running order that described controller (5) detects described water pump (6), if so, enters step S6；Otherwise, enter
Step S5；
S5: described controller (5) controls to start described water pump (6), enters step S6；
S6: the time delay m second, return step S2.
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| CN201610709112.3A CN106194688B (en) | 2016-08-23 | 2016-08-23 | Agriculture fills metering control system and its control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610709112.3A CN106194688B (en) | 2016-08-23 | 2016-08-23 | Agriculture fills metering control system and its control method |
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| CN106194688A true CN106194688A (en) | 2016-12-07 |
| CN106194688B CN106194688B (en) | 2017-11-21 |
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| Publication number | Publication date |
|---|---|
| CN106194688B (en) | 2017-11-21 |
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