CN206144769U - Metering control device is irritated in farming - Google Patents
Metering control device is irritated in farming Download PDFInfo
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- CN206144769U CN206144769U CN201620924794.5U CN201620924794U CN206144769U CN 206144769 U CN206144769 U CN 206144769U CN 201620924794 U CN201620924794 U CN 201620924794U CN 206144769 U CN206144769 U CN 206144769U
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Abstract
The utility model discloses a metering control device is irritated in farming, including motor -pumped well (1) and deep water tank (2) be provided with liquid level changer (3) in deep water tank (2), liquid level changer (3) are connected with controller (5) for with liquid level signal transfer extremely controller (5), controller (5) still are connected with water pump (6), water pump (6) are used for the extraction water in motor -pumped well (1). Beneficial effect: the installation is convenient with the change, has avoided liquid level changer in other equipment winding collisions, liquid level changer liquid level detection precision is high, the error is little, long service life, transmission distance is long, and the signal attenuation degree is little, and it is high to detect the precision.
Description
Technical field
The utility model is related to water level detecting technical field, is that a kind of agriculture fills metering control specifically.
Background technology
Underground water is the important resource of water supply in the northern area of China and many cities.People are usually adopted in drifter drill for underground
Well, groundwater abstraction is meeting people's drinking water and agricultural irrigation from motor-pumped well.Agricultural irrigation is fetched water, and water consumption is big, motor-pumped well
It is often relatively deep, and the moment need to detect the water level of motor-pumped well that and in the prior art, people are often by level transmitting
Device is direct plungeed into into motor-pumped well, and water level is detected, but due to general motor-pumped well space it is little, suction pump and drinking-water pipe in addition
Take up room larger, cause motor-pumped well space less, during input fluid level transmitter, fluid level transmitter easily and draws water
Pipe collides or winds, 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 service life is short, and motor-pumped well level sensing precision is low, and control system of drawing water control effect is poor, it is impossible to meet people's
Demand.
Utility model content
In order to solve the above problems, the utility model proposes a kind of agriculture fills metering control, deep water is opened up by motor-pumped well
Groove, the tank bore is much smaller than motor-pumped well, only holds a fluid level transmitter and inserts, and in underground the water level consistent with motor-pumped well is remained
Highly.Fluid level transmitter is placed in the bendway, for detection machine Well Water Level, is opened and closed so as to control water pump, while
Efficiently avoid and directly fluid level transmitter is placed in motor-pumped well, with motor-pumped well in water pump and other equipment collide or twine
Around extending the service life of motor-pumped well equipment and fluid level transmitter.
To reach above-mentioned purpose, the concrete technical scheme that the utility model is adopted is as follows：
A kind of agriculture fills metering control, and it is critical only that：Including motor-pumped well and bendway, it is provided with the bendway
Fluid level transmitter, the fluid level transmitter is connected with controller, for liquid level signal to be sent to into the controller, the control
Device is also connected with water pump, and the water pump is used to extract the water in the 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 winding in position transmitter and motor-pumped well and collide, and can be in Real-time Collection motor-pumped well by fluid level transmitter liquid level letter
Number, and controller is sent to, controller can pass through the start and stop of the liquid level signal real-time control water pump for getting, and realize intelligence control
System, is easy to people's groundwater abstraction, and whole pump process is simple and convenient without the need for manually operating.
Further describe, the fluid level transmitter includes sealing containment vessel, one end of the sealing containment vessel is provided with props up
Support arrangement, is provided with pressure sensor in the sealing containment vessel, the pressure sensor is configured on sealing containment vessel
Pressure port is communicated with the external world, and the signal that the pressure sensor is gathered is sent to described Jing after the process of pressure signal processing circuit plate
Controller.
Using such scheme, the pressure sensor communicated with extraneous well water by pressure port, it is capable of achieving to pressure in water
Collection, the liquid-level pressure signal of pressure sensor collection is sent to controller Jing after the process of pressure signal processing circuit plate, controls
Device does not hinder according to the liquid level signal control water pump start and stop for obtaining, whole signals transmission, transmission path, and transmission signal is accurate
Really, accuracy is high；And by support meanss, whole fluid level transmitter can be supported, prevent fluid level transmitter to be absorbed in mud and work as
In, the accuracy of detection of fluid level transmitter is improve, extend the service life of fluid level transmitter.
Further describe, communicating circuit plate is additionally provided with the fluid level transmitter, the communicating circuit plate and the pressure
Force signal process circuit plate connects, and the communicating circuit plate is also connected with one end of cable, and the other end of the cable passes institute
The one end for stating sealing containment vessel is connected with the liquid level circuit board in water meter, and the liquid level signal of the liquid level circuit board is sent to institute
State controller.
Using such scheme, communicating circuit plate will be capable of achieving transmission at a distance after signal transacting by cable, be transmitted across
Cheng Zhong, liquid-level pressure signal attenuation degree is little, makes accuracy of detection high, and cable and water meter connection, 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 the signal, simple and convenient.
Further describe, the support meanss include connecting seat, support bar, the support base being sequentially connected, the connection
Seat is arranged on one end of the sealing containment vessel, locking nut is provided with the connecting seat, support base, in the support bar
Two ends be provided with locking screw.
Using such scheme, support meanss support in real time fluid level transmitter so as to will not be absorbed in mud, and support dress
Put including connecting seat, support bar, the support base being sequentially connected, wherein connecting seat, support bar, support base can be dismantled, if deep
Without mud in tank, support bar, support base can be disassembled, make sensor construction simpler, compact, be easy to liquid level
The installation of transmitter, and can more accurately collect water level.
Further describe, sensor driving power supply circuit, signal are provided with pressure signal processing circuit plate and amplify electricity
Road, A/D converter circuit and pressure detecting controller, the power input of the sensor driving power supply and the pressure sensor
Connection, signal amplification circuit, A/D converter circuit are sent to pressure detecting control described in the pressure signal Jing of the pressure sensor
Device.
Using such scheme, when to make pressure sensor collection pressure signal, can control driving power supply circuit drives should
Pressure sensor works, and when pressure sensor collects pressure signal, can be passed by signal amplification circuit, A/D converter circuit
Pressure detecting controller is delivered to, the pressure detecting controller again go out by Jing signal transmissions, whole detection process intelligence is reliable, makes
With conveniently.
Further describe, the sensor driving power supply circuit includes the second operational amplifier U7B, second fortune
Calculate the positive source input of the in-phase input end as the pressure sensor of amplifier U7B, second operational amplifier
The in-phase input end of the U7B also resistance R21 of Jing the 21st are grounded, the inverting input difference of the second operational amplifier U7B
The resistance R23 of Jing the 23rd, the 28th electric capacity C28 are grounded, the inverting input also Jing of the second operational amplifier U7B the
18 resistance R18, the 17th resistance R17 meet the first power supply VCC1, and the second operational amplifier U7B output ends Jing the 19th are electric
R19, the 24th electric capacity C24 are hindered as the positive source input of the pressure sensor, the power supply of the pressure sensor
Electrode input end is also connected with the colelctor electrode of the second triode Q2, the base stage of the second triode Q2 and the 19th resistance
The common port connection of R19, the 24th electric capacity C24, the emitter stage of the second triode Q2 meets the first power supply VCC1；
The homophase input of the 18th resistance R18, the common port of the 17th resistance R17 and the first operational amplifier U7A
End connection, the output end of the first operational amplifier U7A is connected with the inverting input of the first operational amplifier U7A,
The output end of the first operational amplifier U7A also anti-phase input of the resistance R22 of Jing the 22nd and the 3rd operational amplifier U7C
End connection, the electric capacity C33 of normal phase input end Jing the 33rd ground connection of the 3rd operational amplifier U7C, the 3rd computing is put
The in-phase input end of big device U7C is also connected with the negative pole signal output end of the pressure sensor, and the 3rd computing is put
The resistance R26 of output end Jing the 26th of big device U7C is connected with the inverting input of the 3rd operational amplifier U7C, described
The inverting input of output end Jing the 29th the resistance R29 and four-operational amplifier U7D of the 3rd operational amplifier U7C connects
Connect, inverting input also the resistance R25 of Jing the 25th, the 22nd resistance R22 and first of the four-operational amplifier U7D
The output end connection of operational amplifier U7A, in-phase input end and the pressure sensor of the four-operational amplifier U7D
Positive pole signal output end connect, the in-phase input end also electric capacity C31 of Jing the 31st of the four-operational amplifier U7D with
The in-phase input end connection of the 3rd operational amplifier U7C, the in-phase input end also Jing of the four-operational amplifier U7D the
34 electric capacity C34 are grounded, the resistance R30 of output end Jing the 30th and the 4th computing of the four-operational amplifier U7D
The inverting input connection of amplifier U7D, resistance R31 of output end also Jing the 31st of the four-operational amplifier U7D, the
32 electric capacity C32 are grounded, output end also the resistance R31 of Jing the 31st, the A/D converter circuit of the four-operational amplifier U7D
It is connected with pressure detecting controller.
Using such scheme, controller can be reached by the sensor driving power supply circuit, the power supply to pressure sensor
It is controlled, it is only necessary to control the i.e. achievable control to pressure sensor of sensor driving power supply circuit, circuit is simple, control
It is convenient, and sensor driving power supply circuit cost is low, and power consumption is few, long service life.
Further describe, on the communicating circuit plate communicating circuit be provided with, the communicating circuit is 485 communicating circuits,
And the communicating circuit includes 485 conversion chip U1, resistance R7 of the first pin Jing the 7th of the 485 conversion chip U1, the 5th
Resistance R5 is grounded, and the second pin of the 485 conversion chip U1 is connected with the 3rd pin of the 485 conversion chip U1, described
The second pin of the 485 conversion chip U1 also resistance R15 of Jing the 15th are connected with pressure detecting controller, 485 conversion chip
The second pin of the U1 also resistance R6 of Jing the 6th connect power supply, the second pin of the 485 conversion chip U1 also with the 3rd triode Q3
Colelctor electrode connection, the grounded emitter of the 3rd triode Q3, the resistance R9 of base stage Jing the 9th of the 3rd triode Q3
It is connected with the 4th pin of the 485 conversion chip U1, the 5th pin ground connection of the 485 conversion chip U1,485 conversion
8th pin of chip U1 connects power supply, and the 8th pin also the second electric capacity of Jing C2 of the 485 conversion chip U1 is grounded, and described 485
The resistance R10 of 6th pin Jing the tenth of conversion chip U1 are connected with the 7th pin of the 485 conversion chip U1, described 485 turns
The 6th pin also resistance R8 of Jing the 8th for changing chip U1 connect power supply, the 6th pin of the 485 conversion chip U1 and two-way transition
Suppress one end connection of diode Z1, the other end of the two-way transient supression diode Z1 is with the 485 conversion chip U1's
7th pin connects, and the 6th pin of the 485 conversion chip U1 is connected with the negative electrode of the second Zener diode Z2, and described the
The plus earth of two Zener diode Z2, the resistance R11 of the 7th pin Jing the 11st ground connection of the 485 conversion chip U1 is described
7th pin of 485 conversion chip U1 is connected with the negative electrode of the 3rd Zener diode Z3, the sun of the 3rd Zener diode Z3
Pole is grounded, the lead of the 6th pin of the 485 conversion chip U1, the 7th pin as the communicating circuit.
Using such scheme, 485 communicating circuits on communicating circuit plate, communication at a distance is capable of achieving, and communicates letter
Number attenuation is little, and reliable, equipment cost is low, long transmission distance, and transmission precision is high.
The beneficial effects of the utility model：By opening up bendway by motor-pumped well, and level transmitting is set in bendway
Device, separates motor-pumped well and fluid level transmitter, is easy to the installation and replacing of fluid level transmitter, and avoid fluid level transmitter with
There is winding or collide in the equipment in motor-pumped well；Because bendway environment is simple, water is not in fluctuation in bendway, then liquid level
The accuracy of detection of transmitter is high；Support meanss are provided with fluid level transmitter, the support device fluid level transmitter is difficult to fall into
In entering mud, it is to avoid the measure error that mud is caused to fluid level transmitter, and protect fluid level transmitter from mud
Pollution, extends the service life of fluid level transmitter；485 communication modes are adopted in transmitting procedure, is that transmission range is long, and liquid
Position signal attenuation degree is little, makes accuracy of detection high.
Description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is control block diagram of the present utility model；
Fig. 3 is fluid level transmitter structural representation of the present utility model；
Fig. 4 is fluid level transmitter control block diagram of the present utility model；
Fig. 5 is the utility model sensor driving power supply circuit diagram；
Fig. 6 is controller controling circuit figure of the present utility model；
Fig. 7 is the utility model communicating circuit figure；
Specific embodiment
Specific embodiment of the present utility model and operation principle are described in further detail below in conjunction with the accompanying drawings.
A kind of agriculture is can be seen that from Fig. 1 and Fig. 2 and fill metering control, including motor-pumped well 1 and bendway 2, in bendway 2
Fluid level transmitter 3 is inside provided with, fluid level transmitter 3 is connected with controller 5, for liquid level signal to be sent to into controller 5, control
Device 5 is also connected with water pump 6, and water pump 6 is used to extract 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 sensor 33 in sealing containment vessel 31, pressure sensor 33 is configured on sealing containment vessel 31
Pressure port 34 communicate with the external world, pressure sensor 33 collection signal Jing pressure signal processing circuit plate 35 process after be sent to
Controller 5.
From fig. 3 it can also be seen that fluid level transmitter 3 in be additionally provided with communicating circuit plate 36, the communicating circuit plate 36 with pressure
Force signal process circuit plate 35 connects, and communicating circuit plate 36 is also connected with one end of cable 8, 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 meanss 32 include connecting seat 32a, support bar 32b, the support base being sequentially connected
32c, connecting seat 32a are arranged on one end of sealing containment vessel 31, and on connecting seat 32a, support base 32c locking nut is provided with,
The two ends of support bar 32b are provided with locking screw.
Battery settling groove is additionally provided with from from fig. 3 it can also be seen that sealing in containment vessel 31, battery settling groove is provided with electricity
Pond, battery to pressure sensor 33, pressure signal processing circuit plate 35 and communicating circuit plate 36 are powered.
From from fig. 3 it can also be seen that water meter 7 includes housing, liquid level joint is provided with the side wall of housing, cable passes through liquid
Position joint is connected with the liquid level circuit board 71 in housing, and is additionally provided with battery and powers the water meter 7 is interior, is additionally provided with nothing
Line transceiver module, realizes wireless receiving and sends liquid level signal, realize being wirelessly transferred, the water meter 7 can also be used to detect water acquisition body
Flow is accumulated, and water acquisition data are uploaded to into controller and be additionally provided with display module on the outer wall of water meter 7, for showing liquid level and adopting
Water flow velocity.
From from fig. 3 it can also be seen that being all provided with the cable place of passing of sealing containment vessel 31 and liquid level adapter lead perforating position
Sealing structure is equipped with, sealing structure includes three-level shoulder hole, gland nut, pad and plug, and gland nut is set in three-level
In the macropore of shoulder hole, plug, pad, pad and compression are arranged between the mesopore step and gland nut of three-level shoulder hole
Swivel nut is abutted against, and plug is abutted against with the mesopore step of three-level shoulder hole, and cable is through the gland nut in three-level shoulder hole, pad
Piece and plug.
From fig. 4, it can be seen that sensor driving power supply circuit, signal are provided with pressure signal processing circuit plate 35 amplifying
Circuit, A/D converter circuit and pressure detecting controller, sensor driving power supply is connected with the power input of pressure sensor 33,
The pressure signal Jing signal amplification circuits of pressure sensor 33, A/D converter circuit are sent to pressure detecting controller.
From fig. 5, it can be seen that sensor driving power supply circuit includes the second operational amplifier U7B, the second operational amplifier
The in-phase input end of U7B as pressure sensor 33 positive source input, the in-phase input end of the second operational amplifier U7B
The also resistance R21 of Jing the 21st are grounded, the inverting input of the second operational amplifier U7B difference resistance R23 of Jing the 23rd, the
28 electric capacity C28 are grounded, inverting input also the resistance R18 of Jing the 18th, the 17th resistance of the second operational amplifier U7B
R17 connects the first power supply VCC1, the resistance R19 of the second operational amplifier U7B output ends Jing the 19th, the 24th electric capacity C24 conducts
The positive source input of pressure sensor 33, the positive source input of pressure sensor 33 also with the collection of the second triode Q2
Electrode connects, and the base stage of the second triode Q2 is connected with the common port of the 19th resistance R19, 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 connects
Connect, the output end of the first operational amplifier U7A is connected with the inverting input of the first operational amplifier U7A, the first operation amplifier
The output end of the device U7A also resistance R22 of Jing the 22nd are connected with the inverting input of the 3rd operational amplifier U7C, the 3rd computing
The electric capacity C33 of normal phase input end Jing the 33rd ground connection of amplifier U7C, the in-phase input end of the 3rd operational amplifier U7C also with
The negative pole signal output end connection of pressure sensor 33, the resistance of output end Jing the 26th of the 3rd operational amplifier U7C
R26 is connected with the inverting input of the 3rd operational amplifier U7C, and output end Jing the 29th of the 3rd operational amplifier U7C is electric
Resistance R29 is connected with the inverting input of four-operational amplifier U7D, the inverting input also Jing of four-operational amplifier U7D the
25 resistance R25, the 22nd resistance R22 are connected with the output end of the first operational amplifier U7A, four-operational amplifier
The in-phase input end of U7D is connected with the positive pole signal output end of pressure sensor 33, the homophase of four-operational amplifier U7D
The input also electric capacity C31 of Jing the 31st are connected with the in-phase input end of the 3rd operational amplifier U7C, four-operational amplifier
The in-phase input end of the U7D also electric capacity C34 of Jing the 34th are grounded, the resistance of output end Jing the 30th of four-operational amplifier U7D
R30 is connected with the inverting input of four-operational amplifier U7D, the output end also Jing the 31st of four-operational amplifier U7D
Resistance R31, the 32nd electric capacity C32 are grounded, and output end also Jing the 31st resistance R31, AD of four-operational amplifier U7D turns
Change circuit to be connected with pressure detecting controller.
With reference to Fig. 6 and Fig. 7 can be seen that controller control chip the 30th triangle, the 34th jiao, the 35th
Angle, the 30th hexagonal in the A/D converter circuit of sensor driving power supply circuit the hexagonal of AD conversion chip, first jiao,
Heptangle, the 9th jiao of connection.
From figure 7 it can be seen that being provided with communicating circuit on communicating circuit plate 36, the communicating circuit is 485 communication modes, will
Communication interface is converted into private communication interface.And communicating circuit includes 485 conversion chip U1, the first of 485 conversion chip U1 draw
The resistance R7 of pin Jing the 7th, the 5th resistance R5 are grounded, and the second pin of 485 conversion chip U1 is drawn with the 3rd of 485 conversion chip U1 the
Pin connects, and the second pin also resistance R15 of Jing the 15th of 485 conversion chip U1 are connected with pressure detecting controller, 485 conversions
The second pin of the chip U1 also resistance R6 of Jing the 6th connect power supply, the second pin of 485 conversion chip U1 also with the 3rd triode Q3
Colelctor electrode connection, the grounded emitter of the 3rd triode Q3, the resistance R9 of base stage Jing the 9th of the 3rd triode Q3 with 485 change
The 4th pin connection of chip U1, the 5th pin ground connection of 485 conversion chip U1, the 8th pin of 485 conversion chip U1 connects electricity
Source, the 8th pin also the second electric capacity of Jing C2 ground connection of 485 conversion chip U1, the 6th pin Jing the tenth of 485 conversion chip U1 is electric
Resistance R10 is connected with the 7th pin of 485 conversion chip U1, and the 6th pin also resistance R8 of Jing the 8th of 485 conversion chip U1 connect electricity
Source, the 6th pin of 485 conversion chip U1 is connected with one end of two-way transient supression diode Z1, two-way transient supression diode
The other end of Z1 is connected with the 7th pin of 485 conversion chip U1, the 6th pin of 485 conversion chip U1 and the pole of the second voltage stabilizing two
The negative electrode connection of pipe Z2, the plus earth of the second Zener diode Z2, the resistance of the 7th pin Jing the 11st of 485 conversion chip U1
R11 is grounded, and the 7th pin of 485 conversion chip U1 is connected with the negative electrode of the 3rd Zener diode Z3, the 3rd Zener diode Z3
Plus earth, the lead of the 6th pin of 485 conversion chip U1, the 7th pin as communicating circuit.
Operation principle of the present utility model：
Open up by motor-pumped well and arrange in bendway, bendway fluid level transmitter, the pressure sensor of the fluid level transmitter will
Real-time detection to pressure signal Jing pressure signal processing circuit plates, communicating circuit plate, cable, water meter be converted into liquid level signal and pass
Controller is sent to, controller is according to the liquid level signal for receiving, control starting mode of pump or stopping：When fluid level transmitter detects water
When position is too low, controller control water pump quits work, the backflow of motor-pumped well water level, and fluid level transmitter is detected after liquid level rising, can
Control water pump is started working.
Claims (7)
1. a kind of agriculture fills metering control, it is characterised in that：Including motor-pumped well (1) and bendway (2), in the bendway (2)
Fluid level transmitter (3) is inside provided with, the fluid level transmitter (3) is connected with controller (5), for liquid level signal to be sent to into institute
Controller (5) is stated, the controller (5) is also connected with water pump (6), during the water pump (6) is for extracting the motor-pumped well (1)
Water.
2. a kind of agriculture according to claim 1 fills metering control, it is characterised in that fluid level transmitter (3) bag
Sealing containment vessel (31) is included, one end of sealing containment vessel (31) is provided with support meanss (32), the sealing containment vessel
(31) pressure sensor (33), the configured pressure port in sealing containment vessel (31) of the pressure sensor (33) are provided with
(34) communicate with the external world, the signal of pressure sensor (33) collection is transmitted Jing after pressure signal processing circuit plate (35) process
To the controller (5).
3. a kind of agriculture according to claim 2 fills metering control, it is characterised in that in the fluid level transmitter (3)
Communicating circuit plate (36) is additionally provided with, the communicating circuit plate (36) is connected with the pressure signal processing circuit plate (35), described
Communicating circuit plate (36) is also connected with one end of cable (8), and the other end of the cable (8) passes sealing containment vessel (31)
One end be connected with the liquid level circuit board (71) in water meter (7), the liquid level signal of the liquid level circuit board (71) is sent to described
Controller (5).
4. a kind of agriculture according to claim 2 fills metering control, it is characterised in that the support meanss (32) include
Connecting seat (32a), support bar (32b), the support base (32c) being sequentially connected, the connecting seat (32a) is arranged on the sealing and protects
One end of protective case (31), is provided with locking nut, in the support bar on the connecting seat (32a), support base (32c)
(32b) two ends are provided with locking screw.
5. a kind of agriculture according to claim 1 fills metering control, it is characterised in that pressure signal processing circuit plate
(35) sensor driving power supply circuit, signal amplification circuit, A/D converter circuit and pressure detecting controller, the biography are provided with
Sensor driving power supply is connected with the power input of the pressure sensor (33), the pressure signal of the pressure sensor (33)
Signal amplification circuit, A/D converter circuit are sent to pressure detecting controller described in Jing.
6. a kind of agriculture according to claim 5 fills metering control, it is characterised in that the sensor driving power supply electricity
Road includes the second operational amplifier U7B, and the in-phase input end of the second operational amplifier U7B is used as the pressure sensor
(33) positive source input, the in-phase input end also resistance R21 of Jing the 21st of the second operational amplifier U7B connect
Ground, respectively the resistance R23 of Jing the 23rd, the 28th electric capacity C28 connect the inverting input of the second operational amplifier U7B
Ground, inverting input also the resistance R18 of Jing the 18th, the 17th resistance R17 of the second operational amplifier U7B connect the first power supply
VCC1, the resistance R19 of the second operational amplifier U7B output ends Jing the 19th, the 24th electric capacity C24 are passed as the pressure
The positive source input of sensor (33), the positive source input of the pressure sensor (33) is also with the second triode Q2's
Colelctor electrode connection, the base stage of the second triode Q2 and the 19th resistance R19, the common port of the 24th electric capacity C24
Connection, the emitter stage of the second triode 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 connects
Connect, the output end of the first operational amplifier U7A is connected with the inverting input of the first operational amplifier U7A, described
The inverting input of the output end of the first operational amplifier U7A also resistance R22 of Jing the 22nd and the 3rd operational amplifier U7C connects
Connect, the electric capacity C33 of normal phase input end Jing the 33rd ground connection of the 3rd operational amplifier U7C, the 3rd operational amplifier
The in-phase input end of U7C is also connected with the negative pole signal output end of the pressure sensor (33), and the 3rd computing is put
The resistance R26 of output end Jing the 26th of big device U7C is connected with the inverting input of the 3rd operational amplifier U7C, described
The inverting input of output end Jing the 29th the resistance R29 and four-operational amplifier U7D of the 3rd operational amplifier U7C connects
Connect, inverting input also the resistance R25 of Jing the 25th, the 22nd resistance R22 and first of the four-operational amplifier U7D
The output end connection of operational amplifier U7A, in-phase input end and the pressure sensor of the four-operational amplifier U7D
(33) positive pole signal output end connection, the in-phase input end also Jing the 31st of the four-operational amplifier U7D is electric
Hold C31 to be connected with the in-phase input end of the 3rd operational amplifier U7C, the homophase input of the four-operational amplifier U7D
The end also electric capacity C34 of Jing the 34th ground connection, the resistance R30 of output end Jing the 30th of the four-operational amplifier U7D with it is described
The inverting input connection of four-operational amplifier U7D, the output end also Jing the 31st of the four-operational amplifier U7D is electric
Resistance R31, the 32nd electric capacity C32 ground connection, output end also Jing the 31st resistance R31, AD of the four-operational amplifier U7D
Change-over circuit is connected with pressure detecting controller.
7. a kind of agriculture according to claim 3 fills metering control, it is characterised in that on the communicating circuit plate (36)
Communicating circuit is provided with, the communicating circuit is 485 communicating circuits, and the communicating circuit includes 485 conversion chip U1, described
The resistance R7 of first pin Jing the 7th, the 5th resistance R5 ground connection of 485 conversion chip U1, the second of the 485 conversion chip U1 draws
Pin is connected with the 3rd pin of the 485 conversion chip U1, the second pin also resistance of Jing the 15th of the 485 conversion chip U1
R15 is connected with pressure detecting controller, and the second pin also resistance R6 of Jing the 6th of the 485 conversion chip U1 connect power supply, described
The second pin of 485 conversion chip U1 is also connected with the colelctor electrode of the 3rd triode Q3, the emitter stage of the 3rd triode Q3
Ground connection, the resistance R9 of base stage Jing the 9th of the 3rd triode Q3 is connected with the 4th pin of the 485 conversion chip U1, described
The 5th pin ground connection of 485 conversion chip U1, the 8th pin of the 485 conversion chip U1 connects power supply, 485 conversion chip
8th pin of U1 also the second electric capacity of Jing C2 be grounded, the resistance R10 of the 6th pin Jing the tenth of the 485 conversion chip U1 with it is described
The 7th pin connection of 485 conversion chip U1, the 6th pin also resistance R8 of Jing the 8th of the 485 conversion chip U1 connect power supply,
6th pin of the 485 conversion chip U1 is connected with one end of two-way transient supression diode Z1, the two-way transient supression
The other end of diode Z1 is connected with the 7th pin of the 485 conversion chip U1, the 6th pin of the 485 conversion chip U1
It is connected with the negative electrode of the second Zener diode Z2, the plus earth of the second Zener diode Z2, the 485 conversion chip U1
The resistance R11 of the 7th pin Jing the 11st ground connection, the 7th pin of the 485 conversion chip U1 and the 3rd Zener diode Z3's
Negative electrode connects, the plus earth of the 3rd Zener diode Z3, the 6th pin, the 7th pin of the 485 conversion chip U1
As the lead of the communicating circuit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106194688A (en) * | 2016-08-23 | 2016-12-07 | 重庆市伟岸测器制造股份有限公司 | Agriculture fills metering control system and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106194688A (en) * | 2016-08-23 | 2016-12-07 | 重庆市伟岸测器制造股份有限公司 | Agriculture fills metering control system and control method thereof |
| CN106194688B (en) * | 2016-08-23 | 2017-11-21 | 重庆市伟岸测器制造股份有限公司 | Agriculture fills metering control system and its control method |
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