CN206472611U - A kind of frequency control Grading And Zoning constant irrigation automatic control system - Google Patents
A kind of frequency control Grading And Zoning constant irrigation automatic control system Download PDFInfo
- Publication number
- CN206472611U CN206472611U CN201720062447.0U CN201720062447U CN206472611U CN 206472611 U CN206472611 U CN 206472611U CN 201720062447 U CN201720062447 U CN 201720062447U CN 206472611 U CN206472611 U CN 206472611U
- Authority
- CN
- China
- Prior art keywords
- pressure
- irrigation
- control
- frequency
- constant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
Abstract
The utility model is related to a kind of frequency control Grading And Zoning constant irrigation automatic control system, and frequency conversion system includes：Ductwork pressure control point, distance-transmission pressure gauge, frequency converter, programmable controller, it is connected with frequency converter, control circuit, pressure conversion circuit for controlling pump rotary speed；The control time in program design switch being connected with programmable controller signal.The utility model is classified constant pressure water supply control system using frequency control, rotation flow group can carry out pressure rating switching automatically according to sewage farming block size and landform and according to irrigation subarea pressure control values set in advance, and irrigation system can be divided into several irrigation subareas, make planning and designing more flexible, realize that degree and zoning constant-pressure water feeding system is irrigated, and can guarantee that uniformity of irrigation water appilcation and quality requirement of pouring water, operational management is also more convenient.
Description
Technical field
The utility model belongs to water-saving irrigation technique field, more particularly to a kind of frequency control Grading And Zoning constant irrigation is certainly
Autocontrol system.
Background technology
At present, sprinkler and micro-irrigation (sprinkling irrigation and slight irrigation) is one of current water-saving irrigation project technology most widely used in the world,
Have the advantages that to economize on water, increase production, save land, strong adaptability, and towards low energy consumption, Precision Irrigation, Automated condtrol, multiple use
Develop Deng direction.Ended for the end of the year 2014 according to statistics, China's water-saving irrigation project gross area is 2901.9 ten thousand hm2, wherein sprinkler and micro-irrigation
Area is 784.4 ten thousand hm2, account for the 27% of total water-saving irrigation project area.Uniformity of irrigation water appilcation is measurement in sprinkler and micro-irrigation engineering design
One important parameter of quality of pouring water, has important influence to irrigated crop volume increase and water-saving result.Pressurizeed using electro-mechanical pump
Under the conditions of duct type sprinkler and micro-irrigation system, after pipe net arrangement and douche are determined, the pressure change of pipe network system is that influence is filled
The key factor of the water uniformity.But, pump motor is typically to make constant speed operating, the operation of water pump using power frequency supply (50Hz)
Characteristic does not adapt to the change of field network flow and pressure, when controlling irrigated area larger or topographical elevation difference is changed greatly,
There is certain limitation using traditional control and regulation measure such as compensator, pressure regulator valve, it is difficult to meet wanting for uniformity of irrigation water appilcation
Ask.Thus it is necessary to carry out the research that frequency control is classified constant irrigation automatic control system.
Variable-frequency control technique is the relation being directly proportional according to motor speed to working power incoming frequency, electronic by changing
Machine working power frequency reaches the purpose for changing motor speed, in electric machine speed regulation control aspect to be used widely.B
(2008) such as Hanson etc. (1996) and Charles have carried out adjusting pump motor rotating speed to change output flow using frequency converter
With the research of pressure, Liu etc. (2009) has carried out the research of PLC and frequency control constant pressure spriukler irrigation technology, and Lee waits (2015) to propose
A kind of design method of the slight irrigation frequency-changing control system based on PLC.But, it is larger or terrain slope is larger for irrigated area
Sprinkler and micro-irrigation system, can not meet the uniformity of irrigation water appilcation requirement of whole fields using a constant ductwork pressure, how basis
Irrigation subarea, which carries out classification constant irrigation, still must further study.
In summary, current irrigation control system can not be combined by variable-frequency control technique and automatic technology, no
Pressure rating switching can be carried out automatically according to irrigation subarea pressure control values set in advance, realize that degree and zoning constant pressure is supplied automatically
Water is irrigated, with the quality of pouring water for meeting uniformity of irrigation water appilcation requirement and improving sprinkler and micro-irrigation system.
The content of the invention
The utility model can not realize subregion point to solve current pipeline irrigation control system by variable-frequency control technique
Level constant irrigation, it is impossible to carry out pressure rating switching automatically according to irrigation subarea pressure control values set in advance, realize subregion
Be classified constant-pressure water feeding system irrigate, with meet uniformity of irrigation water appilcation requirement and improve sprinkler and micro-irrigation system pour water quality the problem of and carry
For a kind of frequency control Grading And Zoning constant irrigation automatic control system.
The utility model is adopted the technical scheme that to solve technical problem present in known technology：
A kind of frequency control Grading And Zoning constant irrigation automatic control system, frequency control Grading And Zoning constant irrigation
Automatic control system includes：
It is connected with distance-transmission pressure gauge, the ductwork pressure control point of the irrigation pressure information for obtaining Different Irrigation subregion；
It is connected with frequency converter signal, for detecting the pressure of pipe network pressure control point, and is converted into electric signal, feeds back to change
The distance-transmission pressure gauge of frequency device；
It is connected with programmable controller signal, the pressure signal for being fed back distance-transmission pressure gauge by the PID controller included
Compared with the setting pressure signal of irrigation subarea, it is adjusted after obtain frequency Setting signal, control the rotating speed and flow of water pump, it is real
During existing ductwork pressure control point pipe network changes in flow rate, the invariable frequency converter of the pressure at control point；
It is connected with frequency converter, the PID controller for receiving frequency converter controls the pressure bound of different pressures grade
Information, the programmable controller of automatic controlling water supplying irrigation is carried out according to the irrigation subarea of setting and pressure rating requirement；
It is connected with frequency converter, the control circuit for controlling pump rotary speed；
It is connected with programmable controller signal, it is automatic to carry out for the irrigation subarea according to setting and pressure rating requirement
The pressure conversion circuit of pressure rating switching；
The control time in program design switch being connected with programmable controller signal.
Further, the frequency control Grading And Zoning constant irrigation automatic control system also includes：With programmable controller
Signal is connected, while being connected with water pump, the solenoid valve system for controlling water-carrying capacity；The water pump is one or more；It is described
Solenoid valve system is provided with multiple magnetic valves of parallel connection.
Further, the frequency control Grading And Zoning constant irrigation automatic control system also includes：With programmable controller
Signal is connected, while being connected with control circuit, the manual/auto change-over circuit for adjusting the manual/auto running status of water pump.
Another object of the present utility model is to provide a kind of above-mentioned frequency control Grading And Zoning constant irrigation of utilization certainly
The fruit tree drip irrigation control system of autocontrol system.
Another object of the present utility model is to provide a kind of above-mentioned frequency control Grading And Zoning constant irrigation of utilization certainly
The wheat paddock spray irrigation control system of autocontrol system.
The utility model has the advantages and positive effects of：In traditional sprinkler and micro-irrigation engineering, general rotation flow group be according to
The size of water pump metered flow is divided, when irrigated area is larger or topographical elevation difference is changed greatly, it is difficult to which it is equal to meet irrigation
The requirement of evenness.The utility model is classified constant pressure water supply control system using frequency control, and rotation flow group can be big according to field is irrigated
Small and landform simultaneously carries out pressure rating switching, and will can irrigate automatically according to irrigation subarea pressure control values set in advance
System is divided into several irrigation subareas, makes planning and designing more flexible, realizes that degree and zoning constant-pressure water feeding system is irrigated, and energy
Ensure uniformity of irrigation water appilcation and quality requirement of pouring water, operational management is also more convenient.
Brief description of the drawings
Fig. 1 is the frequency control classification constant irrigation automatic control system schematic diagram that the utility model embodiment is provided；
In figure：1st, ductwork pressure control point；2nd, distance-transmission pressure gauge；3rd, frequency converter；4th, programmable controller；5th, electricity is controlled
Road；6th, pressure conversion circuit；7th, control time in program design is switched；8th, magnetic valve；9th, manual/auto change-over circuit；10th, water pump.
The relation curve of flow Q and lift H when Fig. 2 is the pump variable frequency speed governing operation of the utility model embodiment offer
Figure.
Embodiment
For invention, features and effects of the present utility model can be further appreciated that, following examples are hereby enumerated, and coordinate
Accompanying drawing describes in detail as follows.
Structure of the present utility model is explained in detail with reference to figure.
As shown in figure 1, the frequency control Grading And Zoning constant irrigation automatic control system that the utility model embodiment is provided,
Including：
It is connected with distance-transmission pressure gauge, the ductwork pressure control point 1 of the irrigation pressure information for obtaining Different Irrigation subregion；
It is connected with frequency converter signal, for detecting the pressure of pipe network pressure control point, and is converted into electric signal, feeds back to change
The distance-transmission pressure gauge 2 of frequency device；
It is connected with programmable controller signal, the pressure signal for being fed back distance-transmission pressure gauge by the PID controller included
Compared with the setting pressure signal of irrigation subarea, it is adjusted after obtain frequency Setting signal, control the rotating speed and flow of water pump 10,
When realizing ductwork pressure control point pipe network changes in flow rate, the invariable frequency converter 3 of the pressure at control point；
It is connected with frequency converter, the PID controller for receiving frequency converter controls the pressure bound of different pressures grade
Information, the programmable controller 4 of automatic controlling water supplying irrigation is carried out according to the irrigation subarea of setting and pressure rating requirement；
It is connected with frequency converter, the control circuit 5 for controlling pump rotary speed；
It is connected with programmable controller signal, it is automatic to carry out for the irrigation subarea according to setting and pressure rating requirement
The pressure conversion circuit 6 of pressure rating switching；
The control time in program design switch 7 being connected with programmable controller signal.
Further, the frequency control Grading And Zoning constant irrigation automatic control system also includes：With programmable controller
Signal is connected, while being connected with water pump, the solenoid valve system for controlling water-carrying capacity；The water pump is one or more；It is described
Solenoid valve system is provided with multiple magnetic valves 8 of parallel connection.
Further, the frequency control Grading And Zoning constant irrigation automatic control system also includes：With programmable controller
Signal is connected, while being connected with control circuit, the manual/auto change-over circuit for adjusting the manual/auto running status of water pump
9。
Structure of the present utility model is further described with reference to operation principle.
1st, frequency control Isobarically Control principle of the present utility model is：
Varying speed and constant pressure feed water is to adjust pump motor rotating speed to realize constant pressure water supply by frequency converter, its constant pressure control
Principle processed is determined by pump characteristics.
The graph of relation of flow Q and lift H when Fig. 2 is pump variable frequency speed governing operation, N1、N2... it is different rotating speeds n1、
n2... under flow Q and lift H characteristic curve.As shown in Figure 2, if in n1Under rotating speed, pass through the regulation measures such as control valve
By flow from Q1It is reduced to Q2, pressure will be along N1Curve is increased to B points by A points, it can be seen that improved while flow is reduced
Pressure (H2-H1).If pump rotary speed is adjusted using frequency converter, when rotating speed is by n1It is reduced to n2, flow is just from Q1It is reduced to Q2,
And pressure is invariable.This characteristic shows, within the specific limits, changes pump motor rotating speed to adjust using variable-frequency control technique
Water flow is saved, discharge pressure can be kept invariable, realize constant pressure water supply.If presetting different Stress controls etc.
Level, you can realize classification constant pressure water supply.
2 frequency controls are classified constant irrigation control system：
2.1 systems are constituted
Frequency control is classified constant irrigation automatic control system by frequency converter (including PID controller), programmable controller
(PLC), control time in program design switch, distance-transmission pressure gauge and related electric control unit composition, can be simultaneously to one or more three-phase
380V, 50Hz pump motor are automatically controlled, and are a kind of electromechanics one with frequency control and automatic DNA image cytometer function
Body smart machine.System design multistage pressure sets change-over circuit, can be set according to irrigation subarea (or irrigation method)
Pressure requirements carry out pressure rating switching automatically, realize that classification constant-pressure water feeding system is irrigated, it is ensured that the uniformity of irrigation, improve
Irrigation quality.
2.2 System Working Principle：
The operation principle of the system is, by distance-transmission pressure gauge detection pipe network control point pressure, and to be converted into electric signal, instead
Feed PID controller, PID controller compares pressure feedback signal with pressure Setting signal, it is adjusted after obtain frequency to
Determine signal, control the working frequency of frequency converter, so as to control the rotating speed and outflow of water pump, controlled when realizing pipe network changes in flow rate
The pressure of point is invariable.Meanwhile, the pressure bound control information of different pressures grade is supplied to PLC by PID controller, is led to
Crossing multistage pressure sets change-over circuit to carry out pressure rating automatically and cut, and is carried out according to the irrigation subarea of setting and pressure rating requirement
Automatic water-supply is irrigated.The operation principle of frequency control classification constant irrigation automatic control system is shown in Fig. 1.
2.3 systemic-function：
(1) system sets change-over circuit provided with multistage pressure, and irrigation subarea (or irrigation method) that can be as requested is certainly
It is dynamic to carry out pressure rating switching, and magnetic valve unlatching, closing are controlled, carry out degree and zoning constant pressure water supply irrigation；
(2) system is provided with manual/auto switching circuit, and when switching to automated location, system can be according to outlet pressure
Change, automatically adjusts the rotating speed of water pump, to maintain ductwork pressure constant.When frequency conversion control circuit breaks down, it can switch to
Manual position, makes water pump directly be run under power frequency, it is ensured that normal water supply；
(3) system can carry out automatic irrigation according to the irrigation program of setting；
(4) system controls water pump complete alternation soft start using PLC.There is malfunction coefficient and alarm simultaneously, and with scarce
The electic protection functions such as phase, short circuit, overload, momentary power failure protection.
The 2.4 system scope of applications：
(1) irrigated area is larger.When sprinkler and micro-irrigation control area is larger, using rotation flow working system, often each rotation flow group
It is required that the flow (rotation flow group area is different) that water pump is provided is different with pressure (resistance of ducting loss is different), it is necessary to using change frequency modulation
Speed classification constant irrigation automatic control system；
(2) topographical elevation difference changes greatly.When the topographical elevation difference of sprinkler and micro-irrigation control area is changed greatly, each douche requires water
The pressure that pump is provided is different, should allow pressure luffing according to design, divide irrigation subarea.Each irrigation subarea requires what water pump was provided
Flow (irrigated area is different) is different with pressure (landform altitude is different), it is necessary to be controlled automatically using frequency control classification constant irrigation
System processed；
(3) a tractor serves several purposes.For the irrigated area at same water source, when using different irrigation methods, such as one water source
Well controlling zone domain, fruit tree uses drip irrigation, and wheat paddock is using sprinkling irrigation, it is desirable to the flow that water pump is provided it is different with pressure, it is necessary to using
Frequency control is classified constant irrigation automatic control system.
The determination of 3 system level pressure ratings：
When determining sprinkler and micro-irrigation system level pressure rating, first have to determine that development of system allows pressure luffing, passing
Unite on the basis of sprinkler and micro-irrigation design method, irrigation system is divided into several irrigation subareas, it is desirable to each irrigation subarea
The working head difference of interior any two douche must allow in pressure luffing in system design, that is, meet following formula requirement
Wherein：himaxFor the i-th irrigation subarea douche maximum functional head, m；himinIt is minimum for the i-th irrigation subarea douche
Working head, m；hdFor douche design work head, m.
After irrigation subarea is determined, it is thus necessary to determine that the pressure control point of pipe network system.In sprinkler and micro-irrigation engineering design, in order to manage
Convenient, general ductwork pressure control point is selected at pipe network head pivot, when irrigated area is larger, can also clicked Stress control
In each irrigation subarea pipe network porch.Design head and flow with douche is arranged according to pipe network system, according to formula (2)
(3) pressure rating value of each irrigation subarea in pressure control point can just be calculated.
Hi=hd+hik+Zi (2)
Wherein：HiIt is the i-th irrigation subarea in the pressure rating value of pressure control point, m；hikWhen being worked for the i-th irrigation subarea
Least favorable douche is to the loss of flood peak at ductwork pressure control point, m；ZiFor the i-th irrigation subarea least favorable douche and pressure control
Make the discrepancy in elevation of point, m；K is the sampling factor of consideration local head loss, K >=1；fjFor the coefficient of friction resistance of jth pipeline section；LjFor jth
The length of pipeline section, m；QijThe flow of jth pipeline section, m when being worked for the i-th irrigation subarea3/s；DjJth when being worked for the i-th irrigation subarea
The caliber of pipeline section, m；M is the index of discharge；.
In traditional sprinkler and micro-irrigation engineering, general rotation flow group is divided according to the size of water pump metered flow, works as irrigation
When area is larger or topographical elevation difference is changed greatly, it is difficult to meet the requirement of irrigation uniformity.Supplied using frequency control classification constant pressure
Water control system, rotation flow group can be divided according to sewage farming block size and landform, and if can be divided into irrigation system
A dry irrigation subarea, makes planning and designing more flexible, and can guarantee that uniformity of irrigation water appilcation and quality requirement of pouring water, and operational management is also more
It is convenient.
Described above is only, to preferred embodiment of the present utility model, not to make any formal to the utility model
Limitation, it is every according to technical spirit of the present utility model to any simple modification made for any of the above embodiments, equivalent variations with
Modification, is belonged in the range of technical solutions of the utility model.
Claims (3)
1. a kind of frequency control Grading And Zoning constant irrigation automatic control system, it is characterised in that the frequency control classification point
Area's constant irrigation automatic control system includes：
It is connected with distance-transmission pressure gauge, the ductwork pressure control point of the irrigation pressure information for obtaining Different Irrigation subregion；
It is connected with frequency converter signal, for detecting the pressure of pipe network pressure control point, and is converted into electric signal, feeds back to frequency converter
Distance-transmission pressure gauge；
It is connected with programmable controller signal, the pressure signal for being fed back distance-transmission pressure gauge by the PID controller included and filling
Subregion setting pressure signal is irrigate to compare, it is adjusted after obtain frequency Setting signal, control the rotating speed and flow of water pump, realize pipe
During net pressure control point pipe network changes in flow rate, the invariable frequency converter of the pressure at control point；
It is connected with frequency converter, pressure bound control information of the PID controller by different pressures grade for receiving frequency converter,
The programmable controller of automatic controlling water supplying irrigation is carried out according to the irrigation subarea of setting and pressure rating requirement；
It is connected with frequency converter, the control circuit for controlling pump rotary speed；
It is connected with programmable controller signal, for the irrigation subarea according to setting and pressure rating requirement, pressure is carried out automatically
The pressure conversion circuit of grade switching；
The control time in program design switch being connected with programmable controller signal, for realizing manual/auto/shut-off function, and is carried out
Switching；Automatic function can realize that each subregion is irrigated according to setting pressure rating.
2. frequency control Grading And Zoning constant irrigation automatic control system as claimed in claim 1, it is characterised in that the change
Frequency modulation speed Grading And Zoning constant irrigation automatic control system also includes：It is connected with programmable controller signal, while connecting with water pump
Connect, the solenoid valve system for controlling pipe network water-carrying capacity；The water pump is one or more；The solenoid valve system is provided with simultaneously
Multiple magnetic valves of connection.
3. frequency control Grading And Zoning constant irrigation automatic control system as claimed in claim 1, it is characterised in that the change
Frequency modulation speed Grading And Zoning constant irrigation automatic control system also includes：It is connected with programmable controller signal, while electric with control
Road is connected, the manual/auto change-over circuit for adjusting the manual/auto running status of water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720062447.0U CN206472611U (en) | 2017-01-17 | 2017-01-17 | A kind of frequency control Grading And Zoning constant irrigation automatic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720062447.0U CN206472611U (en) | 2017-01-17 | 2017-01-17 | A kind of frequency control Grading And Zoning constant irrigation automatic control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206472611U true CN206472611U (en) | 2017-09-08 |
Family
ID=59755325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720062447.0U Expired - Fee Related CN206472611U (en) | 2017-01-17 | 2017-01-17 | A kind of frequency control Grading And Zoning constant irrigation automatic control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206472611U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110226492A (en) * | 2019-06-13 | 2019-09-13 | 国电南瑞科技股份有限公司 | A kind of electric irrigation and drainage system constant irrigation device and method of agricultural |
| CN110999768A (en) * | 2019-12-24 | 2020-04-14 | 贵州航天智慧农业有限公司 | Automatic partitioning constant-pressure method for field rotation irrigation frequency converter |
| CN111685016A (en) * | 2020-06-22 | 2020-09-22 | 扆亮海 | Sprinkling irrigation graded water pumping frequency conversion energy-saving method for mountain slope tea garden |
| CN112166978A (en) * | 2020-09-30 | 2021-01-05 | 山东农业大学 | Double-width subarea supplementary irrigation high-yield water-saving planting method for wheat |
| CN112868513A (en) * | 2021-01-22 | 2021-06-01 | 高建新 | Water-saving irrigation automatic control system and water pressure control method thereof |
-
2017
- 2017-01-17 CN CN201720062447.0U patent/CN206472611U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110226492A (en) * | 2019-06-13 | 2019-09-13 | 国电南瑞科技股份有限公司 | A kind of electric irrigation and drainage system constant irrigation device and method of agricultural |
| CN110999768A (en) * | 2019-12-24 | 2020-04-14 | 贵州航天智慧农业有限公司 | Automatic partitioning constant-pressure method for field rotation irrigation frequency converter |
| CN111685016A (en) * | 2020-06-22 | 2020-09-22 | 扆亮海 | Sprinkling irrigation graded water pumping frequency conversion energy-saving method for mountain slope tea garden |
| CN111685016B (en) * | 2020-06-22 | 2022-06-07 | 扆亮海 | Sprinkling irrigation graded water pumping frequency conversion energy-saving method for mountain slope tea garden |
| CN112166978A (en) * | 2020-09-30 | 2021-01-05 | 山东农业大学 | Double-width subarea supplementary irrigation high-yield water-saving planting method for wheat |
| CN112166978B (en) * | 2020-09-30 | 2022-08-12 | 山东农业大学 | Double-width subarea supplementary irrigation high-yield water-saving planting method for wheat |
| CN112868513A (en) * | 2021-01-22 | 2021-06-01 | 高建新 | Water-saving irrigation automatic control system and water pressure control method thereof |
| CN112868513B (en) * | 2021-01-22 | 2023-01-24 | 高建新 | Water-saving irrigation automatic control system and water pressure control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206472611U (en) | A kind of frequency control Grading And Zoning constant irrigation automatic control system | |
| CN105351271B (en) | proportional hydraulic control system | |
| CN103828690A (en) | Slightly-wetting irrigation water amount automatic control system | |
| CN106354168A (en) | Feedback control system of water supply pump station with in-series same pumps | |
| CN107372033A (en) | Constant current frequency conversion irrigation system | |
| CN104818747B (en) | Town and country are for water integrated ductwork pressure Optimized Operation intelligence control system and using method | |
| CN105757851A (en) | Chilled water flow-variable energy-saving control method and system | |
| CN103122648A (en) | Multi-way valve hydraulic control system, rectilinear walking control valve and excavator | |
| CN107288898A (en) | Constant current frequency conversion spray irrigation system | |
| CN103233494B (en) | A kind of energy-saving control system, excavator and method | |
| He et al. | Automatic water supply control system of graded constant pressure by variable frequency speed and its application to pipeline irrigation | |
| CN206385606U (en) | A kind of constant pressure water supply spray irrigation system based on PLC | |
| CN210232418U (en) | High-performance digital micro-lubricating external cooling atomization system | |
| CN204781126U (en) | Secondary pressurization station intelligence control system | |
| CN204929886U (en) | Quantitative control system in a kind of modern agriculture water-saving irrigation | |
| CN207869710U (en) | A kind of facility water-fertilizer integrated intelligent irrigation equipment | |
| CN203285409U (en) | Unattended polymer-injection station and injection-allocation station control system of oil field | |
| CN202787371U (en) | Intelligent control hydraulic system of excavator | |
| CN104514242A (en) | Constant-pressure water feeding device based on internet of things | |
| CN205655392U (en) | Regulation and controlling system is counted to water pump platform based on efficiency control | |
| CN212728038U (en) | Sprinkler liquid supply system with integrated functions of accumulated liquid supply and liquid manure | |
| CN205298775U (en) | Ware is opened and close to valve | |
| CN209196557U (en) | A kind of oil pipeline variable frequency pump combines regulator with regulating valve | |
| CN204626528U (en) | Water factory processed repumping house intelligent water supply system | |
| CN107588049A (en) | More arm support digital hydraulic systems and more arm support control methods |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170908 Termination date: 20180117 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |