CN106770483A - Measurement apparatus - Google Patents
Measurement apparatus Download PDFInfo
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- CN106770483A CN106770483A CN201611243172.7A CN201611243172A CN106770483A CN 106770483 A CN106770483 A CN 106770483A CN 201611243172 A CN201611243172 A CN 201611243172A CN 106770483 A CN106770483 A CN 106770483A
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- screen banks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/043—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a granular material
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- General Health & Medical Sciences (AREA)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention provides a kind of measurement apparatus, it is related to the technical field of measuring instrument, including collector, measuring appliance and controller；Water inlet and delivery port are provided with the collector；Water pump is provided between the water inlet and delivery port；The controller controls the water in the suction collector by controlling the water pump；The water inlet is provided with the first screen banks, and the silt that first screen banks is used in filter water, the water after filtering is flowed out by the delivery port；The measuring appliance measures the quantity of sand and mud being detained on first screen banks, and communicates information to the controller.The measurement apparatus that the present invention is provided have quick accurately advantage；The METHOD FOR CONTINUOUS DETERMINATION of time discrete can be realized with the real time measure sediment charge simultaneously.
Description
Technical field
The present invention relates to the technical field of measuring instrument, more particularly, to a kind of measurement apparatus.
Background technology
Measurement sediment charge has many kinds, can finally be attributed to two major classes：Direct measuring method and Indirect Determination.
Direct measuring method is by the water in sampling, filtering silt, drying, by measure sediment charge of weighing.Survey indirectly
The method of determining is some characteristics by silt come the method for determining silt content, including atomic nucleus method and other assay methods, is surveyed indirectly
The method of determining can METHOD FOR CONTINUOUS DETERMINATION, mainly have capacitance method, vibratory drilling method, photoelectric method, supercritical ultrasonics technology and laser method etc..
The subject matter that the above method is present：Direct measuring method sampling, remove water, weigh, labour intensity is high, waste time and energy.
Indirect Determination measurement is easily disturbed, and measurement result is unstable, causes error larger, and such as photoelectric method measurement silt scope is narrower；
Capacitance method, vibratory drilling method temperature influence are larger, thus its less stable.
The content of the invention
It is an object of the invention to provide a kind of measurement apparatus, directly surveyed when measure in the prior art sediment charge alleviating
Determine that method labour intensity is high, waste time and energy, can not pinpoint, continuously measuring；When Indirect Determination is measured, easily it is disturbed, measurement result
The larger technical problem of unstable, error.
The measurement apparatus that the present invention is provided include collector, measuring appliance and controller；It is provided with the collector into water
Mouth and delivery port；Water pump is provided between the water inlet and delivery port；The controller is controlled by controlling the water pump
Water in the system suction collector；The water inlet is provided with the first screen banks, and first screen banks is used in filter water
Silt, the water after filtering flows out through the water pump by the delivery port；The measuring appliance measures first screen banks
The quantity of sand and mud of upper delay, and communicate information to the controller.
Further, the measuring appliance is electric resistance sensor, and the electric resistance sensor and power supply are connected.
Further, first screen banks includes multiple sieve plates；Along direction from the water inlet to the water pump, the sieve
The aperture of the sieve aperture on plate is sequentially reduced.
Further, the quantity of the collector is multiple.
Further, the opening direction of the water inlet of multiple collectors is different.
Further, the water outlet of the collector is provided with the second screen banks；It is provided with the water pump turnover
Water-holding portion, makes the water be sucked from the delivery port, from water inlet outflow.
Further, the water outlet of the collector is provided with the second screen banks, and second screen banks and measuring appliance are connected；
Two water-holding portion are provided with the water pump, two water-holding portion are respectively facing the water inlet and delivery port.
Further, the measurement apparatus include housing, and the cross section of the housing is circle；The water inlet and water outlet
Mouth is arranged on multiple orientation of the surface of shell.
Further, lid is provided with the outside of the water inlet and delivery port, the lid and controller are connected.
Further, the measurement apparatus also include pressure sensor, underwater for measuring the measurement apparatus
Depth.
The measurement apparatus that the present invention is provided include collector, measuring appliance and controller；Be provided with collector water inlet and
Delivery port；Water pump is provided between water inlet and delivery port, water pump is used to absorb water；Controller is controlled by controlling water pump
Water in sucking collector；Water inlet is provided with the first screen banks, and first screen banks is used to filter silt, the water after filtering
Flowed out by delivery port through water pump；Measuring appliance measures the quantity of sand and mud being detained on first screen banks, and communicates information to described
Controller.The measurement apparatus that the present invention is provided, actively extract the water containing silt, and lead to by the water pump in collector in water
Cross the silt of delay on the first screen banks to measure quantity of sand and mud, and then obtain the silt contained in water outlet.Compared to straight in the prior art
Connect the content that determination method measures silt, the present invention provide with quick accurate advantage；The measurement dress that the present invention is provided simultaneously
Put, the ectocines such as temperature, the water flow velocity of the water to be measured are not received during measurement, therefore, the measurement apparatus that the present invention is provided are difficult
It is disturbed, measurement result is relatively stablized, measurement error is smaller.
Brief description of the drawings
In order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art, below will be to specific
The accompanying drawing to be used needed for implementation method or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
The schematic diagram of the measurement apparatus that Fig. 1 is provided for the present invention；
The schematic diagram of multiple collectors is provided with the measurement apparatus that Fig. 2 is provided for the present invention；
The schematic diagram of the sieve plate of the measurement apparatus that Fig. 3 is provided for the present invention；
The stereogram of the measurement apparatus that Fig. 4 is provided for the present invention.
Icon：10- housings；20- collectors；30- controllers；The screen banks of 21- first；The screen banks of 22- second；23- enters
The mouth of a river；24- delivery ports；25- water pumps；211- sieve plates；40- electric resistance sensors；50- pressure sensors；212- sieve apertures；
60- power supplys.
Specific embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", D score, "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outward " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify describe, rather than indicate imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that indicating or implying relative importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected；Can
Being to mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
Two connections of element internal.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
The measurement apparatus that the present invention is provided include collector 20, measuring appliance and controller 30, as shown in Figure 1.Collector 20
For collecting the water containing silt.The measuring appliance amount for measuring silt.Water inlet 23 and delivery port 24 are provided with collector 20.
Water containing silt is entered into collector 20 by water inlet 23, and is flowed out by delivery port 24.Water inlet 23 and delivery port 24 it
Between be provided with water pump 25.Controller 30 controls the amount of water in sucking collector 20 by controlling water pump 25.Water inlet 23
Place is provided with the first screen banks 21, and the first screen banks 21 is used to filter silt, and the water after filtering is flowed out by delivery port 24.Measuring appliance is measured
Go out the quantity of sand and mud being detained on the first screen banks 21, and communicate information to controller 30.The measurement apparatus that the present invention is provided, by receiving
Water pump 25 in storage 20 actively extracts the water containing silt in water, and measures the volume of the water of absorption.Water pump 25 will contain
The water of silt is drawn into collector 20 by water inlet 23, and by the first screen banks 21, the filtering of the first screen banks 21 contains the water of silt, this
When sediment retention on the first screen banks 21.The water inlet 23 of the now control of controller 30 collector 20 is closed, and is no longer intake.Water leads to
Cross water pump 25 and flow out collector 20 from water outlet, now the opening of delivery port 24 is closed.Now, measured according to water pump 25 and enter into receipts
The water of storage 20,.Measuring appliance measures the quantity of sand and mud being detained on the first screen banks 21, you can the silt that obtains containing in water sample contains
Amount.Controller 30 can be outside the water surface, and the data that water pump 25 and measuring appliance are measured can be transferred directly on controller 30.
Specifically, above-mentioned measuring appliance can be electric resistance sensor 40, and electric resistance sensor 40 and power supply 60 are connected, with the first sieve
Group 21 forms a circuit.Because the quantity of sand and mud being detained on the first screen banks 21 is different, and there is certain quantitative relation, when the first sieve
When having electric current to pass through in group 21, the resistivity of the first screen banks 21 for measuring is different.When the non-water flow of the first screen banks 21 passes through, silt is stagnant
Stay on the first screen banks 21, the resistivity of the first screen banks 21 is now determined with electric resistance sensor 40, can obtain being trapped in first
Quantity of sand and mud on screen banks 21.Therefore containing for silt can be speculated by the resistivity of the first screen banks 21 of measure of electric resistance sensor 40
Amount.Water containing silt is entered into collector 20 by water inlet 23, by after the first screen banks 21, sediment retention is in the first screen banks
On 21, water pump 25 can discharge water from delivery port 24.Now, water inlet 23 is closed, and water pump 25 continues to suck in water, until will
Water is discharged from delivery port 24.Now there is electric current to pass through on the first screen banks 21, by determining the resistivity on the first screen banks 21
Obtain the amount of silt being trapped on the first screen banks 21.
First screen banks 21 can be comprising multiple sieve plates 211, and the size of sieve aperture 212 of sieve plate 211 can be with inconsistent.Such as Fig. 3 institutes
Show, the larger sieve plate 211 of sieve aperture 212 can be arranged at the opening of collector 20；The less sieve plate 211 of sieve aperture 212 can set
Put in the inner side of collector 20.When the water containing silt is entered into collector 20 by water inlet 23, sieve aperture 212 is first passed through larger
Sieve plate 211, then by the less sieve plate 211 of sieve aperture 212, be now relatively large in diameter in silt and be trapped in the larger sieve of sieve aperture 212
On plate 211, it is trapped in the smaller silt of diameter on the less sieve plate 211 of sieve aperture 212.By after the first screen banks 21, entering into receipts
Water sand content in storage 20 is less.Such setting, can be such that silt as much as possible stays on the first screen banks 21, make measurement
Result is more accurate.Above-mentioned each sieve plate 211 can be connected with electric resistance sensor 40 respectively, it is also possible to share an electric resistance sensor
40.The resistivity of sieve plate 211 is measured by electric resistance sensor 40, and then obtains quantity of sand and mud.
Further, the quantity of above-mentioned collector 20 can be multiple, as shown in Figure 4.During measurement, can simultaneously obtain many
The data of individual quantity of sand and mud, water.After collection, the data of collection are analyzed, finally rational data are averaged.Such setting
The data of collection can be made more accurate.
Further, the opening direction of the water inlet 23 of multiple collectors 20 is different.Such setting can be in multiple side
Collection water sample determines the content containing silt in water upwards, with avoid that The turbulent river crashes its way through or certain collection water sample at have vortex, its water
The data of the collection caused by the direction of flowing is inaccurate it is inaccurate the occurrence of.
Above-mentioned collector 20 can be sampling pipe, and one end of sampling pipe can be water inlet 23, and the other end can be water outlet
Mouth 24, the middle setting water pump 25 of sampling pipe.
The second screen banks 22 can be provided with the delivery port 24 of collector 20, the second screen banks 22 connects with electric resistance sensor 40
Connect.Turnover water-holding portion is provided with water pump 25, water is sucked from delivery port 24, flowed out from water inlet 23.By water pump 25
Suction, the water containing silt can be made to be entered by water inlet 23, by the water-holding portion of water pump 25, flowed out by delivery port 24；When
When measuring again, the water-holding portion upset of water pump 25 makes the water containing silt be entered by delivery port 24, by the second screen banks
22, on above-mentioned second screen banks 22, the water for now entering passes through the water-holding portion of water pump 25 to the most of sediment retention contained in water,
Flowed out from the water inlet 23 of collector 20.Now, the current of quick flowing can be flushed in the silt being detained on the first screen banks 21,
And take away in the silt being detained on the first screen banks 21.Water inlet 23 is now closed, collector 20 is not entered back into water；Wait to collect
When water in device 20 is drained, delivery port 24 is closed.The now measurable silt on the second screen banks 22.Water-holding portion on water pump 25
After overturning again, the water containing silt enters from the water inlet 23 of collector 20, and the water for now entering the first screen banks 21 passes through water
After the water-holding portion of pump 25, by the second screen banks 22, the current for now having certain flow rate can be to the second screen banks 22 of last time measurement
Silt washed away.By above-mentioned setting, it is possible to achieve the continuous measurement of measurement sediment charge.
It should be noted that similar with the first screen banks 21, the second screen banks 22 can include multiple sieve plates 211, sieve plate 211
The size of sieve aperture 212 can be with inconsistent.The larger sieve plate 211 of sieve aperture 212 can be arranged at the opening of delivery port 24；Sieve aperture 212
Less sieve plate 211 can be arranged on the inner side of collector 20.When the water containing silt enters into collector 20 by delivery port 24
In, the larger sieve plate 211 of sieve aperture 212 is first passed through, by the less sieve plate 211 of sieve aperture 212, the silt being now relatively large in diameter is stagnant
Stay on the larger sieve plate 211 of sieve aperture 212, the smaller sediment retention of diameter is on the less sieve plate 211 of sieve aperture 212.By second
After screen banks 22, the water sand content entered into collector 20 is less.Such setting, can make silt as much as possible stay in
On two screen banks 22, make measurement result more accurate.Above-mentioned each sieve plate 211 can be connected with electric resistance sensor 40 respectively, it is also possible to
Sieve plate 211 is connected on an electric resistance sensor 40.The resistivity of sieve plate 211 is measured by electric resistance sensor 40, and then
Obtain quantity of sand and mud.
Alternately, two water-holding portion can also be provided with water pump 25, two water-holding portion are respectively facing the He of water inlet 23
Delivery port 24, and two water-holding portion communicate.Water can enter from water inlet 23, by the first screen banks 21, by after water-holding portion,
By the second screen banks 22, flowed out from delivery port 24；Water can also enter from delivery port 24, by the second screen banks 22, by water suction
Behind portion, by the first screen banks 21, flowed out from water inlet 23.
Measurement apparatus can include housing 10, and the cross section of housing 10 can be circle；Multiple above-mentioned collectors 20 enter
The mouth of a river 23 and delivery port 24 are arranged on multiple orientation on the surface of housing 10.When measurement apparatus are measured in current, due to
The turbulent river crashes its way through or has vortex, and the section of housing 10 is that circular setting can allow current along the surface of housing 10, compared to shell
The setting of the rectangular cross-section of body 10, can alleviate impact of the current to housing 10.
Further, the shape of housing 10 can be sphere shape, as shown in figure 4, when housing 10 declines in water, it is such
Setting can alleviate impact of the current to housing 10.Meanwhile, housing 10 is the setting of spheroid, compared to square, its identical table
Area lower volume is larger, and more collector 20 can be set in housing 10.It is simultaneously cost-effective.Now, multiple collectors
20 water inlet 23 and delivery port 24 can be arranged on the different azimuth of housing 10, collector 20 is gathered in multiple orientation and contain
There is the water of silt.The data for measuring can average, and be vortexed or rapid such that it is able to excluding or alleviating to be in water housing 10
The inaccurate problem of data measured is flowed to increase the accuracy of measurement.
Housing 10 can also include upper shell and lower house, and upper shell and lower house are detachably connected to facilitate housing 10
Internal gathering device 20, pressure sensor 50, the replacing of electric resistance sensor 40.Can set close between upper shell and lower house simultaneously
Encapsulating structure, such as sealing ring ensure not intake inside housing 10.
Measurement apparatus also include power supply 60, and pressure sensor 50 and electric resistance sensor 40 are connected with power supply 60.Power supply 60 can
Think the battery that the inside of housing 10 is set, it is also possible to be arranged on the outside of housing 10, pressure sensor 50 and electric resistance sensor 40
It is connected with power supply 60 by insulated conductor.
The outside of water inlet 23 and delivery port 24 can be provided with lid, and lid and controller 30 connect to control lid
Open and close.Before electric resistance sensor 40 first screen banks 21 is measured, controller 30 controls the lid of water inlet 23, makes water
Do not enter from water inlet 23, until the water in collector 20 is drained only, controller 30 controls the lid of delivery port 24, make water not from
Delivery port 24 enters.When water enters from delivery port 24, and when measuring sediment charge, the lid that can first close on delivery port 24.
Measurement apparatus can also include pressure sensor 50, for measuring the underwater depth of the measurement apparatus.Pressure
Force snesor 50 can be arranged in housing 10, and is connected with controller 30.
In sum, the measurement apparatus that the present invention is provided can include housing 10, controller 30, power supply 60.In housing 10
It is provided with collector 20, pressure sensor 50, electric resistance sensor 40.Pressure sensor 50 is used to measure depth of the housing 10 in water
Degree.The two ends of collector 20 can be provided with water inlet 23 and delivery port 24, can be set between water inlet 23 and delivery port 24
There is water pump 25.The first screen banks 21 can be provided between water inlet 23 and water pump 25, can be set between delivery port 24 and water pump 25
It is equipped with the second screen banks 22.Water containing silt is drawn into collector 20 by water pump 25, specifically, by water inlet 23 by the
One screen banks 21 is entered into collector 20, and sediment retention is on the first screen banks 21.The lid closed at water inlet 23, water pump 25 will
After water is discharged from delivery port 24, the lid closed at delivery port 24.Now measured by measurement first by electric resistance sensor 40
Resistivity on screen banks 21 measures silt of the silt on the first screen banks 21.When controller 30 is by the unlatching for controlling water pump 25
Between and flow velocity come control enter measuring appliance water.Last electric resistance sensor 40 is by quantity of sand and mud, the opening time of water pump 25 and stream
The information transmission of speed obtains the content of silt in water by the data on controller 30 to controller 30.During measurement, contain mud
Husky water can also enter from delivery port 24, and water pump 25 is entered by the second screen banks 22, through the first screen banks 21 from water inlet 23
Outflow.Now, the silt being detained on the first screen banks 21 is taken away by the water of certain flow rate and measure next time facilitating.Using this hair
The measurement apparatus of bright offer, can set multiple collectors 20 in different azimuth, take multiple measurements, and will can finally measure
Data average, to reach the purpose of accurate measurement.Above-mentioned housing 10 could be arranged to spheroid, can reduce housing 10 and exist
Resistance in water, is convenient for measuring.Using the measurement apparatus that the present invention is provided, the active in water by the water pump 25 in collector 20
The water containing silt is extracted, and the silt contained in water is measured by the silt being detained on the first screen banks 21, the second screen banks 22
Amount.Compared to direct measurement in the prior art, the convenient and simple purpose of measurement can be reached, at the same can different location,
Continuous measurement.Meanwhile, the measurement apparatus that the present invention is provided, compared to the device that Indirect Determination in the prior art measures silt,
Disturbing for the extraneous circumstances such as temperature, the current received is difficult, continuous measurement can be carried out repeatedly, while multi-group data is gathered, therefore,
The data for measuring are more accurate, and error is smaller.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (10)
1. a kind of measurement apparatus, it is characterised in that the measurement apparatus include collector, measuring appliance and controller；
Water inlet and delivery port are provided with the collector；Water pump is provided between the water inlet and delivery port；The control
Device processed controls the water in the suction collector by controlling the water pump；
The water inlet is provided with the first screen banks, the silt that first screen banks is used in filter water, the water after filtering
Flowed out by the delivery port through the water pump；The measuring appliance measures the quantity of sand and mud being detained on first screen banks, and will letter
Breath sends the controller to.
2. measurement apparatus according to claim 1, it is characterised in that the measuring appliance is electric resistance sensor, the resistance
Sensor and power supply are connected.
3. measurement apparatus according to claim 1, it is characterised in that first screen banks includes multiple sieve plates；Along described
Direction from water inlet to the water pump, the aperture of the sieve aperture on the sieve plate is sequentially reduced.
4. measurement apparatus according to claim 1, it is characterised in that the quantity of the collector is multiple.
5. measurement apparatus according to claim 4, it is characterised in that the opening of the water inlet of multiple collectors
Direction is different.
6. measurement apparatus according to claim 1, it is characterised in that the water outlet of the collector is provided with
Two screen banks, second screen banks and measuring appliance are connected；Turnover water-holding portion is provided with the water pump, makes the water from described
Delivery port is sucked, from water inlet outflow.
7. measurement apparatus according to claim 1, it is characterised in that the water outlet of the collector is provided with
Two screen banks；Two water-holding portion are provided with the water pump, two water-holding portion are respectively facing the water inlet and delivery port.
8. measurement apparatus according to claim 1, it is characterised in that the measurement apparatus include housing, the housing
Cross section is circle；The water inlet and delivery port are arranged on multiple orientation of the surface of shell.
9. measurement apparatus according to claim 1, it is characterised in that lid is provided with the outside of the water inlet and delivery port
Son, the lid and controller are connected.
10. measurement apparatus according to claim 1-9 any one, it is characterised in that the measurement apparatus are also included
Pressure sensor, for measuring the underwater depth of the measurement apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611243172.7A CN106770483B (en) | 2016-12-29 | 2016-12-29 | Measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611243172.7A CN106770483B (en) | 2016-12-29 | 2016-12-29 | Measuring device |
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| CN106770483A true CN106770483A (en) | 2017-05-31 |
| CN106770483B CN106770483B (en) | 2023-10-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328913A (en) * | 2017-07-26 | 2017-11-07 | 中国农业大学烟台研究院 | A kind of suitable silt ratio judgment means of latent bottom class aquatic livestock |
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| CN104215787A (en) * | 2014-10-09 | 2014-12-17 | 广西大学 | Automatic measuring and data recording device for silt content in river water |
| CN104407227A (en) * | 2014-11-05 | 2015-03-11 | 贝兹维仪器(苏州)有限公司 | Power grid pole mud resistivity measurement system |
| CN204347142U (en) * | 2014-11-05 | 2015-05-20 | 贝兹维仪器(苏州)有限公司 | A kind of electrical network pole mud resistivity measuring system |
| CN205175854U (en) * | 2015-12-16 | 2016-04-20 | 钟应林 | Automatic monitoring device of runoff and silt |
| CN106802132A (en) * | 2017-01-18 | 2017-06-06 | 青岛海洋地质研究所 | A kind of penetration type Multifunction fishing bottom sediment in-situ observation feeler lever |
| CN213516477U (en) * | 2020-10-12 | 2021-06-22 | 贵州益华高科技有限公司 | Water quality sampler |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328913A (en) * | 2017-07-26 | 2017-11-07 | 中国农业大学烟台研究院 | A kind of suitable silt ratio judgment means of latent bottom class aquatic livestock |
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