CN114518259B - Multiple sampling device for water quality detection - Google Patents
Multiple sampling device for water quality detection Download PDFInfo
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- CN114518259B CN114518259B CN202210074423.2A CN202210074423A CN114518259B CN 114518259 B CN114518259 B CN 114518259B CN 202210074423 A CN202210074423 A CN 202210074423A CN 114518259 B CN114518259 B CN 114518259B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
- F16L55/115—Caps
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
- G01N2001/1418—Depression, aspiration
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- 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
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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- General Engineering & Computer Science (AREA)
- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Physics & Mathematics (AREA)
- Hydrology & Water Resources (AREA)
- Mechanical Engineering (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to the technical field of water quality detection, and particularly relates to a multiple sampling device for water quality detection, which comprises a box body, wherein glass bottles are fixedly arranged in an inner cavity of the box body, the number of the glass bottles is four, the four groups of the glass bottles are fixedly connected side by side, and the outer wall of the glass bottle positioned at the outer side is fixedly connected with the side wall of the inner cavity of the box body. The negative pressure pump can generate negative pressure in the glass bottle, so that water can be introduced into the glass bottle, a plurality of glass bottles are arranged at the same time, and single sampling can be carried out separately, so that the condition that water source doping affects the later detection precision is effectively avoided, multiple sampling is realized, the condition that the detection effect is not affected due to repeated sampling is avoided, and meanwhile, the plurality of glass bottles are arranged in the inner cavity of the box body, so that the device can be effectively protected, and the device has the advantages of compact integral structure, small volume and convenience in carrying and storage.
Description
Technical Field
The invention relates to the technical field of water quality detection, in particular to a multiple sampling device for water quality detection.
Background
The purpose of water quality inspection is to examine the environmental quality, to examine whether the water quality is convenient or suitable, to examine the pollution or the degree of pollution of the water, to examine the efficiency of the water treatment process, etc. The test items (which may be referred to as water quality parameters) of the water sample depend on the purpose of the test and the nature of the water sample. The data obtained should be comprehensively evaluated to account for water quality.
The current water quality testing is preceding needs to sample the water source to need use sampling device, current sampling device structure is more single, when some needs multiple spot sample, need repetitious usage sampling device, but can remain the water in a water source place in the sampling device after the single use, thereby can mix in another group of water sample when taking a sample again, thereby can lead to influencing the precision of last detection, simultaneously current sampling device does not possess sealed effect after using, thereby the dust gets into easily, influence later stage result of use easily. For this reason, new solutions need to be designed to solve.
Disclosure of Invention
The invention aims to provide a multiple sampling device for water quality detection, which solves the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the multiple sampling device for water quality detection comprises a box body, wherein glass bottles are fixedly arranged in an inner cavity of the box body, the number of the glass bottles is four, the four groups of glass bottles are fixedly connected side by side, and the outer wall of the glass bottle positioned at the outer side is fixedly connected with the side wall of the inner cavity of the box body;
the bottom of the glass bottle is fixedly communicated with a first short pipe, the outer wall of the first short pipe is fixedly provided with a first electromagnetic valve, the tail end of the first short pipe is fixedly communicated with a hose, the tail end of the hose penetrates through the box body and is fixedly communicated with a second short pipe, the bottom of the inner cavity of the box body is fixedly provided with an electric push rod close to the hose, the tail end of the electric push rod penetrates through the box body and is fixedly connected with a cross rod, the outer end of the cross rod is fixedly provided with a fixed block, the left side wall of the fixed block is embedded with a motor, the outer end of a transmission shaft of the motor is fixedly connected with the outer wall of the second short pipe, and the inner wall of the glass bottle is fixedly provided with a liquid level sensor;
the top of the box body is fixedly provided with a negative pressure pump, the outer end of the negative pressure pump penetrates through the top of the box body through a pipeline and is fixedly communicated with a four-way pipe, the tail ends of the four-way pipe are respectively communicated with the tops of four groups of glass bottles, the four tail ends of the four-way pipe are fixedly provided with second electromagnetic valves, and the outer wall of the box body is fixedly provided with a controller;
the signal output end of the liquid level sensor is connected with the signal input end of the controller, and the signal output end of the controller is respectively connected with the signal input ends of the negative pressure pump, the electric push rod, the first electromagnetic valve and the second electromagnetic valve.
As a preferable implementation mode of the invention, a groove is formed in the bottom of the box body at the rear side of the second short pipe, and a rubber pad is fixedly arranged in an inner cavity of the groove.
As a preferred implementation mode of the invention, the left side of the top of the glass bottle is fixedly communicated with an air inlet pipe, and the outer wall of the air inlet pipe is fixedly provided with a third electromagnetic valve.
As a preferred embodiment of the invention, the outer wall of the four-way pipe is fixedly communicated with a cleaning pipe, the outer end of the cleaning pipe penetrates through the box body and is fixedly communicated with a connector, and the outer wall of the cleaning pipe is fixedly provided with a fourth electromagnetic valve.
As a preferred embodiment of the invention, a discharging pipe is fixedly communicated with the lower side of the back of the glass bottle, the discharging pipe penetrates through the box body and extends to the outer side of the box body, and a fifth electromagnetic valve is fixedly arranged on the outer wall of the discharging pipe.
As a preferred embodiment of the present invention, a through hole is formed at the bottom of the case corresponding to the hose, and the inner diameter of the through hole is larger than the outer diameter of the hose.
As a preferable implementation mode of the invention, a handle is fixed at the top of the box body, and a rubber sleeve for skid resistance is fixedly sleeved on the outer wall of the handle.
As a preferred implementation mode of the invention, the corners of the outer wall of the box body are fixedly sleeved with the matched sponge sleeves.
As a preferable implementation mode of the invention, the box body is of a double-layer structure, and the heating wire is arranged in the clamping cavity of the box body.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, negative pressure can be generated in the glass bottle through the negative pressure pump, so that water can be introduced into the glass bottle, and a plurality of glass bottles are arranged at the same time and can be separately sampled, so that the condition that water source doping influences the later detection precision is effectively avoided, multiple sampling is realized, the condition that the detection effect is not influenced by repeated sampling is avoided, and meanwhile, the plurality of glass bottles are arranged in the inner cavity of the box body, so that the device can be effectively protected, and the device has the advantages of compact integral structure, small volume and convenience in carrying and storage.
2. According to the invention, the second short pipe can be driven to extend through the electric push rod, so that sampling can be performed at different positions, meanwhile, the motor is utilized to drive the second short pipe to rotate, and then the electric push rod is retracted, so that the second short pipe is inserted into the groove and sealed through the rubber pad in the groove, thus dust invasion can be effectively avoided, and further, the influence caused by dust can be avoided when the electric push rod is reused.
3. The cleaning pipe is arranged, so that the cleaning pipe is conveniently connected with an external cleaning liquid pipeline, cleaning liquid is conveniently introduced to clean the glass bottle, high-temperature drying is matched, residual water stains are avoided, the cleanliness of the glass bottle in the next use process can be guaranteed, and the accuracy of detection after sampling is further guaranteed.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic cross-sectional view of a multiple sampling device for water quality testing according to the present invention;
FIG. 2 is a schematic diagram showing the connection structure of a cross rod and a second short pipe of the multiple sampling device for water quality detection;
FIG. 3 is a schematic diagram of the bottom structure of a case of a multiple sampling device for water quality testing according to the present invention;
FIG. 4 is a schematic view showing the structure of the back surface of a glass bottle of a multiple sampling device for water quality testing according to the present invention.
In the figure: 1. a case; 2. a glass bottle; 3. a first short tube; 4. a hose; 5. a second short tube; 6. an electric push rod; 7. a cross bar; 8. a first electromagnetic valve; 9. a four-way pipe; 10. a negative pressure pump; 11. a second electromagnetic valve; 12. an air inlet pipe; 13. a third electromagnetic valve; 14. a controller; 15. a handle; 16. a rubber sleeve; 17. cleaning the tube; 18. a fourth electromagnetic valve; 19. a fixed block; 20. a motor; 21. a liquid level sensor; 22. a groove; 23. a rubber pad; 24. a discharge pipe; 25. and a fifth electromagnetic valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, or detachably connected, disposed, or integrally connected, disposed, for example. It will be understood by those skilled in the art that the specific meaning of the terms in the present invention is specifically understood by those skilled in the art, and that the types of electric appliances provided in the present invention are only references, and that different types of electric appliances having the same function may be replaced according to actual use conditions.
Referring to fig. 1-4, the present invention provides a technical solution: the multiple sampling device for water quality detection comprises a box body 1, wherein glass bottles 2 are fixedly arranged in an inner cavity of the box body 1, the number of the glass bottles 2 is four, the four groups of the glass bottles 2 are fixedly connected side by side, and the outer wall of the glass bottle 2 positioned at the outer side is fixedly connected with the side wall of the inner cavity of the box body 1;
the bottom of the glass bottle 2 is fixedly communicated with a first short tube 3, the outer wall of the first short tube 3 is fixedly provided with a first electromagnetic valve 8, the tail end of the first short tube 3 is fixedly communicated with a hose 4, the tail end of the hose 4 penetrates through the box body 1 and is fixedly communicated with a second short tube 5, the bottom of the inner cavity of the box body 1, close to the hose 4, is fixedly provided with an electric push rod 6, the tail end of the electric push rod 6 penetrates through the box body 1 and is fixedly connected with a cross rod 7, the outer end of the cross rod 7 is fixedly provided with a fixed block 19, the left side wall of the fixed block 19 is embedded with a motor 20, the outer end of a transmission shaft of the motor 20 is fixedly connected with the outer wall of the second short tube 5, and the inner wall of the glass bottle 2 is fixedly provided with a liquid level sensor 21;
specifically, the liquid level sensor 21 can detect the water level inside the glass bottles 2, so that quantitative sampling is realized, meanwhile, multiple sampling can be realized through the arrangement of the glass bottles 2, and independent sampling of the glass bottles 2 is not influenced, so that the influence on the detection effect caused by water resource doping is avoided;
the top of the box body 1 is fixedly provided with a negative pressure pump 10, the outer end of the negative pressure pump 10 penetrates through the top of the box body 1 through a pipeline and is fixedly communicated with a four-way pipe 9, the tail ends of the four-way pipe 9 are respectively communicated with the tops of four groups of glass bottles 2, the four tail ends of the four-way pipe 9 are respectively fixedly provided with a second electromagnetic valve 11, the outer wall of the box body 1 is fixedly provided with a controller 14, and the negative pressure pump 10 can generate negative pressure, so that water can be introduced into the glass bottles 2 to realize sampling;
the signal output end of the liquid level sensor 21 is connected with the signal input end of the controller 14, and the signal output end of the controller 14 is respectively connected with the signal input ends of the negative pressure pump 10, the electric push rod 6, the first electromagnetic valve 8 and the second electromagnetic valve 11;
the bottom of box 1 is located the rear side department of second nozzle stub 5 and has seted up recess 22, the inner chamber fixed mounting of recess 22 has rubber pad 23, the fixed intercommunication in top left side of glass bottle 2 has intake pipe 12, the outer wall fixed mounting of intake pipe 12 has third solenoid valve 13, the outer wall fixed intercommunication of four-way pipe 9 has cleaning tube 17, the outer end of cleaning tube 17 runs through box 1 and fixed intercommunication has the connector, the outer wall fixed mounting of cleaning tube 17 has fourth solenoid valve 18, the fixed intercommunication in back downside of glass bottle 2 has discharging pipe 24, discharging pipe 24 runs through box 1 and extends to the outside of box 1, the outer wall of discharging pipe 24 is fixed with fifth solenoid valve 25.
In the invention, when sampling is performed, firstly, one group of electric push rods 6 is started to drive the second short tube 5 to descend, so that the position is lower than that of the other groups of second short tubes 5, then the first electromagnetic valve 8 and the second electromagnetic valve 11 corresponding to the second short tube 5 are opened and reorganized, then the negative pressure pump 10 is started, so that negative pressure is generated, the second short tube 5 is inserted into a water source, so that water is introduced into the glass bottle 2 by utilizing the negative pressure, then the water is continuously introduced, when a certain water level is reached, a liquid level sensor 21 feeds back a signal to a controller 14, the controller 14 can close the negative pressure pump 10, meanwhile, the first electromagnetic valve 8 and the second electromagnetic valve 11 are closed, the controller 14 can start the corresponding electric push rods 6 to drive the second short tube 5 to reset, and then when sampling is performed again, the other groups of electric push rods 6 are started to drive the other groups of second short tubes 5 to descend and then repeated operation is performed, so that multiple sampling can be realized;
when water of a water sample is required to be led out, the third electromagnetic valve 13 is opened, and the fifth electromagnetic valve 25 is opened, so that the water in the corresponding glass bottle 2 can be led out through the discharging pipe 24, and discharging is realized;
when the device is not in use, the first electromagnetic valve 8 can be opened, the cleaning pipe 17 is communicated with an external cleaning liquid pipeline, and then the cleaning liquid enters the glass bottle 2 for flushing, so that the cleaning function can be achieved, after the cleaning, the cleaning device is not required to be used, the electric push rod 6 drives the second short pipe 5 to descend, the motor 20 drives the second short pipe 5 to overturn, the electric push rod 6 drives the overturned second short pipe 5 to ascend and be inserted into the groove 22, sealing is achieved at the bottom of the rubber pad 23, and the influence of dust entering the second short pipe 5 on later sampling is avoided.
In an alternative embodiment, a through hole is formed at the bottom of the box 1 corresponding to the hose 4, and the inner diameter of the through hole is larger than the outer diameter of the hose 4.
The flexible tube 4 is effectively ensured to be flexible.
In an alternative embodiment, a handle 15 is fixed on the top of the box 1, and a rubber sleeve 16 for skid resistance is fixedly sleeved on the outer wall of the handle 15.
The handle 15 is provided to facilitate the user's hand-held operation, and the rubber sleeve 16 is provided to improve the hand feeling and prevent slipping.
In an alternative embodiment, the corners of the outer wall of the box body 1 are fixedly sleeved with matched sponge sleeves.
It should be noted that the sponge sleeve can be protected from tip hazards.
In an alternative embodiment, the case 1 has a double-layer structure, and the heating wire is disposed in the clamping cavity of the case 1.
The heating wire is provided so that the glass bottle 2 can be heated and dried after being cleaned.
In addition, the components included in the multiple sampling device for water quality detection are all universal standard components or components known to those skilled in the art, the structure and principle of the multiple sampling device are all known by the skilled person through technical manuals or known by conventional experimental methods, all the electric devices are connected through wires at the idle position of the device, the electric devices refer to power elements, the electric devices and an adaptive monitoring computer and a power supply, and the specific connection means refers to the following working principles, namely the electric connection is completed through the working sequence among the electric devices, and the detailed connection means is known in the art, and the following main description of the working principles and processes are not used for explaining the electric control.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (9)
1. The utility model provides a water quality testing is with multiple sampling device, includes box (1), its characterized in that: the inner cavity of the box body (1) is fixedly provided with glass bottles (2), the number of the glass bottles (2) is four, the four groups of glass bottles (2) are fixedly connected side by side, and the outer wall of the glass bottle (2) positioned at the outer side is fixedly connected with the side wall of the inner cavity of the box body (1);
the bottom of glass bottle (2) is fixed to be linked together and is had first nozzle stub (3), the outer wall of first nozzle stub (3) is fixed with first solenoid valve (8), the tail end fixed intercommunication of first nozzle stub (3) has hose (4), the tail end of hose (4) runs through box (1) and is fixed to be linked together and have second nozzle stub (5), the inner chamber bottom of box (1) is close to hose (4) department and is fixed with electric putter (6), the tail end of electric putter (6) runs through box (1) and fixedly connected with horizontal pole (7), the outer end of horizontal pole (7) is fixed with fixed block (19), the left side wall of fixed block (19) is inlayed and is equipped with motor (20), the transmission shaft outer end of motor (20) and the outer wall fixed connection of second nozzle stub (5), the inner wall of glass bottle (2) is fixed with liquid level sensor (21);
the top of the box body (1) is fixedly provided with a negative pressure pump (10), the outer end of the negative pressure pump (10) penetrates through the top of the box body (1) through a pipeline and is fixedly communicated with a four-way pipe (9), the tail ends of the four-way pipe (9) are respectively communicated with the tops of four groups of glass bottles (2), the four tail ends of the four-way pipe (9) are fixedly provided with second electromagnetic valves (11), and the outer wall of the box body (1) is fixedly provided with a controller (14);
the signal output end of the liquid level sensor (21) is connected with the signal input end of the controller (14), and the signal output end of the controller (14) is respectively connected with the signal input ends of the negative pressure pump (10), the electric push rod (6), the first electromagnetic valve (8) and the second electromagnetic valve (11);
starting one group of electric push rods 6 to drive the second short pipe 5 to descend, then opening a first electromagnetic valve 8 and a second electromagnetic valve 11 corresponding to the group of second short pipes 5, starting a negative pressure pump 10, inserting the second short pipe 5 into a water source, introducing water into the glass bottle 2 by using negative pressure, continuously introducing water, feeding back a signal to a controller 14 by a liquid level sensor 21 when a certain water level is reached, closing the negative pressure pump 10 by the controller 14, closing the first electromagnetic valve 8 and the second electromagnetic valve 11 at the same time, starting the corresponding electric push rods 6 by the controller 14 to drive the second short pipe 5 to reset, and then starting the other group of electric push rods 6 to drive the other group of second short pipes 5 to descend and repeating operation when sampling is carried out again;
when the device is not in use, the first electromagnetic valve 8 can be opened, the cleaning pipe 17 is communicated with an external cleaning liquid pipeline, and then the cleaning liquid enters the glass bottle 2 for flushing, so that the cleaning function can be achieved, after the cleaning, the cleaning device is not required to be used, the electric push rod 6 drives the second short pipe 5 to descend, the motor 20 drives the second short pipe 5 to overturn, the electric push rod 6 drives the overturned second short pipe 5 to ascend and be inserted into the groove 22, sealing is achieved at the bottom of the rubber pad 23, and the influence of dust entering the second short pipe 5 on later sampling is avoided.
2. The multiple sampling device for water quality testing according to claim 1, wherein: the bottom of the box body (1) is provided with a groove (22) at the rear side of the second short pipe (5), and a rubber pad (23) is fixedly arranged in the inner cavity of the groove (22).
3. The multiple sampling device for water quality testing according to claim 1, wherein: an air inlet pipe (12) is fixedly communicated with the left side of the top of the glass bottle (2), and a third electromagnetic valve (13) is fixedly arranged on the outer wall of the air inlet pipe (12).
4. The multiple sampling device for water quality testing according to claim 1, wherein: the outer wall of the four-way pipe (9) is fixedly communicated with a cleaning pipe (17), the outer end of the cleaning pipe (17) penetrates through the box body (1) and is fixedly communicated with a connector, and a fourth electromagnetic valve (18) is fixedly arranged on the outer wall of the cleaning pipe (17).
5. The multiple sampling device for water quality testing according to claim 1, wherein: the discharging pipe (24) is fixedly communicated with the lower side of the back of the glass bottle (2), the discharging pipe (24) penetrates through the box body (1) and extends to the outer side of the box body (1), and a fifth electromagnetic valve (25) is fixed on the outer wall of the discharging pipe (24).
6. The multiple sampling device for water quality testing according to claim 1, wherein: the bottom of the box body (1) is provided with a through hole corresponding to the hose (4), and the inner diameter of the through hole is larger than the outer diameter of the hose (4).
7. The multiple sampling device for water quality testing according to claim 1, wherein: the top of the box body (1) is fixed with a handle (15), and the outer wall of the handle (15) is fixedly sleeved with a rubber sleeve (16) for preventing slipping.
8. The multiple sampling device for water quality testing according to claim 1, wherein: the outer wall corners of the box body (1) are fixedly sleeved with an adaptive sponge sleeve.
9. The multiple sampling device for water quality testing according to claim 1, wherein: the box body (1) is of a double-layer structure, and an electric heating wire is arranged in a clamping cavity of the box body (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210074423.2A CN114518259B (en) | 2022-01-21 | 2022-01-21 | Multiple sampling device for water quality detection |
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| CN202210074423.2A CN114518259B (en) | 2022-01-21 | 2022-01-21 | Multiple sampling device for water quality detection |
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| CN114518259B true CN114518259B (en) | 2023-09-05 |
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