CN108535058B - Sampling device and method - Google Patents

Abstract

The invention provides a sampling device, which comprises a floating body, a water taking pipe, a water pump assembly and a pretreatment device, wherein the floating body is used for floating in a water body; a flexible joint used for the floating body and/or the water intake pipe to freely swing in the water body when the water intake pipe is acted by external force so as to avoid the external force is arranged between the water intake pipe and the water pump assembly. The flexible joint enables the floating body and/or the water intake pipe to freely swing in the water body under the action of external force so as to avoid the external force, when the floating objects pass through, the floating body is stressed to dive along the situation, and floats out of the water surface after the floating objects are separated, so that a tumbler effect is formed, and the floating objects are not easy to gather; when the water level of the water body rises or falls, the inclination angles of the floating body and the water intake pipe can change along with the water level, so that the position (sampling depth) of the water intake from the water surface is relatively fixed, and a water sample can be normally taken.

Description

Sampling device and method

Technical Field

The invention relates to the technical field of water quality sampling, in particular to a sampling device and a sampling method.

Background

In recent years, environmental problems in China are becoming more severe, and environmental monitoring data are more and more emphasized by management departments. All levels of environment monitoring departments urgently need to monitor and research the water body environment in the jurisdictions, comprehensively master the water quality change conditions of water bodies such as lakes, reservoirs, riverways and the like, timely early warn and forecast pollution events, and provide scientific basis for decision making of management departments.

The floating objects are solid wastes floating on the surface of a water body depending on buoyancy, and comprise branches, straws, plastic products and the like. In reality, lakes, reservoirs and riverways contain a large amount of floaters, and when the sampling device is used for sampling in a water body containing the floaters, the floaters flow downstream and are easily gathered around the sampling device, so that the normal operation of the sampling device is influenced. The existence of floaters around the sampling device can cause adverse effect on the water quality of the water body, thereby influencing the representativeness of water sampling and the accurate and stable detection and analysis of the water sample by the water quality analyzer.

In addition, the existing sampling device cannot cope with the condition of large water level change of the water body. When the water level rises in the rich water period, the fixedly arranged sampling device can be submerged by water, so that the sampling device cannot be used or even is damaged; and when the water level is too low due to the water level reduction in the dry season, the situation that the sampling device cannot take water samples can occur.

Disclosure of Invention

The invention provides a sampling device and a method, which are used for solving the problems that floaters are gathered around the sampling device, so that the sampling device cannot normally operate and a water sample cannot be detected and analyzed.

The technical scheme adopted by the invention is as follows:

the invention provides a sampling device, which comprises a floating body, a water taking pipe, a water pump assembly and a pretreatment device, wherein the floating body is used for floating in a water body; a flexible joint used for the floating body and/or the water intake pipe to freely swing in the water body when the water intake pipe is acted by external force so as to avoid the external force is arranged between the water intake pipe and the water pump assembly.

Furthermore, the sampling device also comprises an adjusting mechanism for adjusting the hovering position of the water intake on the water intake pipe in the water body, wherein the adjusting mechanism comprises a guy cable which is fixedly connected to the floating body and/or the water intake pipe and is used for driving the water intake to float upwards or submerge downwards; the pull rope ring is arranged on the water pump assembly and used for penetrating the pull rope to enable the force application direction of the pull rope to be reversed, and the free end of the pull rope is connected with a force application mechanism.

Further, the water pump assembly comprises a protective housing for forming an external protection; the submersible pump is packaged in the protective shell and used for providing conveying power for the collected water sample so as to convey the water sample to the pretreatment device; the sampling pipe is communicated to the output end of the flexible joint; and a sample outlet pipe communicated to the input end of the pretreatment device; the number of the submersible pumps is one; or a plurality of submersible pumps are arranged, and the plurality of submersible pumps are packaged in the same protective shell and are communicated with the sample inlet pipe and the sample outlet pipe; or the submersible pumps are arranged in a plurality of numbers, each submersible pump is respectively packaged in one protective shell, and the protective shells are connected into a whole.

Furthermore, the water pump assembly also comprises a backwashing sewage drain valve which is communicated with the protective shell in a closing way; the backwashing sewage drain valve and the protective shell are fixed into a whole and are arranged in a co-motion way.

Furthermore, an overhaul anchor point for overhauling the water pump assembly and/or a pipeline between the water pump assembly and the pretreatment device is arranged between the water pump assembly and the pretreatment device.

Further, the floating body is one of a floating rod, a floating ball, a floating block or a floating ring.

Furthermore, the water intake is positioned 0.1 m-3 m below the water surface.

Further, the pretreatment device comprises a sample inlet communicated with the output end of the water pump assembly; the probe water tank is communicated to the output end of the sample inlet and is used for carrying out preliminary detection on a water sample; the first water tank is communicated to the output end of the probe water tank and is used for sampling and detecting the water sample after rough filtration; the second water tank is communicated to the output end of the first water tank and is used for sampling and detecting the water sample after fine filtration; and a sample discharge port which is communicated with the output ends of the probe water tank, the first water tank and the second water tank respectively and is used for discharging the detected water sample; a coarse filter screen is arranged between the probe water tank and the first water tank, and a fine filter screen is arranged between the first water tank and the second water tank.

Furthermore, the coarse filter screen is an inclined filter screen with an inclination angle with the flow direction of the water sample of the sample inlet.

Further, the fine filter screen is a vertical filter screen, and the second water tank is provided with an ultrasonic vibrator facing the vertical filter screen.

The invention also provides a sampling method, which adopts the sampling device and comprises the following steps: a. placing the floating body in a water body to enable the water intake to be positioned below the liquid level; b. starting the water pump assembly, wherein a water sample enters the water pump assembly from the water intake and is pumped to the pretreatment device; c. roughly filtering a water sample by using an inclined filter screen, and sampling and detecting; d. and (3) finely filtering a water sample by using ultrasonic waves through a vertical filter screen, and sampling and detecting.

Further, when the water surface is frozen or sampling needs, the hovering position of the water intake in the water body is adjusted by the adjusting mechanism so as to facilitate sampling.

The invention has the following beneficial effects:

the sampling device provided by the invention comprises a floating body, a water taking pipe, a water pump assembly, a pretreatment device and a flexible joint. The body floats in the water for water intaking pipe and the intake on the water intaking pipe hover a certain position below the surface of water, are convenient for gather the water sample of this degree of depth. The water pump assembly can provide conveying power for the collected water sample and pump the water sample to the pretreatment device. The pretreatment device can filter impurities such as suspended matters in a water sample, so that the normal operation of subsequent water sample detection and analysis is ensured, and the pretreatment device can operate for a long time and stably under the outdoor condition without tap water. The flexible joint enables the floating body and/or the water intake pipe to freely swing in the water body under the action of external force so as to avoid the external force, when the floating objects pass through, the floating body is stressed to dive along the trend, and floats out of the water surface after the floating objects are separated, so that a tumbler effect is formed, and the floating objects are not easy to gather; when the water level of the water body rises or falls, the inclination angles of the floating body and the water intake pipe can change along with the water level, so that the position (sampling depth) of the water intake from the water surface is relatively fixed, and a water sample can be normally taken.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of a sampling device according to a preferred embodiment of the present invention;

FIG. 2 is a three-dimensional schematic view of a water pump assembly according to a preferred embodiment of the present invention;

FIG. 3 is an axial cross-sectional view of FIG. 2;

FIG. 4 is a schematic piping diagram of the pretreatment device in accordance with a preferred embodiment of the present invention;

fig. 5 is an operational schematic diagram of a pretreatment device in accordance with a preferred embodiment of the present invention.

Description of reference numerals:

1. a float; 2. a water intake pipe; 3. a water pump assembly; 4. a pretreatment device; 5. a water intake; 6. a protective housing; 7. a submersible pump; 8. a sample inlet pipe; 9. a sample outlet pipe; 10. backwashing the drain valve; 11. overhauling the anchor point; 12. a sample inlet; 13. a probe water tank; 14. a first water tank; 15. a second water tank; 16. a sample discharge port; 17. coarse filtration; 18. a fine filter screen; 19. an ultrasonic vibrator; 20. an overflow port.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

FIG. 1 is a schematic view of a sampling device according to a preferred embodiment of the present invention; FIG. 2 is a three-dimensional schematic view of a water pump assembly according to a preferred embodiment of the present invention; FIG. 3 is an axial cross-sectional view of FIG. 2; FIG. 4 is a schematic piping diagram of the pretreatment device in accordance with a preferred embodiment of the present invention; fig. 5 is an operational schematic diagram of a pretreatment device in accordance with a preferred embodiment of the present invention.

As shown in fig. 1, the sampling device of this embodiment includes a floatingbody 1 for floating in a water body, awater intake pipe 2 connected to the floatingbody 1 for collecting a water sample, awater pump assembly 3 communicated with an output end of thewater intake pipe 2 for providing power for the collected water sample, and a pretreatment device 4 communicated with an output end of thewater pump assembly 3 for pretreating the water sample. A flexible joint which is used for the floatingbody 1 and/or thewater intake pipe 2 to freely swing in the water body when thewater intake pipe 2 and thewater pump assembly 3 are acted by external force so as to avoid the external force is arranged between thewater intake pipe 2 and thewater pump assembly 3. The sampling device provided by the invention comprises a floatingbody 1, awater taking pipe 2, awater pump assembly 3, a pretreatment device 4 and a flexible joint. The floatingbody 1 floats in the water body, so that thewater intake pipe 2 and thewater intake 5 on thewater intake pipe 2 are suspended at a certain position below the water surface, and a water sample with the depth can be conveniently collected. Thewater pump assembly 3 can provide conveying power for the collected water sample and pump the water sample to the pretreatment device 4. The pretreatment device 4 can filter impurities such as suspended matters in a water sample, so that the normal operation of subsequent water sample detection and analysis is ensured, and the pretreatment device 4 can operate for a long time and stably under the outdoor condition without tap water. The flexible joint enables the floatingbody 1 and/or thewater intake pipe 2 to freely swing in the water body under the action of external force so as to avoid the external force, when the floating objects pass through, the floatingbody 1 is stressed to submerge along the trend, and floats out of the water surface after the floating objects are separated, so that a tumbler effect is formed, and the floating objects are not easy to gather; when the water level of the water body rises or falls, the inclination angles of the floatingbody 1 and thewater intake pipe 2 can change along with the water level, so that the position (sampling depth) of thewater intake 5 from the water surface is relatively fixed, and a water sample can be normally taken. Optionally, the flexible joint is a flexible pipe material such as a steel wire hose and a rubber hose.

As shown in fig. 1, in the present embodiment, the sampling device further includes an adjusting mechanism for adjusting the hovering position of thewater intake 5 on thewater intake pipe 2 in the water body. The adjusting mechanism comprises a guy cable which is fixedly connected on the floatingbody 1 and/or thewater intake pipe 2 and is used for driving thewater intake 5 to float upwards or submerge downwards; the pull rope ring is arranged on thewater pump assembly 3 and used for penetrating a pull rope to enable the force application direction of the pull rope to be reversed, and the free end of the pull rope is connected with a force application mechanism. Therefore, the floatingbody 1 and thewater intake pipe 2 float or submerge through the force application of the guy cable, and further thewater intake 5 on thewater intake pipe 2 is driven to float or submerge. The guy cable passes through the guy cable ring and is tightly tied to the shore, if the guy cable is tightly tied to themaintenance anchor point 11, the force application mechanism can be manual or mechanical, the force application mechanism increases or reduces the applied force and is reversed through the guy cable ring, so that the floatingbody 1 and/or thewater intake pipe 2 float or dive, and thewater intake 5 on thewater intake pipe 2 is driven to float or dive. When the water level of the water body changes, the hovering position of thewater intake 5 in the water body can be adjusted through the adjusting mechanism so as to take water samples conveniently. In the northern icing period, thewater intake 5 can be submerged below an ice layer through the adjusting mechanism, so that thewater intake 5 is prevented from freezing. When layered sampling is needed, thewater intake 5 can be adjusted to different depths by the adjusting mechanism to respectively perform sampling. Optionally, the adjusting mechanism is that a weight is additionally arranged on the floatingbody 1 and/or thewater intake pipe 2, the floatingbody 1 and/or thewater intake pipe 2 is submerged by utilizing the gravity of the weight, and the hovering position of thewater intake 5 of thewater intake pipe 2 in the water body is adjusted by controlling the weight of the weight. Optionally, the adjusting mechanism is an inflatable floatingbody 1, and the buoyancy is changed by controlling the inflation amount of the floatingbody 1, so that the hovering position of thewater intake 5 on thewater intake pipe 2 in the water body is adjusted. Alternatively, the adjusting mechanism adopts a hollow body, and the hovering position of thewater intake 5 is controlled by controlling the hollow body to suck or discharge water to change the weight of the hollow body so as to drive thewater intake pipe 2 to float upwards or submerge downwards. Alternatively, the tension cable loop may be reversed with a pulley.

As shown in fig. 2 and 3, in the present embodiment, thewater pump assembly 3 includes aprotective housing 6 for forming an external shield; the submersible pump 7 is packaged in theprotective shell 6 and used for providing conveying power for the collected water sample so as to convey the water sample to the pretreatment device 4; asample inlet pipe 8 communicated to the output end of the flexible joint; and a sample outlet pipe 9 communicated to the input end of the pretreatment device 4. The submersible pump 7 is provided with one pump; or a plurality of submersible pumps 7 are arranged, and the submersible pumps 7 are packaged in the sameprotective shell 6 and are communicated with thesample inlet pipe 8 and the sample outlet pipe 9; or the submersible pump 7 is provided with a plurality of submersible pumps 7, each submersible pump 7 is respectively packaged in oneprotective shell 6, and theprotective shells 6 are connected into a whole. Theprotection shell 6 can protect components such as the submersible pump 7 in thewater pump assembly 3 from being damaged by the outside, and can also provide a sealed environment to prevent external water from entering. The submersible pump 7 provides conveying power for the collected water sample, so that the water sample entering from thesample inlet pipe 8 is conveyed to the pretreatment device 4 through the sample outlet pipe 9. When a plurality of immersible pumps 7 can prevent that a certain immersible pump 7 from not working, other immersible pumps 7 normally work for wholewater pump assembly 3 can normal operating. And a plurality of immersible pumps 7 can provide more powerful transport power for the water sample can be carried to higher more distant position. The diversified combination of one or more immersible pumps 7 is convenient for satisfy different application scenes, can be according to the needs that the water sample was carried, adjusts immersible pump 7's the quantity that sets up. Each submersible pump 7 is matched with an independentprotective shell 6, so that the submersible pumps are convenient to mount, dismount and maintain, and the number of the submersible pumps 7 can be increased or decreased more conveniently. Alternatively, the number of activations of the submersible pump 7 may be selected as desired.

As shown in fig. 2 and 3, in the present embodiment, thewater pump assembly 3 further includes abackwashing sewage valve 10 disposed in closable communication with theprotective casing 6; thebackwashing sewage valve 10 and theprotective shell 6 are fixed into a whole and are arranged in a co-motion way. Reversely inputting cleaning fluid into thewater pump assembly 3 through the backwashingsewage discharge valve 10 for cleaning thewater pump assembly 3, so that impurities are reversely discharged out of thewater pump assembly 3 along with the cleaning fluid, and thewater pump assembly 3 is prevented from silting and blocking. When the cleaning liquid backflushs the sampling pipeline, pipeline impurities and silt are discharged out of thewater pump assembly 3 from the backflushing blow-downvalve 10 along with the cleaning liquid, so that the accumulation and blockage of the silt are avoided, and the backflushing blow-downvalve 10 is naturally closed during system sampling, so that the representativeness of water sampling is not influenced.

As shown in fig. 1, in the present embodiment, amaintenance anchor point 11 for maintaining thewater pump assembly 3 and/or a pipeline between thewater pump assembly 3 and the pretreatment device 4 is provided between thewater pump assembly 3 and the pretreatment device 4. Themaintenance anchor point 11 is convenient for carry out regular or unscheduled inspection and maintenance to the pipeline betweenwater pump assembly 3 and/orwater pump assembly 3 and preprocessing device 4, carries out timely maintenance towater pump assembly 3's trouble to and the corruption and the jam condition of inspection pipeline, carry out the maintenance of dredging pipe and damaged pipeline, keep and resume the normal operating of pipeline and equipment.

As shown in fig. 1, in the present embodiment, the floatingbody 1 may be of various suitable structures, such as: one of a floating rod, a floating ball, a floating block or a floating ring. The floatingbody 1 shown in fig. 1 is a floating rod, the floating rod is a hard pipe, the floating rod is slender, the cross section area is small, and floating objects are not easy to gather. The floating ball, the floating block and the floating ring have larger volumes and can provide larger buoyancy.

As shown in fig. 1, in the present embodiment, theintake port 5 is located 0.1 to 3m below the water surface. Due to stratification, the water quality of lakes, reservoirs, and rivers may be largely non-uniform in the depth direction due to the influence of water surface (water quality change caused by photosynthesis in the light transmission zone and water temperature change) and sediment (dissolution of substances in sediment). Furthermore, the method is simple. Settling of suspended matter may also cause non-uniformity in the water quality in the vertical direction. Thewater intake 5 is positioned at different depths below the water surface, so that layered sampling is facilitated, and the water quality change conditions of lakes, reservoirs, riverways and the like can be comprehensively mastered.

As shown in fig. 4 and 5, in the present embodiment, the pretreatment device 4 includes asample inlet 12 communicated with an output end of thewater pump assembly 3; aprobe water tank 13 communicated to the output end of thesample inlet 12 and used for carrying out preliminary detection on a water sample; afirst water tank 14 communicated to the output end of theprobe water tank 13 and used for sampling and detecting the water sample after rough filtration; asecond water tank 15 communicated to the output end of thefirst water tank 14 and used for sampling and detecting the water sample after fine filtration; and asample discharge port 16 communicated to the output ends of theprobe water tank 13, thefirst water tank 14 and thesecond water tank 15 respectively and used for discharging the detected water sample. Acoarse filter screen 17 is arranged between theprobe water tank 13 and thefirst water tank 14, and afine filter screen 18 is arranged between thefirst water tank 14 and thesecond water tank 15. The collected water sample is conveyed to thesample inlet 12 by thewater pump assembly 3, then the water sample enters theprobe water tank 13, and enters thefirst water tank 14 after being roughly filtered by therough filter 17, and the instrument performs sampling detection from thefirst water tank 14. A communicating pool is designed at the bottom of thefirst water tank 14 and the adjacentsecond water tank 15, afine filter screen 18 convenient to pull and take out is installed in the middle of the communicating pool, and due to the communicating effect, a water sample in thefirst water tank 14 enters thesecond water tank 15 after being finely filtered by thefine filter screen 18, and the instrument performs sampling detection in thesecond water tank 15. The water sample is regularly drained through thedrainage port 16, so that the blockage caused by excessive sediment in the water tank is avoided. Theprobe water tank 13 is provided with a probe integrated with five-parameter (pH, temperature, conductivity, turbidity and oxygen content) sensors, so that the five parameters of pH, temperature, conductivity, turbidity and oxygen content in the water sample can be directly measured, and the water sample can be conveniently and preliminarily known for subsequent treatment. Optionally,probe water tank 13,first water tank 14 and No. twowater tanks 15 still are equipped withoverflow mouth 20, and the water sample constantly gets into fromintroduction port 12, discharges fromoverflow mouth 20, guarantees that the water sample can obtain effectual renewal.

As shown in fig. 5, in this embodiment, thecoarse filter 17 is a slope filter having an inclination angle with respect to the flow direction of the sample at thesample inlet 12. When the inclined plane filter screen filters a water sample, impurities are not easy to attach to the surface of the inclined plane filter screen due to water flow scouring and gravity action, and a good self-cleaning effect is achieved. Optionally, the inclination angle is 30-60 degrees, and the proper inclination angle range enables the inclined plane filter screen to have stronger water flow scouring and gravity action when filtering a water sample, so that the self-cleaning effect is better. Preferably, the inclination angle is 45 °, 30 ° or 60 °. Optionally, thecoarse screen 17 is a horizontal screen, which uses gravity to remove impurities and prevent clogging. Optionally, thecoarse screen 17 is a vertical screen, and impurities are removed by using the water flow scouring effect to prevent blockage.

As shown in fig. 5, in this embodiment, thefine filter 18 is a vertical filter, and thesecond water tank 15 is provided with anultrasonic vibrator 19 facing the vertical filter. Theultrasonic vibrator 19 is installed just to the one side of vertical filter screen in the intercommunication pond of awater tank 14 and No. twowater tanks 15, and theultrasonic vibrator 19 that starts during the water sample fine filtration makes impurity drop, can prevent thatfine filter screen 18 from blockking up, startsultrasonic vibrator 19 and sends the ultrasonic wave and can also carry out reverse cleaning tofine filter screen 18 when 14 rows of samples of a water tank. Optionally, thefine screen 18 is spring loaded or otherwise mechanically vibrated to vibrate thefine screen 18 to facilitate the shedding of the impurities and prevent thefine screen 18 from clogging. Alternatively, thefine screen 18 may be a bevel screen.

As shown in fig. 1 and fig. 5, the sampling method of the present embodiment, which uses the above sampling apparatus, includes the following steps: a. placing the floatingbody 1 in a water body to enable thewater intake 5 to be positioned below the liquid level; b. starting thewater pump assembly 3, wherein a water sample enters thewater pump assembly 3 from thewater intake 5 and is pumped to the pretreatment device 4; c. roughly filtering a water sample by using an inclined filter screen, and sampling and detecting; d. and (3) finely filtering a water sample by using ultrasonic waves through a vertical filter screen, and sampling and detecting.

As shown in fig. 1 and 5, in the present embodiment, the floatingbody 1 is first placed in the water body, and thewater intake 5 is suspended below the water surface by the buoyancy of the floatingbody 1. When the floating objects pass by, the floatingbodies 1 are stressed to submerge along the trend, and float out of the water surface after the floating objects are separated, so that a tumbler effect is formed, and the floating objects are not easy to gather. When the system starts thewater pump assembly 3 for sampling, a water sample enters thewater pump assembly 3 from thewater intake 5 on thewater intake pipe 2 along thewater intake pipe 2 and is pumped to the pretreatment device 4 for pretreatment. The inclined filter screen is used for carrying out rough filtration on a water sample, filtering out larger impurities, and sampling by an instrument for detection and analysis; the vertical filter screen ultrasonic wave is strained carefully, filters out less impurity, and the instrument sample is detected and is analyzed.

As shown in fig. 1, in this embodiment, when the water level of the water body changes, the hovering position of thewater intake 5 in the water body can be adjusted by the adjusting mechanism, so as to take water samples. In the northern icing period, thewater intake 5 can be submerged below an ice layer through the adjusting mechanism, so that thewater intake 5 is prevented from freezing. When layered sampling is needed, thewater intake 5 can be adjusted to different depths by the adjusting mechanism to respectively perform sampling.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A sampling device is characterized in that a sampling device is provided,

the device comprises a floating body (1) floating in a water body, a water taking pipe (2) connected with the floating body (1) and used for collecting a water sample, a water pump assembly (3) communicated with the output end of the water taking pipe (2) and used for providing conveying power for the collected water sample, and a pretreatment device (4) communicated with the output end of the water pump assembly (3) and used for pretreating the water sample;

a flexible joint used for the floating body (1) and/or the water intake pipe (2) to freely swing in a water body under the action of external force so as to avoid the external force is arranged between the water intake pipe (2) and the water pump assembly (3);

the water pump assembly (3) sinks to the bottom of the water body to form a fixed point; the flexible joint is a flexible pipe, so that the floating body (1) and/or the water intake pipe (2) can freely swing in a water body under the action of an external force to avoid the external force, when a floater passes through, the floating body (1) is stressed to submerge along the trend, and floats out of the water surface after the floater is separated, so that a tumbler effect is formed, and the floater is not easy to gather.

2. The sampling device of claim 1,

the sampling device also comprises an adjusting mechanism for adjusting the hovering position of the water intake (5) on the water intake pipe (2) in the water body,

the adjusting mechanism comprises a guy cable which is fixedly connected to the floating body (1) and/or the water intake pipe (2) and is used for driving the water intake (5) to float upwards or submerge downwards; and the stay cable ring is arranged on the water pump assembly (3) and is used for penetrating the stay cable to enable the force application direction of the stay cable to be reversed.

3. The sampling device of claim 1,

the water pump assembly (3) comprises a protective shell (6) for forming external protection; the submersible pump (7) is packaged in the protective shell (6) and used for providing conveying power for the collected water sample so as to convey the water sample to the pretreatment device (4); a sample inlet pipe (8) communicated to the output end of the flexible joint; and a sample outlet pipe (9) communicated to the input end of the pretreatment device (4);

the submersible pumps (7) are arranged into one; or

The number of the submersible pumps (7) is multiple, and the submersible pumps (7) are packaged in the same protective shell (6) and are communicated with the sample inlet pipe (8) and the sample outlet pipe (9); or

The submersible pump (7) is arranged in a plurality of numbers, each submersible pump (7) is respectively packaged in one protective shell (6), and the protective shells (6) are connected into a whole.

4. The sampling device of claim 3,

the water pump assembly (3) also comprises a backwashing sewage drain valve (10) which can be communicated with the protective shell (6) in a closing way; the backwashing sewage valve (10) and the protection shell (6) are fixed into a whole and are arranged in a co-motion mode.

5. The sampling device of claim 1,

a water pump assembly (3) and a pre-treatment device (4) are arranged between the water pump assembly (3) and the pre-treatment device for selecting the water pump assembly (3) and/or the pre-treatment device

Or a maintenance anchor point (11) for maintaining the pipeline between the water pump assembly (3) and the pretreatment device (4).

6. The sampling device of claim 1,

the floating body (1) is one of a floating rod, a floating ball, a floating block or a floating ring.

7. The sampling device of any one of claims 1 to 6,

the pretreatment device (4) comprises a sample inlet (12) communicated with the output end of the water pump assembly (3); the probe water tank (13) is communicated to the output end of the sample inlet (12) and is used for carrying out preliminary detection on a water sample; a first water tank (14) communicated to the output end of the probe water tank (13) and used for sampling and detecting the water sample after rough filtration; a second water tank (15) communicated to the output end of the first water tank (14) and used for sampling and detecting the water sample after fine filtration; and a sample discharge port (16) which is communicated with the output ends of the probe water tank (13), the first water tank (14) and the second water tank (15) respectively and used for discharging the detected water sample;

probe water tank (13) with be equipped with coarse strainer (17) between a water tank (14), a water tank (14) with be equipped with fine screen (18) between No. two water tanks (15).

8. The sampling device of claim 7,

the coarse filter screen (17) is an inclined filter screen with an inclination angle in the water sample flow direction of the sample inlet (12).

9. The sampling device of claim 7,

the fine filter screen (18) is a vertical filter screen, and the second water tank (15) is provided with an ultrasonic vibrator (19) opposite to the vertical filter screen.

10. A sampling method using the sampling device according to any one of claims 1 to 9, comprising the steps of:

a. placing the floating body in a water body to enable the water intake to be positioned below the liquid level;

b. starting the water pump assembly, wherein a water sample enters the water pump assembly from the water intake and is pumped to the pretreatment device;

c. roughly filtering a water sample by using an inclined filter screen, and sampling and detecting;

d. and (3) finely filtering a water sample by using ultrasonic waves through a vertical filter screen, and sampling and detecting.

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