Water quality monitoring stratified sampling equipment and method

Abstract

The present invention provides a water quality monitoring layered sampling device and method, comprising a flying device that can float on a water body, a water sampling device installed at the lower end of the flying device, and a reeling device for controlling the vertical state of the water sampling device, wherein the water sampling device comprises a water sampling hose, a plurality of conduction control valve groups distributed at intervals are fixed on the surface of the water sampling hose, a counterweight device is installed at the bottom of the water sampling hose, and an extraction device connected to the water sampling hose is arranged at the top of the water sampling hose. The sampling device has a simple structure, low overall mass, and simple control. It is suitable for rapid sampling of reservoir areas that are difficult for staff to access, has high sampling efficiency, a stable sampling process, and accurate sampling results.

Description

Technical Field

[0001] The invention relates to the technical field of sampling devices, and in particular to stratified sampling equipment and methods for water quality monitoring. Background Art

[0002] By monitoring the water quality of water bodies, we can timely reflect the quality of the water environment, quickly analyze and judge the heavy metals, organic matter and other chemical substances in the water bodies, protect the living environment of aquatic organisms, and ensure the drinking water health of people in the reservoir area.

[0003] By controlling the drone to fly automatically to take samples of water bodies, the efficiency of water sampling has been greatly improved. It is especially suitable for sampling and monitoring water bodies in some difficult-to-reach uninhabited areas and mountainous areas. It can quickly reflect the water quality in the reservoir area and realize efficient monitoring of water quality.

[0004] In order to achieve multi-point sampling of different water layers and monitor the water quality of different water layers, a retractable water sampling device will be installed in the sampling equipment. Traditional water sampling devices are mostly retractable multi-layer casing structures. By controlling the extension length of the water sampling device, water sampling of the corresponding water layer can be achieved through different casings.

[0005] However, the traditional water sampling device has a large structure mass and is difficult to be stably and conveniently installed under the flying device, which affects the flight sampling radius of the overall equipment operation. In addition, the traditional casing telescopic structure has a complex internal structure. In the process of complex water environment or long-term continuous sampling, the failure rate is high, resulting in inaccurate or even failure of water sampling monitoring results. Summary of the invention

[0006] In response to the above problems, the present invention provides a stratified sampling device and method for water quality monitoring. The sampling device has a simple structure, low overall mass, and is easy to control. It is suitable for rapid sampling of reservoir areas that are difficult for staff to access. It has high sampling efficiency, a stable sampling process, and accurate sampling results.

[0007] To solve the above problems, the technical solution adopted by the present invention is:

[0008] The stratified sampling equipment for water quality monitoring comprises a flying device that can float on a water body, a water sampling device installed at the lower end of the flying device, and a reeling device for controlling the vertical state of the water sampling device, wherein the water sampling device comprises a water sampling hose, a plurality of conduction control valve groups distributed at intervals are fixed on the surface of the water sampling hose, a counterweight device is installed at the bottom of the water sampling hose, and an extraction device connected to the water sampling hose is arranged on the top of the water sampling hose; wherein the water sampling hose is arranged vertically in the water body by the reeling device and the counterweight device, and the conduction control valve groups are controlled in sequence from top to bottom to be in a first conduction state, so as to realize multi-point sampling of different water layers in the water body.

[0009] Preferably, the unwinding device comprises an unwinding control shaft rotatably connected to the flying device, and an unwinding control drum fixed to the outside of the unwinding control shaft, and the unwinding control drum is of hollow sealed design.

[0010] Preferably, a first connection portion connected to a counterweight device is provided at the bottom of the water sampling hose, and a second connection portion communicated with an extraction device is provided at the top of the water sampling hose.

[0011] Preferably, the extraction device includes an extraction component fixedly connected to the flying device, the extraction component is connected to an extraction hose, a rotating seal is installed at the axis of the unwinding control shaft, and the extraction hose and the second connection part are connected through the rotating seal to achieve continuous transportation of water.

[0012] Preferably, the extraction component includes a first docking joint inside, the first docking joint is connected to the extraction hose through a telescopic hose, a plurality of second docking joints are installed on the moving path of the first docking joint, and also includes a driving component for controlling the linear movement of the first docking joint and an electronic control device for controlling the action of the driving component.

[0013] Preferably, the conduction control valve group includes a conduction valve seat sealed and fixed in a water sampling hose, a first conduction opening is opened on the top of the conduction valve seat, a second conduction opening is opened on the side wall of the conduction valve seat, a conduction valve core is also sealed and rotatably connected in the conduction valve seat, and a three-way valve channel is opened inside the conduction valve core.

[0014] Preferably, a filtering device is detachably mounted on the outer side of the second conducting opening.

[0015] Preferably, the water sampling hoses are two arranged in parallel, both of the two water sampling hoses are connected to the extraction device, and an electromagnetic valve is installed at the connection point between the two water sampling hoses and the extraction device.

[0016] Preferably, the counterweight device includes a counterweight base, the inner wall of the counterweight base is rotatably connected to an adjustment roller, an adjustment rope is wrapped around the surface of the adjustment roller, the end of the adjustment rope is fixedly connected to the bottom of the water sampling hose, and the side wall of the counterweight base is also fixed with an adjustment element for controlling the rotation of the adjustment roller.

[0017] The stratified sampling method for water quality monitoring uses the above-mentioned stratified sampling equipment for water quality monitoring, and includes the following steps: S1, controlling the flying device to fly above a predetermined water body, and after reaching above the predetermined water body, controlling the flying device to descend, and controlling the flying device to float on the water body; S2, vertically arranging the water sampling hose in the water body through the unwinding device and the counterweight device; S3, sequentially controlling the conduction control valve group to be in the first conduction state to realize multi-point sampling of different water layers of the water body.

[0018] The beneficial effects of the present invention are:

[0019] Compared with the traditional multi-layer casing structure, the water sampling hose occupies a small volume and is made of soft and light material, which reduces the burden of continuous flight of the flying device and increases the flight radius of the flying device for sampling and monitoring; at the same time, by controlling the conduction of the control valve group in sequence, rapid sampling of water bodies at different levels can be achieved. The overall structure has a simple control method, is easy to use, reduces the failure rate, and ensures the accuracy and stability of water monitoring results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 It is a side structural schematic diagram of the present invention.

[0022] Figure 3 It is a schematic diagram of the main structure of the present invention.

[0023] Figure 4 For the present invention Figure 3 A in the figure is an enlarged structural diagram.

[0024] Figure 5 For the present invention Figure 3 The enlarged structural diagram at B in FIG.

[0025] Figure 6 It is a schematic diagram of the structure of the water sampling device of the present invention.

[0026] Figure 7 For the present invention Figure 6 The enlarged structural diagram at C in the figure.

[0027] Figure 8 It is a structural schematic diagram of the conduction valve core rotating to the second position in the present invention.

[0028] Fig. 9 This is a schematic diagram of the unwinding state of the adjustment rope of the present invention.

[0029] Fig.10 It is a schematic diagram of the unwinding state of the water sampling device of the present invention.

[0030] In the figure: 100, flying device; 110, flying platform; 120, spiral blade; 130, supporting device; 131, supporting frame; 132, first supporting plate; 133, second supporting plate; 200, unwinding device; 210, unwinding control roller; 220, unwinding control shaft; 300, extraction device; 310, extraction assembly; 311, electric control device; 312, driving assembly; 320, extraction hose; 330, rotating seal; 40 0. Counterweight device; 410. Counterweight base; 420. Adjustment roller; 430. Adjustment element; 440. Adjustment rope; 500. Water sampling device; 510. Second connection part; 520. Water sampling hose; 530. First connection part; 600. Conductive control valve group; 610. Conductive valve seat; 611. First conductive opening; 612. Second conductive opening; 620. Filter device; 630. Conductive valve core; 631. Three-way valve channel. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] See attached Figure 1 -Attached Fig.10 The stratified sampling equipment for water quality monitoring includes a flying device 100 that can float on a water body, a water sampling device 500 installed at the lower end of the flying device 100, and a reeling device 200 for controlling the vertical state of the water sampling device 500. The water sampling device 500 can be placed in the water body through the reeling device 200. By unfolding the water sampling device 500, the water content of different water layers in the water body can be sampled and monitored, thereby meeting the needs of water body monitoring.

[0033] The above method can realize unmanned automatic flight sampling, which greatly improves the efficiency of water sampling. It is especially suitable for sampling and monitoring of water bodies in some uninhabited areas, mountainous areas and other places that are difficult to access.

[0034] Most of the traditional water sampling devices 500 are retractable multi-layer casing structures. By controlling the extension length of the water sampling device 500, water sampling of the corresponding water layer can be achieved through different casings. However, the traditional water sampling device 500 has a large structural mass and is difficult to be stably and conveniently installed under the flying device 100, which affects the flight radius of the overall equipment operation. In addition, the traditional casing telescopic structure has a complex internal structure. In the process of complex or long-term continuous sampling in some water environments, the failure rate is high, resulting in inaccurate or even failure of water sampling monitoring results.

[0035] In order to solve the above problems, the improved water sampling device 500 includes a water sampling hose 520. The water sampling hose 520 is made of soft material and has a hollow design, which can realize the transportation of water. A plurality of conduction control valve groups 600 are fixed on the surface of the water sampling hose 520 and are distributed at intervals. A counterweight device 400 is installed at the bottom of the water sampling hose 520, and a downward gravity can be applied to the water sampling hose 520 through the counterweight device 400. The top of the water sampling hose 520 is provided with a 520 is connected to the extraction device 300; wherein, the water sampling hose 520 is vertically arranged in the water body through the unwinding device 200 and the counterweight device 400, and the conduction control valve group 600 is controlled in turn to be in the first conduction state to realize multi-point sampling of different water layers of the water body. Further, it is preferred to control the conduction control valve group 600 in the first conduction state from top to bottom to realize multi-point sampling of different water layers of the water body; through the above method, water sampling of different water layers can be carried out from top to bottom in sequence, and the specific steps are as follows.

[0036] First, the first conduction control valve group 600 located at the top is in a first state of conduction with the water body, and the remaining conduction control valve groups 600 are in a second state of being closed to the water body. At this time, the water layer corresponding to the first conduction control valve group 600 can be sampled and monitored; after the sampling of the water layer corresponding to the first conduction control valve group 600 is completed, the second conduction control valve group 600 located below the first conduction control valve group 600 is controlled to be in the first state of conduction with the water body, and the remaining conduction control valve groups 600 are in the second state of being closed to the water body. At this time, sampling and monitoring of the water layer corresponding to the second conduction control valve group 600 can be achieved; according to the same method as above, multi-point sampling and monitoring of different water layers of the water body can be achieved in turn, thereby improving the efficiency of water body sampling and monitoring.

[0037] It should be noted here that when the conduction control valve group 600 is in the first state, the conduction control valve group 600 and the external water body are in a conduction state, and the bottom of the conduction control valve group 600 is in a closed state to ensure the unidirectional flow of water in the water body; when the conduction control valve group 600 is in the second state, the conduction control valve group 600 and the external water body are in a closed state. At this time, the conduction control valve group 600 is located in the water sampling hose 520 and is in a conduction state that penetrates from top to bottom, so that the water in the bottom water layer can flow through normally, thereby ensuring the normal progress of water sampling and monitoring.

[0038] It should also be noted here that in order to ensure the accuracy of the water sampling results, during the extraction and sampling process of the second and lower conduction control valve groups 600, the extraction time of the extraction device 300 can be extended, and the front liquid can be discharged to allow the water in the corresponding water layer to flush the pipeline, thereby ensuring the accuracy of the water sampling results.

[0039] In summary, through the above structure, compared with the traditional multi-layer sleeve structure, the setting of the water sampling hose 520 does not take up too much volume, and the material is soft and light, which reduces the burden of continuous flight of the flying device 100 and increases the flight radius of sampling and monitoring of the flying device 100; at the same time, by controlling the conduction control valve group 600 to be turned on in sequence, rapid sampling of water bodies at different levels can be achieved. The overall structure control method is simple and easy to use, which reduces the failure rate and ensures the accuracy and stability of water monitoring results.

[0040] Please refer to the attached Figure 5 The unwinding device 200 here includes an unwinding control shaft 220 rotatably connected to the flying device 100, and an unwinding control roller 210 fixed to the outside of the unwinding control shaft 220. The unwinding control roller 210 is hollow and sealed. The unwinding control shaft 220 is externally connected to a driving motor, which can control the rotation of the unwinding control roller 210 and the unwinding control shaft 220. The unwinding control roller 210 can realize the winding and unwinding of the water sampling hose 520 during the rotation process. The water sampling hose 520 is wound up in the flying state to reduce the space volume and ensure the flight stability of the water sampling device 500. It is unwound in the sampling state to realize vertical sampling of the water sampling hose 520.

[0041] In addition, the unwinding control roller 210 has a hollow sealed design, and the overall structure can act as a float, generating buoyancy for the overall device, ensuring that the overall structure can stably float on the water surface and ensuring stability during the sampling process.

[0042] Please refer to the attached Figure 6 A first connection part 530 connected to the counterweight device 400 is arranged at the bottom of the water sampling hose 520, and a second connection part 510 connected to the extraction device 300 is arranged at the top of the water sampling hose 520. The second connection part 510 is also hollow in design. The second connection part 510 is connected to the water sampling hose 520 to realize continuous transportation of water. The second connection part 510 is connected to the extraction device 300 to ensure the stability of water transportation; the first connection part 530 can be solid in design and located at the bottom to play a connecting role to ensure the stability of the connection of the counterweight device 400.

[0043] Please refer to the attached Figure 5Specifically, the extraction device 300 includes an extraction component 310 fixedly connected to the flying device 100, the extraction component 310 is connected to an extraction hose 320, and a rotating seal 330 is installed at the axis of the unwinding control shaft 220. The extraction hose 320 and the second connecting portion 510 are connected through the rotating seal 330 to achieve continuous transportation of water; the rotating seal 330 and the extraction hose 320 are rotationally sealed and connected. Through the design of the rotating seal 330, during the rotation of the unwinding control drum 210, continuous transportation of water in the water body can be achieved, the risk of tube entanglement is eliminated, the failure rate of the overall equipment is further reduced, and the normal water sampling is ensured.

[0044] Furthermore, the extraction component 310 includes a first docking joint inside, which is connected to the extraction hose 320 through a telescopic hose. Several second docking joints are installed on the moving path of the first docking joint, and the second docking joints are connected to multiple containers for storing the sampled water. The first second docking joint located at the front end is a drainage pipe. During the pipeline cleaning process, the first docking joint is controlled to dock with the docking joint to achieve the discharge of the water body. A mechanical locking structure can be selected between the first docking joint and the second docking joint, which can be an electrically telescopic locking structure. After docking, the connection is sealed to achieve sealed water transportation. A one-way valve is installed in the container to prevent reverse overflow of water.

[0045] It also includes a driving component 312 for controlling the linear movement of the first docking joint and an electric control device 311 for controlling the movement of the driving component 312. The driving component 312 here can be selected as a combination of a screw and a screw sleeve. When the electric control device 311 controls the rotation of the screw, the screw sleeve can be controlled to be in different positions to achieve movement control. The above-mentioned driving component 312 structure can also be selected as an electric telescopic rod or an electric slider structure to achieve drive control.

[0046] Please refer to the attached Figure 7 Specifically, the conduction control valve group 600 includes a conduction valve seat 610 sealed and fixed in the water sampling hose 520, a first conduction opening 611 is opened on the top of the conduction valve seat 610, a second conduction opening 612 is opened on the side wall of the conduction valve seat 610, and a conduction valve core 630 is also sealed and rotatably connected in the conduction valve seat 610, a three-way valve channel 631 is opened inside the conduction valve core 630, and the conduction valve core 630 is externally connected to a rotation control device, which can control the rotation of the conduction valve core 630.

[0047] When the conduction valve core 630 rotates to the first position (see Figure 7 ), at this time, the conduction control valve group 600 is in the first state, and the water sampling hose 520 is connected to the water body through the conduction control valve group 600 to achieve sampling monitoring of the water body.

[0048] When the conduction valve core 630 rotates to the second position (see Figure 8 The conduction control valve group 600 is in the second state, and the conduction control valve group 600 and the water body are in a closed state. The three-way valve channel 631 conducts the first conduction opening 611 to make the water sampling hose 520 in this position in an up-and-down conduction state, thereby ensuring normal sampling of the water body.

[0049] By rotating the conducting valve core 630, rapid switching and reversing can be achieved, the response speed is fast, and the sampling efficiency is improved. At the same time, the sealing performance of the conducting valve core 630 is good, which avoids liquid leakage and mixing, and ensures the accuracy of the sampling results.

[0050] A filter device 620 is detachably installed on the outside of the second conducting opening 612. The outside of the second conducting opening 612 is protected by the filter device 620, which can filter out most impurities in the water body, ensure the cleanliness of the internal environment of the water sampling hose 520, avoid blockage of related structures, and ensure normal water sampling.

[0051] It is preferred to arrange two water sampling hoses 520 in a row, both of which are connected to the extraction device 300, and an electromagnetic valve is installed at the connection between the two water sampling hoses 520 and the extraction device 300. The first water sampling hose 520 serves as a water sampling pipeline, which can sample and monitor water at different levels in different water bodies. The second water sampling hose 520 serves as a cleaning pipeline. Under the action of the extraction device 300 and the electromagnetic valve, the reverse direction of liquid flow is changed, and reverse cleaning of the first water sampling hose 520 can be achieved, eliminating blockage of the water sampling hose 520 and the outside of the filter device 620, thereby ensuring that the first water sampling hose 520 can perform water sampling normally.

[0052] It should be noted here that the two water sampling hoses 520 are arranged in parallel, and the positions of the conduction control valve groups 600 on the surfaces of the two water sampling hoses 520 are the same. In the process of extracting water around the second water sampling hose 520 for back flushing, the conduction control valve groups 600 at the same positions on the surfaces of the two water sampling hoses 520 are controlled to be in a conduction state, and the water in the same water layer circulates between the two water sampling hoses 520, avoiding cross-contamination of water in different water layers, further ensuring the accuracy of water sampling and monitoring, and improving the efficiency of water sampling.

[0053] It should be noted here that, under normal conditions, all of the conduction control valve groups 600 on the surface of the second water sampling hose 520 are in the second state of being closed to the water body.

[0054] Please refer to the attached Figure 3Specifically, the counterweight device 400 includes a counterweight base 410, the inner wall of the counterweight base 410 is rotatably connected to an adjusting roller 420, the surface of the adjusting roller 420 is wrapped with an adjusting rope 440, the end of the adjusting rope 440 is fixedly connected to the bottom of the water sampling hose 520, and the side wall of the counterweight base 410 is also fixed with an adjusting element 430 for controlling the rotation of the adjusting roller 420. The water sampling hose 520 can be protected by the above structure, and the counterweight device 400 structure can be unwound by the adjusting rope 440 first, thereby reducing the surface force of the water sampling hose 520, thereby increasing the service life of the water sampling hose 520, while also avoiding damage and ensuring the accuracy of the sampling results.

[0055] Please refer to the attached Fig. 9 and attached Fig.10 In the first stage, the adjusting rope 440 is unwound by controlling the adjusting element 430, so that the counterweight device 400 is at the bottom of the water body, reducing the pulling effect of the counterweight device 400 on the water sampling hose 520; in the second stage, the unwinding device 200 and the adjusting element 430 are coordinated and controlled to rotate, and the water sampling hose 520 is pulled by the adjusting rope 440. Under a relatively low and controllable pulling force, the water sampling hose 520 is unfolded, so that the water sampling hose 520 is in a relatively vertical state in the water body, thereby realizing stratified monitoring of different water layers in the water body.

[0056] The process of lifting the counterweight device 400 is opposite to the process of unwinding it, which can also prevent the water sampling hose 520 from directly bearing the gravity of the counterweight device 400, thereby protecting the structure of the water sampling hose 520.

[0057] Finally, it should be noted that the rotating control elements used in this equipment are all designed to be waterproof to ensure their normal rotation under a certain water pressure. Electric or pneumatic control can be selected, and the overall structure is connected to an external central controller for coordinated control, realizing automatic multi-point sampling of water bodies, greatly improving the efficiency of water monitoring.

[0058] The present invention is further described below in conjunction with the method of use.

[0059] The stratified sampling method for water quality monitoring, using the above-mentioned stratified sampling equipment for water quality monitoring, comprises the following steps:

[0060] S1. Control the flying device 100 to fly above a predetermined water body. After reaching the predetermined water body, control the flying device 100 to descend and control the flying device 100 to float on the water body. The flying device 100 floats on the water body and is in a relatively stable state. The flying device 100 here includes a flying platform 110, a spiral blade 120 and a supporting device 130. The supporting device 130 includes a supporting frame 131, a first supporting plate 132 and a second supporting plate 133. The supporting frame 131 is an arc-shaped frame structure, which can ensure that the overall structure is stably placed on the ground. The first supporting plate 132 and the second supporting plate 133 are mutually intersecting plate structures, which are used to install a water sampling structure.

[0061] S2. The water sampling hose 520 is arranged vertically in the water body through the unwinding device 200 and the counterweight device 400. Specifically, the unwinding device 200 is controlled to rotate, and the counterweight device 400 moves toward the bottom of the water under the action of gravity. The bottom of the water sampling hose 520 is pulled by the gravity of the counterweight device 400, and the top of the water sampling hose 520 is limited by the unwinding device 200 and is in a relatively vertical state.

[0062] S3. Control the conduction control valve group 600 in the first conduction state in sequence to achieve multi-point sampling of different water layers of the water body, and store the sampling results separately to ensure the accuracy of the water body sampling monitoring results.

[0063] The sampling device has a simple structure, low overall mass, and is easy to control. It is suitable for rapid sampling of reservoir areas that are difficult for staff to access. It has high sampling efficiency, a stable sampling process, and accurate sampling results.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water quality monitoring layered sampling device, comprising a flying device (100) that can float on a water body, a water body sampling device (500) installed at the lower end of the flying device (100), and an unwinding device (200) for controlling the vertical state of the water body sampling device (500), characterized in that: The water sampling device (500) comprises a water sampling hose (520), a plurality of conduction control valve groups (600) arranged at intervals are fixed on the surface of the water sampling hose (520), a counterweight device (400) is installed at the bottom of the water sampling hose (520), and an extraction device (300) connected to the water sampling hose (520) is arranged at the top of the water sampling hose (520); The water sampling hose (520) is arranged vertically in the water body by means of the unwinding device (200) and the counterweight device (400), and the conduction control valve group (600) is sequentially controlled to be in the first conduction state, thereby achieving multi-point sampling of different water layers in the water body; The conduction control valve assembly (600) comprises a conduction valve seat (610) sealed and fixed in a water sampling hose (520); a first conduction opening (611) is formed on the top of the conduction valve seat (610); a second conduction opening (612) is formed on the side wall of the conduction valve seat (610); a conduction valve core (630) is also sealably rotatably connected in the conduction valve seat (610); a three-way valve channel (631) is formed in the conduction valve core (630); A filtering device (620) is detachably mounted on the outer side of the second conducting opening (612); The counterweight device (400) comprises a counterweight base (410), the inner wall of the counterweight base (410) being rotatably connected to an adjusting roller (420), an adjusting rope (440) being wound around the surface of the adjusting roller (420), the end of the adjusting rope (440) being fixedly connected to the bottom of a water sampling hose (520), and an adjusting element (430) for controlling the rotation of the adjusting roller (420) being also fixed to the side wall of the counterweight base (410).

2. The water quality monitoring stratified sampling equipment according to claim 1 is characterized in that: The unwinding device (200) comprises an unwinding control shaft (220) rotatably connected to the flying device (100), and an unwinding control roller (210) fixed to the outside of the unwinding control shaft (220); the unwinding control roller (210) is of hollow sealed design.

3. The water quality monitoring stratified sampling equipment according to claim 2 is characterized in that: A first connection portion (530) connected to the counterweight device (400) is provided at the bottom of the water sampling hose (520), and a second connection portion (510) in communication with the extraction device (300) is provided at the top of the water sampling hose (520).

4. The water quality monitoring stratified sampling equipment according to claim 3 is characterized in that: The extraction device (300) comprises an extraction assembly (310) fixedly connected to the flying device (100), the extraction assembly (310) being connected to an extraction hose (320), a rotating seal (330) being installed at the axis of the unwinding control shaft (220), and the extraction hose (320) and the second connection part (510) being connected via the rotating seal (330) to achieve continuous transport of water.

5. The water quality monitoring stratified sampling equipment according to claim 4 is characterized in that: The extraction assembly (310) comprises a first docking joint inside, the first docking joint being connected to an extraction hose (320) via a telescopic hose, a plurality of second docking joints being installed on a moving path of the first docking joint, and further comprising a driving assembly (312) for controlling the linear movement of the first docking joint and an electric control device (311) for controlling the movement of the driving assembly (312).

6. The water quality monitoring stratified sampling equipment according to claim 1 is characterized in that: The water body sampling hoses (520) are two arranged in a row, and the two water body sampling hoses (520) are both connected to the extraction device (300), and electromagnetic valves are installed at the connection points between the two water body sampling hoses (520) and the extraction device (300).

7. A stratified sampling method for water quality monitoring, characterized in that: Using the water quality monitoring stratified sampling device according to any one of claims 1 to 6 comprises the following steps: S1, controlling the flying device (100) to fly above a predetermined water body, and after reaching the predetermined water body, controlling the flying device (100) to descend, and controlling the flying device (100) to float on the water body; S2, vertically arranging the water sampling hose (520) in the water body by means of the unwinding device (200) and the counterweight device (400); in the first stage, controlling the unwinding of the adjusting rope (440) by means of the adjusting element (430), so that the counterweight device (400) is located at the bottom of the water body, thereby reducing the pulling effect of the counterweight device (400) on the water sampling hose (520); in the second stage, cooperatively controlling the rotation of the unwinding device (200) and the adjusting element (430), pulling the water sampling hose (520) by means of the adjusting rope (440), and achieving the unfolding of the water sampling hose (520) under a relatively low and controllable pulling force, so that the water sampling hose (520) is located in a relatively vertical state in the water body; S3, sequentially controlling the conduction control valve group (600) to be in the first conduction state, so as to achieve multi-point sampling of different water layers of the water body.

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