Water quality sampling device for monitoring underwater pollutants

Abstract

The invention discloses a water quality sampling device for underwater pollutant monitoring, and relates to the technical field of environmental monitoring, the water quality sampling device comprises universal wheels, a moving box and a main branch pipe, and also comprises an L-shaped support plate, a temporary storage tank, a lifting mechanism arranged on the moving box, a connecting hose, a vacuum mechanism arranged on the temporary storage tank, a flushing mechanism arranged on the L-shaped support plate, and a discharge pipe, a collection box; through cooperation of a main branch pipe, a temporary storage tank, a lifting mechanism, a connecting hose, a vacuum mechanism, a discharging pipe and a collecting box, the main branch pipe moves up and down under the action of the lifting mechanism, so that sampling is carried out at different depths and collected in the collecting box, independent collection and storage of pollutants at different depths are realized, and the sampling efficiency is improved. The real pollution layering state is effectively reflected, so that the pollutant monitoring accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring, and in particular to a water quality sampling device for monitoring underwater pollutants. Background Art

[0002] With the rapid development of industrialization and urbanization, water pollution is becoming increasingly serious. In particular, the spread and deposition of underwater pollutants pose a long-term threat to the ecological environment and human health. To effectively monitor water quality, assess water environment quality, and develop scientific pollution prevention and control measures, water quality sampling is particularly important as the first step in obtaining water pollution information.

[0003] However, pollutants are distributed in a gradient in water bodies. Most water quality sampling devices at this stage can only sample at a single depth, which makes it difficult to reflect the true state of pollution stratification, resulting in inaccurate pollutant monitoring. Therefore, improvement is urgently needed. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a water quality sampling device for underwater pollutant monitoring, aiming to solve the above-mentioned technical problems that sampling can only be carried out at a single depth, it is difficult to reflect the actual pollution stratification state, and the pollutant monitoring is inaccurate.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A water quality sampling device for underwater pollutant monitoring, comprising universal wheels, a mobile box and a main branch pipe, and further comprising: There are two L-shaped support plates, which are symmetrically fixed on the mobile box; There are two temporary storage tanks, which are fixed on the L-shaped support plate; A lifting mechanism is provided on the movable box and is used to drive the main branch pipe to move up and down; Two connecting hoses are provided, and the two connecting hoses are arranged on the temporary storage tank, and one end of the connecting hose is fixedly connected to the temporary storage tank; A vacuum mechanism is provided on the temporary storage tank and is used to reduce the air pressure in the temporary storage tank; A flushing mechanism, provided on the L-shaped support plate, for flushing the temporary storage tank; A discharge pipe is provided on the temporary storage tank, and one end of the discharge pipe is fixedly connected to the temporary storage tank; There are multiple collection boxes, which are arranged on the mobile box and are slidably connected to the mobile box.

[0006] Preferably, the lifting mechanism comprises: A first motor is fixedly mounted on the moving box; a screw, rotatably disposed on the moving box, one end of the screw being fixedly connected to an output end of the first motor; A movable plate is provided on the screw rod and is threadedly connected to the screw rod, and the movable plate is slidably connected to the movable box; A lifting plate, fixedly arranged on the movable plate; The lifting assembly is arranged on the lifting plate.

[0007] Preferably, a lifting slot is provided on the moving box to provide a space for the screw to rotate and a lifting track for the moving plate.

[0008] Preferably, the lifting assembly comprises: A hydraulic cylinder is fixedly mounted on the lifting plate; a fixed plate, disposed on the hydraulic cylinder and fixedly connected to the hydraulic cylinder; A fixed column, fixedly arranged on the fixed plate; an isolation shell, disposed on the fixing column and fixedly connected to the fixing column, and the isolation shell is fixedly connected to the main branch pipe; There are two branch pipes, which are symmetrically fixed on the fixing plate, one end of each branch pipe is fixedly connected to the main branch pipe, and the other end of each branch pipe is fixedly connected to one end of the connecting hose; The sealing assembly is arranged on the isolation shell.

[0009] Preferably, the branch pipe is provided with two solenoid valves for controlling the on-off between the main branch pipe and the branch pipe.

[0010] Preferably, the sealing assembly comprises: An electric telescopic rod, fixedly disposed in the isolation shell; a first piston, disposed on the electric telescopic rod and fixedly connected to the electric telescopic rod, and the first piston is fixedly connected to the main branch pipe; a connecting column, fixedly disposed on the first piston; The second piston is fixedly arranged on the connecting column and is slidably connected to the main branch pipe.

[0011] Preferably, the vacuum mechanism comprises: A vacuum pump is fixedly mounted on the temporary storage tank; A vacuum pumping pipe is provided on the vacuum pump, one end of the vacuum pumping pipe is fixedly connected to the vacuum pump, and the other end of the vacuum pumping pipe is fixedly connected to the temporary storage tank.

[0012] Preferably, the flushing mechanism comprises: A cleaning liquid storage tank, fixedly mounted on the mobile tank; There are two liquid supply pumps, which are fixedly arranged on the L-shaped support plate; There are two liquid extraction pipes, which are arranged on the liquid supply pump, and one end of each liquid extraction pipe is fixedly connected to the output end of the liquid supply pump; An infusion tube is provided on the liquid supply pump, one end of the infusion tube is fixedly connected to the liquid supply pump, and the other end of the infusion tube is fixedly connected to the temporary storage tank.

[0013] Preferably, a first one-way valve is provided on the temporary storage tank for controlling the connection and disconnection between the infusion tube and the temporary storage tank, and preventing the liquid in the temporary storage tank from flowing into the infusion tube; a second one-way valve is provided on the temporary storage tank for controlling the connection and disconnection between the temporary storage tank and the discharge pipe; a third one-way valve is provided on the temporary storage tank for controlling the connection and disconnection between the connecting hose and the temporary storage tank.

[0014] Preferably, the mobile box is provided with a first box door for opening the mobile box to facilitate the operator to add cleaning liquid to the cleaning liquid storage box; the mobile box is symmetrically provided with two second box doors for the operator to replace different collection boxes.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. Through the coordination between the main branch pipe, temporary storage tank, lifting mechanism, connecting hose, vacuum mechanism, discharge pipe and collection box, the main branch pipe can be moved up and down under the action of the lifting mechanism, so that samples can be taken at different depths and collected in the collection box, realizing the independent collection and storage of pollutants at different depths, effectively reflecting the real pollution stratification state, and thus improving the accuracy of pollutant monitoring.

[0016] 2. Through the cooperation between the cleaning mechanism, temporary storage tank, vacuum mechanism, discharge pipe, connecting hose and lifting mechanism, the inside of the temporary storage tank is cleaned after completing one sampling, and then the cleaning liquid is transported to the entire sampling pipeline through the vacuum mechanism, thereby removing the pollutants remaining in the last sampling pipeline, reducing sample contamination, and further improving the accuracy of pollutant monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1The present invention shows a schematic diagram of the three-dimensional structure of a water quality sampling device for underwater pollutant monitoring.

[0019] Figure 2 Shown Figure 1 rear view.

[0020] Figure 3 Shown Figure 1 Schematic diagram of part of the three-dimensional structure.

[0021] Figure 4 Shown Figure 3 Side cross-sectional view of .

[0022] Figure 5 Shown Figure 4 A local enlarged schematic diagram of point A in the middle.

[0023] Figure 6 Shown Figure 4 Front cross-sectional view of .

[0024] Figure 7 Shown Figure 6 A partial enlarged schematic diagram of point B in the middle.

[0025] Figure 8 Shown Figure 3 Rear cross-sectional view of .

[0026] Legend: 1. Universal wheel; 2. Mobile box; 3. Main branch pipe; 4. L-shaped support plate; 5. Temporary storage tank; 6. Connecting hose; 7. Discharge pipe; 8. Collection box; 9. First motor; 10. Screw; 11. Mobile plate; 12. Lifting plate; 13. Lifting trough; 14. Hydraulic cylinder; 15. Fixed plate; 16. Fixed column; 17. Isolation shell; 18. Branch pipe; 19. Solenoid valve; 20. Electric telescopic rod; 21. First piston; 22. Connecting column; 23. Second piston; 24. Vacuum pump; 25. Vacuum exhaust pipe; 26. Cleaning liquid storage tank; 27. Liquid supply pump; 28. Liquid extraction pipe; 29. ​​Infusion pipe; 30. First one-way valve; 31. Second one-way valve; 32. Third one-way valve; 33. First box door; 34. Second box door. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0029] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0031] Reference Figures 1 to 8 An embodiment of a water quality sampling device for underwater pollutant monitoring according to the present invention is further described.

[0032] A water quality sampling device for underwater pollutant monitoring includes a universal wheel 1, a mobile box 2, and a main branch pipe 3. The universal wheel 1 is arranged on the mobile box 2 to facilitate the movement of the entire device; and further includes: The mobile box 2 is provided with a first box door 33 for opening the mobile box 2 to facilitate the operator to add cleaning liquid to the cleaning liquid storage box 26; the mobile box 2 is symmetrically provided with two second box doors 34 for the operator to replace different collection boxes 8.

[0033] There are two L-shaped support plates 4, which are symmetrically fixed on the mobile box 2; they play a supporting role for the temporary storage tank 5 and the liquid supply pump 27; There are two temporary storage tanks 5, which are fixed on the L-shaped support plate 4; a first one-way valve 30 is provided on the temporary storage tank 5 to control the connection between the infusion tube 29 and the temporary storage tank 5, and to prevent the liquid in the temporary storage tank 5 from flowing into the infusion tube 29; a second one-way valve 31 is provided on the temporary storage tank 5 to control the connection between the temporary storage tank 5 and the discharge pipe 7; a third one-way valve 32 is provided on the temporary storage tank 5 to control the connection between the connecting hose 6 and the temporary storage tank 5.

[0034] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 6 As a preferred embodiment, the lifting mechanism is provided on the moving box 2 to drive the main branch pipe 3 to move up and down; the lifting mechanism includes: The first motor 9 is fixedly mounted on the moving box 2; The screw 10 is rotatably mounted on the moving box 2, and one end of the screw 10 is fixedly connected to the output end of the first motor 9; The movable plate 11 is provided on the screw rod 10 and is threadedly connected to the screw rod 10. The movable plate 11 is slidably connected to the movable box 2; The lifting plate 12 is fixedly arranged on the movable plate 11; A lifting slot 13 is provided on the moving box 2 to provide a space for the screw 10 to rotate and a trajectory for the moving plate 11 to move up and down.

[0035] During operation, the first motor 9 is started, and the first motor 9 drives the screw 10 fixedly connected to its output end to rotate, and the screw 10 drives the movable plate 11 to move up and down along the lifting groove 13, and the movable plate 11 drives the lifting plate 12 to move up and down, and the lifting plate 12 is used to drive the hydraulic cylinder 14 to move up and down, thereby driving the lifting assembly to move up and down, and then driving the main branch pipe 3 to move up and down, so as to adapt to water quality sampling at different depths; Reference Figure 2 、 Figure 6 and Figure 7 As a preferred embodiment, the lifting assembly is provided on the lifting plate 12. The lifting assembly includes: The hydraulic cylinder 14 is fixedly mounted on the lifting plate 12; The fixing plate 15 is provided on the hydraulic cylinder 14 and is fixedly connected to the hydraulic cylinder 14; A fixed column 16 is fixedly mounted on the fixed plate 15; The isolation shell 17 is provided on the fixing column 16 and fixedly connected to the fixing column 16. The isolation shell 17 is fixedly connected to the main branch pipe 3; it is used to protect the electric telescopic rod 20 and prevent water from intruding and damaging the electric telescopic rod 20.

[0036] There are two branch pipes 18, which are symmetrically fixed on the fixed plate 15. One end of the branch pipe 18 is fixedly connected to the main branch pipe 3, and the other end of the branch pipe 18 is fixedly connected to one end of the connecting hose 6; the branch pipe 18 is provided with two solenoid valves 19 for controlling the on-off between the main branch pipe 3 and the branch pipe 18.

[0037] During operation, the hydraulic cylinder 14 is started, and the hydraulic cylinder 14 drives the fixed plate 15 to move up and down, the fixed plate 15 drives the fixed column 16 and the branch pipe 18 to move up and down, the fixed column 16 drives the isolation shell 17 to move up and down, and the isolation shell 17 and the branch pipe 18 cooperate to further drive the main branch pipe 3 to move up and down, thereby driving the main branch pipe 3 to reach deeper water areas, further improving the sampling depth and the diversity of collecting water samples at different levels.

[0038] Reference Figure 7 As a preferred embodiment, the sealing assembly is provided on the isolation shell 17. The sealing assembly includes: The electric telescopic rod 20 is fixedly disposed in the isolation shell 17; The first piston 21 is provided on the electric telescopic rod 20 and is fixedly connected to the electric telescopic rod 20. The first piston 21 is fixedly connected to the main branch pipe 3. The first piston 21 is used to cooperate with the main branch pipe 3 and the isolation cover to form a sealed space to protect the electric telescopic rod 20. The connecting column 22 is fixedly mounted on the first piston 21; The second piston 23 is fixedly mounted on the connecting column 22 and is slidably connected to the main branch pipe 3 .

[0039] During operation, the electric telescopic rod 20 is started, and the electric telescopic rod 20 drives the first piston 21 to move up and down, the first piston 21 drives the connecting column 22 to move up and down, and the connecting column 22 drives the second piston 23 to move up and down. When the second piston 23 moves out of the main branch pipe 3, the main branch pipe 3 is opened, thereby performing sampling at a certain depth. When the second piston 23 moves into the main branch pipe 3, the main branch pipe 3 is closed, thereby ending sampling at the current depth. There are two connecting hoses 6, which are arranged on the temporary storage tank 5, and one end of the connecting hose 6 is fixedly connected to the temporary storage tank 5; Reference Figure 4 and Figure 5 As a preferred embodiment, a vacuum mechanism is provided on the temporary storage tank 5 to reduce the air pressure in the temporary storage tank 5; the vacuum mechanism includes: The vacuum pump 24 is fixedly mounted on the temporary storage tank 5; The vacuum exhaust pipe 25 is provided on the vacuum pump 24 , one end of the vacuum exhaust pipe 25 is fixedly connected to the vacuum pump 24 , and the other end of the vacuum exhaust pipe 25 is fixedly connected to the temporary storage tank 5 .

[0040] During operation, the first one-way valve 30 and the second one-way valve 31 are closed, the third one-way valve 32 and the solenoid valve 19 are opened, and the vacuum pump 24 is started. The vacuum pump 24 extracts the air in the temporary storage tank 5 through the vacuum exhaust pipe 25, so that a negative pressure is formed in the temporary storage tank 5, so that the water in the target water area passes through the main branch pipe 3, the branch pipe 18 and the connecting hose 6 in sequence to reach the temporary storage tank 5, thereby achieving collection of the target water area; Reference Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 8 As a preferred embodiment, a flushing mechanism is provided on the L-shaped support plate 4 for flushing the temporary storage tank 5; the flushing mechanism includes: The cleaning liquid storage tank 26 is fixedly mounted on the mobile tank 2; There are two liquid supply pumps 27, which are fixed on the L-shaped support plate 4; There are two liquid extraction pipes 28, which are arranged on the liquid supply pump 27, and one end of the liquid extraction pipe 28 is fixedly connected to the output end of the liquid supply pump 27; The liquid infusion tube 29 is provided on the liquid supply pump 27 . One end of the liquid infusion tube 29 is fixedly connected to the liquid supply pump 27 , and the other end of the liquid infusion tube 29 is fixedly connected to the temporary storage tank 5 .

[0041] During operation, the first one-way valve 30 is opened, the second one-way valve 31 and the third one-way valve 32 are closed, and the liquid supply pump 27 is started. The liquid supply pump 27 collects the cleaning liquid in the cleaning liquid storage tank 26 through the liquid extraction pipe 28, and transports it to the temporary storage tank 5 through the liquid infusion pipe 29 to complete the flushing of the temporary storage tank 5. When the flushing is completed, the first one-way valve 30 is closed, the second one-way valve 31 and the third one-way valve 32 are opened, and air is injected into the temporary storage tank 5 through the vacuum pump 24, so that the air pressure in the temporary storage tank 5 is increased, thereby transporting the cleaning liquid to the entire sampling pipeline, removing the pollutants remaining in the last sampling pipeline, thereby reducing the pollution of the next sampling, and further improving the accuracy of pollutant monitoring.

[0042] The discharge pipe 7 is provided on the temporary storage tank 5, and one end of the discharge pipe 7 is fixedly connected to the temporary storage tank 5; There are multiple collection boxes 8, and the multiple collection boxes 8 are set on the moving box 2 and are slidably connected to the moving box 2.

[0043] During operation, when a certain amount of water is stored in the temporary storage tank 5, the third one-way valve 32 is closed, the second one-way valve 31 is opened, and the vacuum pump 24 injects air into the temporary storage tank 5, so that the water in the temporary storage tank 5 flows into the collection box 8 through the discharge pipe 7, completing the water quality sampling at a certain depth. When the collection is completed, the second box door 34 is opened, and a different collection box 8 is replaced for the next collection.

[0044] Working principle: By moving the device to the target area, starting the first motor 9, the first motor 9 drives the screw 10 fixedly connected to its output end to rotate, the screw 10 drives the movable plate 11 to move downward along the lifting groove 13, the movable plate 11 drives the lifting plate 12 to move downward, the lifting plate 12 drives the hydraulic cylinder 14 to move downward, the hydraulic cylinder 14 drives the fixed plate 15 to move downward, the fixed plate 15 drives the fixed column 16 and the branch pipe 18 to move downward, the fixed column 16 drives the isolation shell 17 to move downward, the isolation shell 17 and the branch pipe 18 drive the main branch pipe 3 to move downward, thereby adapting to different depths Water quality sampling of degree; start the hydraulic cylinder 14, the hydraulic cylinder 14 further drives the fixed plate 15 to move downward, thereby driving the main branch pipe 3 and the branch pipe 18 to move further downward to reach a deeper water area, further increasing the sampling depth; when sampling, start the electric telescopic rod 20, the electric telescopic rod 20 drives the first piston 21 to move downward, the first piston 21 drives the second piston 23 to move downward through the connecting column 22, so that the second piston 23 moves out of the main branch pipe 3, at this time close the first one-way valve 30 and the second one-way valve 31, open the third one-way valve 32 and the solenoid valve 19, Start the vacuum pump 24, which extracts the air in the temporary storage tank 5 through the vacuum exhaust pipe 25, so that a negative pressure is formed in the temporary storage tank 5, so that the water in the target water area passes through the main branch pipe 3, the branch pipe 18 and the connecting hose 6 in turn to reach the temporary storage tank 5, and is temporarily collected. At this time, the third one-way valve 32 is closed, and the second one-way valve 31 is opened. The vacuum pump 24 injects air into the temporary storage tank 5, so that the water in the temporary storage tank 5 flows through the discharge pipe 7 to the collection box 8, completing the water quality sampling at a certain depth. When the collection is completed, the first one-way valve 30 is opened, and the second one-way valve 31 and the third one-way valve are closed. Valve 32, start the liquid supply pump 27, the liquid supply pump 27 extracts the cleaning liquid in the cleaning liquid storage box 26 through the liquid extraction pipe 28, and transports it to the temporary storage tank 5 through the liquid infusion pipe 29 to complete the flushing of the temporary storage tank 5. When the flushing is completed, close the first one-way valve 30, open the second one-way valve 31 and the third one-way valve 32, and inject air into the temporary storage tank 5 through the vacuum pump 24, so that the air pressure in the temporary storage tank 5 is increased, thereby transporting the cleaning liquid to the entire sampling pipeline, clearing the pollutants remaining in the last sampling pipeline, thereby reducing the pollution of the next sampling, and further improving the accuracy of pollutant monitoring.

[0045] The above description of the embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water quality sampling device for underwater pollutant monitoring, comprising a universal wheel (1), a mobile box (2) and a main branch pipe (3), characterized in that: Also includes: Two L-shaped support plates (4) are provided, and the two L-shaped support plates (4) are symmetrically fixedly arranged on the movable box (2); There are two temporary storage tanks (5) (5), and the two temporary storage tanks (5) (5) are fixedly arranged on the L-shaped support plate (4); A lifting mechanism, provided on the movable box (2), for driving the main branch pipe (3) to move up and down; Two connecting hoses (6) are provided, and the two connecting hoses (6) are arranged on the temporary storage tank (5), and one end of the connecting hose (6) is fixedly connected to the temporary storage tank (5); A vacuum mechanism, provided on the temporary storage tank (5), for reducing the air pressure in the temporary storage tank (5); A flushing mechanism, provided on the L-shaped support plate (4), for flushing the temporary storage tank (5); A discharge pipe (7) is provided on the temporary storage tank (5), and one end of the discharge pipe (7) is fixedly connected to the temporary storage tank (5); A plurality of collecting boxes (8) are provided, and the plurality of collecting boxes (8) are arranged on the movable box (2) and are slidably connected to the movable box (2).

2. A water quality sampling device for underwater pollutant monitoring according to claim 1, characterized in that: The lifting mechanism comprises: A first motor (9) is fixedly mounted on the moving box (2); A screw rod (10) is rotatably mounted on the moving box (2), and one end of the screw rod (10) is fixedly connected to the output end of the first motor (9); A movable plate (11) is provided on the screw rod (10) and is threadedly connected to the screw rod (10); the movable plate (11) is slidably connected to the movable box (2); A lifting plate (12) is fixedly arranged on the movable plate (11); A lifting assembly is arranged on the lifting plate (12).

3. A water quality sampling device for underwater pollutant monitoring according to claim 2, characterized in that: The movable box (2) is provided with a lifting groove (13) for providing a space for the screw (10) to rotate and a lifting track for the movable plate (11).

4. A water quality sampling device for underwater pollutant monitoring according to claim 3, characterized in that: The lifting assembly comprises: A hydraulic cylinder (14) is fixedly mounted on the lifting plate (12); A fixed plate (15) is provided on the hydraulic cylinder (14) and is fixedly connected to the hydraulic cylinder (14); A fixed column (16) fixedly disposed on the fixed plate (15); An isolation shell (17) is disposed on the fixing column (16) and is fixedly connected to the fixing column (16); the isolation shell (17) is fixedly connected to the main branch pipe (3); Two branch pipes (18) are provided, and the two branch pipes (18) are symmetrically fixed on the fixing plate (15), one end of the branch pipe (18) is fixedly connected to the main branch pipe (3), and the other end of the branch pipe (18) is fixedly connected to one end of the connecting hose (6); A sealing assembly is arranged on the isolation shell (17).

5. A water quality sampling device for underwater pollutant monitoring according to claim 4, characterized in that: The branch pipe (18) is provided with two solenoid valves (19) for controlling the on-off between the main branch pipe (3) and the branch pipe (18).

6. A water quality sampling device for underwater pollutant monitoring according to claim 5, characterized in that: The sealing assembly comprises: An electric telescopic rod (20) is fixedly disposed in the isolation shell (17); A first piston (21) is provided on the electric telescopic rod (20) and is fixedly connected to the electric telescopic rod (20). The first piston (21) is fixedly connected to the main branch pipe (3); A connecting column (22) fixedly disposed on the first piston (21); The second piston (23) is fixedly mounted on the connecting column (22) and is slidably connected to the main branch pipe (3).

7. A water quality sampling device for underwater pollutant monitoring according to claim 6, characterized in that: The vacuum mechanism comprises: A vacuum pump (24) is fixedly mounted on the temporary storage tank (5); A vacuum pumping pipe (25) is provided on the vacuum pump (24), one end of the vacuum pumping pipe (25) is fixedly connected to the vacuum pump (24), and the other end of the vacuum pumping pipe (25) is fixedly connected to the temporary storage tank (5).

8. The water quality sampling device for underwater pollutant monitoring according to claim 7 is characterized in that: The flushing mechanism comprises: A cleaning liquid storage tank (26) is fixedly mounted on the mobile tank (2); Two liquid supply pumps (27) are provided, and the two liquid supply pumps (27) are fixedly arranged on the L-shaped support plate (4); Two liquid extraction pipes (28) are provided, and the two liquid extraction pipes (28) are arranged on the liquid supply pump (27), and one end of the liquid extraction pipe (28) is fixedly connected to the output end of the liquid supply pump (27); The liquid infusion tube (29) is arranged on the liquid supply pump (27), one end of the liquid infusion tube (29) is fixedly connected to the liquid supply pump (27), and the other end of the liquid infusion tube (29) is fixedly connected to the temporary storage tank (5).

9. The water quality sampling device for underwater pollutant monitoring according to claim 8, characterized in that: A first one-way valve (30) is provided on the temporary storage tank (5) for controlling the connection and disconnection between the liquid delivery tube (29) and the temporary storage tank (5) and preventing the liquid in the temporary storage tank (5) from flowing into the liquid delivery tube (29); a second one-way valve (31) is provided on the temporary storage tank (5) for controlling the connection and disconnection between the temporary storage tank (5) and the discharge pipe (7); and a third one-way valve (32) is provided on the temporary storage tank (5) for controlling the connection and disconnection between the connecting hose (6) and the temporary storage tank (5).

10. The water quality sampling device for underwater pollutant monitoring according to claim 9, characterized in that: The movable box (2) is provided with a first box door (33) for opening the movable box (2) to facilitate an operator to add cleaning liquid to the cleaning liquid storage box (26); the movable box (2) is symmetrically provided with two second box doors (34) for an operator to replace different collection boxes (8).

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