Floating island type water environment sampling device based on flow velocity self-adaption

Abstract

The invention relates to the technical field of water environment sampling, in particular to a flow velocity self-adaption-based floating island type water environment sampling device which comprises a floating island with a built-in driving device, and a sampling mechanism for sampling water and a guide mechanism for guiding the sampling mechanism are arranged in an inner cavity of the floating island. According to the floating island type water environment sampling device based on flow velocity self-adaption, a floating island driving and guide rope counterweight system ensures that a sampling cylinder is lowered along a vertical track, a guide rope penetrates through the center of the sampling cylinder, transverse displacement of the sampling cylinder is limited, lateral impact of water flow on the sampling cylinder is reduced, water layer disturbance is reduced, layered independent sampling and sealing guarantee are achieved, and the sampling efficiency is improved. The corresponding relation between the communication port and the water inlet tank is rotationally controlled, so that single-time lowering and multi-depth sampling are realized, and water samples are prevented from being mixed.

Description

Technical Field

[0001] The present invention relates to the technical field of water environment sampling, and particularly to a floating island type water environment sampling device based on flow velocity self - adaptation. Background Technique

[0002] Water environment sampling is a basic link in water quality monitoring, ecological research and pollution assessment. Its core goal is to accurately obtain the physical, chemical and biological parameters of water bodies at different depths. Although traditional sampling devices and existing technologies can meet basic requirements, there are the following significant defects in practical applications:

[0003] 1. Low positioning accuracy and poor anti - flow ability

[0004] Buoy drift problem:

[0005] Traditional buoy - type samplers (such as Niskin bottles, Van Dorn water samplers) rely on anchor chains or cables for fixation. However, in waters with a flow velocity > 1 m / s, the buoy is easily impacted by the water flow and generates lateral drift (the offset can reach several meters), resulting in the actual position of the sampling point deviating from the preset coordinates (such as the GPS calibration point), seriously affecting the spatial accuracy of the data.

[0006] Case: In a section of the middle reaches of the Yangtze River with a flow velocity of 2.5 m / s, the average lateral offset of traditional buoys reaches 3.2 m (Advances in Water Science, 2020), which cannot meet the requirements of ecological models for a < 1 m positioning error.

[0007] Passive guiding design:

[0008] Existing devices mostly use a single cable to be vertically lowered. However, in deep waters (> 20 m), the cable is easily bent by the lateral force of the water flow, causing the sampling cylinder to deviate from the vertical trajectory and destroying the stratified sampling logic (such as surface water mixing into bottom samples).

[0009] 2. Stratified sampling confusion and seal failure

[0010] Leakage of mechanical valves:

[0011] Stratified water samplers (such as the Rosette system) control the opening and closing of sampling bottles at different depths through solenoid valves. However, after the valve sealing surface is worn by sediment for a long time, the closing gap increases (> 0.1 mm), and the leakage rate in a high - pressure deep - water environment (> 30 m) can reach 5% - 10% (Journal of Ocean Technology, 2018), resulting in cross - contamination of adjacent layer water bodies.

[0012] Single - time sampling depth limitation:

[0013] Most devices need to be lowered multiple times to complete multi - depth sampling (such as triggering each layer separately), which increases the time consumption and exacerbates the cable wear (the cable friction loss rate for a single task increases by 30%).

[0014] 3. Operational complexity and manual reliance

[0015] Manual triggering is inefficient:

[0016] Some cheap water samplers (such as plexiglass bottles) rely on the impact of a gravity hammer to trigger, and the cable needs to be repeatedly retracted and released to adjust the depth. Sampling 10 layers at a single point takes >40 minutes, and the success rate is affected by the operator's experience (the error rate of novices is >15%).

[0017] High energy and maintenance costs:

[0018] Automated pump-suction samplers require a continuous power supply (such as a 100W pump). When relying on batteries in remote waters, their battery life is less than 8 hours. In addition, the filter is prone to clogging (maintenance is required twice a day on average), and the operation and maintenance costs are three times higher than traditional devices.

[0019] 4. Insufficient environmental adaptability of structural design

[0020] Weak resistance to flow rate:

[0021] When the flow rate of a conventional cylindrical sampling tube is >1.5m / s, a turbulent vortex is easily generated at the tail of the tube, disturbing the water body and sucking in suspended particles (such as mud), changing the original composition of the sample (the turbidity deviation can reach 20NTU).

[0022] Poor corrosion resistance of materials:

[0023] The average annual corrosion rate of aluminum alloy or ordinary stainless steel in seawater or acidic lakes (pH <5) is >0.2mm, which leads to failure of the sealing structure (such as corrosion and deformation of the O-ring groove) and shortened service life (<2 years). Summary of the invention

[0024] In view of the deficiencies in the prior art, the present invention provides a floating island water environment sampling device based on flow rate adaptation, which solves the above-mentioned problems.

[0025] To achieve the above objectives, the present invention is implemented through the following technical solutions: a floating island water environment sampling device based on flow rate adaptation, comprising a floating island with a built-in driving device, wherein the inner cavity of the floating island is respectively provided with a sampling mechanism for sampling water and a guiding mechanism for guiding the sampling mechanism;

[0026] The sampling mechanism includes a sampling barrel and a traction wheel rotatably arranged in the inner cavity of the floating island, the surface of the traction wheel is connected to a pull rope fixedly connected to the top of the sampling barrel, and the inner cavity of the floating island is provided with a receiving groove adapted to the sampling barrel;

[0027] The guide mechanism comprises a guide wheel rotatably arranged in the inner cavity of the floating island, the surface of the guide wheel is connected to a guide rope in a transmission manner, the bottom end of the guide rope is fixedly connected to a counterweight ball, and the center of the sampling tube is provided with a guide groove for the guide rope to pass through;

[0028] The inner cavity of the sampling cylinder is rotatably connected to the rotating cylinder through a rotating ring, and the rotating cylinder is driven by the driving structure of the inner cavity of the sampling cylinder. The inner cavity of the rotating cylinder is provided with a plurality of sampling grooves arranged in an array from top to bottom, and the surfaces of the plurality of sampling grooves are provided with connecting ports. The inner wall of the sampling cylinder is fixed with an annular sealing ring circumferentially sleeved on the surface of the rotating cylinder, and the plurality of annular sealing rings are respectively circumferentially arranged on the periphery of the guide groove and frictionally sealed with the surface of the rotating cylinder. The sampling cylinder and the annular sealing ring are both provided with a plurality of water inlet grooves, and the plurality of water inlet grooves are arranged on the surfaces of the plurality of sampling grooves in a one-to-one correspondence from top to bottom. When the sampling cylinder is in the initial position, the first water inlet groove is located at a distance of two water inlet groove widths on the right side of the connecting port, and the distance between the lower water inlet groove and the connecting port is increased by the width of two water inlet grooves in sequence. When in use, the floating island is driven to the point where sampling is required by the driving device, and then the floating island is positioned on the water surface and kept motionless, and then the guide rope is lowered by the guide wheel to lower the counterweight ball When it contacts the soil underwater, it determines whether it sinks to the bottom by detecting the tension data of the guide rope. The counterweight ball straightens the guide rope to guide the sampling tube, and then pulls the rope under the traction wheel. At this time, the sampling tube slides downward along the guide rope, and after entering the set depth, it stands still for twenty seconds, and then prepares for sampling. At this time, the rotating cylinder is driven to rotate left by a distance of two water inlet groove widths to drive the uppermost water inlet groove to connect with the connecting port. At this time, under the external water pressure, water enters the sampling groove for sampling, and then the rotating cylinder is driven to rotate left by a distance of two water inlet groove widths to close the uppermost sampling groove to complete sampling at one depth. During the rotation, when the elastic airbag rotates to the surface above the connecting port, the elastic airbag will be embedded in the connecting port due to squeezing to seal it, and then the sampling tube is driven to descend to the second sampling depth, and the above operation is repeated to sample the second sampling groove. Water at multiple depths can be sampled by rotating the rotating cylinder, and the sealing performance is good, which will not cause sampling confusion.

[0029] As a further solution of the present invention: the traction wheel is driven by a motor to retract and release the sampling tube, and two traction wheels are provided, which are symmetrically arranged above the accommodating groove to ensure the balance of the pulling force on the sampling tube.

[0030] As a further solution of the present invention: the inner wall of the guide groove abuts against the surface of the guide rope, and the guide rope is lowered by the guide wheel, and the counterweight ball is lowered underwater to contact the soil. At this time, the counterweight ball straightens the guide rope to guide the sampling tube. The sampling tube can only move up and down on the guide rope when it descends, which can ensure that the longitude and latitude coordinates remain unchanged when sampling.

[0031] As a further solution of the present invention: the sampling cylinder is in the shape of a hollow cylinder, and the arc on the surface can effectively reduce the influence caused by water flow and minimize the disturbance to the water layer. A hollow groove adapted to the guiding groove is provided in the inner cavity of the rotating cylinder.

[0032] As a further solution of the present invention: the driving mechanism includes a driven gear fixed on the surface of the rotating cylinder and a driving gear driven by a motor. The driving gear meshes with the driven gear. By driving the driving gear to rotate through the motor, the driven gear is driven to rotate, thereby driving the rotating cylinder to rotate in the inner cavity of the sampling cylinder.

[0033] As a further solution of the present invention: inner grooves communicating with the water inlet groove are provided on the surface of the sampling cylinder. Through the setting of the inner grooves, when it is necessary to take out the sampled water, only by rotating to align the water inlet groove with the communication port, the water in the sampling groove will automatically flow out along the inner grooves under the action of gravity for sampling.

[0034] As a further solution of the present invention: an elastic airbag sleeved on the surface of the sampling groove is slidably connected in the inner cavity of the annular sealing ring. When rotating, when the elastic airbag rotates above the surface of the communication port, at this time, due to extrusion, the elastic airbag will be embedded into the communication port for sealing. When the notch of the elastic airbag rotates to the surface of the communication port, it is communicated with the outside at this time for sampling or discharging the sampled water.

[0035] As a further solution of the present invention: the sampling cylinder is hermetically arranged to prevent water from entering between the rotating cylinder and the sampling cylinder.

[0036] The present invention has the following beneficial effects compared with the prior art:

[0037] 1. The present invention has high-precision positioning and anti-interference capabilities, with a floating island drive + guiding rope counterweight system: a driving device is built into the floating island to actively offset the drift caused by water flow / wind. Combined with a counterweight ball sinking to the bottom to straighten the guiding rope, it ensures that the sampling cylinder is lowered along a vertical trajectory, with a longitude and latitude offset ≤ 0.1 m. The guiding groove and hollow groove design: the guiding rope passes through the center of the sampling cylinder, restricting its lateral displacement, reducing the lateral impact of water flow on the sampling cylinder, and reducing the disturbance to the water layer. Stratified independent sampling and sealing guarantee, with a multi-groove stratified structure of the rotating cylinder: multiple independent sampling grooves are arranged in the rotating cylinder, and the corresponding relationship between the communication port and the water inlet groove is controlled by rotation to achieve single-time lowering and multi-depth sampling, avoiding the mixing of water samples. Elastic airbag dynamic sealing: when the rotating cylinder rotates, the elastic airbag is pressed and embedded into the communication port to form a flexible seal; when sampling, the notch of the airbag is aligned with the communication port to ensure smooth water flow. Redundant design of the annular sealing ring: multiple annular sealing rings are frictionally matched with the rotating cylinder, and even if a single ring is worn, the overall sealing performance can still be maintained to prevent external water from seeping in.

[0038] 2. By driving the rotating cylinder to rotate leftward by a distance equal to the width of two water inlet grooves, the uppermost water inlet groove is driven to communicate with the communication port. At this time, under the external water pressure, water enters the sampling tank for sampling. Then, drive the rotating cylinder to rotate leftward by a distance equal to the width of two water inlet grooves to close the uppermost sampling tank, completing the sampling at one depth. When rotating, when the elastic airbag rotates above the surface of the communication port, at this time, due to extrusion, the elastic airbag will be embedded inside the communication port for sealing. Then, drive the sampling cylinder to descend to the second sampling depth, and repeat the above operations to sample the second sampling tank. Water at multiple depths can be sampled by rotating the rotating cylinder, and the sealing performance is good, and sampling confusion will not occur.

[0039] 3. In the present invention, when rotating, when the elastic airbag rotates above the surface of the communication port, at this time, due to extrusion, the elastic airbag will be embedded inside the communication port for sealing. When the notch of the elastic airbag rotates to the surface of the communication port, it communicates with the outside at this time for sampling or discharging the sampled water.

[0040] 4. In the present invention, when it is necessary to take out the sampled water, just rotate to align the water inlet groove with the communication port, and the water in the sampling tank will automatically flow out along the inner groove under the action of gravity for sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a structural sectional view of the present invention;

[0042] Figure 2 is the present invention Figure 1 is a partial enlarged view of part A in;

[0043] Figure 3 is a schematic structural view of the sampling cylinder of the present invention;

[0044] Figure 4 is a schematic structural view of the rotating cylinder of the present invention;

[0045] Figure 5 is a schematic structural view of the working state of the present invention.

[0046] In the figure: 1. Floating island; 2. Guide wheel; 3. Guide rope; 4. Counterweight ball; 5. Sampling cylinder; 6. Rotating cylinder; 7. Rotating ring; 8. Guide groove; 9. Pulling rope; 10. Traction wheel; 11. Driven gear; 12. Driving gear; 13. Sampling tank; 14. Annular sealing ring; 15. Elastic airbag; 16. Water inlet groove; 17. Inner groove; 18. Communication port; 19. Accommodating groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manner, structure, characteristics, and effects of the present invention as follows.

[0048] See also Figures 1-5 , the present invention provides a technical solution: a floating island type water environment sampling device based on flow rate adaptation, comprising a floating island 1 with a built-in driving device, the inner cavity of the floating island 1 is respectively provided with a sampling mechanism for sampling water and a guiding mechanism for guiding the sampling mechanism;

[0049] The sampling mechanism includes a sampling tube 5 and a traction wheel 10 rotatably arranged in the inner cavity of the floating island 1. The surface of the traction wheel 10 is transmission-connected with a pull rope 9 fixedly connected to the top of the sampling tube 5. The inner cavity of the floating island 1 is provided with a receiving groove 19 adapted to the sampling tube 5.

[0050] The guide mechanism includes a guide wheel 2 rotatably arranged in the inner cavity of the floating island 1, the surface of the guide wheel 2 is connected to a guide rope 3, the bottom end of the guide rope 3 is fixedly connected to a weight ball 4, and the center of the sampling tube 5 is provided with a guide groove 8 for the guide rope 3 to pass through;

[0051] The inner cavity of the sampling cylinder 5 is rotatably connected with a rotating cylinder 6 through a rotating ring 7. The rotating cylinder 6 is driven by a driving structure in the inner cavity of the sampling cylinder 5. A plurality of sampling grooves 13 are arranged in an array from top to bottom in the inner cavity of the rotating cylinder 6. Communication ports 18 are arranged on the surfaces of the plurality of sampling grooves 13. An annular sealing ring 14 is fixed on the inner wall of the sampling cylinder 5 and is circumferentially sleeved on the surface of the rotating cylinder 6. The plurality of annular sealing rings 14 are respectively circumferentially arranged around the guide groove 8 and are friction-sealed with the surface of the rotating cylinder 6. A plurality of water inlet grooves 16 are arranged on both the sampling cylinder 5 and the annular sealing ring 14. The plurality of water inlet grooves 16 are arranged in one-to-one correspondence with the surfaces of the plurality of sampling grooves 13 from top to bottom. When the sampling cylinder 5 is in the initial position, the first water inlet groove 16 is located at a distance of two widths of the water inlet grooves 16 to the right of the communication port 18, and the distance between the lower water inlet grooves 16 and the communication port 18 increases by two widths of the water inlet grooves 16 in sequence. When in use, the floating island 1 is driven to the sampling point by a driving device, and then the floating island 1 is positioned on the water surface and kept stationary. Then, at this time, the guide rope 3 is lowered through the guide wheel 2, and the counterweight ball 4 is lowered underwater to contact the soil. Whether it has reached the bottom is judged by detecting the tension data of the guide rope 3. The counterweight ball 4 straightens the guide rope 3 and guides the sampling cylinder 5. Then, the pull rope 9 is pulled below the traction wheel 10. At this time, the sampling cylinder 5 slides down along the guide rope 3. After reaching the set depth, it is left static for twenty seconds, and then sampling is ready to be carried out. At this time, the rotating cylinder 6 is driven to rotate left by a distance of two widths of the water inlet grooves 16, driving the uppermost water inlet groove 16 to communicate with the communication port 18. At this time, under the external water pressure, water enters the sampling groove 13 for sampling. Then, the rotating cylinder 6 is driven to rotate left by a distance of two widths of the water inlet grooves 16 to close the uppermost sampling groove 13, completing the sampling at one depth. When rotating, when the elastic airbag 15 rotates above the surface of the communication port 18, at this time, due to extrusion, the elastic airbag 15 will be embedded into the communication port 18 for sealing. Then, the sampling cylinder 5 is driven to descend to the second sampling depth, and the above operation is repeated to sample the second sampling groove 13. Sampling of water at multiple depths can be carried out through the rotation of the rotating cylinder 6, and the sealing performance is good, and sampling confusion will not occur.

[0052] The traction wheel 10 is driven by a motor to take in and release the sampling cylinder 5, and there are two of them, symmetrically arranged above the receiving groove 19 to ensure the balance of the pulling force on the sampling cylinder 5.

[0053] The inner wall of the guide groove 8 abuts against the surface of the guide rope 3. The guide rope 3 is lowered through the guide wheel 2, and the counterweight ball 4 is lowered underwater to contact the soil. At this time, the counterweight ball 4 straightens the guide rope 3 and guides the sampling cylinder 5. The sampling cylinder 5 can only move up and down on the guide rope 3 when descending, which can ensure that the longitude and latitude coordinates remain unchanged during sampling.

[0054] The sampling cylinder 5 is in the shape of a hollow cylinder, and the arc on its surface can effectively reduce the influence caused by water flow and minimize the disturbance to the water layer. A hollow groove adapted to the guiding groove is provided in the inner cavity of the rotating cylinder 6.

[0055] The driving mechanism includes a driven gear 11 fixed on the surface of the rotating cylinder 6 and a driving gear 12 driven by a motor. The driving gear 12 meshes with the driven gear 11. By driving the driving gear 12 to rotate with the motor, the driven gear 11 is driven to rotate, thereby driving the rotating cylinder 6 to rotate in the inner cavity of the sampling cylinder 5.

[0056] Inner grooves 17 communicating with the water inlet groove 16 are provided on the surface of the sampling cylinder 5. Through the setting of the inner grooves 17, when it is necessary to take out the sampled water, just rotate to align the water inlet groove 16 with the communication port 18, and the water in the sampling groove 13 will automatically flow out along the inner grooves 17 under the action of gravity for sampling.

[0057] An elastic airbag 15 sleeved on the surface of the sampling groove 13 is slidably connected to the inner cavity of the annular sealing ring 14. When rotating, when the elastic airbag 15 rotates above the surface of the communication port 18, at this time, due to extrusion, the elastic airbag 15 will be embedded into the communication port 18 for sealing. When the notch of the elastic airbag 15 rotates to the surface of the communication port 18, it is communicated with the outside at this time for sampling or discharging the sampled water.

[0058] The sampling cylinder 5 is hermetically arranged to prevent water from entering between the rotating cylinder 6 and the sampling cylinder 5.

[0059] High-precision positioning and anti-interference ability

[0060] Floating island drive + guide rope counterweight system: The floating island is equipped with a built-in driving device that can actively offset the drift caused by water flow / wind. Combined with the counterweight ball 4 sinking to the bottom to straighten the guide rope 3, it ensures that the sampling cylinder 5 is lowered along a vertical trajectory, and the longitude and latitude deviation ≤ 0.1 m.

[0061] Guiding groove 8 and hollow groove design: The guide rope 3 passes through the center of the sampling cylinder, restricting its lateral displacement, reducing the lateral impact of water flow on the sampling cylinder, and reducing the disturbance of the water layer.

[0062] Stratified independent sampling and sealing guarantee

[0063] Multi-groove stratified structure of the rotating cylinder 6: Multiple independent sampling grooves 13 are provided in the rotating cylinder. By rotating to control the corresponding relationship between the communication port 18 and the water inlet groove 16, sampling at multiple depths such as at 0.5 m intervals can be achieved during a single lowering, avoiding the mixing of water samples.

[0064] Dynamic sealing of the elastic airbag 15: When the rotating cylinder rotates, the elastic airbag 15 is pressed and embedded into the communication port 18 to form a flexible seal; when sampling, the notch of the airbag is aligned with the communication port to ensure smooth water flow.

[0065] Redundant design of the annular sealing ring 14: Multiple annular sealing rings 14 are in frictional fit with the rotating cylinder. Even if a single ring wears out, the overall sealing performance can still be maintained to prevent external water from seeping in.

[0066] Adaptive flow rate and efficient operation

[0067] Low-resistance streamlined structure: The sampling cylinder 5 adopts a hollow cylinder + arc surface design to reduce the water flow resistance and adapt to the flow rate environment of 0.5 - 3 m / s.

[0068] Double-wheel balanced retraction and release of the traction wheel 10: The double traction wheels 10 symmetrically drive the pull rope 9 to balance the force when the sampling cylinder is lowered, and avoid tilting and jamming caused by unilateral tension.

[0069] Automated stratified triggering: The precise rotation step angle of the rotating cylinder 6 driven by the motor is determined by the width of the water inlet trough. Five to ten layers of sampling can be completed in a single lowering, and the efficiency is increased by more than 50%.

[0070] Convenience of sample recovery

[0071] Gravity sample discharge through the inner groove 17: After sampling, the rotating cylinder 6 rotates to align the water inlet trough 16 with the inner groove 17, and the sample automatically flows out under the action of gravity without a complex pump suction structure.

[0072] Modular sampling trough 13: Each sampling trough can be independently disassembled and cleaned to avoid cross-contamination and adapt to different detection requirements such as special analysis of microorganisms and heavy metals.

[0073] Enhanced environmental adaptability

[0074] Pressure resistance and corrosion resistance design: The sampling cylinder 5 and the rotating cylinder 6 are made of 316L stainless steel or titanium alloy, and can withstand the pressure within 50 m of water depth and corrosive water bodies such as seawater and acidic lakes.

[0075] Low-temperature compatibility: The elastic airbag 15 adopts silicone rubber + fluorocarbon coating and can maintain flexibility and sealing performance in the environment of -20°C to 60°C.

[0076] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or equivalent changes and modifications within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A floating island water environment sampling device based on flow rate adaptation, comprising a floating island (1) with a built-in driving device, characterized in that: The inner cavity of the floating island (1) is respectively provided with a sampling mechanism for sampling water and a guiding mechanism for guiding the sampling mechanism; The sampling mechanism comprises a sampling barrel (5) and a traction wheel (10) rotatably arranged in the inner cavity of the floating island (1), the surface of the traction wheel (10) is drivingly connected to a pull rope (9) fixedly connected to the top of the sampling barrel (5), and the inner cavity of the floating island (1) is provided with a receiving groove (19) adapted to the sampling barrel (5); The guide mechanism comprises a guide wheel (2) rotatably arranged in the inner cavity of the floating island (1); the surface of the guide wheel (2) is transmission-connected with a guide rope (3); the bottom end of the guide rope (3) is fixedly connected with a weighted ball (4); and a guide groove (8) for the guide rope (3) to pass through is provided at the center of the sampling tube (5); The inner cavity of the sampling cylinder (5) is rotatably connected to a rotating cylinder (6) via a rotating ring (7); the rotating cylinder (6) is driven by a driving structure of the inner cavity of the sampling cylinder (5); the inner cavity of the rotating cylinder (6) is provided with a plurality of sampling grooves (13) arranged in an array from top to bottom; the surfaces of the plurality of sampling grooves (13) are all provided with a connecting port (18); an annular sealing ring (14) annularly sleeved on the surface of the rotating cylinder (6) is fixed to the inner wall of the sampling cylinder (5); the plurality of annular sealing rings (14) are respectively annularly arranged in the guide groove (8) The sampling cylinder (5) and the annular sealing ring (14) are both provided with a plurality of water inlet grooves (16), and the plurality of water inlet grooves (16) are arranged one by one on the surfaces of the plurality of sampling grooves (13) from top to bottom. When the sampling cylinder (5) is in an initial position, the first water inlet groove (16) is located at a distance of the width of two water inlet grooves (16) on the right side of the connecting opening (18), and the distance between the lower water inlet groove (16) and the connecting opening (18) increases by the width of two water inlet grooves (16) in sequence.

2. The floating island water environment sampling device based on flow rate adaptation according to claim 1 is characterized in that: The traction wheel (10) is driven by a motor to retract and release the sampling tube (5), and two traction wheels (10) are provided, which are symmetrically arranged above the containing groove (19).

3. The floating island water environment sampling device based on flow rate adaptation according to claim 1 is characterized in that: The inner wall of the guide groove (8) abuts against the surface of the guide rope (3).

4. The floating island water environment sampling device based on flow rate adaptation according to claim 1 is characterized in that: The sampling tube (5) is in the shape of a hollow cylinder.

5. The floating island water environment sampling device based on flow rate adaptation according to claim 1 is characterized in that: The driving mechanism comprises a driven gear (11) fixed on the surface of the rotating cylinder (6) and a driving gear (12) driven by a motor, wherein the driving gear (12) meshes with the driven gear (11).

6. The floating island water environment sampling device based on flow rate adaptation according to claim 1 is characterized in that: The surface of the sampling tube (5) is provided with an inner groove (17) which is in communication with the water inlet groove (16).

7. The floating island water environment sampling device based on flow rate adaptation according to claim 1 is characterized in that: The inner cavity of the annular sealing ring (14) is slidably connected to an elastic air bag (15) sleeved on the surface of the sampling groove (13).

8. The floating island water environment sampling device based on flow rate adaptation according to claim 1 is characterized in that: The sampling tube (5) is sealed.

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