A sampling device based on river ecological detection

Abstract

This invention relates to the field of river ecological monitoring technology and discloses a sampling device based on river ecological monitoring. The device includes a telescopic arm with a suspension rope mounted on its side. A first winding assembly for adjusting the rope length is provided at the end of the telescopic arm. A plumb bob is connected to the free end of the rope. The device also includes a sampling mechanism and an on / off adjustment mechanism. The sampling mechanism includes a water tank mounted on the suspension rope and above the plumb bob, with an adjustable distance between the water tank and the plumb bob. A water inlet is provided on the side wall of the water tank. The on / off adjustment mechanism is located on the water tank and used to adjust the on / off state of the water inlet. This invention, through the combination of an adjustable-distance water tank and a plumb bob, along with an automatic sensing mechanism based on buoyancy changes and a remotely mechanically controlled on / off adjustment mechanism, achieves convenient, accurate, and automated sampling of water at different depths in rivers.

Description

Technical Field

[0001] This invention relates to the field of river ecological monitoring technology, specifically a sampling device based on river ecological monitoring. Background Technology

[0002] Modern river ecological monitoring technology has undergone profound changes, evolving from an early stage relying on manual sampling and analysis of single physicochemical indicators to a three-dimensional and intelligent technological system integrating spatial remote sensing, automated sensor networks, artificial intelligence analysis, and aquatic ecological models. However, water sampling is an indispensable bridge connecting on-site perception with laboratory findings, real-time data with legal standards, and macroscopic trends with microscopic mechanisms. Even with the most advanced drones and sensor arrays, their essential function is "screening and early warning," while water sample analysis is "diagnosis and judgment."

[0003] Currently, conventional river water sampling still largely relies on manual handheld samplers operated from boats or along the riverbank, or simple fixed or single-point automated samplers. These devices and methods are typically limited to surface water sampling in near-shore areas, making it difficult to efficiently, accurately, and representatively obtain water samples from the main river channel, different water depths (especially the bottom layer and thermocline), and under specific hydrodynamic conditions (such as the mixing zone downstream of sewage outlets). Because river water often exhibits significant vertical stratification in terms of temperature, density, dissolved oxygen, and pollutant concentration, and horizontal compositional gradients due to flow velocity, bank effects, and pollution source distribution, samples obtained using existing sampling methods often lack spatial representativeness and fail to accurately reflect the three-dimensional spatial heterogeneity of the water's chemical and biological characteristics. This can lead to biases in subsequent laboratory analysis and overall water quality assessment. Therefore, improvements to existing sampling devices are necessary. Summary of the Invention

[0004] This invention provides a sampling device based on river ecological monitoring, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A sampling device based on river ecological monitoring includes a telescopic arm, a suspension rope mounted on the side of the telescopic arm, a first winding assembly for adjusting the length of the suspension rope at the end of the telescopic arm, a plumb bob connected to the free end of the suspension rope, and a sampling mechanism and an on / off adjustment mechanism.

[0007] The sampling mechanism includes a water tank, which is mounted on the suspension rope and located above the plumb bob. The distance between the water tank and the plumb bob is adjustable, and the side wall of the water tank is provided with a water inlet.

[0008] An on / off adjustment mechanism is provided on the water tank for adjusting the on / off state of the water inlet;

[0009] When the water tank is empty, the buoyancy it experiences is greater than its own weight; when the water tank is fully loaded with water, its own weight is greater than the buoyancy it experiences.

[0010] As a preferred embodiment of the present invention, a fixed sleeve is fixedly connected to the hoisting rope, and a buoy is hinged to the side of the fixed sleeve. The outer circumference of the buoy is provided with a plurality of height marking rings distributed along its axial direction.

[0011] As a preferred embodiment of the present invention, the water tank is provided with a relief cavity at one end near the plumb bob, a sliding plate is slidably connected to the middle of the relief cavity, a winding post for winding the hanging rope is provided at the middle of the sliding plate, a clamp head that is interference-fitted with the relief cavity is provided at the end of the winding post away from the sliding plate, and a retaining ring that restricts the movement of the sliding plate is provided inside the relief cavity.

[0012] As a preferred embodiment of the present invention, the first winding assembly includes a relief groove disposed on the telescopic arm, a first rotating shaft rotatably connected to the middle of the relief groove, a first winding roller for winding the suspension rope fixedly connected to the middle of the first rotating shaft, and a rotating handle disposed at the end of the first rotating shaft.

[0013] As a preferred embodiment of the present invention, the on / off adjustment mechanism includes a lifting piston slidably connected to the water tank. The side wall of the water tank is provided with an extension tube, and a guide post is slidably connected to the middle of the extension tube. One end of the guide post extending into the water tank is provided with a triangular apex block. The side of the triangular apex block near the center of the water tank is an inclined surface. A buffer spring is sleeved on the outside of the guide post to drive the triangular apex block to move toward the center of the water tank. A convex ring is provided on the outside of the lifting piston. When the lifting piston is below the triangular apex block, the lifting piston blocks the water inlet. When the lifting piston moves above the triangular apex block, the triangular apex block disengages from the water inlet, and the water inlet is in an open state.

[0014] As a preferred embodiment of the present invention, the middle part of the lifting piston is provided with a sliding rod extending to the outside of the water tank, the end of the sliding rod is connected to the end of the pulling rope, and the telescopic arm is provided with a second winding assembly for adjusting the length of the pulling rope.

[0015] As a preferred embodiment of the present invention, the second winding assembly includes a rotating rod rotatably connected to the side of the telescopic arm, a deflection frame fixedly connected to the end of the rotating rod, a second rotating shaft rotatably connected to the middle of the deflection frame, a second winding roller fixedly connected to the middle of the second rotating shaft, and the second winding roller winding the end of the pulling rope away from the sliding rod.

[0016] As a preferred embodiment of the present invention, a first gear is provided on both sides of the first rotating shaft, and a second gear is provided on both sides of the second rotating shaft to mesh with the first gear. After the first gear and the second gear mesh, the linear speeds of the first winding roller and the second winding roller are the same, and the pulling rope and the hanging rope are released or retracted synchronously.

[0017] As a preferred embodiment of the present invention, the deflection frame is provided with brackets on both sides, and the brackets are rotatably connected to a deflection plate that cooperates with the second gear. A tension spring is provided between the deflection plate and the deflection frame to drive the deflection plate to move away from the second gear. A sliding sleeve is provided in the middle of the deflection frame, and a T-rod that cooperates with the deflection plate is slidably connected to the sliding sleeve. When the T-rod moves along the sliding sleeve in a direction away from the second winding roller, the T-rod drives the deflection plate to move in the direction of the second gear.

[0018] As a preferred embodiment of the present invention, the hoisting rope and the pulling rope are respectively disposed on both sides of the telescopic arm, the telescopic arm is provided with a guide wheel for guiding the hoisting rope and a first guide ring for guiding the pulling rope, and the side of the water tank is provided with a second guide ring for guiding the hoisting rope.

[0019] The present invention has the following advantages:

[0020] By combining an adjustable-spacing water tank with a plumb bob, along with an automatic sensing mechanism based on buoyancy changes and a remotely controlled on / off adjustment mechanism, convenient, accurate, and automated sampling of water at different depths in rivers is achieved. This ingeniously designed and simple-to-operate device significantly improves the spatial representativeness and collection efficiency of water samples, providing reliable technical support for precise river ecological monitoring. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a sampling device based on river ecological monitoring.

[0023] Figure 2 This is a schematic diagram of the telescopic arm in a sampling device based on river ecological monitoring.

[0024] Figure 3 This is a schematic diagram of the structure of a sampling device based on river ecological monitoring when the first and second gears are meshing.

[0025] Figure 4 This is a schematic diagram of the structure of a sampling device based on river ecological monitoring after the first and second gears are separated.

[0026] Figure 5 This is a schematic diagram of the deflection frame in a sampling device based on river ecological monitoring.

[0027] Figure 6 This is a schematic diagram of the structure of a buoy in a sampling device based on river ecological monitoring.

[0028] Figure 7 This is a schematic diagram of the structure of a sampling device based on river ecological monitoring, in which a water tank and a plumb bob are combined.

[0029] Figure 8 This is a schematic diagram of the internal structure of a water storage tank in a sampling device based on river ecological monitoring.

[0030] Figure 9 for Figure 8 The front view.

[0031] Figure 10 This is a schematic diagram of the structure of a sampling device based on river ecological monitoring when the water inlet is open.

[0032] In the diagram: 1. Telescopic boom; 2. Suspension rope; 3. Plumb bob; 4. Sampling mechanism; 5. On / off adjustment mechanism; 6. First winding assembly; 7. Pull rope; 8. Guide wheel; 9. First guide ring; 10. Clearance groove; 11. First winding roller; 12. First rotating shaft; 13. Rotating handle; 14. Rotating rod; 15. First gear; 16. Deflection frame; 17. Second gear; 18. Second rotating shaft; 19. Second winding roller; 20. Fixing sleeve; 21. Buoy; 22. Height indicator 23. Water tank; 24. Water inlet; 25. Second guide ring; 26. Relief cavity; 27. Sliding plate; 28. Winding post; 29. ​​Clamp; 30. Retaining ring; 31. Second winding assembly; 32. Tension spring; 33. Lifting piston; 34. Sliding rod; 35. Extension tube; 36. Buffer spring; 37. Guide post; 38. Triangular top block; 39. Convex ring; 40. Drain outlet; 41. Plug; 42. Sliding sleeve; 43. T-rod; 44. Deflection plate; 45. Bracket. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In one embodiment, see Figure 1 , Figure 7 and Figure 8 A sampling device based on river ecological monitoring includes a telescopic arm 1, which is assembled from multiple relatively sliding rod sections and equipped with a locking device (not shown in the figure, such as bolts or pins) to fix it after it extends to the required length. This design gives the device excellent adaptability: when the river is narrow, the operator can directly hold the telescopic arm 1 and extend its end above the central area of ​​the river; when the river is wide, the telescopic arm 1 can be temporarily fixed to the side of a boat using clamps, and fixed-point sampling can be achieved over a large area by moving the boat. The telescopic arm 1 serves as the base of the entire device, providing support and a working platform for all other components.

[0035] A hoisting rope 2 is installed below the working end of the telescopic boom 1, and a first winding assembly 6 is installed at the left end of the telescopic boom 1. The upper end of the hoisting rope 2 is wound around the first winding assembly 6. A plumb bob 3 is connected to the free end of the hoisting rope 2 for rapid sinking after entering the water, providing guidance and touching the bottom as a depth reference. It also includes a sampling mechanism 4 and an on / off adjustment mechanism 5.

[0036] The sampling mechanism 4 is the core of this invention for achieving stratified sampling. It mainly includes a water tank 23, which is threaded onto the suspension rope 2 and positioned above the plumb bob 3. A water inlet hole 24 is provided on the upper part of the side wall of the water tank 23. To allow for flexible adjustment of the position of the water tank 23 on the suspension rope 2, its height above the plumb bob 3 is adjustable. A drain outlet 40 is provided on the lower side wall of the water tank 23, and a plug 41 is provided on the drain outlet 40. Water in the water tank 23 can be drained through the drain outlet 40. A sealing ring is provided on the outer ring of the plug 41, which, when inserted into the drain outlet 40, can block the drain outlet 40.

[0037] The on / off adjustment mechanism 5 is used to remotely control the opening and closing of the water inlet 24. When the water inlet 24 is open, external water can flow into the interior of the water storage tank 23 through the water inlet 24. When the water inlet 24 is closed, external water cannot enter through the water inlet 24, and the water storage tank 23 is in an unloaded state.

[0038] The materials and volume of the water tank 23 are specially designed to meet the following buoyancy conditions: when it is empty and the water inlet 24 is closed, the buoyancy force it experiences is greater than its own weight, and it tends to float; when it is filled with water and close to full load, its total weight will be greater than the buoyancy force it experiences, and it will tend to sink. This characteristic is the key to achieving automatic sensing and sampling.

[0039] In one instance of this embodiment, please refer to Figure 6A fixing sleeve 20 is also connected to the hoisting rope 2, and a buoy 21 is hinged to the outside of the fixing sleeve 20. The buoy 21 is rod-shaped, and its outer surface is coated with multiple brightly colored (such as fluorescent) height marking rings 22. The buoy 21 functions similarly to a fishing float, and its depth changes in the water can visually reflect whether the sinker 3 has touched the bottom and the status of the water tank 23.

[0040] In one instance of this embodiment, please refer to Figure 7 and Figure 8 The water tank 23 has a recessed cavity 26 at its bottom, with a sliding plate 27 slidably connected inside. A winding post 28 is vertically fixed to the lower surface of the sliding plate 27, and a locking head 29 is provided at the end of the winding post 28. The suspension rope 2 can be wound around the winding post 28 and locked by pushing the locking head 29 into the inner wall of the recessed cavity 26 to form an interference fit. A retaining ring 30 is also provided in the recessed cavity 26 to prevent the sliding plate 27 from slipping off accidentally. With this structure, the distance between the water tank 23 and the plumb bob 3 can be easily preset to correspond to different target sampling water depths.

[0041] In one instance of this embodiment, please refer to Figure 3 The first winding assembly 6 mainly includes a relief groove 10 formed on the telescopic arm 1, a first rotating shaft 12 rotatably connected in the relief groove 10, a first winding roller 11 fixedly connected to the first rotating shaft 12, and a rotating handle 13 connected to the end of the first rotating shaft 12. By rotating the rotating handle 13, the first winding roller 11 can be controlled to release or retract the suspension rope 2, thereby adjusting the lowering depth of the suspended object.

[0042] In one instance of this embodiment, please refer to Figure 7 , Figure 8 , Figure 9 and Figure 10The on / off adjustment mechanism 5 mainly includes a lifting piston 33 installed inside the water tank 23 and a second winding assembly 31 installed on the telescopic arm 1. A sealing ring is fitted around the outer ring of the lifting piston 33. Therefore, when the lifting piston 33 moves to the same height as the water inlet 24, the sealing ring blocks the water inlet 24, thus keeping the water tank 23 in a sealed state. An extension tube 35 extends outward from the right side wall of the water tank 23. A horizontally arranged guide post 37 is slidably connected to the middle of the extension tube 35. The left end of the guide post 37 extends into the interior of the water tank 23, and a triangular apex block 38 is fixedly connected to the left end of the guide post 37. The lower part of the triangular apex block 38 is inclined. A buffer spring 36 is fitted around the outside of the guide post 37. The buffer spring 36 drives the triangular apex block 38 to move to the left. A convex ring 39 is provided on the outer side of the upper surface of the lifting piston 33. When the lifting piston 33... When the piston moves to the position of blocking the water inlet 24, the convex ring 39 on it fits against the inclined surface of the triangular top block 38. At this time, under the friction of the sealing ring, the lifting piston 33 can temporarily maintain this height. However, when the lifting piston 33 moves upward, the convex ring 39 will contact the inclined surface of the triangular top block 38. At this time, the convex ring 39 pushes the triangular top block 38 to the right, causing the triangular top block 38 to retract into the interior of the extension tube 35. At this time, the lifting piston 33 can move to the top of the water tank 23. When the lifting piston 33 disengages from the triangular top block 38, the triangular top block 38 will move to the left again under the action of the buffer spring 36. At this time, the triangular top block 38 will block the lifting piston 33. At this time, the water inlet 24 of the water tank 23 remains open.

[0043] In one instance of this embodiment, please refer to Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8A sliding rod 34 is provided in the middle of the upper surface of the lifting piston 33. The middle part of the sliding rod 34 is slidably connected to the top of the water tank 23, and the upper end of the sliding rod 34 extends to the outside of the upper part of the water tank 23. At this time, the upper end of the sliding rod 34 is connected to the lower end of the pull rope 7. A second winding assembly 31 is provided on the upper left side of the telescopic arm 1. The second winding assembly 31 winds around the upper end of the pull rope 7, and the length of the pull rope 7 is controlled by the second winding assembly 31. The second winding assembly 31 includes a rotating rod 14 oriented front-to-back and rotatably connected to the telescopic arm 1. The end of the rotating rod 14 is rotatably connected to the lower end of a deflection frame 16. The deflection frame 16 is a U-shaped structure with its opening facing downwards. A second rotating shaft 18 oriented front-to-back is rotatably connected to the middle of the deflection frame 16. A second winding roller 19 for winding the pulling rope 7 is located in the middle of the second rotating shaft 18. Second gears 17 are located on the front and rear sides of the second rotating shaft 18, and first gears 15 are located on the front and rear sides of the first rotating shaft 12. In its natural state, the deflection frame 16 swings downwards under gravity, causing the second gears 17 and 15 to mesh. By setting an appropriate gear ratio, the linear speeds of the first winding roller 11 and the second winding roller 19 can be synchronized. This means that in the linked state, the pulling rope 7 will be wound and released synchronously when the lifting rope 2 is wound and released, ensuring that the relative length relationship between the two remains basically stable.

[0044] The deflection frame 16 has supports 45 on both sides, and deflection plates 44 are rotatably connected to the supports 45. A tension spring 32 connects the deflection plates 44 and the deflection frame 16, causing one end of the plate to tend to move away from the second gear 17. A sliding sleeve 42 is provided in the middle of the deflection frame 16, and a T-rod 43 is slidably connected inside it. When the operator holds the deflection frame 16 and the T-rod 43 at the same time, the two ends of the T-rod 43 will press the two deflection plates 44 to rotate, causing their free ends to press against the teeth of the second gear 17, thereby achieving forced locking and preventing the second winding roller 19 from rotating.

[0045] In one instance of this embodiment, please refer to Figure 2 To ensure smooth rope routing, a guide wheel 8 is installed below the telescopic arm 1, and a first guide ring 9 is installed above the telescopic arm 1. Each member of the telescopic arm 1 has a guide wheel 8 and a first guide ring 9 at its end. The pull rope 7 passes through the first guide ring 9, and the hoisting rope 2 passes through the guide wheel 8, so that the pull rope 7 and the hoisting rope 2 can be close to the side of the telescopic arm 1 when in operation. A second guide ring 25 is installed above the side wall of the water tank 23, and the hoisting rope 2 passes through the second guide ring 25, so that when the hoisting rope 2 is in a vertical state, the water tank 23 is also in a vertical state, which facilitates the entry of water from the river into the water tank 23.

[0046] This embodiment includes the following steps during implementation:

[0047] 1. Preparation Stage: Based on the sampling point location, position the end of the telescopic arm 1 above the target water surface using either handheld or boat-mounted methods. Adjust and lock the distance between the water tank 23 and the plumb bob 3 using the winding column 28, according to the target water depth. Check the connection status of the buoy 21, plumb bob 3, and water tank 23.

[0048] 2. Deployment and Positioning Stage: Slightly lift the deflection frame 16 to disengage the second gear 17 from the first gear 15, release a small section of the traction rope 7, and then loosen it to allow the gears to re-engage. At this time, the hoisting rope 2 is taut, and the traction rope 7 is slightly slack. Turn the rotating handle 13 to simultaneously release the hoisting rope 2 and the traction rope 7. The plumb bob 3, water tank 23, and buoy 21 enter the water in sequence. The plumb bob 3 touches the bottom first, and the buoy 21 stops descending after being partially submerged in the water; at this point, the rope release is stopped. Due to the buoyancy of the unloaded water tank 23, it floats at the preset water depth, the upper hoisting rope 2 is slack, and the water inlet 24 is closed due to the lifting piston 33.

[0049] 3. Sampling and Triggering Stage: The operator simultaneously grips the deflection frame 16 and T-bar 43 to lock the second winding roller 19, then quickly pulls the deflection frame 16 upwards. This action forcefully lifts the lifting piston 33 via the pull rope 7. Due to water resistance and the anchoring effect of the plumb bob 3, the water tank 23 itself does not immediately rise; the lifting piston 33 moves rapidly upwards relative to the water tank 23, passing the triangular apex 38 and reaching the upper limit of the top of the water tank 23. The triangular apex 38 resets under the action of the buffer spring 36, locking below the lifting piston 33. At this time, the lifting piston 33 disengages from the blockage of the water inlet 24, and river water begins to flow into the water tank 23 through the water inlet 24.

[0050] 4. Sampling Completion and Lifting Stage: As the water intake increases, the total weight of the water tank 23 gradually increases. When it exceeds its buoyancy, the water tank 23 begins to slowly sink. This sinking action causes the float 21 to sink into the water as well. The operator can determine that sampling is complete by observing that the float 21 has clearly sunk. Then, the handle 13 is rotated in the opposite direction to lift the water tank 23 out of the water via the hoisting rope 2. Since the lifting piston 33 is held at the top by the triangular top block 38, but because the water tank 23 is basically full at this time, its internal water pressure is balanced with the external pressure. Therefore, during the lifting process, a large amount of upper water will not rush in, effectively avoiding mixing and contamination of the sample during the lifting process.

[0051] 5. Post-sampling processing: After retrieving the water tank 23, open the drain port 40 at the bottom of the tank to transfer the obtained water sample into the sample container, thus completing a stratified sampling operation.

[0052] This invention provides a sampling device for river ecological monitoring. By combining an adjustable-spacing water tank 23 with a plumb bob 3, along with an automatic sensing mechanism based on buoyancy changes and a remotely controlled on / off adjustment mechanism 5, it achieves convenient, accurate, and automated sampling of water at different depths in rivers. The device has an ingenious structure and is simple to operate, greatly improving the spatial representativeness and collection efficiency of water samples, and providing reliable technical support for accurate river ecological monitoring.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A sampling device based on river ecological monitoring, comprising a telescopic arm, a suspension rope mounted on the side of the telescopic arm, and a first winding assembly for adjusting the length of the suspension rope at the end of the telescopic arm, characterized in that, The free end of the suspension rope is connected to a plumb bob, and it also includes a sampling mechanism and an on / off adjustment mechanism. The sampling mechanism includes a water tank, which is mounted on the suspension rope and located above the plumb bob. The distance between the water tank and the plumb bob is adjustable, and the side wall of the water tank is provided with a water inlet. An on / off adjustment mechanism is provided on the water tank for adjusting the on / off state of the water inlet; When the water tank is empty, the buoyancy it experiences is greater than its own weight; when the water tank is fully loaded with water, its own weight is greater than the buoyancy it experiences.

2. The sampling device based on river ecological monitoring according to claim 1, characterized in that, A fixed sleeve is fixedly connected to the hoisting rope, and a buoy is hinged to the side of the fixed sleeve. The outer circumference of the buoy is provided with multiple height marking rings distributed along its axial direction.

3. The sampling device based on river ecological monitoring according to claim 1, characterized in that, The water tank has a relief cavity at the end near the plumb bob. A sliding plate is slidably connected to the middle of the relief cavity. A winding post for winding the hanging rope is provided in the middle of the sliding plate. A clamp head that is interference-fitted with the relief cavity is provided at the end of the winding post away from the sliding plate. A retaining ring that restricts the movement of the sliding plate is provided inside the relief cavity.

4. A sampling device based on river ecological monitoring according to claim 1, characterized in that, The first winding assembly includes a relief groove disposed on the telescopic arm, a first rotating shaft rotatably connected to the middle of the relief groove, a first winding roller for winding the suspension rope fixedly connected to the middle of the first rotating shaft, and a rotating handle disposed at the end of the first rotating shaft.

5. A sampling device based on river ecological monitoring according to claim 1, characterized in that, The on / off adjustment mechanism includes a lifting piston slidably connected inside the water tank. The side wall of the water tank is provided with an extension tube, and a guide post is slidably connected to the middle of the extension tube. One end of the guide post that extends into the water tank is provided with a triangular apex. The side of the triangular apex near the center of the water tank is inclined. A buffer spring is sleeved on the outside of the guide post to drive the triangular apex towards the center of the water tank. A convex ring is provided on the outside of the lifting piston. When the lifting piston is below the triangular apex, the lifting piston blocks the water inlet. When the lifting piston moves above the triangular apex, the triangular apex disengages from the water inlet, and the water inlet is in the open state.

6. A sampling device based on river ecological monitoring according to claim 1, characterized in that, The lifting piston has a sliding rod extending to the outside of the water tank at its center. The end of the sliding rod is connected to the end of the pull rope. The telescopic arm is equipped with a second winding assembly for adjusting the length of the pull rope.

7. A sampling device based on river ecological monitoring according to claim 6, characterized in that, The second winding assembly includes a rotating rod rotatably connected to the side of the telescopic arm. A deflection frame is fixedly connected to the end of the rotating rod. A second rotating shaft is rotatably connected to the middle of the deflection frame. A second winding roller is fixedly connected to the middle of the second rotating shaft. The second winding roller winds the end of the traction rope away from the sliding rod.

8. A sampling device based on river ecological monitoring according to claims 4 and 7, characterized in that, The first rotating shaft is provided with a first gear on both sides, and the second rotating shaft is provided with a second gear on both sides that meshes with the first gear. After the first gear and the second gear mesh, the linear speed of the first winding roller and the second winding roller are the same, and the pulling rope and the hanging rope are released or retracted synchronously.

9. A sampling device based on river ecological monitoring according to claim 7, characterized in that, The deflection frame is provided with brackets on both sides, and the brackets are rotatably connected to a deflection plate that cooperates with the second gear. A tension spring is provided between the deflection plate and the deflection frame to drive the deflection plate to move away from the second gear. A sliding sleeve is provided in the middle of the deflection frame, and a T-rod that cooperates with the deflection plate is slidably connected to the sliding sleeve. When the T-rod moves along the sliding sleeve in a direction away from the second winding roller, the T-rod drives the deflection plate to move in the direction of the second gear.

10. A sampling device based on river ecological monitoring according to claim 1, characterized in that, The hoisting rope and the pulling rope are respectively arranged on both sides of the telescopic arm. The telescopic arm is provided with a guide wheel to guide the hoisting rope and a first guide ring to guide the pulling rope. The side of the water tank is provided with a second guide ring to guide the hoisting rope.

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