Water body sampling device for environment-friendly detection

Abstract

The invention provides a water body sampling device for environmental protection detection, and relates to the technical field of water pollution detection. The device comprises a first pipe, a telescopic device and a second pipe in the first pipe, the inner diameter of the second pipe is smaller than that of the first pipe, a first notch is formed by a pipe opening and the inner wall of the first pipe, and a spiral groove is formed in the surface of the second pipe. A first-stage mounting plate and a second-stage mounting plate which are detachably connected are arranged in the first pipe, and the first pipe is connected with a separable bottom plate through a grading sampling assembly. The telescopic device drives the first-stage mounting plate to ascend, and when the spiral bulge abuts against the spiral groove, the first-stage mounting plate rotates and is separated from the second-stage mounting plate, and the separable bottom plate moves downwards along the pipe direction to press a water sample into the collection bin. A second water inlet pipe is further arranged on the first pipe and used for water sample entering. The device realizes graded sampling of water bodies with different depths, prevents sample mixing, and is convenient to operate, low in manufacturing cost and suitable for popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of water pollution detection, and particularly to a water body sampling device for environmental protection detection. Background Art

[0002] Environmental protection detection refers to the regular or irregular detection and evaluation of the concentration, distribution and change trend of various pollutants (such as water bodies, air, soil, etc.) in the environment, so as to master the environmental quality status, timely discover and warn of environmental pollution problems, and provide a scientific basis for the formulation and implementation of environmental protection measures.

[0003] In environmental protection detection, physical sampling is a key step in obtaining environmental samples, which is directly related to the accuracy and reliability of detection data. Through physical sampling, the actual pollutant content in environmental media such as water bodies and soil can be obtained, providing basic data for subsequent analysis and evaluation.

[0004] However, in the prior art, water body sampling devices for environmental protection detection often have problems such as complex structures, cumbersome operations, and high manufacturing costs. Especially for scenarios that require hierarchical sampling, traditional devices often need to set up complex mechanisms such as multiple solenoid valves, which not only increase the failure rate of the device, but also increase the manufacturing cost and maintenance difficulty. In addition, these devices also have deficiencies in preventing the mixing of water body samples at different depths, affecting the accuracy of detection results.

[0005] Therefore, we propose a water body sampling device for environmental protection detection. Summary of the Invention

[0006] The purpose of the present invention is to provide a water body sampling device for environmental protection detection to solve the above deficiencies in the prior art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A water body sampling device for environmental protection detection, including a first pipe and a telescopic device provided on the first pipe, and the water body sampling device for environmental protection detection further includes:

[0008] A second pipe and a third pipe fixedly arranged in the first pipe, the inner diameter of the second pipe is smaller than the inner diameter of the first pipe, and a first notch is formed between the pipe orifice position of the second pipe and the inner wall surface of the first pipe. A spiral groove is provided on the surface of the second pipe near the first notch. A first collection chamber and a second collection chamber are provided on the outer surface of the first pipe, and the first collection chamber and the second collection chamber are respectively communicated with the first pipe through connecting pipelines;

[0009] A primary mounting plate and a secondary mounting plate are arranged in tube one and are detachably connected to each other. A detachable bottom plate is provided on both the primary mounting plate and the secondary mounting plate through a graded sampling assembly, and a spiral protrusion adapted to the spiral groove is also provided on the primary mounting plate. When the primary mounting plate is raised by the telescopic device until the spiral protrusion abuts against the spiral groove, the graded sampling assembly causes the secondary mounting plate to move upward along tube two away from the primary mounting plate, and at the same time causes the detachable bottom plate to move downward along tube one away from the secondary separation plate.

[0010] As a further description of the above technical solution: a second water inlet pipe is also provided on the tube one. When the first-level mounting plate is raised by the telescopic device, external water enters the tube one through the second water inlet pipe, and when the detachable bottom plate moves downward along the tube one, the sample entering the tube one is pressed into the collection chamber two through the connecting pipeline.

[0011] As a further description of the above technical solution: the diameter of the first-level mounting plate is larger than the diameter of the second-level mounting plate, the first-level mounting plate and the second-level mounting plate are both hollow structures, and the top edges form a protrusion inward, and a slot is provided on the protrusion. The outer surface of the second-level mounting plate fits with the protrusion, and the second-level mounting plate is also provided with a limit block that is slidably connected to the bottom of the protrusion and has the same size as the slot.

[0012] As a further description of the above technical solution: the graded sampling assembly includes a hollow threaded column arranged on the first-level mounting plate and the second-level mounting plate, and the outer thread of the hollow threaded column is provided with a contact plate connected to the detachable bottom plate, the contact plate is slidably arranged on the limiting slide rails on the first-level mounting plate and the second-level mounting plate, the detachable bottom plate at the bottom of the second-level mounting plate is provided with a plug-in column inserted into the hollow threaded column, and the inner wall of the hollow threaded column and the outer wall of the plug-in column are respectively provided with spiral lines and thread grooves that adapt to each other.

[0013] As a further description of the above technical solution: an L-shaped groove is opened on the inner side of the second tube at the position corresponding to the limit block, and the L-shaped groove is adapted to the size of the limit block.

[0014] As a further description of the above technical solution: a one-way valve structure is provided on both the connecting pipeline and the first water inlet pipe.

[0015] As a further description of the above technical solution: the height of the connecting pipeline connected to the collection chamber 2 and the interface position of tube 1 is flush with the height of the second water inlet pipe, and when the detachable bottom plate is lowered along the tube to the maximum stroke, the outer surface of the detachable bottom plate is against the second water inlet pipe and the interface position of tube 1.

[0016] As a further description of the above technical solution: a streamlined shell is also provided on the outer peripheral side of the tube 1.

[0017] In the above technical solution, a water body sampling device for environmental protection detection provided by the present invention has the following beneficial effects:

[0018] 1. Hierarchical sampling function: By setting structures such as pipe one, pipe two, the first-level mounting plate, and the second-level mounting plate, hierarchical sampling of water bodies at different depths is achieved, effectively preventing the mixing of water body samples at different depths and improving the accuracy of detection results.

[0019] 2. Convenient operation: Only by means of a telescopic device can the sample collection of water bodies at different depths be completed, without the need to set multiple solenoid valves, simplifying the operation process and reducing the operation difficulty.

[0020] 3. Low manufacturing cost: Compared with traditional multi-solenoid valve sampling devices, this device has a simple structure, fewer required driving parts, and a lower manufacturing cost, making it suitable for popularization and use. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the whole after removing the fluid housing provided by an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the whole provided by an embodiment of the present invention;

[0025] Figure 4 It is provided by an embodiment of the present invention Figure 3 An enlarged schematic diagram of part A;

[0026] Figure 5 It is a schematic diagram of the cross-section of the whole from another angle provided by an embodiment of the present invention;

[0027] Figure 6 [[ID=4l]]It is an exploded view of the hierarchical sampling component provided by an embodiment of the present invention; <-

[0028] Figure 7 It is a schematic diagram of the cross-sectional structure of pipe one and pipe two provided by an embodiment of the present invention.

[0029] Description of the reference numerals:

[0030] 1. Tube 1; 2. Telescopic device; 3. Primary mounting plate; 31. Detachable bottom plate; 32. Tube 2; 33. Spiral groove; 34. L-shaped groove; 35. Connecting column; 36. Limit block; 37. Secondary mounting plate; 38. Hollow threaded column; 39. Missing groove; 310. Contact plate; 311. Limiting slide rail; 312. Slot 1; 313. Tube 3; 314. Slot 2; 4. Streamlined shell; 7. Collection chamber 1; 8. Collection chamber 2; 9. Connecting pipeline; 10. First water inlet pipe; 11. Second water inlet pipe. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] See also Figures 1 - 7 The embodiment of the present invention provides a technical solution: a water sampling device for environmental testing, comprising a tube 1 and a telescopic device 2 provided on the tube 1. The telescopic device 2 is used to drive the structure in the tube 1 to move to form a negative pressure to collect water and perform environmental testing of the water. When sampling water, the tube 1 is connected to the tube 1 via a cable on a winch, and the tube 1 is placed into the water to be sampled. It should be noted that the telescopic device 2 can be a hydraulic telescopic rod or an electric telescopic rod, both of which are currently available and will not be described in detail here.

[0033] In order to achieve graded sampling and prevent the mixing of water bodies at different depths during sampling to affect the test results, the water sampling device for environmental testing also includes a second tube 32 fixedly arranged in the first tube 1. The inner diameter of the second tube 32 is smaller than that of the first tube 1, and a notch 1 312 is formed between the nozzle position of the second tube 32 and the inner wall surface of the first tube 1. A spiral groove 33 is provided on the surface of the second tube 32 near the notch 1 312. A collection chamber 1 7 and a collection chamber 2 8 are provided on the outer surface of the first tube 1, and the collection chamber 1 7 and the collection chamber 2 8 are respectively connected to the first tube 1 through a connecting pipe 9.

[0034] A third tube 313 is disposed within the second tube 32. The inner diameter of the third tube 313 is smaller than that of the second tube 32. A second notch 314 is formed between the opening of the third tube 313 and the inner wall of the second tube 32. The third tube 313 also has a spiral groove 33 disposed on its surface near the second notch 314.

[0035] Inside the pipe 1, a first mounting plate 3 and a second mounting plate 37 that are detachably connected to each other are provided. On both the first mounting plate 3 and the second mounting plate 37, a separable bottom plate 31 is provided through a hierarchical sampling assembly. Moreover, on the first mounting plate 3 and the second mounting plate 37, spiral protrusions adapted to the spiral grooves 33 are also provided. When the first mounting plate 3 is raised by the telescopic device 2 until the spiral protrusions abut against the spiral grooves 33, the second mounting plate 37 moves upward along the pipe 2 away from the first mounting plate 3 through the hierarchical sampling assembly, and at the same time, the separable bottom plate 31 moves downward along the pipe 1 away from the second separation plate.

[0036] When the first mounting plate 3 is moved upward by the telescopic device 2, the first mounting plate 3, the second mounting plate 37 thereon (including the hierarchical sampling assembly on the second mounting plate 37 as well), and the bottom separable bottom plate 31 together form a piston device. Thus, when the first mounting plate 3 moves upward, the pressure inside the pipe 1 will be changed, thereby pumping the water sample to be detected in the external water body into the pipe 1. When the spiral protrusions on the first mounting plate 3 abut against the spiral grooves 33, due to the mutual cooperation of the spiral protrusions and the spiral grooves 33, the first mounting plate 3 will rotate, causing the first mounting plate 3 to separate from the second mounting plate 37. And at the same time, the separable bottom plate 31 at the bottom of the first mounting plate 3 will also move downward along the pipe 1. At this time, the downward-moving separable bottom plate 31 serves as a piston alone, pressing the sample that has entered the pipe 1 into the collection bin 2 through the connecting pipeline 9, and emptying the pipe 1 at this time. When the pipe 1 is pulled up or lowered to the water body at other depths by the winch and then water sampling is carried out again, after the water body enters the pipe 1, it will not be mixed with the previously remaining sample, preventing the cross-mixing of samples of water bodies at different depths and affecting the subsequent detection task.

[0037] A second water inlet pipe 11 is also provided on the pipe 1. When the first mounting plate 3 is raised by the telescopic device 2, the external water body enters the pipe 1 through the second water inlet pipe 11. And when the separable bottom plate 31 moves downward along the pipe 1, the sample that has entered the pipe 1 is pressed into the collection bin 2 through the connecting pipeline 9. Moreover, a first water inlet pipe 10 communicating with the pipe 1 and the pipe 2 is also provided on the pipe 1.

[0038] In summary, when conducting water sampling, the specific process is as follows: First, the sampling device is placed at a certain depth in the water body through a winch and a cable. Then, the telescopic device 2 is remotely activated, causing the telescopic device 2 to pull the secondary mounting plate 37 and the primary mounting plate 3 upward in the first pipe 1. At this time, the piston device composed of the primary mounting plate 3, the secondary mounting plate 37 thereon (including the hierarchical sampling components on the secondary mounting plate 37 as well), and the separable bottom plate 31 at the bottom moves upward as a whole. The water sample from the outside is pumped into the first pipe 1 through the second water inlet pipe 11 until the spiral protrusion on the primary mounting plate 3 is docked with the spiral groove 33 at the position of the notch 312. At this time, due to the cooperation of the spiral protrusion and the spiral groove 33, the primary mounting plate 3 rotates, realizing the separation from the secondary mounting plate 37. At the same time, with the drive of the telescopic device 2, the secondary mounting plate 37 moves upward along the second pipe 32, while the separable bottom plate 31 on the primary mounting plate 3 moves downward along the first pipe 1. The downward-moving separable bottom plate 31 presses the sample in the first pipe 1 into the second collection chamber 8 through the connecting pipeline 9. At this time, the sample in the first pipe 1 is collected by the second collection chamber 8;

[0039] At this time, the telescopic device 2 is turned off, and the first pipe 1 is moved to the water body at other depths through the winch and the cable. Then, the telescopic device 2 is restarted, causing the secondary mounting plate 37 to continue to rise. At this time, the sample of the water body at this depth is pumped into the first pipe 1 again through the first water inlet pipe 10 until the spiral protrusion on the secondary mounting plate 37 abuts against the spiral groove 33 at the position of the second notch. At this time, the separable bottom plate 31 on the secondary mounting plate 37 moves downward. The separable bottom plate 31 once again acts as a piston-like structure, pressing the sample in the first pipe 1 into the first collection chamber 7 through another connecting pipeline 9. At this time, the sample of the water body at another depth is collected by the second collection chamber 8. By setting one telescopic device 2, the sampling of water samples at different depths can be completed without setting multiple solenoid valves, solving the problem that solenoid valves are easily damaged in the water body. And only the start and stop of one telescopic device 2 need to be controlled externally. The overall operation is convenient, and the manufacturing cost is relatively low. Only one telescopic device 2 is required for the driving part, which is suitable for popularization and use;

[0040] In an embodiment of the present invention, in order to enable the first mounting plate 3 or the second mounting plate 37 to rotate when the spiral protrusions thereon abut against the spiral grooves 33 at the positions of groove one and groove two, the diameter of the first mounting plate 3 is larger than that of the second mounting plate 37. Both the first mounting plate 3 and the second mounting plate 37 are of a hollow structure, and the top edge forms a protrusion inward. A notch 39 is provided on the protrusion. The outer surface of the second mounting plate 37 is attached to the protrusion, and a limiting block 36 which is slidably connected to the bottom of the protrusion and has the same size as the notch 39 is further provided on the second mounting plate 37. The initial position of the limiting block 36 is set away from the notch 39. When the first mounting plate 3 and the second mounting plate 37 are lifted by the telescopic device 2, the limiting block 36 on the second mounting plate 37 abuts against the bottom of the protrusion position of the first mounting plate 3, thereby pulling the first mounting plate 3 to rise synchronously. When the spiral protrusion on the first mounting plate 3 abuts against the spiral groove 33, the first mounting plate 3 rotates until its notch 39 corresponds to the limiting block 36. The second mounting plate 37 separates from the first mounting plate 3 and moves upward into the second pipe 32, while the detachable bottom plate 31 on the first mounting plate 3 moves downward to press the sample in the first pipe 1 into the second collection bin 8. At this time, the telescopic device 2 can be closed. After moving the sampling device to water bodies at other depths, the telescopic device 2 is started again. At this time, the second mounting plate 37 moves upward to cross the interface position of the first water inlet pipe 10 and the second pipe 32. During the subsequent upward movement, the external water body is pumped into the first pipe 1 through the first water inlet pipe 10. Using one telescopic device 2 can complete multiple steps of pumping the water body sample, pressing the sample into the second collection bin 8, pumping the water body again, and pressing the sample into the first collection bin 7. The operation is simple and convenient, and the water body samples at each depth will not be mixed with each other, and the collection effect is better;

[0041] In another embodiment of the present invention, the graded sampling assembly includes a hollow threaded column 38 provided on the primary mounting plate 3 and the secondary mounting plate 37, and the outer thread of the hollow threaded column 38 is provided with a contact plate 310 connected to the detachable bottom plate 31, and the contact plate 310 is slidably provided on the limiting slide rails 311 on the primary mounting plate 3 and the secondary mounting plate 37. The detachable bottom plate 31 at the bottom of the secondary mounting plate 37 is provided with a plug-in column 35 plugged into the hollow threaded column 38, and the inner wall of the hollow threaded column 38 and the outer wall of the plug-in column 35 are respectively provided with spiral lines and thread grooves that adapt to each other, and the first mounting plate 3 and the groove are connected. When the ends of the first and second mounting plates 312 abut against each other and stop moving, and the second mounting plate 37 continues to move upward under the pulling of the telescopic device 2, the detachable bottom plate 31 at the bottom of the second mounting plate 37 will pull the plug-in post 35 upward, and the plug-in post 35 gradually moves away from the hollow threaded post 38. The spiral line and the thread groove inside the plug-in post 35 cooperate with each other to rotate the hollow threaded post 38, thereby causing the external contact plate 310 to move downward outside the hollow threaded post 38, so that the detachable bottom plate 31 moves downward while the second mounting plate 37 (and the graded sampling assembly thereon and the detachable bottom plate 31 at the bottom) moves upward.

[0042] When the secondary mounting plate 37 moves upward, in order to prevent the limit block 36 on the secondary mounting plate 37 from causing movement limitation, an L-shaped groove 34 is opened on the inner side of the second tube 32 at the position corresponding to the limit block 36, and the L-shaped groove 34 is adapted to the size of the limit block 36. When the secondary mounting plate 37 is separated from the primary mounting plate 3, the limit block 36 on it will be embedded in the L-shaped groove 34. When the spiral protrusion on the secondary mounting plate 37 and the spiral groove 33 on the second notch 314 abut and cooperate with each other, when the secondary mounting plate 37 rotates, the limit block 36 on it rotates synchronously until it is embedded in the short side of the L-shaped groove 34, preventing movement limitation.

[0043] To prevent the water in the second collection chamber 8, which already contains samples, from being drawn into it when the secondary mounting plate 37 ascends along the second pipe 32, and to prevent the samples from being discharged through the first water inlet pipe 10 again when the detachable bottom plate 31 is pressed downward, both the connecting pipe 9 and the first water inlet pipe 10 are provided with one-way valve structures. The first water inlet pipe 10 can only allow water to flow into the first pipe 1, while the connecting pipe 9 can only discharge the water sample in the first pipe 1 into the second collection chamber 8 or the first collection chamber 7, and cannot flow in the reverse direction.

[0044] It should also be noted that the height of the connection pipeline 9 connected to the second collection bin 8 at the interface position with the first pipe 1 is flush with the height of the second water inlet pipe 11. Similarly, the height of the interface position of the connection pipeline 9 connected to the first collection bin 7 should also be flush with the height of the first water inlet pipe 10. In this way, during the first water body collection, the water body sample enters the first pipe 1 through the second water inlet pipe 11. Since the water will sink under the action of gravity after entering the first pipe 1 and is at the bottom of the first pipe 1, and then the water body sample is pressed into the second collection bin 8 during the pressing process of the separable bottom plate 31. And when the separable bottom plate 31 descends along the first pipe 1 to the maximum stroke, that is, when the insertion column 35 is completely separated from the hollow threaded column 38, at this time the separable part no longer moves. At this time, the outer surface of the separable bottom plate 31 abuts against the interface positions of the second water inlet pipe 11 and the first pipe 1. In this way, the water body sample entering the first pipe 1 can be pressed into the second collection bin 8 to the greatest extent, and the second water inlet pipe 11 can be blocked to prevent the second water inlet pipe 11 from admitting water during the second water body collection. In this way, even if there is a water body sample from the first collection that fails to enter the second collection bin 8, this water body sample is at the bottom of the separable bottom plate 31. During the second collection, the water body sample enters from the first water inlet pipe 10 and also sinks under the action of gravity. At this time, the separable bottom plate 31 that abuts against the interface position of the second water inlet pipe 11 forms the bottom surface of the first pipe 1. The water body sample collected for the second time can only be above the separable bottom plate 31 and cannot contact the water body sample collected for the first time below, preventing the cross-mixing of the water body samples and avoiding abnormal situations in subsequent detections.

[0045] During the second water body sample collection, when the separable bottom plate 31 on the secondary mounting plate 37 descends, in order to smoothly press the solid sample into the first collection bin 7, the height of the interface position of the connection pipeline 9 connected to the first collection bin 7 with the first pipe 1 should be higher than the height of the separable bottom plate 31 below.

[0046] It should also be noted that in order to reduce the disturbance to the water body when the sampling device moves in the water, a streamlined outer shell 4 is also provided on the outer peripheral side of the first pipe 1.

[0047] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. An environmental protection detection water sampling device, comprising a first pipe (1) and a telescopic device (2) arranged on the first pipe (1), characterized in that, The environmental protection detection water sampling device also includes: A second tube (32) is fixedly arranged in the first tube (1), the inner diameter of the second tube (32) is smaller than the inner diameter of the first tube (1), and a notch (312) is formed between the tube mouth of the second tube (32) and the inner wall surface of the first tube (1), a spiral groove (33) is provided on the surface of the second tube (32) near the notch (312), and a collection chamber (7) and a collection chamber (8) are provided on the outer surface of the first tube (1), and the collection chamber (7) and the collection chamber (8) are respectively connected to the first tube (1) through a connecting pipe (9); A primary mounting plate (3) and a secondary mounting plate (37) are arranged in the first tube (1) and are detachably connected to each other. A detachable bottom plate (31) is provided on each of the primary mounting plate (3) and the secondary mounting plate (37) through a graded sampling assembly. A spiral protrusion adapted to the spiral groove (33) is also provided on the primary mounting plate (3). When the primary mounting plate (3) is raised by the telescopic device (2) until the spiral protrusion abuts against the spiral groove (33), the graded sampling assembly causes the secondary mounting plate (37) to move upwardly away from the primary mounting plate (3) along the second tube (32), and simultaneously causes the detachable bottom plate (31) to move downwardly away from the secondary separation plate along the first tube (1).

2. The water body sampling device for environmental protection detection according to claim 1, characterized in that, The tube one (1) is also provided with a second water inlet pipe (11). When the first-level mounting plate (3) is raised by the telescopic device (2), external water enters the tube one (1) through the second water inlet pipe (11), and when the detachable bottom plate (31) moves downward along the tube one (1), the sample entering the tube one (1) is pressed into the collection chamber two (8) through the connecting pipe (9).

3. The water body sampling device for environmental protection detection according to claim 2, wherein, The diameter of the primary mounting plate (3) is larger than the diameter of the secondary mounting plate (37). Both the primary mounting plate (3) and the secondary mounting plate (37) are hollow structures, and the top edges form a protrusion inward, and a notch (39) is provided on the protrusion. The outer surface of the secondary mounting plate (37) is in contact with the protrusion, and the secondary mounting plate (37) is also provided with a limit block (36) that is slidably connected to the bottom of the protrusion and has the same size as the notch (39).

4. An aquatic sampling device for environmental protection detection according to claim 3, characterized in that, The graded sampling assembly comprises a hollow threaded column (38) arranged on a primary mounting plate (3) and a secondary mounting plate (37), and an outer thread of the hollow threaded column (38) is provided with a contact plate (310) connected to a detachable bottom plate (31), the contact plate (310) is slidably arranged on a limiting slide rail (311) on the primary mounting plate (3) and the secondary mounting plate (37), the detachable bottom plate (31) at the bottom of the secondary mounting plate (37) is provided with a plug-in column (35) plugged into the hollow threaded column (38), and the inner wall of the hollow threaded column (38) and the outer wall of the plug-in column (35) are respectively provided with a spiral line and a thread groove that adapt to each other.

5. The water body sampling device for environmental protection detection according to claim 4, characterized in that, An L-shaped groove (34) is provided on the inner side of the second tube (32) at a position corresponding to the limit block (36), and the size of the L-shaped groove (34) is adapted to that of the limit block (36).

6. An aquatic sampling device for environmental protection detection according to claim 5, characterized in that, Both the connecting pipeline (9) and the first water inlet pipe (10) are provided with a one-way valve structure.

7. An aquatic sampling device for environmental protection detection according to claim 6, characterized in that, The height of the connection position between the connection pipeline (9) connected to the second collection bin (8) and the first pipe (1) is flush with the height where the second water inlet pipe (11) is located, and when the separable bottom plate (31) descends along the first pipe (1) to the maximum stroke, the outer surface of the separable bottom plate (31) abuts against the connection position between the second water inlet pipe (11) and the first pipe (1).

8. An aquatic sampling device for environmental protection detection according to claim 7, characterized in that, A streamlined housing (4) is further provided on the outer peripheral side of the first pipe (1).

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