Layered sampling device for water pollution environment detection

Abstract

This invention discloses a stratified sampling device for water pollution environmental detection, comprising: a frame body; a shaft frame vertically fixed in the middle of the frame body; multiple guide vanes distributed circumferentially, each of which is vertically connected to the frame body; multiple liquid sampling units distributed circumferentially, each of which is vertically installed on the frame body; a sling connected to the upper end of the shaft frame, the other end of which is connected to an external winding device; and a flow guiding device installed on the frame body and located at the lower end of the shaft frame. In this invention, each liquid sampling unit sequentially samples water at different depths, and the resin adsorption unit mainly set in the liquid sampling unit can adsorb pollutants in the water sample. After sampling, the elution tank can deliver eluent into the flow chamber to achieve the elution effect on the adsorption column in the resin adsorption unit, resulting in high sample concentration and facilitating subsequent detection.

Description

Technical Field

[0001] This invention belongs to the technical field of water pollution area detection, specifically a stratified sampling device for water pollution environmental detection. Background Technology

[0002] Currently, water pollution is becoming increasingly complex, with a wide variety of pollutants (such as heavy metals, persistent organic pollutants, and endocrine disruptors) and uneven distribution across vertical depths. Conventional stratified sampling only collects 1-2 liters of water. For pollutants with extremely low concentrations in the water, the collected samples often cannot be measured in the laboratory because the concentration is below the instrument's detection limit. Furthermore, during transportation, target pollutants (especially organic matter and heavy metals) are easily adsorbed by container walls or lost due to microbial degradation or photodecomposition, leading to inaccurate test results that fail to reflect the true pollution status of the water body. Therefore, it is necessary to provide a stratified sampling device for water pollution environmental monitoring to address the problems mentioned in the background section. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: a stratified sampling device for water pollution environmental detection, comprising:

[0004] The main framework;

[0005] The shaft bracket is vertically fixed in the middle of the main frame body;

[0006] The air deflector is a plurality of circumferentially distributed air deflectors, each of which is vertically connected to the frame body;

[0007] The liquid collection units are multiple units distributed circumferentially, and each liquid collection unit is vertically mounted on the frame body;

[0008] A sling is attached to the upper end of the shaft frame, and the other end of the sling is connected to an external winding device;

[0009] A flow guiding device is installed on the main frame and located at the lower end of the shaft bracket.

[0010] Furthermore, preferably, an underwater depth sensor is mounted on the shaft bracket;

[0011] The cross-section of the guide vane is arc-shaped, and an adjustment shaft is vertically and rotatably mounted on the frame body. Both ends of the guide vane are fixed to the adjustment shaft.

[0012] Furthermore, preferably, the flow guiding device includes:

[0013] The valve seat has multiple flow channels inside, and each flow channel is connected to the liquid taking unit.

[0014] The valve shafts are multiple and circumferentially distributed, and each valve shaft is slidably connected to the valve seat;

[0015] A flow guide seat is fixed to the lower end face of the valve seat, and a flow guide cavity is provided inside the flow guide seat;

[0016] A branch pipe is provided corresponding to the flow guiding channel. One end of the branch pipe is sealed and connected to the flow guiding channel, and the other end is connected to the guide cavity.

[0017] Furthermore, as a preferred embodiment, the valve shaft is provided with a flow-stopping hole, and one end of the valve shaft is connected to a support spring, the other end of the support spring being connected to the inner wall of the valve seat;

[0018] A rotating shaft is vertically rotatably connected inside the shaft bracket. The lower end of the rotating shaft extends into and connects to the valve seat. A cam is fixed on the rotating shaft.

[0019] Furthermore, as a preferred embodiment, a peristaltic pump is installed below the flow guide seat, and a flow guide port is provided on the outer side wall of the peristaltic pump, with the discharge end of the peristaltic pump connected to the guide cavity.

[0020] Furthermore, preferably, the liquid extraction unit includes:

[0021] The sampling container is fixed to the main frame body;

[0022] An inlet pipe is connected to the upper side wall of the sampling tank, and a three-way valve is installed at the other end of the inlet pipe;

[0023] A flow guide tube, one end of which is connected to a three-way valve, and the other end of which is connected to the flow guide device;

[0024] The drain end sleeve is connected to the upper side wall of the sampling tank.

[0025] Furthermore, as a preferred embodiment, the sampling container is configured with a flow chamber and a liquid storage chamber at the top and bottom, respectively, and a resin adsorption unit is installed in the flow chamber;

[0026] Furthermore, an elution tank is installed on the main frame, the elution tank stores eluent, one end of the elution tank is connected to a spray pipe, and the other end of the spray pipe is connected to the three-way valve.

[0027] Furthermore, preferably, the resin adsorption unit includes:

[0028] The mounting plate is horizontally fixed inside the sampling container;

[0029] An adsorption column is fixed to the lower end face of the mounting plate. The surface of the adsorption column is distributed with multiple adsorption holes, and each adsorption hole is filled with adsorption resin.

[0030] A sliding plate is fixed to the lower end face of the adsorption column, and multiple vertically fixed support rods are connected to the sliding plate;

[0031] The breathing tube is vertically inserted into the middle of the adsorption column;

[0032] A breathing bag is installed inside the sampling container, and a liquid septum is fixed inside the sampling container. The breathing bag is located below the liquid septum, and one end of the breathing tube is connected to the breathing bag.

[0033] Furthermore, as a preferred embodiment, an overflow channel is provided on one side of the sampling vessel located in the flow chamber, and the overflow channel is sealed and connected to the drain end sleeve;

[0034] A lead screw is vertically rotatably connected to the side wall of the sampling container, and a axial pressure sleeve is threadedly slidably connected to the lead screw. A pressure block that contacts the outer wall of the breathing bag is fixed at the end of the axial pressure sleeve.

[0035] The sampling container is equipped with a sealing cover, and a built-in motor is installed inside the sealing cover. The output end of the built-in motor is connected to the lead screw.

[0036] The upper and lower ends of the support rod are slidably connected to the mounting plate and the liquid separator, respectively, and the lower end of the support rod is fixed with a shaft plate. A linkage frame is rotatably connected inside the sampling tank. A guide groove is opened at one end of the linkage frame, and a guide pin is vertically fixed on the outer wall of the axial pressure sleeve. The guide pin is slidably connected to the guide groove.

[0037] The other end of the linkage frame is vertically fixed with a sliding shaft, and a sliding groove is provided on the shaft plate, with the sliding shaft slidably connected to the sliding groove.

[0038] Furthermore, as a preferred embodiment, when the lead screw rotates and pushes the shaft pressure sleeve close to the breathing bag and squeezes it, the linkage frame deflects counterclockwise and uses the sliding action of the sliding shaft and the sliding groove to push the shaft plate to slide upward. The support rod on the shaft plate simultaneously pushes the slide plate to move upward, thereby forming a squeezing effect on the adsorption column.

[0039] The sampling container has a bypass channel, the upper end of which is connected to the flow chamber and the lower end of which is connected to the liquid storage chamber. A solenoid valve rod is installed in the bypass channel.

[0040] The liquid storage chamber is configured as a negative pressure chamber.

[0041] Compared with the prior art, the beneficial effects of the present invention are:

[0042] In this invention, multiple liquid sampling units are distributed on the main frame, each corresponding to water samples taken at different depths. A flow guiding device is located below the main frame, which uses a peristaltic pump to deliver the water sample into the corresponding liquid sampling unit. The resin adsorption unit, which is mainly set in the liquid sampling unit, can adsorb pollutants in the water sample. The peristaltic pump continuously pushes water through the resin adsorption unit at a high flow rate, so that the pollutants in the water can be concentrated and captured on the adsorption column. After sampling, the elution tank can deliver eluent into the flow chamber, thereby achieving the elution effect on the adsorption column in the resin adsorption unit. Then, the bypass channel above the liquid storage chamber is opened to collect the liquid using negative pressure, resulting in a high sample concentration for convenient subsequent detection. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0044] Figure 2 This is a schematic diagram of the internal structure of the flow guiding device in this invention;

[0045] Figure 3 This is a schematic diagram of the liquid extraction unit in this invention;

[0046] Figure 4 This is a schematic diagram of the internal structure of the sampling container in this invention;

[0047] Figure 5 This is a schematic diagram of the resin adsorption unit in this invention;

[0048] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point A in the middle;

[0049] In the diagram: 1. Main frame; 11. Shaft bracket; 12. Guide vane; 13. Adjusting shaft; 2. Liquid intake unit; 21. Inlet pipe; 22. Three-way valve; 23. Guide pipe; 24. Drain end sleeve; 25. Washing tank; 26. Spray pipe; 3. Guide device; 31. Valve seat; 32. Guide channel; 33. Valve shaft; 34. Guide seat; 35. Guide cavity; 36. Rotating shaft; 37. Cam; 38. Peristalsis Pump; 39. Flow port; 4. Sampling tank; 41. Flow chamber; 42. Liquid storage chamber; 5. Resin adsorption unit; 51. Mounting plate; 52. Adsorption column; 53. Slide plate; 54. Support rod; 55. Breathing tube; 56. Overflow channel; 57. Shaft plate; 58. Bypass channel; 6. Breathing bag; 61. Shaft pressure sleeve; 62. Pressure block; 63. Built-in motor; 64. Linkage frame; 65. Guide groove; 66. Sliding shaft. Detailed Implementation

[0050] Please see Figures 1-6 In this embodiment of the invention, a stratified sampling device for water pollution environmental detection includes:

[0051] Frame main body 1;

[0052] The shaft bracket 11 is vertically fixed in the middle of the frame body 1;

[0053] The air guide vanes 12 are multiple in number and are distributed in a circle. Each air guide vane 12 is vertically connected to the frame body 1.

[0054] The liquid collection unit 2 consists of multiple units distributed circumferentially, and each liquid collection unit 2 is vertically mounted on the frame body 1;

[0055] A sling is connected to the upper end of the shaft frame 11, and the other end of the sling is connected to an external winding device (not shown in the figure). Specifically, each liquid sampling unit 2 can collect samples from water at different depths, and multiple liquid sampling units 2 can be arranged in a clockwise or counterclockwise order according to the sampling depth. As the frame body 1 sinks in the water environment, each liquid sampling unit 2 opens to take samples in sequence.

[0056] The flow guiding device 3 is installed on the frame body 1 and located at the lower end of the shaft frame 11. The flow guiding device 3 is used to transport water to the liquid collection unit 2.

[0057] In this embodiment, an underwater depth sensor (not shown in the figure) is installed on the shaft frame 11, which can detect the sinking depth of the frame body 1 in the water.

[0058] The cross-section of the guide vane 12 is arc-shaped, and an adjustment shaft 13 is vertically and rotatably mounted on the frame body 1. Both ends of the guide vane 12 are fixed to the adjustment shaft 13. The adjustment shaft 13 is mainly used to adjust the installation angle of the guide vane 12 to maintain a relatively stable rotational motion of the frame body in the underwater environment. Specifically, during water sampling, the impact of the water flow pushes the guide vane 12 on the frame body 1 to achieve overall rotation of the frame body 1. In this way, the frame body 1 maintains a rotating state during water sampling, and the inlet on the guide device 3 can collect water from the corresponding depth in a 360-degree omnidirectional manner without the need for an additional underwater motor, simplifying the structure. In addition, in high-turbidity water bodies or lakes with algal blooms, suspended matter tends to accumulate in one direction. If the inlet is fixed, it is easily blocked by floating aquatic plants, plastic bags, or large flocculents. Therefore, with rotation, even if debris is attached, the shearing force generated by the rotation helps to dislodge it.

[0059] In a preferred embodiment, the flow guiding device 3 includes:

[0060] The valve seat 31 has multiple flow channels 32 inside, and each flow channel 32 is connected to the liquid taking unit 2.

[0061] There are multiple valve shafts 33 distributed circumferentially, and each valve shaft 33 is slidably connected within the valve seat 31;

[0062] A flow guide seat 34 is fixed to the lower end face of the valve seat 31, and a flow guide seat 34 is provided with a guide cavity 35.

[0063] The branch pipes are provided corresponding to the flow channel 32. One end of the branch pipe is sealed and connected to the flow channel 32, and the other end is connected to the guide cavity 35. In this way, the water in the guide cavity 35 can enter the corresponding flow channel 32 through each branch pipe.

[0064] In this embodiment, the valve shaft 33 is provided with a flow-blocking hole, and one end of the valve shaft 33 is connected to a support spring. The other end of the support spring is connected to the inner wall of the valve seat 31. The support spring can slide the flow-blocking hole of the valve shaft 33 and the flow-guiding channel 32 apart under the action of elastic force. At this time, the flow-guiding channel 32 is in a closed state.

[0065] A rotating shaft 36 is vertically rotatably connected inside the shaft bracket 11. The lower end of the rotating shaft 36 extends into and is connected to the valve seat 31. A cam 37 is fixed on the rotating shaft 36. When the cam 37 rotates, it can radially push the corresponding valve shaft 33 to slide, so that the intercepting hole on the valve shaft 33 can be connected to the guide channel 32, thereby opening the guide channel 32. Specifically, when the frame body 1 sinks in the water environment, the underwater depth sensor detects the sinking depth. When the specified depth is reached, the cam 37 is used to open the corresponding guide channel 32 so that the water can flow into the liquid collection unit 2 through the guide channel 32. As the frame body 1 sinks to the next depth position, the rotating shaft 36 rotates and the cam 37 pushes the next valve shaft 33 to slide, thereby opening the next guide channel 32 and realizing continuous water collection in the water environment.

[0066] In this embodiment, a peristaltic pump 38 is installed below the flow guide seat 34. A flow guide port 39 is provided on the outer side wall of the peristaltic pump 38. The flow guide port 39 can transport water into the peristaltic pump 38, and the discharge end of the peristaltic pump 38 is connected to the guide cavity 35. The peristaltic pump 38 can continuously send water into the liquid extraction unit 2 at a large flow rate.

[0067] In this embodiment, the liquid sampling unit 2 includes:

[0068] Sampling container 4 is fixed to the frame body 1;

[0069] The liquid inlet pipe 21 is connected to the upper side wall of the sampling tank 4, and a three-way valve 22 is installed at the other end of the liquid inlet pipe 21.

[0070] The guide pipe 23 has one end connected to the three-way valve 22 and the other end connected to the guide device 23;

[0071] The drain end sleeve 24 is connected to the upper side wall of the sampling tank 4. The flow guiding device 3 sends the water sample into the flow guiding pipe 23. The flow guiding pipe 23 is connected to the inlet pipe 21 through the three-way valve 22. The water sample can continuously enter the sampling tank 4 and then be discharged through the drain end sleeve 24 on the sampling tank 4, so as to realize the continuous flow collection of water samples.

[0072] In a preferred embodiment, the upper and lower parts of the sampling container 4 are respectively configured as a flow chamber 41 and a liquid storage chamber 42, and a resin adsorption unit 5 is installed in the flow chamber 41.

[0073] Furthermore, an elution tank 25 is installed on the main frame 1. The elution tank 25 stores eluent. One end of the elution tank 25 is connected to a rinsing pipe 26, and the other end of the rinsing pipe 26 is connected to the three-way valve 22. That is, as the water sample continuously flows into the sampling tank 4, the resin adsorption unit 5 continuously adsorbs the pollutants in the water sample. Then, the guide device 3 stops transporting water, and the three-way valve 22 connects the rinsing pipe 26 and the inlet pipe 21. The elution tank 25 transports eluent to the sampling tank 4, thereby eluting the pollutants in the resin adsorption unit 5. The eluted sample solution can be stored in the storage chamber 42.

[0074] In this embodiment, the resin adsorption unit 5 includes:

[0075] Mounting plate 51 is horizontally fixed inside the sampling container 4;

[0076] An adsorption column 52 is fixed to the lower end face of the mounting plate 51. The surface of the adsorption column is distributed with a plurality of adsorption holes, and each adsorption hole is filled with adsorption resin.

[0077] A sliding plate 53 is fixed to the lower end face of the adsorption column 52, and multiple vertically fixed support rods 54 are connected to the sliding plate 53.

[0078] The breathing tube 55 is vertically inserted into the middle of the adsorption column 52;

[0079] A breathing bag 6 is installed inside the sampling container 4, which is equipped with a liquid septum. The breathing bag 6 is located below the liquid septum, and one end of the breathing tube 55 is connected to the breathing bag 6. During the sampling process, the breathing bag 6 can continuously expand and contract. During this expansion and contraction, it can draw in or expel external water through the breathing tube 55. At this time, the water sample can flow radially towards the circumferential sidewall of the adsorption column 52, and the adsorption column 52 can fully adsorb pollutants in the water, significantly improving the adsorption effect of the adsorption column 52.

[0080] In this embodiment, an overflow channel 56 is provided on one side of the sampling tank 4 located in the flow chamber 41, and the overflow channel 56 is sealed and connected to the drain end sleeve 24.

[0081] A lead screw is vertically rotatably connected to the side wall of the sampling container 4, and a axial pressure sleeve 61 is threadedly slidably connected to the lead screw. A pressure block 62 that contacts the outer wall of the breathing bag 6 is fixed at the end of the axial pressure sleeve 61.

[0082] The sampling tank 4 is equipped with a sealing cover, and a built-in motor 63 is installed inside the sealing cover. The output end of the built-in motor 63 is connected to the lead screw. In this way, the built-in motor 63 can use the pressure block 62 to provide a squeezing effect on the breathing bag 6 under forward and reverse action, and the main body of the breathing bag 6 can automatically elastically recover after being squeezed. Therefore, during the sampling process, the flow guiding device 3 sends water into the sampling tank 4 at a large flow rate through the peristaltic pump 38. At this time, the breathing tube 55 in the adsorption column 52 can provide a breathing reciprocating suction action through the breathing bag 6, so that a large number of pollutants in the water can be fully adsorbed by the adsorption column 52.

[0083] The upper and lower ends of the support rod 54 are slidably connected to the mounting plate 51 and the liquid separator, respectively, and the lower end of the support rod 54 is fixed with a shaft plate 57. The sampling tank 4 is rotatably connected with a linkage frame 64. One end of the linkage frame 64 is provided with a guide groove 65, and the outer wall of the axial pressure sleeve 61 is vertically fixed with a guide pin. The guide pin is slidably connected with the guide groove 65.

[0084] The other end of the linkage frame 64 is vertically fixed with a sliding shaft 66, and a sliding groove is provided on the shaft plate 57. The sliding shaft 66 is slidably connected to the sliding groove.

[0085] As the lead screw rotates, it pushes the shaft pressure sleeve 61 closer to and compresses the breathing bag 6. Simultaneously, the linkage frame 64 deflects counterclockwise and, through the sliding action of the sliding shaft 66 and the sliding groove, pushes the shaft plate 57 upward. The support rod 54 on the shaft plate 57 simultaneously pushes the sliding plate 53 upward, thus creating a compression effect on the adsorption column 52. With this configuration, as the shaft pressure sleeve 61 gradually moves away from the breathing bag 6, the breathing bag 6 elastically recovers from its compressed state. At this point, it can draw in external water through the breathing tube 55, while the linkage frame 64 deflects clockwise, pushing the shaft plate 57 to... The downward pull effect causes the lower end of the adsorption column 52 to be elastically stretched under tension, and the adsorption pores on its surface are stretched and expanded so that water can enter the adsorption column 52 through the adsorption pores and be fully adsorbed by the adsorption resin. When the axial pressure sleeve 61 gradually approaches and squeezes the breathing bag 6, the linkage frame 64 deflects counterclockwise. During the upward movement of the slide plate 53, the adsorption column 52 is squeezed and deformed. At this time, the adsorption pores are compressed, and the pollutants in the water cannot be completely discharged through the adsorption pores of the adsorption column 52, thereby improving the pollutant retention effect and achieving forced blocking of pollutants flowing with the water.

[0086] The sampling container 4 has a bypass channel 58. The upper end of the bypass channel 58 is connected to the flow chamber 41, and the lower end is connected to the liquid storage chamber 42. A solenoid valve rod is installed in the bypass channel 58.

[0087] The liquid storage chamber 52 is configured as a negative pressure chamber structure. That is, after the eluent has completed the elution of the pollutants on the adsorption column 52, the solenoid valve rod can slide open, and the liquid storage chamber 52 uses negative pressure to draw and store the sample liquid.

[0088] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stratified sampling device for water pollution environmental detection, characterized in that, It includes: Framework main body (1); A shaft bracket (11) is vertically fixed in the middle of the frame body (1); The air guide vanes (12) are multiple in a circular distribution, and each air guide vane (12) is vertically connected to the frame body (1); The liquid collection unit (2) consists of multiple units distributed in a circle, and each liquid collection unit (2) is vertically mounted on the frame body (1); A sling is attached to the upper end of the shaft frame (11), and the other end of the sling is connected to an external winding device; The flow guiding device (3) is installed on the frame body (1) and located at the lower end of the shaft frame (11).

2. The stratified sampling device for water pollution environmental detection according to claim 1, characterized in that: An underwater depth sensor is mounted on the shaft frame (11); The cross-section of the guide vane (12) is arc-shaped, and an adjustment shaft (13) is vertically rotatably mounted on the frame body (1). Both ends of the guide vane (12) are fixed to the adjustment shaft (13).

3. The stratified sampling device for water pollution environmental detection according to claim 1, characterized in that, The flow guiding device (3) includes: The valve seat (31) has multiple flow channels (32) inside, and each of the flow channels (32) is connected to the liquid taking unit (2); The valve shafts (33) are multiple in a circular distribution, and each valve shaft (33) is slidably connected in the valve seat (31); A flow guide seat (34) is fixed to the lower end face of the valve seat (31), and a flow guide seat (34) is provided with a guide cavity (35). A branch pipe is provided corresponding to the flow channel (32). One end of the branch pipe is sealed and connected to the flow channel (32), and the other end is connected to the guide cavity (35).

4. A stratified sampling device for water pollution environmental detection according to claim 3, characterized in that: The valve shaft (33) is provided with a flow-stopping hole, and one end of the valve shaft (33) is connected to a support spring, and the other end of the support spring is connected to the inner wall of the valve seat (31). A rotating shaft (36) is vertically rotatably connected inside the shaft bracket (11). The lower end of the rotating shaft (36) extends into and is connected to the valve seat (31). A cam (37) is fixed on the rotating shaft (36).

5. A stratified sampling device for water pollution environmental detection according to claim 4, characterized in that: A peristaltic pump (38) is installed below the flow guide seat (34). The peristaltic pump (38) has a flow guide port (39) on its outer side wall, and the discharge end of the peristaltic pump (38) is connected to the guide cavity (35).

6. A stratified sampling device for water pollution environmental detection according to claim 1, characterized in that, The liquid collection unit (2) includes: The sampling container (4) is fixed to the frame body (1); The inlet pipe (21) is connected to the upper side wall of the sampling tank (4), and a three-way valve (22) is installed at the other end of the inlet pipe (21). The guide tube (23) is connected at one end to the three-way valve (22) and at the other end to the guide device (23); The drain end sleeve (24) is connected to the upper side wall of the sampling tank (4).

7. A stratified sampling device for water pollution environmental detection according to claim 6, characterized in that: The sampling container (4) is configured with a flow chamber (41) and a liquid storage chamber (42) at the top and bottom respectively. A resin adsorption unit (5) is installed in the flow chamber (41). Furthermore, an elution tank (25) is installed on the main frame (1), the elution tank (25) contains elution liquid, one end of the elution tank (25) is connected to a spray pipe (26), and the other end of the spray pipe (26) is connected to the three-way valve (22).

8. A stratified sampling device for water pollution environmental detection according to claim 7, characterized in that, The resin adsorption unit (5) includes: Mounting plate (51) is horizontally fixed inside the sampling container (4); An adsorption column (52) is fixed to the lower end face of the mounting plate (51). The surface of the adsorption column is distributed with a plurality of adsorption holes, and each adsorption hole is filled with adsorption resin. A sliding plate (53) is fixed to the lower end face of the adsorption column (52), and a plurality of vertically fixed support rods (54) are connected to the sliding plate (53). The breathing tube (55) is vertically inserted into the middle of the adsorption column (52); A breathing bag (6) is installed inside the sampling container (4). A liquid-separating plate is fixed inside the sampling container (4). The breathing bag (6) is located below the liquid-separating plate. One end of the breathing tube (55) is connected to the breathing bag (6).

9. A stratified sampling device for water pollution environmental detection according to claim 8, characterized in that: An overflow channel (56) is provided on one side of the sampling tank (4) located in the flow chamber (41), and the overflow channel (56) is sealed and connected to the drain end sleeve (24); A lead screw is vertically rotatably connected to the side wall of the sampling container (4), and a axial pressure sleeve (61) is threadedly slidably connected to the lead screw. A pressure block (62) that contacts the outer wall of the breathing bag (6) is fixed at the end of the axial pressure sleeve (61). The sampling container (4) is equipped with a sealing cover, and a built-in motor (63) is installed inside the sealing cover. The output end of the built-in motor (63) is connected to the lead screw. The upper and lower ends of the support rod (54) are slidably connected to the mounting plate (51) and the liquid separator, respectively, and the lower end of the support rod (54) is fixed with a shaft plate (57). The sampling tank (4) is rotatably connected with a linkage frame (64). One end of the linkage frame (64) is provided with a guide groove (65), and the outer wall of the axial pressure sleeve (61) is vertically fixed with a guide pin. The guide pin is slidably connected with the guide groove (65). The other end of the linkage frame (64) is vertically fixed with a sliding shaft (66), and a sliding groove is provided on the shaft plate (57). The sliding shaft (66) is slidably connected to the sliding groove.

10. A stratified sampling device for water pollution environmental detection according to claim 9, characterized in that: When the lead screw rotates and pushes the shaft pressure sleeve (61) close to the breathing bag (6) and squeezes it, the linkage frame (64) deflects counterclockwise and pushes the shaft plate (57) upward by the sliding action of the sliding shaft (66) and the sliding groove. The support rod (54) on the shaft plate (57) pushes the slide plate (53) upward at the same time, thereby forming a squeezing effect on the adsorption column (52). The sampling tank (4) is provided with a bypass channel (58). The upper end of the bypass channel (58) is connected to the flow chamber (41), and its lower end is connected to the liquid storage chamber (42). A solenoid valve rod is installed in the bypass channel (58). The liquid storage chamber (52) is configured as a negative pressure chamber structure.

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