Layered sampling device

Abstract

The utility model discloses a stratified sampling device, which comprises a collection unit, a collection assembly, a mounting assembly arranged at one end of the collection assembly, and a drainage assembly arranged at the other end of the collection assembly, the sampling unit comprises a first-layer sampling assembly which is arranged at the top of the collecting unit and is close to the drainage assembly, and a second-layer sampling assembly which is arranged at the top of the collecting unit and is positioned between the mounting assembly and the drainage assembly; the third-layer sampling assembly is arranged at the top of the collecting unit and is close to the mounting assembly. The device has the beneficial effects that by arranging the wastewater collection area, centralized collection is carried out before unified discharge, so that pollution to the environment caused by direct discharge of wastewater is effectively avoided, and convenience is provided for a subsequent sampling process; in the wastewater collection area, through layered sampling at different depths, accurate analysis of wastewater components is facilitated, data support is provided for formulating targeted treatment measures, and the distribution condition of pollutants in wastewater can be more comprehensively known in the subsequent analysis process.

Description

Technical Field

[0001] This invention relates to the field of sampling devices, and in particular to a stratified sampling device. Background Technology

[0002] With the development of industrial production, the discharge of industrial wastewater is increasing. Industrial wastewater generally involves various fields such as construction, energy, and petrochemicals. A common pollutant in industrial wastewater is a mixture of water and oil; the composition of this mixture is unclear, and it may also contain small amounts of sediment. Direct discharge into ditches or rivers will pollute rivers and damage the environment.

[0003] Therefore, collecting and sampling wastewater before discharge is crucial. However, due to the opaque nature of wastewater discharge pipelines, manual sampling can lead to significant errors in judging different depths of wastewater in the collection area, potentially resulting in inaccurate sampling at different depths and an inability to analyze the main components of the wastewater. This invention allows for fixed-location sampling of wastewater at different depths in the collection area before centralized discharge, greatly reducing errors from human judgment and significantly increasing the efficiency of subsequent wastewater component analysis. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above or prior art, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a stratified sampling device that collects samples in a centralized manner before wastewater discharge. By setting up sampling components at different depths, it can accurately sample water quality at different depths, which helps to more comprehensively understand the distribution of pollutants in wastewater before unified treatment and discharge.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a layered sampling device, comprising a collection unit including a collection component, an installation component disposed at one end of the collection component, and a drainage component disposed at the other end of the collection component; and a sampling unit including a first layer sampling component disposed on the top of the collection unit and close to the drainage component, a second layer sampling component disposed on the top of the collection unit and located between the installation component and the drainage component, and a third layer sampling component disposed on the top of the collection unit and close to the installation component.

[0008] In a preferred embodiment of the stratified sampling device of the present invention, the collection component includes a collection pipe and an exhaust port disposed at the top of the collection pipe; the mounting component includes a mounting flange disposed at the other end of the collection pipe; and the drainage component includes a drainage pipe disposed at one end of the collection pipe and a control water valve disposed on the drainage pipe.

[0009] As a preferred embodiment of the stratified sampling device of the present invention, the first stratified sampling component includes a first stratified sampling bucket fixedly connected to the collection pipe, a first stratified limiting groove symmetrically arranged at the top of the first stratified sampling bucket, a first stratified sampling limiting surface arranged at the lower end of the first stratified limiting groove, a first stratified filter screen arranged at the bottom of the first stratified sampling bucket, a first stratified sampling column slidably engaged with the inner wall of the first stratified sampling bucket, a set of first stratified limiting points arranged at the top of the first stratified sampling column, and a first stratified sealing plate arranged at the bottom of the first stratified sampling column.

[0010] In a preferred embodiment of the stratified sampling device of the present invention, the second-layer sampling component includes a second-layer sampling bucket fixedly connected to the collection pipe, and a second-layer filter screen disposed at the bottom of the second-layer sampling bucket.

[0011] In a preferred embodiment of the stratified sampling device of the present invention, the third-layer sampling component includes a third-layer sampling bucket fixedly connected to the collection pipe, a first limiting groove and a second limiting groove disposed on the inner wall of the third-layer sampling bucket, a first sliding groove disposed in the middle of the first limiting groove and the second limiting groove, a second sliding groove disposed at the lower part of the second limiting groove, a first filtering area disposed at the bottom of the third-layer sampling bucket, a second filtering area disposed at the bottom of the first filtering area, a third-layer sampling column slidably connected to the inner wall of the third-layer sampling bucket, a third-layer limiting plate disposed at the top of the third-layer sampling column, a set of third-layer limiting points disposed in the middle of the third-layer sampling column, and a third-layer sealing plate disposed at the bottom of the third-layer sampling column.

[0012] In a preferred embodiment of the layered sampling device of the present invention, the first layer limiting point is fixedly connected to the top of the first layer sampling column, and the first layer limiting point is adapted to the first layer limiting groove.

[0013] In a preferred embodiment of the stratified sampling device of the present invention, the first layer sealing plate is fixedly connected to the bottom of the first layer sampling column, the first layer sealing plate is circular in shape, and the outer diameter of the first layer sealing plate is smaller than the outer diameter of the first layer sampling barrel and larger than the inner diameter of the first layer sampling barrel.

[0014] In a preferred embodiment of the stratified sampling device of the present invention, the third layer sealing plate is fixedly connected to the bottom of the third layer sampling column, the third layer sealing plate is circular in shape, and the outer diameter of the third layer sealing plate is smaller than the outer diameter of the third layer sampling barrel and larger than the inner diameter of the third layer sampling barrel.

[0015] In a preferred embodiment of the layered sampling device of the present invention, the aperture of the first filter zone is larger than that of the second filter zone, the distance between the first limiting groove and the second limiting groove is equal to the length of the first sliding groove and the depth of the first filter zone, and the distance between the second limiting groove and the bottom of the third layer sampling bucket is equal to the length of the first sliding groove and the depth of the second filter zone.

[0016] In a preferred embodiment of the layered sampling device of the present invention, the third layer limiting point is fixedly connected to the side of the third layer sampling column that is close to the inner wall of the third layer sampling barrel, and the third layer limiting point is adapted to the first limiting groove, the second limiting groove, the first sliding groove and the second sliding groove.

[0017] The beneficial effects of this invention are as follows: By setting up a wastewater collection area, the present invention collects wastewater centrally before unified discharge, effectively avoiding the pollution caused by direct discharge of wastewater to the environment and providing convenience for subsequent sampling processes. In the wastewater collection area, stratified sampling at different depths not only helps to accurately analyze the wastewater composition, but also provides data support for the formulation of targeted treatment measures, enabling subsequent analysis processes to have a more comprehensive understanding of the distribution of pollutants in the wastewater. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments 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. Wherein:

[0019] Figure 1 This is a schematic diagram of the overall structure of the stratified sampling device.

[0020] Figure 2 This is an exploded view of the overall structure of the stratified sampling device.

[0021] Figure 3 This is an exploded view of the sampling structure of a layered sampling device.

[0022] Figure 4 This is a schematic cross-sectional view of the stratified sampling device. Detailed Implementation

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0026] Example 1

[0027] Reference Figures 1-2 This is the first embodiment of the present invention. This embodiment provides a stratified sampling device. Through the cooperation of the collection unit 100 and the sampling unit 200, the problem of centralized collection and stratified sampling of wastewater before discharge is solved, and the beneficial effect of accurately sampling wastewater samples from different locations is achieved. Specifically, the system includes a collection unit 100, which provides the basis for wastewater collection. The collection unit 100 includes a collection component 101 primarily for preserving wastewater before discharge, an installation component 102 located at one end of the collection component 101 for fixing the device to a pipeline, and a drainage component 103 located at the other end of the collection component 101 for discharging wastewater. A sampling unit 200 provides the basis for subsequent stratified sampling. The sampling unit includes a first-layer sampling component 201 located at the top of the collection unit 100 and near the drainage component 103, providing the basis for filtering surface suspended solids in the wastewater; a second-layer sampling component 202 located at the top of the collection unit 100 and between the installation component 102 and the drainage component 103, providing the basis for obtaining a second layer of wastewater mixture; and a third-layer sampling component 203 located at the top of the collection unit 100 and near the installation component 102, providing the basis for filtering heavy metals and other sediments at the bottom.

[0028] Furthermore, the collection assembly 101 includes a collection pipe 101a and a vent 101b disposed on the top of the collection pipe 101a; the mounting assembly 102 includes a mounting flange 102a disposed on the other end of the collection pipe 101a; the drainage assembly 103 includes a drainage pipe 103a disposed on one end of the collection pipe 101a and a control water valve 103b disposed on the drainage pipe 103a.

[0029] In use, it is adapted to the wastewater discharge pipe and installed through flange 102a. When the wastewater flows into the collection pipe 101a, the gas in the pipe is discharged through the vent 101b and stored in the collection pipe 101a. After sampling is completed, the wastewater stored in the collection pipe 101a flows out through the drain pipe 103a by opening the control water valve 103b.

[0030] In summary, the advantages of a stratified sampling device are that it can collect wastewater in a centralized manner before discharge through the collection unit, effectively avoiding the pollution caused by direct discharge of wastewater to the environment and providing convenience for subsequent sampling processes; by using different structures to perform stratified sampling of wastewater at different depths through the sampling unit, it helps to understand the distribution of pollutants in the wastewater more comprehensively and take targeted treatment in the later stage.

[0031] Example 2

[0032] Reference Figures 2-4 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a layered sampling device. By setting three different devices—a first-layer sampling component 201, a second-layer sampling component 202, and a third-layer sampling component 203—for water quality sampling at different depths, it achieves targeted sampling of wastewater at different depths, which helps to more comprehensively understand the distribution of pollutants in the wastewater. Specifically, the first-layer sampling component 201 includes a first-layer sampling bucket 201a fixedly connected to the collection pipe 101a, a first-layer limiting groove 201b symmetrically arranged at the top of the first-layer sampling bucket 201a, a first-layer sampling limiting surface 201c arranged at the lower end of the first-layer limiting groove 201b, a first-layer filter screen 201d arranged at the bottom of the first-layer sampling bucket 201a, a first-layer sampling column 201e slidingly engaged with the inner wall of the first-layer sampling bucket 201a, a set of first-layer limiting points 201f arranged at the top of the first-layer sampling column 201e, and a first-layer sealing plate 201g arranged at the bottom of the first-layer sampling column 201e.

[0033] Furthermore, the second sampling assembly 202 includes a second sampling bucket 202a fixedly connected to the collection pipe 101a, and a second filter screen 202b disposed at the bottom of the second sampling bucket 201a. The second sampling bucket 202a is directly connected to the air, which can ensure that when wastewater flows into the collection pipe 101a, it also assists the exhaust port 101b in quickly removing excess gas from the pipe.

[0034] Furthermore, the third-layer sampling assembly 203 includes a third-layer sampling bucket 203a fixedly connected to the collection pipe 101a, a first limiting groove 203b and a second limiting groove 203c disposed on the inner wall of the third-layer sampling bucket 203a, a first sliding groove 203d disposed in the middle of the first limiting groove 203b and the second limiting groove 203c, a second sliding groove 203e disposed at the lower part of the second limiting groove 203c, a first filtering area 203f disposed at the bottom of the third-layer sampling bucket 203a, a second filtering area 203g disposed at the bottom of the first filtering area 203f, a third-layer sampling column 203h slidably connected to the inner wall of the third-layer sampling bucket 203a, a third-layer limiting plate 203i disposed at the top of the third-layer sampling column 203g, a set of third-layer limiting points 203j disposed in the middle of the third-layer sampling column 203h, and a third-layer sealing plate 201k disposed at the bottom of the third-layer sampling column 203h.

[0035] Furthermore, the first layer limiting point 201f is fixedly connected to the top of the first layer sampling column 201e, and the first layer limiting point 201f is adapted to the first layer limiting groove 201b.

[0036] Furthermore, the first sealing plate 201g is fixedly connected to the bottom of the first sampling column 201e. The first sealing plate 201g is circular in shape, and its outer diameter is smaller than the outer diameter of the first sampling barrel 201a and larger than the inner diameter of the first sampling barrel 201a.

[0037] Furthermore, the third sealing plate 201k is fixedly connected to the bottom of the third sampling column 203h. The third sealing plate 201k is circular in shape, and its outer diameter is smaller than the outer diameter of the third sampling barrel 203a but larger than the inner diameter of the third sampling barrel 203a.

[0038] Furthermore, the aperture of the second filter zone 203g, the distance between the first limiting groove 203b and the second limiting groove 203c are equal to the length of the first sliding groove 203d and the depth of the first filter zone 203f, and the distance from the second limiting groove 203c to the bottom of the third layer sampling barrel 203a is equal to the length of the first sliding groove 203d and the depth of the second filter zone 203g.

[0039] Furthermore, the third-layer limiting point 203j is fixedly connected to the third-layer sampling column 203g on the side of the inner wall of the third-layer sampling bucket 203a. The third-layer limiting point 203j is compatible with the first limiting groove 203b, the second limiting groove 203c, the first sliding groove 203d, and the second sliding groove 203e.

[0040] It should be noted that when the inner diameter of the collection pipe 101a is 100mm, the first layer refers to the liquid level position of the collection pipe 101a at 0~20mm; the second layer refers to the liquid level position of the collection pipe 101a at 40~50mm; and the third layer refers to the liquid level position of the collection pipe 101a at 80~100mm.

[0041] During use, the first sealing plate 201g is compressed by the buoyancy of the wastewater in the collection pipe 101a, causing it to fit tightly against the bottom of the first sampling bucket 201a, forming a sealed space. During sampling, the first sampling column 201e is rotated so that the first limiting point 201f moves away from the first limiting groove 201b, at which point the first sampling column 201e points downwards. When the first limiting point 201f moves to the first sampling limiting surface 201c, the first sampling column 201e stops moving. Simultaneously, the first sealing plate 201g, fixedly connected to the bottom of the first sampling column 201e... Simultaneously, 01g moves downwards, opening the bottom sealed space. At the same time, the first sealing plate 201g and the first filter screen 201d form a sampling area. During the movement of the first sealing plate 201g, the first layer of liquid is affected by the water pressure changes on both sides and moves rapidly into the sampling area inside the first filter screen 201d. The first filter screen 201d simultaneously filters the surface suspended solids of the wastewater. At this time, a syringe-type sealed sampling device is used to insert the sampling tip into the area inside the first filter screen 201d for sampling. After sampling, it is immediately pulled out to complete the targeted sampling of the first layer of water quality.

[0042] Because the second-layer sampling tank 202a is connected to the air, when wastewater flows into the second-layer sampling tank 202a, the surface of the wastewater and the suspended solids in the second layer are directly filtered out through the second-layer filter screen 202b. At this time, a syringe-type sealed sampling device is used, and the sampling tip is inserted into the bottom of the second-layer sampling tank 202a. The second-layer filter screen 202b at the bottom can ensure that the sampling device is exactly in the second-layer area. After sampling, it is immediately pulled out, thus completing the targeted sampling of the water quality in the second layer.

[0043] The third sealing plate 201k is compressed by the buoyancy of the wastewater in the collection pipe 101a, and it fits tightly against the bottom of the third sampling bucket 203a, forming a sealed space. During sampling, the third sampling column 203h is rotated first, causing the third limiting point 203j to move from the first limiting groove 203b to one end of the first sliding groove 203d. Then, the third limiting point 203j is slid to the other end of the first sliding groove 203d. At this time, the third sealing plate 201k, which is fixedly connected to the bottom of the third sampling column 203g, moves downward from the top of the first filtration zone 203f to the top of the second filtration zone 203g, opening the bottom sealing space. Simultaneously, the first filtration zone 203f and the third sealing plate 201k form the sampling area for the third layer of small particle mixture liquid. Then, a syringe-type sealed sampling device is used to insert the sampling tip into the sampling area of ​​the third layer of small particle mixture liquid. Sampling is performed in the sampling area, and the sample is immediately withdrawn after sampling to complete the sampling of the third layer of small particle mixture liquid. Next, the third layer sampling column 203g is rotated again, so that the third layer limiting point 203j moves from the second limiting groove 203c to one end of the second sliding groove 203e, and then the third layer limiting point 203j is slid to the other end of the second sliding groove 203e. At this time, the third layer sealing plate 201k, which is fixedly connected to the bottom of the third layer sampling column 203g, moves down from the top of the second filtration zone 203g to the bottom of the second filtration zone 203g. This position is also the bottom of the collection pipe 101a. At the same time, the second filtration zone 203g and the third layer sealing plate 201k form the third layer sampling area. Then, a syringe-type sealing sampling device is used to insert the sampling tip into the third layer sampling area for sampling. After sampling, the sample is immediately withdrawn to complete the targeted sampling of the third layer of water quality.

[0044] In summary, the beneficial effects of a stratified sampling device are as follows: the first-layer sampling component filters floating debris from the surface of the first layer of water through a first-layer filter screen, effectively ensuring the accuracy of the first-layer sample; the second-layer sampling component quickly locates the center of the wastewater and, through filtration by the second-layer filter screen, effectively ensures the accuracy of the second-layer sample; the third-layer sampling component, through the cooperation of two sets of sliding grooves and limiting grooves, and the filtration of some metal and other sediments by two sets of filtration zones, achieves separate sampling in the first and second filtration zones, effectively ensuring the accuracy of the second-layer sample. By setting sampling components at different depths, accurate sampling of water quality at different depths can be achieved, which helps to more comprehensively understand the distribution of pollutants in wastewater before unified treatment and discharge.

[0045] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0046] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0047] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A stratified sampling device, characterized in that: The collection unit (100) includes a collection component (101), an installation component (102) disposed at one end of the collection component (101), and a drainage component (103) disposed at the other end of the collection component (101). The sampling unit (200) includes a first sampling component (201) disposed on top of the collection unit (100) and close to the drainage component (103), a second sampling component (202) disposed on top of the collection unit (100) and located between the installation component (102) and the drainage component (103), and a third sampling component (203) disposed on top of the collection unit (100) and close to the installation component (102).

2. The stratified sampling device as described in claim 1, characterized in that: The collection assembly (101) includes a collection pipe (101a) and an exhaust port (101b) disposed at the top of the collection pipe (101a). The mounting assembly (102) includes a mounting flange (102a) disposed at the other end of the collection pipe (101a). The drainage assembly (103) includes a drainage pipe (103a) disposed at one end of the collection pipe (101a) and a control water valve (103b) disposed on the drainage pipe (103a).

3. The stratified sampling device as described in claim 2, characterized in that: The first layer sampling assembly (201) includes a first layer sampling bucket (201a) fixedly connected to the collection pipe (101a), a first layer limiting groove (201b) symmetrically arranged on the top of the first layer sampling bucket (201a), a first layer sampling limiting surface (201c) arranged at the lower end of the first layer limiting groove (201b), a first layer filter screen (201d) arranged at the bottom of the first layer sampling bucket (201a), a first layer sampling column (201e) slidably engaged with the inner wall of the first layer sampling bucket (201a), a set of first layer limiting points (201f) arranged on the top of the first layer sampling column (201e), and a first layer sealing plate (201g) arranged at the bottom of the first layer sampling column (201e).

4. The stratified sampling device as described in claim 3, characterized in that: The second sampling assembly (202) includes a second sampling bucket (202a) fixedly connected to the collection pipe (101a) and a second filter screen (202b) disposed at the bottom of the second sampling bucket (202a).

5. The stratified sampling device as described in claim 4, characterized in that: The third-layer sampling assembly (203) includes a third-layer sampling bucket (203a) fixedly connected to the collection pipe (101a), a first limiting groove (203b) and a second limiting groove (203c) disposed on the inner wall of the third-layer sampling bucket (203a), a first sliding groove (203d) disposed in the middle of the first limiting groove (203b) and the second limiting groove (203c), a second sliding groove (203e) disposed at the lower part of the second limiting groove (203c), and a third sampling bucket (203a) disposed on the inner wall of the third-layer sampling bucket (203a). The third layer sampling column (203h) is slidably connected to the inner wall of the third layer sampling barrel (203a), a third layer limiting plate (203i) is disposed at the top of the third layer sampling column (203h), a set of third layer limiting points (203j) is disposed in the middle of the third layer sampling column (203h), and a third layer sealing plate (201k) is disposed at the bottom of the third layer sampling column (203h).

6. The stratified sampling device as described in claim 5, characterized in that: The first layer limiting point (201f) is fixedly connected to the top of the first layer sampling column (201e), and the first layer limiting point (201f) is adapted to the first layer limiting groove (201b).

7. The stratified sampling device as described in claim 6, characterized in that: The first layer sealing plate (201g) is fixedly connected to the bottom of the first layer sampling column (201e). The first layer sealing plate (201g) is circular in shape. The outer diameter of the first layer sealing plate (201g) is smaller than the outer diameter of the first layer sampling bucket (201a) and larger than the inner diameter of the first layer sampling bucket (201a).

8. The stratified sampling device as described in claim 7, characterized in that: The third sealing plate (201k) is fixedly connected to the bottom of the third sampling column (203h). The third sealing plate (201k) is circular in shape. The outer diameter of the third sealing plate (201k) is smaller than the outer diameter of the third sampling barrel (203a) and larger than the inner diameter of the third sampling barrel (203a).

9. The stratified sampling device as described in claim 8, characterized in that: The aperture of the first filter zone (203f) is larger than that of the second filter zone (203g). The distance between the first limiting groove (203b) and the second limiting groove (203c) is equal to the length of the first sliding groove (203d) and the depth of the first filter zone (203f). The distance between the second limiting groove (203c) and the bottom of the third sampling bucket (203a) is equal to the length of the first sliding groove (203d) and the depth of the second filter zone (203g).

10. The stratified sampling device as described in claim 9, characterized in that: The third limiting point (203j) is fixedly connected to the third sampling column (203h) on the side of the inner wall of the third sampling bucket (203a). The third limiting point (203j) is compatible with the first limiting groove (203b), the second limiting groove (203c), the first sliding groove (203d), and the second sliding groove (203e).

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