A sampling device

Abstract

This invention provides a sampling device, comprising: a liquid collection tube with a top inlet and a bottom outlet, respectively; a liquid collection sleeve fitted over the liquid collection tube and coaxial with the liquid collection tube; from top to bottom, the liquid collection sleeve includes a gripping part, a connecting part, and a protective part; a flexible valve is provided at the bottom end of the protective part; and a sleeve adjustment assembly for detachably connecting the connecting part and the liquid collection tube, and adjusting the installation position of the liquid collection sleeve on the liquid collection tube; during sampling, the liquid collection sleeve is installed in a first position on the liquid collection tube, with the bottom of the liquid collection tube opening the flexible valve and extending below the protective part; when sampling stops, the liquid collection sleeve is installed in a second position on the liquid collection tube, with the outlet retracted within the liquid collection sleeve and the flexible valve closed; the second position is located below the first position. This invention ensures the safety of sampling operations for hazardous materials, greatly improves sampling efficiency, and effectively avoids sample contamination.

Description

Technical Field

[0001] This utility model relates to the field of sampling and testing technology, and in particular to a sampling device. Background Technology

[0002] In industries such as semiconductors, food processing, laboratory research, and environmental monitoring, accurate analysis and testing of the properties of liquid materials are crucial for ensuring product quality, advancing scientific research, and achieving effective environmental monitoring. Among these processes, the sampling of liquid materials is a critical step before analytical testing, specifically in the process of extracting individual samples from a population for experimentation or observation.

[0003] To overcome the numerous limitations of manual sampling, such as slow sampling speed, high labor intensity, and the significant impact of human factors on sampling accuracy, scientific researchers have dedicated themselves to the development of efficient sampling devices. Through tireless efforts, a series of advanced automatic sampling devices have emerged, significantly reducing the labor intensity of operators. Operators no longer need to repeatedly perform tedious manual sampling operations, while simultaneously improving the representativeness and accuracy of samples, allowing the sampling results to more accurately reflect the overall characteristics of the material.

[0004] However, sample contamination is a major challenge for automated sampling devices (AS / RS). The sampling port of an AS / RS comes into direct contact with the sample being tested. Due to its long-term exposure to a complex external environment and frequent interactions with various samples, it becomes the most susceptible to contamination. This not only leads to distorted analytical results but can also trigger a series of chain reactions, such as inaccurate monitoring results during production, biased research data, and even fluctuations in product quality. All of these can cause incalculable losses to related fields.

[0005] The statements herein provide only background information relating to this invention and do not necessarily constitute prior art. Utility Model Content

[0006] The purpose of this invention is to provide a sampling device that can be directly applied to the sampling of hazardous liquids, ensuring the safety and efficiency of the sampling operation, and effectively avoiding contamination of the sample.

[0007] To achieve the above objectives, this utility model provides a sampling device, comprising:

[0008] The liquid collection tube has a straight-line structure; the top and bottom openings of the liquid collection tube are the liquid inlet and liquid outlet, respectively, and the liquid inlet is connected to the sample source through a liquid pipeline;

[0009] A liquid collection sleeve is fitted over the outside of the liquid collection tube and is coaxial with the liquid collection tube; from top to bottom, the liquid collection sleeve includes a gripping part, a connecting part, and a protective part; the bottom end of the protective part is provided with a flexible valve;

[0010] A sleeve adjustment assembly is used to detachably connect the joint and the liquid collection tube, and to adjust the installation position of the liquid collection sleeve on the liquid collection tube.

[0011] During sampling, the liquid sampling sleeve is installed at a first position on the liquid sampling tube, and the bottom of the liquid sampling tube pushes open the flexible valve and extends below the protective part; when sampling stops, the liquid sampling sleeve is installed at a second position on the liquid sampling tube, the liquid outlet is retracted inside the liquid sampling sleeve, and the flexible valve is in a closed state; the second position is located below the first position.

[0012] Optionally, the sleeve adjustment assembly includes: an elastic collar, a sleeve, an adjusting screw, and an adjusting band;

[0013] The sleeve is fixedly embedded inside the joint, and the central axis of the sleeve is perpendicular to the central axis of the liquid-collecting sleeve.

[0014] The adjusting screw includes a screw rod and a screw head; the screw rod is located inside the sleeve and is threadedly connected to the sleeve; the screw head is located outside the liquid-collecting sleeve;

[0015] The elastic collar has a C-shaped structure, which is located inside the joint and sleeved on the liquid collection tube; the opening of the C-shaped structure faces the sleeve; a first channel is provided inside the elastic collar along the circumferential direction; the middle of the adjusting band passes through the first channel, and both ends of the adjusting band extend to the outside of the elastic collar and are connected to the end face of the screw.

[0016] Optionally, the sampling device further includes a sealing plug for sealing the sampling bottle; the sealing plug has an assembly hole; during sampling, the bottom of the sampling tube passes through the assembly hole, and the outlet is located inside the sampling bottle.

[0017] Optionally, the inner wall of the assembly hole is provided with multiple elastic protrusions.

[0018] Optionally, the sealing plug has a frustum-shaped structure that is larger at the top and smaller at the bottom.

[0019] Optionally, an annular groove is formed on the outer side wall of the top of the sealing plug along the circumferential direction.

[0020] Optionally, the sampling device further includes a pressure-reducing guide tube, which passes through the sealing plug and connects the internal environment of the sampling bottle to the atmospheric environment.

[0021] Optionally, the grip portion has a flared structure that is wider at the top and narrower at the bottom.

[0022] Optionally, the connecting part has a spherical structure.

[0023] Optionally, the sealing plug, the liquid extraction tube, the liquid extraction sleeve, and the sleeve adjustment assembly are all made of perfluoroalkoxy resin.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] 1) The sampling device of this utility model is suitable for sampling hazardous liquids (such as strong acids, strong alkalis, and organic liquids). During sampling, the sealing plug seals the mouth of the sampling bottle. The sleeve adjustment assembly fixes the liquid-collecting sleeve in a first position on the liquid-collecting tube. The flexible valve at the bottom of the liquid-collecting sleeve is pushed open by the liquid-collecting tube, and the outlet of the liquid-collecting tube extends outside the liquid-collecting sleeve. When not sampling, the sealing plug is removed, and the sleeve adjustment assembly fixes the liquid-collecting sleeve in a second position on the liquid-collecting tube (below the first position). The liquid-collecting tube retracts inside the liquid-collecting sleeve, and the flexible valve seals and blocks the outlet of the liquid-collecting tube. This utility model not only effectively isolates hazardous liquids from direct contact with the external environment during sampling operations but also significantly reduces potential safety hazards caused by liquid evaporation or accidental leakage, greatly reducing the potential health threat of harmful substances to operators, while also maintaining a clean and safe working environment.

[0026] When the outlet is retracted within the sampling sleeve, the outlet can be submerged by the residual sample inside the sampling tube, maintaining its cleanliness and significantly reducing the possibility of contamination from the external environment. This invention ensures that the purity of the collected samples meets high standards, thereby precisely meeting the urgent and stringent requirements for high-quality sampling in various fields such as semiconductor manufacturing, large-scale industrial production, and cutting-edge laboratory research.

[0027] 2) The assembly hole for the sealing plug at the bottom of the sampling tube is located inside the sampling bottle. The elastic protrusions on the inner wall of the assembly hole effectively seal the gap between the sampling tube and the sealing plug, and also help to secure the sampling tube. After sampling, when the sealing plug is removed from the sampling tube, the multiple elastic protrusions effectively clean the outer wall of the sampling tube, preventing residue from the previous sampling from contaminating the next sampling. This ensures the purity and independence of each sampling, thereby significantly improving the accuracy of the sampling results and the representativeness of the samples.

[0028] 3) The sampling device of this utility model adopts a fully enclosed structure (the liquid sampling tube is isolated from the external environment). Therefore, it not only significantly saves the time cost caused by repeated cleaning and replacement of the liquid sampling tube, effectively reduces the unnecessary loss of cleaning solvent, but also reduces the consumption of raw materials and manpower input, bringing substantial economic benefits to enterprises and research institutions.

[0029] 4) The sampling device of this utility model is made of perfluoroalkoxy resin. This material not only has excellent corrosion resistance and high temperature resistance, but also can effectively avoid the problem of metal ion contamination in many key fields such as semiconductor manufacturing, high-end chemical production and precision laboratory research. This is crucial for ensuring sample purity and improving the accuracy of test results.

[0030] 5) The sampling device of this utility model has the advantages of convenient installation, compact overall design, and easy portability and operation. The outer wall of the sealing plug has an annular groove for easy gripping. The funnel-shaped grip allows for easy adjustment of the liquid collection sleeve, comprehensively improving the efficiency of sampling. The original method of multiple people carrying samples to a unified sampling device is replaced by one person directly taking samples on-site, reducing personnel involvement and significantly lowering the risk of contamination from the sampling device and human error.

[0031] 6) This invention connects the internal environment of the sampling bottle with the atmospheric environment through a pressure-reducing guide tube, preventing the sealing plug from being forced open due to excessive pressure inside the sampling bottle during sampling. This ensures smooth sampling. Attached Figure Description

[0032] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings in the following description are one embodiment of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0033] Figure 1 This is a schematic diagram of sampling using the sampling device of this utility model.

[0034] Figure 2 This is a schematic diagram showing the liquid collection tube retracted inside the liquid collection sleeve in an embodiment of this utility model.

[0035] Figure 3 This is a cross-sectional view of the liquid collection tube, the liquid collection sleeve, and the sleeve adjustment assembly in an embodiment of the present invention.

[0036] Figure 4 This is a schematic diagram of the sleeve adjustment assembly in an embodiment of the present invention.

[0037] Figure 5This is a schematic diagram of the sleeve adjustment assembly in another embodiment of the present invention.

[0038] Figure 6 This is a cross-sectional view of the sealing plug in an embodiment of the present invention.

[0039] In the picture:

[0040] 1 Liquid collection tube

[0041] 1_1 Liquid Inlet

[0042] 1_2 liquid outlet

[0043] 2. Liquid sampling sleeve

[0044] 2_1 Grip Section

[0045] 2_2 Joint

[0046] 2_3 Protection Department

[0047] 3. Flexible valves

[0048] 4-tube adjustment assembly

[0049] 5 elastic collars

[0050] 6 Adjusting screws

[0051] 6_1 Screw

[0052] 6_2 screw head

[0053] 7 Adjustment belt

[0054] 8 sleeves

[0055] 9 Adjustment knobs

[0056] 10 flanges

[0057] 11 Sealing Plug

[0058] 12 pressure reducing guide tubes

[0059] 13 assembly holes

[0060] 14 elastic protrusions

[0061] 15 Annular Grooves

[0062] 16 sampling bottles Detailed Implementation

[0063] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0064] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0065] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0066] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0067] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrases "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0068] Furthermore, in the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0069] This embodiment provides a sampling device suitable for sampling hazardous liquids (such as strong acids, strong alkalis, and organic liquids). Figure 1 As shown, the sampling device includes: a liquid sampling tube 1, a liquid sampling sleeve 2, a sleeve adjustment assembly 4, and a sealing plug 11.

[0070] like Figure 1As shown, the liquid sampling tube 1 has a straight-line structure. The liquid sampling tube 1 is vertically arranged, with its top opening being the liquid inlet 1_1 and its bottom opening being the liquid outlet 1_2. The liquid inlet 1_1 is connected to the sample source (not shown in the figure) through a liquid pipeline (not shown in the figure), and a flow control switch (not shown in the figure) is provided on the liquid pipeline.

[0071] like Figure 1 , Figure 2 , Figure 3 As shown, the liquid collection sleeve 2 is sleeved outside the liquid collection tube 1, and the liquid collection sleeve 2 and the liquid collection tube 1 are coaxial. From top to bottom, the liquid collection sleeve 2 includes a gripping part 2_1, a connecting part 2_2, and a protective part 2_3. The gripping part 2_1 has a trumpet-shaped structure that is larger at the top and smaller at the bottom. The gripping part 2_1 facilitates the vertical adjustment of the liquid collection sleeve 2, improving work efficiency. The bottom end of the protective part 2_3 is provided with a flexible valve 3. In its natural state, the flexible valve 3 is in a closed state.

[0072] The sleeve adjustment assembly 4 is used to detachably connect the joint 2_2 and the liquid collection tube 1, fix the liquid collection sleeve 2 on the liquid collection tube 1, and adjust the installation position of the liquid collection sleeve 2 on the liquid collection tube 1.

[0073] During sampling, the mouth of the sampling bottle 16 is sealed with the sealing plug 11. The sampling sleeve 2 is fixedly installed in the first position on the sampling tube 1 using the sleeve adjustment assembly 4. At this time, the flexible valve 3 at the bottom of the sampling sleeve 2 is pushed open by the sampling tube 1, and the outlet 1_2 of the sampling tube 1 extends to the bottom of the sampling sleeve 2. The sealing plug 11 is inserted through the bottom of the sampling tube 1, and the outlet 1_2 is positioned inside the sampling bottle 16. Sampling can begin by turning on the flow control switch.

[0074] When not sampling, turn off the flow control switch and remove the sealing plug 11 from the liquid collection tube 1. Fix the liquid collection sleeve 2 on the liquid collection tube 1 at the second position (below the first position) using the sleeve adjustment assembly 4. At this time, the liquid collection tube 1 is retracted into the liquid collection sleeve 2, and the flexible valve 3 is closed, blocking the liquid outlet 1_2 of the liquid collection tube 1.

[0075] This invention not only effectively isolates hazardous liquids from direct contact with the external environment during sampling operations, but also significantly reduces potential safety hazards caused by liquid evaporation or accidental leakage, greatly reducing the potential health threats of harmful substances to operators, while also maintaining a clean and safe working environment.

[0076] When the outlet 1_2 is retracted within the sampling sleeve 2, the outlet 1_2 can be submerged by the residual sample in the sampling tube 1, thus maintaining its cleanliness and significantly reducing the possibility of contamination from the external environment. This invention ensures that the purity of the collected samples meets high standards, thereby precisely meeting the urgent and stringent requirements for high-quality sampling in various fields such as semiconductor manufacturing, large-scale industrial production, and cutting-edge laboratory research.

[0077] The liquid collection tube 1, liquid collection sleeve 2, sleeve adjustment assembly 4, and sealing plug 11 of this utility model are all made of perfluoroalkoxy resin. This material not only has excellent corrosion resistance and high temperature resistance, but also can effectively avoid the problem of metal ion contamination in many key fields such as semiconductor manufacturing, high-end chemical production, and precision laboratory research. This is crucial for ensuring sample purity and improving the accuracy of test results.

[0078] The sampling device of this utility model adopts a fully enclosed structure (the liquid sampling tube 1 is isolated from the external environment). Therefore, it not only significantly saves the time cost caused by repeated cleaning and replacement of the liquid sampling tube 1, effectively reduces unnecessary consumption of cleaning solvent, but also reduces raw material consumption and manpower input, bringing substantial economic benefits to enterprises and research institutions.

[0079] like Figure 3 , Figure 4 As shown, in this embodiment, the sleeve adjustment assembly 4 includes: an elastic collar 5, a sleeve 8, an adjusting screw 6, and an adjusting belt 7.

[0080] like Figure 3 As shown, the joint 2_2 has a spherical structure, which can improve rigidity and provide installation space for the sleeve adjustment assembly. The sleeve 8 is fixedly embedded inside the joint 2_2, and there is no relative displacement between the sleeve 8 and the liquid extraction sleeve 2. For example, the sleeve 8 and the liquid extraction sleeve 2 can be fixedly connected by adhesive.

[0081] like Figure 3 , Figure 4 As shown, the central axis of sleeve 8 is perpendicular to the central axis of liquid-taking sleeve 2. Figure 4 As shown, the adjusting screw 6 includes a screw rod 6_1 and a screw head 6_2. The screw rod 6_1 is located inside the sleeve 8 and is threadedly connected to the sleeve 8. Figure 3 As shown, the screw head 6_2 is located outside the liquid extraction sleeve 2.

[0082] like Figure 3 As shown, a cavity is provided inside the joint 2_2, and the elastic collar 5 is disposed in the cavity and sleeved on the liquid collection tube 1. Under normal conditions, the inner diameter of the elastic collar 5 is larger than the outer diameter of the liquid collection tube 1. Figure 4As shown, the elastic collar 5 has a C-shaped structure, with the open end of the C-shaped structure abutting against the sleeve 8. A first channel is provided inside the elastic collar 5 along its circumferential direction. The adjusting band 7 passes through the first channel in its middle, and both ends of the adjusting band 7 extend to the outside of the elastic collar 5 and connect to the end face of the screw 6_1. The inner diameter of the elastic collar 5 can be adjusted by rotating the adjusting screw 6, thereby causing the elastic collar 5 to grip the liquid collection tube 1, thus fixing the liquid collection sleeve 2 onto the liquid collection tube 1.

[0083] When the elastic collar 5 does not grip the liquid collection tube 1 tightly, the installation position of the liquid collection sleeve 2 on the liquid collection tube 1 can be adjusted up and down (the liquid collection tube 1 remains stationary, while the liquid collection sleeve 2 moves up and down).

[0084] In another embodiment, such as Figure 5 As shown, the sleeve adjustment assembly 4 includes: an elastic collar 5, an adjusting screw 6, and an adjusting knob 9.

[0085] Figure 5 In this assembly, an elastic collar 5 is embedded inside the liquid-collecting sleeve 2 and fitted onto the liquid-collecting tube 1. Without external force, the inner diameter of the elastic collar 5 is larger than the outer diameter of the liquid-collecting tube 1. The elastic collar 5 has a C-shaped structure, with two radially outwardly extending flanges 10 at the opening of the C-shaped structure.

[0086] The adjusting screw 6 includes a screw rod 6_1 and a screw head 6_2. The screw rod 6_1 has two flanges 10 passing through it and is threadedly connected to the two flanges 10. The adjusting knob 9 is sleeved on the screw rod 6_1 and threadedly connected to it. The two flanges 10 are located between the screw head 6_2 and the adjusting knob 9. By rotating the adjusting knob 9, the distance between the two flanges 10 can be adjusted, causing the elastic collar 5 to grip the liquid collection tube 1, thereby fixing the liquid collection sleeve 2 onto the liquid collection tube 1.

[0087] In this embodiment, as Figure 1 , Figure 6 As shown, the sealing plug 11 has a frustum-shaped structure that is larger at the top and smaller at the bottom, which can be adapted to sampling bottles 16 of different diameters. Along the circumferential direction of the sealing plug 11, an annular groove 15 is formed on the outer side wall of the top of the sealing plug 11, making it easy to grip the sealing plug 11.

[0088] The sealing plug 11 has an assembly hole 13 for accommodating the liquid extraction tube 1, such as... Figure 6As shown, the inner wall of the assembly hole 13 is provided with multiple elastic protrusions 14. When the bottom of the liquid collection tube 1 passes through the assembly hole 13, the multiple elastic protrusions 14 surround the outer periphery of the liquid collection tube 1 and abut against the liquid collection tube 1. The elastic protrusions 14 on the inner wall of the assembly hole can not only effectively seal the gap between the liquid collection tube 1 and the sealing plug 11, but also help to fix the liquid collection tube 1. After sampling, when the sealing plug 11 is removed from the liquid collection tube 1, the multiple elastic protrusions 14 can also effectively clean the outer wall of the liquid collection tube 1, avoiding the residue from the previous sampling from contaminating the next sampling, ensuring the purity and independence of each sampling, and thus significantly improving the accuracy of the sampling results and the representativeness of the samples.

[0089] In this embodiment, the sampling device further includes a pressure-reducing guide tube 12, through which a sealing plug 11 passes and connects the internal environment of the sampling bottle 16 to the atmospheric environment. The pressure-reducing guide tube 12 can prevent the sealing plug 11 from being opened due to excessive pressure inside the sampling bottle 16 during sampling, thus ensuring smooth sampling.

[0090] The sampling device of this utility model has the advantages of convenient installation, compact overall design, and easy portability and operation. It changes the original method of having multiple people carry samples to a unified sampling device, allowing one person to directly take samples on-site, reducing personnel involvement and greatly reducing the risk of contamination from the sampling device and human error.

[0091] The sampling operation performed using the sampling device described in this utility model includes the following steps:

[0092] S101. During sampling, adjust the sleeve adjustment assembly 4 so that the liquid collection sleeve 2 is fixed in the first position on the liquid collection tube 1, and the liquid outlet 1_2 of the liquid collection tube 1 pushes open the flexible valve 3 of the liquid collection sleeve 2 and extends to the outside of the liquid collection sleeve 2.

[0093] S102. The sealing plug 11 is fitted onto the bottom of the liquid collection sleeve 2, and the liquid outlet 1_2 of the liquid collection tube 1 is located inside the sampling bottle 16.

[0094] S103. Turn on the flow control switch, and the sample self-collection tube 1 flows into the sampling bottle 16.

[0095] The sampling operation performed using the sampling device described in this utility model further includes the following steps:

[0096] S201. When stopping sampling, turn off the flow control switch and remove the sealing plug 11 on the sampling tube 1;

[0097] S202, Adjust the sleeve adjustment assembly 4 to fix the liquid collection sleeve 2 in a second position on the liquid collection tube 1, the second position being located below the first position;

[0098] S203, the liquid outlet 1_2 is retracted inside the liquid collection sleeve 2, the flexible valve 3 is closed, and the liquid outlet 1_2 is submerged by the residual sample in the liquid collection tube 1.

[0099] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0100] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A sampling device, characterized in that, include: The liquid collection tube (1) has a straight structure; the top opening and the bottom opening of the liquid collection tube (1) are respectively the liquid inlet (1_1) and the liquid outlet (1_2), and the liquid inlet (1_1) is connected to the sample source through a liquid pipeline; A liquid collection sleeve (2) is sleeved outside the liquid collection tube (1) and has the same central axis as the liquid collection tube (1); from top to bottom, the liquid collection sleeve (2) includes a gripping part (2_1), a connecting part (2_2) and a protective part (2_3); the bottom end of the protective part (2_3) is provided with a flexible valve (3); The sleeve adjustment assembly (4) is used to detachably connect the joint (2_2) and the liquid collection tube (1) and adjust the installation position of the liquid collection sleeve (2) on the liquid collection tube (1); During sampling, the liquid collection sleeve (2) is installed at the first position on the liquid collection tube (1), and the bottom of the liquid collection tube (1) pushes open the flexible valve (3) and extends to the bottom of the protective part (2_3); when sampling stops, the liquid collection sleeve (2) is installed at the second position on the liquid collection tube (1), the liquid outlet (1_2) is retracted inside the liquid collection sleeve (2), and the flexible valve (3) is in a closed state; the second position is located below the first position.

2. The sampling device as described in claim 1, characterized in that, The sleeve adjustment assembly (4) includes: an elastic collar (5), a sleeve (8), an adjusting screw (6), and an adjusting belt (7); The sleeve (8) is fixedly embedded inside the joint (2_2), and the central axis of the sleeve (8) is perpendicular to the central axis of the liquid collection sleeve (2); The adjusting screw (6) includes a screw rod (6_1) and a screw head (6_2); the screw rod (6_1) is located inside the sleeve (8) and is threadedly connected to the sleeve (8); the screw head (6_2) is located outside the liquid extraction sleeve (2); The elastic collar (5) has a C-shaped structure, which is located inside the joint (2_2) and sleeved on the liquid collection tube (1); the opening of the C-shaped structure faces the sleeve (8); along the circumferential direction of the elastic collar (5), a first channel is provided inside the elastic collar (5); the middle part of the adjusting band (7) passes through the first channel, and both ends of the adjusting band (7) extend to the outside of the elastic collar (5) and are connected to the end face of the screw (6_1).

3. The sampling device as described in claim 1, characterized in that, It also includes a sealing plug (11) for sealing the sampling bottle (16); the sealing plug (11) has an assembly hole (13); during sampling, the bottom of the liquid collection tube (1) passes through the assembly hole (13), and the liquid outlet (1_2) is located inside the sampling bottle (16).

4. The sampling device as described in claim 3, characterized in that, The inner wall of the assembly hole (13) is provided with multiple elastic protrusions (14).

5. The sampling device as described in claim 3, characterized in that, The sealing plug (11) has a frustum-shaped structure that is larger at the top and smaller at the bottom.

6. The sampling device as described in claim 3, characterized in that, Along the circumferential direction of the sealing plug (11), an annular groove (15) is formed on the outer side wall of the top of the sealing plug (11).

7. The sampling device as described in claim 3, characterized in that, Also includes: The pressure-reducing guide tube (12) passes through the sealing plug (11) and connects the internal environment of the sampling bottle (16) to the atmospheric environment.

8. The sampling device as described in claim 1, characterized in that, The gripping part (2_1) has a trumpet-shaped structure that is larger at the top and smaller at the bottom.

9. The sampling device as described in claim 5, characterized in that, The connecting part has a spherical structure.

10. The sampling device as described in claim 3, characterized in that, The sealing plug (11), the liquid collection tube (1), the liquid collection sleeve (2), and the sleeve adjustment assembly (4) are all made of perfluoroalkoxy resin.

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