Underground water sampling device

Abstract

The utility model relates to an underground water sampling device which comprises a pipe body with an opening at one end and a hollow structure, a sampling hole communicated with the inner side and the outer side of the pipe body is formed in the end wall of the closed end of the pipe body, a water stop plug is slidably connected in the pipe body along the axial direction of the pipe body, and a gap is formed between the side wall of the water stop plug and the inner circular surface of the pipe body; an elastic supporting piece is arranged between the water stop plug and the pipe body, the water stop plug abuts against the closed end of the pipe body when the elastic supporting piece is in a natural stretching state, and the sampling hole is covered and blocked by the water stop plug. The utility model relates to a water seepage hole sealing device, and aims to solve the problems that in the prior art, a water seepage hole is blocked only by the gravity action of a small water stopping ball, the small water stopping ball is difficult to be tightly attached to and block the water seepage hole under the conditions that the Beller pipe inclines or shakes and the like, a water sample in the Beller pipe is moved out, and the collected water sample is lost in the ascending process of the Beller pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to underground water detection technical field, concretely relates to underground water sampling device. BACKGROUND

[0002] Underground water detection mainly concerns underground water level, water quality, supply attenuation and underground water dynamic change etc., provides scientific basis for the rational use and protection of underground water resources. Through detection, can find underground water pollution, overexploitation etc. in time, and take corresponding measures to govern and protect. Among them, water quality detection is the key link in water resources management and environmental protection, it involves the comprehensive monitoring and evaluation of the type, concentration and water quality condition of harmful substances in underground water.

[0003] In prior art, the bell tube is a common equipment for underground water sampling, and its sampling method is as follows:

[0004] Preparation stage: check the integrity of the bell tube, including whether the accessories (such as nylon rope, water outlet nozzle, etc.) are complete. Ensure that the length of the nylon rope is sufficient to reach the required sampling depth.

[0005] Tethering: tie the nylon rope tightly at the upper end of the bell tube, and ensure firm connection.

[0006] Lowering into the well: slowly put the bell tube into the water well until the specified depth is reached. In this process, the water stop ball in the tube (if any) will slightly float upward under the action of water pressure, water enters the bell tube from the bottom seepage hole, and the air in the bell tube is discharged from the upper end air hole.

[0007] Sampling: after the bell tube reaches the specified depth, stand for a period of time (such as 10 seconds), and then pull it up. At this time, the water stop ball blocks the seepage hole due to the action of gravity and water pressure in the tube, preventing water sample from flowing out.

[0008] Water guiding: connect the water guide pipe with the upper end air hole of the bell tube, manually invert the bell tube to guide the water sample into the water quality sampling bottle, and complete the sampling.

[0009] However, during the rising process of the bell tube, only the water stop ball itself relies on the gravity to block the seepage hole, and under the condition of inclination or shaking of the bell tube, the water stop ball is difficult to closely adhere to block the seepage hole, and there is a phenomenon of water sample moving out of the bell tube, resulting in loss of collected water sample. UTILITY MODEL CONTENTS

[0010] Therefore, the utility model aims to provide an underground water sampling device to solve the problem that in prior art, only the water stop ball itself relies on the gravity to block the seepage hole during the rising process of the bell tube, and under the condition of inclination or shaking of the bell tube, the water stop ball is difficult to closely adhere to block the seepage hole, and there is a phenomenon of water sample moving out of the bell tube, resulting in loss of collected water sample.

[0011] The utility model discloses a following technical scheme realizes:

[0012] A groundwater sampling device, including the pipe body of one end opening hollow structure, the end wall of the closed end of pipe body is equipped with the sampling hole of the communication pipe body inside and outside two sides, the water stop plug is slidably connected along the pipe body axial in the pipe body, and the gap is formed between the lateral wall of water stop plug and the inner circular surface of pipe body,

[0013] The elastic supporting piece is arranged between the water stop plug and the pipe body, the water stop plug abuts against the closed end of the pipe body in the natural extension state of the elastic supporting piece, and the water stop plug covers and blocks the sampling hole.

[0014] Further, the water stop plug is coaxial with the pipe body in a cylindrical shape, the diameter of the water stop plug is greater than the hole diameter of the sampling hole, and the end face of the water stop plug facing the sampling hole is parallel to the end face of the closed end of the pipe body.

[0015] Further, the water stop plug is provided with a slide rod at one end facing the sampling hole, one end of the slide rod is fixedly connected with the water stop plug, and the other end is inserted into the sampling hole and is in sliding fit;

[0016] The outer circular surface of the slide rod is provided with a water guide groove extending axially and penetrating through the pipe body, and the water guide groove is in communication with the inside and outside of the pipe body when the end face of the water stop plug and the closed end of the pipe body is out of contact.

[0017] Further, the axial length value of the sampling hole is less than the axial length value of the slide rod.

[0018] Further, the water stop plug is provided with a support disc coaxial with the pipe body at one end away from the sampling hole, the support disc is connected with the pipe body, and the support disc is in communication with the two sides along the axial direction of the pipe body.

[0019] The elastic supporting piece is a compression spring coaxial with the pipe body, one end of the compression spring abuts against the support disc, and the other end abuts against the water stop plug.

[0020] Further, a groove matched with the outer diameter of the compression spring is formed at one end of the water stop plug away from the sampling hole, and one end of the compression spring is embedded in the groove.

[0021] Further, the inner circular surface of the pipe body is provided with a sliding groove extending axially and penetrating through the opening end of the pipe body, and the sliding groove is provided with a sliding block.

[0022] One end of the sliding block is in sliding fit with the sliding groove along the axial direction of the pipe body, the other end of the sliding block protrudes out of the sliding groove and is fixedly connected with the outer circular surface of the support disc, and the support disc is provided with an adjusting part for driving the support disc to move in the pipe body.

[0023] Further, the pipe body opening end is detachably connected with a pipe cover, the adjusting part comprises a lead screw parallel to the pipe body, one end of the lead screw penetrates through the support disc and is connected with the support disc through thread cooperation, the other end penetrates through the pipe cover and extends out of the pipe body and is rotationally connected with the pipe body.

[0024] Further, the support disc is in the shape of a ring, the inner diameter of the support disc is smaller than the inner diameter of the compression spring, and the outer circular surface of the support disc is attached to the inner circular surface of the pipe body.

[0025] Further, the pipe body is made of transparent material, and the scale lines uniformly arranged along the axial direction of the pipe body are arranged on the outer circular surface of the pipe body at positions opposite to the sliding grooves.

[0026] The beneficial effects of the utility model lie in:

[0027] The underground water sampling device uses the elastic supporting member to apply a pushing force along the axial direction of the pipe body to the stopper, and through the combined action of the pushing force and the gravity of the stopper, the stopper is tightly attached to the end wall of the closed end of the pipe body, covering the sampling hole, and when the pipe body is inclined or swings, the elastic supporting member hinders the stopper from moving along the axial direction of the pipe body in the pipe body, reduces the risk of the sampling hole being opened, and hinders the water sample in the pipe body from flowing out.

[0028] Other advantages, objects, and features of the utility model will be set forth in the following description, and to some extent, will be obvious to those skilled in the art based on the following description, or can be learned from the practice of the utility model. The objects and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic view of the utility model embodiment;

[0030] Figure 2 It is a plane structural schematic view of the utility model embodiment;

[0031] Figure 3 It is a three-dimensional structural schematic view of the pipe body in the utility model embodiment;

[0032] Figure 4 It is a three-dimensional structural schematic view of the pipe cover in the utility model embodiment;

[0033] Figure 5 It is a three-dimensional structural schematic view of the support disc in the utility model embodiment;

[0034] Figure 6 It is a three-dimensional structural schematic view of the stopper in the utility model embodiment;

[0035] Figure 7 Position Figure 2Cross-sectional view along A-A.

[0036] In the figure: 1, pipe body; 11, sampling hole; 12, chute; 13, scale; 2, water stop plug; 21, groove; 3, slide bar; 31, water guide groove; 4, support disc; 41, sliding block; 5, compression spring; 6, pipe cover; 61, lifting ring; 7, screw rod. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0039] It should be noted that: similar numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the above description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "one side", "the other side" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, the term "same" and other terms do not mean that the components must be absolutely the same, but there can be slight differences. The term "vertical" only means that the position relationship between the components is more vertical than "parallel", and does not mean that the structure must be completely vertical, but can be slightly inclined.

[0042] Please refer to Figures 1-7The utility model provides a technical scheme: a groundwater sampling device, including the pipe body 1 of one end opening presents the hollow structure, the end wall of the closed end of pipe body 1 is equipped with the sampling hole 11 of the communication pipe body 1 inside and outside two sides, the water stop plug 2 of sliding connection has in the pipe body 1 along the pipe body 1 axial direction, and the gap between the lateral wall of water stop plug 2 and pipe body 1 inner circle surface has,

[0043] The elastic support between water stop plug 2 and pipe body 1 is provided with, and water stop plug 2 and pipe body 1 closed end are abutted when the natural extension state of elastic support, and water stop plug 2 covers and blocks sampling hole 11.

[0044] In the scheme, the elastic support is used to apply the thrust along the axial direction of pipe body 1 to water stop plug 2, and the thrust and gravity of water stop plug 2 jointly act to make water stop plug 2 closely adhere to the end wall of the closed end of pipe body 1, cover sampling hole 11, and when pipe body 1 is inclined or swings, the elastic support hinders water stop plug 2 from moving in the axial direction of pipe body 1 in pipe body 1, reduces the risk of sampling hole 11 being opened, and hinders water sample from flowing out of pipe body 1.

[0045] In addition, water stop plug 2 and pipe body 1 are connected along the axial direction of pipe body 1 to make water stop plug 2 only be able to slide in pipe body 1 along the axial direction of pipe body 1 in single degree of freedom, that is, slide close to or away from the end wall of the closed end of pipe body 1, form the closed state (water stop plug 2 covers and blocks sampling hole 11) and the open state of sampling hole 11.

[0046] Among them, the elastic support has the elastic supporting effect to water stop plug 2, and when the elastic support is installed in pipe body 1, the elastic support is in the compressed state, the elastic force of the elastic support is used as the thrust to water stop plug 2, so that water stop plug 2 stably adheres to the end wall of the closed end of pipe body 1.

[0047] When using, the following steps are used:

[0048] Step 1, the open end of pipe body 1 is bound to the lifting rope, so that when the lifting rope lifts pipe body 1, the closed end of pipe body 1 is vertically downward, and sampling hole 11 is in the closed state;

[0049] Step 2, the closed end of pipe body 1 is inserted into the water well, the lifting rope is held and pipe body 1 is slowly put down until sampling hole 11 moves to the specified depth under water;

[0050] Step 3, when the water pressure near sampling hole 11 applies upward external force to water stop plug 2 greater than the sum of the gravity of water stop plug 2 and the elastic force of the elastic support, water stop plug 2 slightly floats upward in pipe body 1, sampling hole 11 is in the open state, water enters the pipe from sampling hole 11, and air in the pipe is discharged from the upper end opening.

[0051] Step 4, manually pull the lifting rope upward to move the tube body 1 upward, and when the water pressure near the sampling hole 11 exerts an upward external force on the water stop plug 2 smaller than the sum of the gravity of the water stop plug 2 and the elastic force of the elastic support, the water stop plug 2 moves downward in the tube body 1 and abuts against the end wall of the closed end of the tube body 1, the sampling hole 11 is in a closed state, the water sample is blocked from flowing out, and the sampling work is completed.

[0052] In this embodiment, the water stop plug 2 is in a cylindrical shape coaxial with the tube body 1, the diameter of the water stop plug 2 is greater than the hole diameter of the sampling hole 11, and the end face of the water stop plug 2 facing the sampling hole 11 is parallel to the end face of the closed end of the tube body 1.

[0053] In this scheme, the diameter of the water stop plug 2 is greater than the hole diameter of the sampling hole 11, which limits the water stop plug 2 from moving out of the sampling hole 11 to the outside of the tube body 1; by using the flat end of the water stop plug 2 to abut against the end face of the closed end of the tube body 1, and the axis of the sampling hole 11 overlaps with the axis of the water stop plug 2, the water stop plug 2 can completely cover the open end of the sampling hole 11, achieving the purpose of covering and plugging the sampling hole 11.

[0054] In this embodiment, a sliding rod 3 is arranged at one end of the water stop plug 2 facing the sampling hole 11, one end of the sliding rod 3 is fixedly connected with the water stop plug 2, and the other end is inserted into the sampling hole 11 and slidably connected.

[0055] A water guide groove 31 extending through the sliding rod 3 is arranged on the outer circular surface of the sliding rod 3, and when the water stop plug 2 is separated from the end face of the closed end of the tube body 1, the water guide groove 31 is in communication with the inside and outside of the tube body 1.

[0056] In this scheme, one end of the sliding rod 3 is inserted into the sampling hole 11 and slidably connected, and since the axis of the sampling hole 11 overlaps with the axis of the water stop plug 2, the water stop plug 2 can only slide along the axis of the tube body 1 in the tube body 1 with single degree of freedom.

[0057] The overlapping part of the water guide groove 31 and the sampling hole 11 is used as a channel for water flow in and out of the tube body 1, and when the sampling hole 11 is in a closed state, the channel is closed, and when the sampling hole 11 is in an open state, the channel is opened.

[0058] In this embodiment, the axial length of the sampling hole 11 is less than the axial length of the sliding rod 3.

[0059] In this scheme, when the sampling hole 11 is in a closed state, one end of the sliding rod 3 protrudes out of the tube body 1, and when water needs to be guided, the closed end of the tube body 1 is only needed to be inserted into the inside of the sampling bottle, and the sliding rod 3 is abutted against the inner bottom wall of the sampling bottle, the gravity of the tube body 1 and the water sample in the tube body 1 or the tube body 1 is manually pressed downward to make the tube body 1 move downward relative to the sliding rod 3, the sampling hole 11 is in an open state, and the water sample in the tube body 1 flows smoothly into the sampling bottle, completing the water guiding work, without the need for complicated operations such as installing and removing the water guiding pipe and inverting the tube body 1, simplifying the work steps and improving the work efficiency.

[0060] In the embodiment, the water stop plug 2 is provided with a support disc 4 coaxial with the pipe body 1 at the end away from the sampling hole 11, the support disc 4 is connected with the pipe body 1, and the support disc 4 is connected with the pipe body 1 along the axial direction of the pipe body 1.

[0061] The elastic support is a compression spring 5 coaxial with the pipe body 1, one end of the compression spring 5 abuts against the support disc 4, and the other end abuts against the water stop plug 2.

[0062] In the scheme, the mounting disc is fixedly installed in the pipe body 1 to rigidly support the compression spring 5, the axial line of the compression spring 5 overlaps the axial line of the pipe body 1, and the purpose of applying an axial pushing force to the water stop plug 2 along the pipe body 1 is achieved.

[0063] In the embodiment, the water stop plug 2 is provided with a groove 21 with an outer diameter matched with that of the compression spring 5 at the end away from the sampling hole 11, and one end of the compression spring 5 is embedded in the groove 21.

[0064] In the scheme, the groove 21 is used to limit the radial movement of the compression spring 5 on the water stop plug 2, and the connection stability between the compression spring 5 and the water stop plug 2 is improved.

[0065] In the embodiment, a sliding groove 12 extending through the pipe body 1 along the axial direction of the pipe body 1 is formed on the inner circular surface of the pipe body 1, and a sliding block 41 is arranged in the sliding groove 12.

[0066] One end of the sliding block 41 is in sliding fit with the sliding groove 12 along the axial direction of the pipe body 1, the other end of the sliding block 41 protrudes out of the sliding groove 12 and is fixedly connected with the outer circular surface of the support disc 4, and an adjusting part for driving the support disc 4 to move in the pipe body 1 is arranged between the support disc 4 and the pipe body 1.

[0067] In the scheme, the sliding block 41 and the sliding groove 12 are used to slidably connect the support disc 4 with the pipe body 1, so that the support disc 4 can move in the pipe body 1 along the axial direction of the pipe body 1 with one degree of freedom, and thus the position of the support disc 4 can be adjusted by driving the support disc 4 to move in the pipe body 1 by the adjusting part, the distance between the support disc 4 and the water stop plug 2 is changed, that is, the deformation amount of the compression spring 5 when being initially compressed is changed, and the pushing force applied by the compression spring 5 to the water stop plug 2 when the sampling hole 11 is in the closed state is controlled.

[0068] The pushing force applied by the compression spring 5 to the water stop plug 2 can be obtained by measuring the deformation amount of the compression spring 5 and then calculating.

[0069] In addition, the liquid pressure calculation formula is p=pg h (p is the pressure, p is the liquid density, the density of water is 1*10^3 kg / m^3, g is the acceleration of gravity, and the value is 9.8 N / kg, and h is the length of the sampling hole 11 from the water surface position to the sampling hole 11), so the pressure at the specified depth can be calculated, and the pressure can be indirectly obtained.

[0070] Therefore, the pressure at the specified depth can be calculated by pre-measurement, and the initial state of the compression spring 5 is adjusted to assist the adjustment of the elastic force, so that when the sampling hole 11 moves to the vicinity of the specified depth, the sampling hole 11 is automatically converted from the closed state to the open state, and the sampling work is performed, thereby reducing the sampling error.

[0071] In the embodiment, the pipe cover 6 is detachably connected to the open end of the pipe body 1, the adjusting part includes a lead screw 7 parallel to the pipe body 1, one end of the lead screw 7 penetrates the support disc 4 and is connected with the support disc 4 through thread cooperation, and the other end penetrates the pipe cover 6 and extends out of the pipe body 1 and is rotationally connected with the pipe body 1.

[0072] In the scheme, the pipe cover 6 can be inserted into the pipe body 1 by tight fitting or fixedly installed on the pipe body 1 by bolts and the like, so that the pipe cover 6 can be detached from the pipe body 1, so as to facilitate cleaning of the sampling device; the pipe cover 6 is fixedly connected with a lifting ring 61 for binding the lifting rope;

[0073] Meanwhile, the pipe cover 6 can cover the opening of the pipe body 1 to block the entry of large impurities into the pipe body 1 to pollute the water sample; the pipe cover 6 is provided with a notch at a position corresponding to the sliding groove 12, so that the sliding groove 12 serves as a channel for discharging air in the pipe body 1.

[0074] In addition, the outer dimensions of the lead screw 7 at both ends of the pipe cover 6 are greater than the diameter of the section located inside the pipe cover 6, which limits the movement of the lead screw 7 on the pipe cover 6 along the axial direction of the lead screw 7, and the pipe cover 6 supports the lead screw 7, and one end of the lead screw 7 protrudes out of the pipe body 1, so as to facilitate the rotation control of the lead screw 7, and in the case that the sliding block 41 and the sliding groove 12 limit the rotation of the support disc 4 around the axis of the pipe body 1, the movement of the support disc 4 is further controlled.

[0075] In the embodiment, the support disc 4 is annular, the inner diameter of the support disc 4 is smaller than the inner diameter of the compression spring 5, and the outer circular surface of the support disc 4 is attached to the inner circular surface of the pipe body 1.

[0076] In the scheme, the support disc 4 is annular, which achieves the purpose of connecting the support disc 4 along the axial direction of the pipe body 1, so that the water sample can smoothly pass through the support disc 4; the inner diameter of the support disc 4 is smaller than the inner diameter of the compression spring 5, which limits the compression spring 5 from passing through the middle of the support disc 4; the outer circular surface of the support disc 4 is attached to the inner circular surface of the pipe body 1, which can scrape and clean the impurities adhering to the inner circular surface of the pipe body 1 when the support disc 4 moves in the pipe body 1.

[0077] Therefore, when the sampling device needs to be cleaned, the pipe cover 6 is only removed, and the pipe cover 6 is pushed back and forth along the axial direction of the pipe body 1, so that the support disc 4 is driven by the lead screw 7 to move, and the cleaning work is performed, which is simple and convenient to operate.

[0078] In the embodiment, the pipe body 1 is made of transparent material, and the scale lines 13 are uniformly arranged on the outer circumferential surface of the pipe body 1 in the axial direction of the pipe body 1.

[0079] In the scheme, the pipe body 1 can be made of transparent material such as acrylic and glass, so as to observe the sampling condition of the water sample in the pipe body 1 and the movement of the sliding block 41. Meanwhile, the scale lines 13 are arranged on the outer circumferential surface of the pipe body 1, so as to intuitively and quickly obtain the movement distance of the sliding block 41 and assist in adjusting the position of the support disc 4.

[0080] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A groundwater sampling device, comprising a hollow tube (1) with one open end, wherein the closed end of the tube (1) has a sampling hole (11) connecting the inside and outside of the tube (1), characterized in that: A water-stop plug (2) is slidably connected inside the pipe body (1) along the axial direction of the pipe body (1), and there is a gap between the side wall of the water-stop plug (2) and the inner circular surface of the pipe body (1). An elastic support is provided between the water stop plug (2) and the pipe body (1). When the elastic support is in its naturally extended state, the water stop plug (2) abuts against the closed end of the pipe body (1), and the water stop plug (2) covers and blocks the sampling hole (11). The water stop plug (2) is provided with a support plate (4) coaxial with the tube body (1) at one end facing away from the sampling hole (11). The support plate (4) is connected to the tube body (1), and the support plate (4) is connected to both sides along the axial direction of the tube body (1). The elastic support is a compression spring (5) coaxial with the tube body (1). One end of the compression spring (5) abuts against the support plate (4), and the other end abuts against the water stop plug (2). The water stop plug (2) has a groove (21) that matches the outer diameter of the compression spring (5) at one end facing away from the sampling hole (11), and one end of the compression spring (5) is embedded in the groove (21). The inner circular surface of the tube (1) is provided with a sliding groove (12) that extends through the tube (1) along the axial direction toward the opening end of the tube (1), and a slider (41) is provided in the sliding groove (12). One end of the slider (41) is slidably engaged with the slide groove (12) along the axial direction of the tube body (1), and the other end protrudes out of the slide groove (12) and is fixedly connected to the outer circular surface of the support plate (4). An adjustment part for driving the support plate (4) to move inside the tube body (1) is provided between the support plate (4) and the tube body (1).

2. The groundwater sampling device according to claim 1, characterized in that: The water stop plug (2) is cylindrical and coaxial with the tube body (1). The diameter of the water stop plug (2) is larger than the diameter of the sampling hole (11), and the end face of the water stop plug (2) facing the sampling hole (11) is parallel to the end face of the closed end of the tube body (1).

3. The groundwater sampling device according to claim 2, characterized in that: The water-stop plug (2) is provided with a slide rod (3) at one end facing the sampling hole (11). One end of the slide rod (3) is fixedly connected to the water-stop plug (2), and the other end is inserted into the sampling hole (11) and slidably engaged. The slide bar (3) has a water channel (31) extending through the pipe body (1) axially on its outer circular surface. When the water stop plug (2) is out of contact with the end face of the closed end of the pipe body (1), the water channel (31) connects the inner and outer sides of the pipe body (1).

4. The groundwater sampling device according to claim 3, characterized in that: The axial length of the sampling hole (11) is less than the axial length of the slide bar (3).

5. The groundwater sampling device according to claim 1, characterized in that: The tube body (1) has a detachable tube cap (6) inside the open end. The adjustment part includes a screw rod (7) parallel to the tube body (1). One end of the screw rod (7) passes through the support plate (4) and is connected to the support plate (4) by a threaded engagement. The other end passes through the tube cap (6), extends out of the tube body (1), and is rotatably engaged with the tube body (1).

6. The groundwater sampling device according to claim 1, characterized in that: The support plate (4) is circular, and the inner diameter of the support plate (4) is smaller than the inner diameter of the compression spring (5). The outer circular surface of the support plate (4) is in contact with the inner circular surface of the tube body (1).

7. The groundwater sampling device according to claim 1, characterized in that: The tube (1) is made of transparent material, and scale lines (13) are evenly arranged in the axial direction of the tube (1) on the outer circular surface of the tube (1) relative to the slide groove (12).

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