Underground water sampling device

Abstract

The invention relates to the technical field of sampling devices, in particular to an underground water sampling device which comprises a positioning ring, an installation ring, a supporting assembly, a sampling barrel, a protection assembly and an adjusting assembly, when the positioning ring reaches a sampling water layer, the adjusting assembly adjusts the distance between the installation ring and the positioning ring, and when the installation ring and the positioning ring are close, the supporting assembly is arranged. The first supporting rods and the second supporting rods of the multiple adjusting assemblies are converted from the first state to the second state at the same time, the protection assembly relieves blocking of water entering the sampling barrel, meanwhile, impurities in underground water can be prevented from entering the sampling barrel through the protection assembly, it is ensured that a water sample entering the sampling barrel has representativeness, and meanwhile the sampling efficiency is improved. After the sampling barrel reaches the sampling water layer, water can penetrate through the protection assembly to enter the sampling barrel, underground water of different levels is prevented from entering the same sampling barrel, and then it is ensured that the collected water sample has enough representativeness.

Description

Technical Field

[0001] The invention relates to the technical field of sampling devices, and in particular to a groundwater sampling device. Background Art

[0002] Groundwater sampling is of vital importance in many fields such as environmental monitoring, geological exploration and water resources research. The accuracy of its data plays a key supporting role in understanding the quality of groundwater resources and geochemical characteristics.

[0003] In the existing groundwater sampling process, the underground environment is extremely complex and filled with various debris, such as mud, rock fragments, etc. Once these debris enter the sampling tube, they will interfere with the purity of the sample and affect the subsequent accurate analysis and detection of various components in the water sample. In addition, in the existing groundwater sampling process, groundwater at different levels often has differences in physical and chemical properties, such as mineral content, pH, dissolved oxygen, etc. When the water inlet of the existing sampling device is opened, the water above and below the sampling point will converge to the sampling point at the same time. This disordered convergence will make the collected water sample composition chaotic and unable to accurately represent the actual situation of groundwater at a specific level, affecting the scientific evaluation and rational development and utilization of groundwater resources. Summary of the invention

[0004] The invention provides a groundwater sampling device to solve the problem that the water samples collected by the existing sampling device have low representativeness.

[0005] A groundwater sampling device of the present invention adopts the following technical solution: A groundwater sampling device comprises a positioning ring, a mounting ring, a supporting assembly, a sampling tube, a protective assembly and an adjusting assembly.

[0006] The mounting ring and the positioning ring are coaxially arranged at intervals, and the distance between the mounting ring and the positioning ring can be changed; there are multiple groups of support assemblies, each group of support assemblies includes a first support rod and a second support rod, the first support rod is hinged to the positioning ring, the second support rod is hinged to the mounting ring, the first support rod is hinged to the second support rod, the first support rod and the second support rod have a first state in the same vertical line and a second state with an angle; the sampling cylinder is arranged on the mounting ring, the sampling cylinder has an opening facing the positioning ring, and a sealing cover is arranged on the positioning ring, and when the mounting ring and the positioning ring are close, the sealing cover can block the opening of the sampling cylinder; the protective assembly is used to prevent water from entering the interior of the sampling cylinder when the first support rod and the second support rod are in the first state; the protective assembly can also remove the obstruction of water from entering the interior of the sampling cylinder when the first support rod and the second support rod are in the second state; the adjustment assembly is used to adjust the distance between the mounting ring and the positioning ring after the positioning ring reaches the sampling water layer.

[0007] Furthermore, the protective assembly includes a protective cloth, which is fixedly connected to the first support rod and the second support rod of the multiple groups of support assemblies at the same time, and a plurality of liquid inlet holes are arranged on the protective cloth; when the first support rod and the second support rod are in a first state in the same vertical line, the protective cloth is in a stacked state, and the liquid inlet holes are blocked by the protective cloth itself.

[0008] Furthermore, the adjustment assembly includes a first adjustment unit and a second adjustment unit, the first adjustment unit is used to adjust the positioning ring and the mounting ring to be closer to each other, and the second adjustment unit is used to adjust the positioning ring and the mounting ring to be farther away from each other.

[0009] Furthermore, the first adjustment unit includes a first positioning sleeve and a first adjustment rope. The first positioning sleeve is fixedly connected to the positioning ring. The first adjustment rope is slidably arranged inside the first positioning sleeve. The end of the first adjustment rope is connected to the mounting ring. The first adjustment rope can move relative to the first positioning sleeve.

[0010] Furthermore, the second adjustment unit includes a second positioning sleeve, a second adjustment rope and an adjustment sleeve, the adjustment sleeve is arranged above the positioning ring, and the inner diameter of the adjustment sleeve is equal to the outer diameter of the positioning ring; the second positioning sleeve is fixedly connected to the adjustment sleeve, the second adjustment rope is slidably arranged inside the second positioning sleeve, the end of the second adjustment rope is fixedly connected to the positioning ring, and the second adjustment rope can move relative to the second positioning sleeve.

[0011] Furthermore, the adjustment assembly also includes a traction member, which is used to pull the first adjustment rope to move relative to the first positioning sleeve and to pull the second adjustment rope to move relative to the second positioning sleeve.

[0012] Furthermore, the traction member includes a positioning plate, a first reel and a second reel. The positioning plate can be placed on the ground, the first positioning sleeve and the second positioning sleeve can be fixed to the positioning plate, and the first reel and the second reel are both fixedly connected to the positioning plate; the first reel can reel in or unreel the first adjustment rope; the second reel can reel in or unreel the second adjustment rope.

[0013] Furthermore, a connecting sleeve is provided on the mounting ring, and the sampling tube can be slidably mounted in the connecting sleeve, and the opening of the sampling tube when installed in the connecting sleeve faces the positioning ring.

[0014] Furthermore, a blocking ring is provided at the opening of the sampling tube, and a buckle is provided on the blocking cover. When the mounting ring and the positioning ring are close to each other, the buckle on the blocking cover fits with the blocking ring.

[0015] Furthermore, a rubber ring is provided on the outer side wall of the sampling tube.

[0016] The beneficial effects of the present invention are as follows: a groundwater sampling device of the present invention comprises a positioning ring, a mounting ring, a support assembly, a sampling barrel, a protective assembly and an adjustment assembly; when sampling groundwater, the first support rods and the second support rods of the plurality of support assemblies are all in a first state of the same vertical line, the protective assembly is in a state of blocking water from entering the interior of the sampling barrel, when the positioning ring reaches the sampling water layer, the adjustment assembly adjusts the distance between the mounting ring and the positioning ring, when the mounting ring and the positioning ring are close, the first support rods and the second support rods of the plurality of adjustment assemblies simultaneously change from the first state to the second state, and the protective assembly removes the obstruction to water from entering the interior of the sampling barrel, and at the same time, the protective assembly can prevent debris in the groundwater from entering the sampling barrel, thereby ensuring that the water sample entering the sampling barrel is representative, and at the same time, only after the sampling barrel reaches the sampling water layer can water pass through the protective assembly and enter the interior of the sampling barrel, thereby avoiding the occurrence of groundwater of different levels entering the same sampling barrel, thereby ensuring that the collected water sample is sufficiently representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structure of a groundwater sampling device provided by an embodiment of the present invention; Figure 2 A schematic diagram of the cross-section structure of a groundwater sampling device provided by an embodiment of the present invention; Figure 3 for Figure 2 A partial enlarged view of the middle A; Figure 4 for Figure 2 A partial enlarged view of point B in the middle; Figure 5 A state diagram of a groundwater sampling device provided by an embodiment of the present invention when the distance between a positioning ring and a mounting ring gradually approaches; Figure 6 A state diagram when the distance between a positioning ring and a mounting ring in a groundwater sampling device provided by an embodiment of the present invention reaches a minimum.

[0019] In the figure: 110, positioning ring; 120, mounting ring; 130, first support rod; 140, second support rod; 150, hinge groove; 210, sampling tube; 220, protective cloth; 240, first positioning sleeve; 250, first adjusting rope; 260, second positioning sleeve; 270, second adjusting rope; 280, adjusting sleeve; 310, connecting sleeve; 320, sealing ring; 330, buckle. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] like Figures 1 to 6 As shown, an embodiment of the present invention provides a groundwater sampling device, which includes a positioning ring 110, a mounting ring 120, a support assembly, a sampling tube 210, a protection assembly and an adjustment assembly.

[0024] The axis of the positioning ring 110 is vertically arranged; the installation ring 120 is the same size as the positioning ring 110, and the installation ring 120 and the positioning ring 110 are coaxially arranged with an interval up and down, wherein the positioning ring 110 is arranged above the installation ring 120, and the positioning ring 110 can sense the position of the water layer in which it is located. For example, a water pressure sensor is arranged on the positioning ring 110. When the positioning ring 110 reaches different depths, the water pressure sensor on the positioning ring 110 can sense the corresponding pressure, thereby obtaining the position of the water layer in which it is located. The distance between the installation ring 120 and the positioning ring 110 can change. In the initial state, the distance between the installation ring 120 and the positioning ring 110 is the largest.

[0025] There are multiple groups of support components, and the multiple groups of support components are evenly distributed around the circumference of the positioning ring 110. Each group of support components includes a first support rod 130 and a second support rod 140. The first support rod 130 is hinged to the positioning ring 110, and the second support rod 140 is hinged to the mounting ring 120. Specifically, the positioning ring 110 and the mounting ring 120 are both provided with multiple hinge grooves 150. One end of the first support rod 130 is hinged in a hinge groove 150 of the positioning ring 110, and the other end of the second support rod 140 is hinged in a hinge groove 150 of the mounting ring 120. The first support rod 130 and the second support rod 140 are hinged, and the first support rod 130 and the second support rod 140 have a first state of being in the same vertical line and a second state of having an angle. In the initial state, the mounting ring 120 and the positioning ring 110 are in a state of maximum distance, and the first support rod 130 and the second support rod 140 are in the first state of being in the same vertical line.

[0026] The sampling barrel 210 is arranged on the mounting ring 120, and has an opening facing the positioning ring 110. The positioning ring 110 is provided with a blocking cap, and when the mounting ring 120 and the positioning ring 110 are close to each other, the blocking cap can block the opening of the sampling barrel 210; in the initial state, the opening of the sampling barrel 210 is in an open state.

[0027] The protection component is used to prevent water from entering the sampling barrel 210 when the first support rod 130 and the second support rod 140 are in the first state. At the same time, the protection component can prevent debris in the groundwater from entering the sampling barrel 210; the protection component can also remove the obstruction to water from entering the sampling barrel 210 when the first support rod 130 and the second support rod 140 are in the second state. When the first support rod 130 and the second support rod 140 are in the second state, the distance between the positioning ring 110 and the mounting ring 120 gradually approaches. When the sealing cover on the positioning ring 110 blocks the opening on the sampling barrel 210, the angle between the first support rod 130 and the second support rod 140 reaches a limit angle. At this time, under the action of the sealing cover, water is prevented from continuing to enter the sampling barrel 210, or the water inside the sampling barrel 210 is prevented from flowing outward.

[0028] The adjustment component is used to adjust the distance between the mounting ring 120 and the positioning ring 110 after the positioning ring 110 reaches the sampling water layer. When sampling the sampling water layer, first, the positioning ring 110 is transported to the groundwater. When the positioning ring 110 reaches the sampling water layer, the adjustment component adjusts the distance between the positioning ring 110 and the mounting ring 120 to gradually decrease until the sealing cover on the positioning ring 110 seals the opening on the sampling tube 210. Subsequently, the adjustment component adjusts the distance between the positioning ring 110 and the mounting ring 120 to gradually restore it to its initial state.

[0029] A groundwater sampling device of the present invention, when sampling groundwater, the first support rods 130 and the second support rods 140 of the multiple support assemblies are all in the first state of the same vertical line, the protective assembly is in the state of blocking water from entering the interior of the sampling tube 210, when the positioning ring 110 reaches the sampling water layer, the adjustment assembly adjusts the distance between the mounting ring 120 and the positioning ring 110, when the mounting ring 120 and the positioning ring 110 are close, the first support rods 130 and the second support rods 140 of the multiple adjustment assemblies are simultaneously transformed from the first state to the second state, and the protective assembly removes the obstruction of water from entering the interior of the sampling tube 210, and at the same time, the protective assembly can prevent debris in the groundwater from entering the sampling tube 210, ensuring that the water sample entering the sampling tube 210 is representative, and at the same time, after the sampling tube 210 reaches the sampling water layer, water can pass through the protective assembly to enter the interior of the sampling tube 210, avoiding the occurrence of groundwater of different levels entering the same sampling tube 210, thereby ensuring that the collected water sample is sufficiently representative.

[0030] In one embodiment, the protective assembly includes a protective cloth 220, which is fixedly connected to the first support rod 130 and the second support rod 140 of the plurality of support assemblies at the same time, the upper end of the protective cloth 220 is fixedly connected to the positioning ring 110, and the lower end of the protective cloth 220 is fixedly connected to the mounting ring 120. The protective cloth 220 is cylindrical, and a plurality of liquid inlet holes are provided on the protective cloth 220. Specifically, the plurality of liquid inlet holes can be evenly divided into a plurality of groups, and the plurality of groups of liquid inlet holes are evenly distributed around the circumference of the protective cloth 220. The number of the plurality of groups of liquid inlet holes is the same as the number of the plurality of support assemblies, and each group of liquid inlet holes is evenly distributed along the vertical direction of the protective cloth 220. When the first support rod 130 and the second support rod 140 are in the first state of being in the same vertical line, the protective cloth 220 is in a stacked state, and the liquid inlet holes are blocked by the protective cloth 220 itself. Furthermore, when the first support rod 130 and the second support rod 140 are in the second state, and the angle between the first support rod 130 and the second support rod 140 reaches the limit state, the protective cloth 220 is lifted up by the plurality of first support rods 130 and the plurality of second support rods 140, and the protective cloth 220 is in a tensioned state. In the process of the protective cloth 220 being gradually tensioned, some of the liquid inlet holes on the protective cloth 220 are no longer blocked by themselves, and water enters the interior of the sampling tube 210 through the liquid inlet holes. When the protective cloth 220 is fully tensioned, the opening of the sampling tube 210 is blocked by the blocking cover.

[0031] In one embodiment, the adjustment assembly includes a first adjustment unit and a second adjustment unit, the first adjustment unit is used to adjust the positioning ring 110 and the mounting ring 120 to be closer to each other, and the second adjustment unit is used to adjust the positioning ring 110 and the mounting ring 120 to be farther away from each other. In the initial state, the positioning ring 110 and the mounting ring 120 are at the farthest distance. When the positioning ring 110 reaches the sampling water layer, the first adjustment unit adjusts the positioning ring 110 and the mounting ring 120 to be closer to each other. After the opening of the sampling tube 210 is blocked by the blocking cover, the second adjustment unit starts to adjust the positioning ring 110 and the mounting ring 120 to be farther away from each other.

[0032] In one embodiment, the first adjustment unit includes a first positioning sleeve 240 and a first adjustment rope 250. The first positioning sleeve 240 is fixedly connected to the positioning ring 110, and the first positioning sleeve 240 is in a state of penetrating the upper and lower end surfaces of the positioning ring 110. The first adjustment rope 250 is slidably arranged inside the first positioning sleeve 240, and the end of the first adjustment rope 250 is connected to the mounting ring 120. The first adjustment rope 250 can move relative to the first positioning sleeve 240. When the positioning ring 110 reaches the sampling water layer, the first positioning sleeve 240 is held, and then the first adjustment rope 250 is pulled to move relative to the first positioning sleeve 240, so that the positioning ring 110 remains relatively stationary, and the mounting ring 120 gradually approaches the positioning ring 110.

[0033] Furthermore, when the positioning ring 110 moves from the ground to the sampling water layer, the staff gradually loosens the first positioning sleeve 240 , and the staff determines whether the positioning ring 110 reaches the sampling water layer by the length of the loosened first positioning sleeve 240 .

[0034] In one embodiment, the second adjustment unit includes a second positioning sleeve 260, a second adjustment rope 270 and an adjustment sleeve 280. The adjustment sleeve 280 is coaxially arranged above the positioning ring 110. The inner diameter of the adjustment sleeve 280 is equal to the outer diameter of the positioning ring 110. The adjustment sleeve 280 can be sleeved on the outer side of the positioning ring 110. The second positioning sleeve 260 is fixedly connected to the adjustment sleeve 280, the second positioning sleeve 260 is arranged through the adjustment sleeve 280, the second adjustment rope 270 is slidably arranged inside the second positioning sleeve 260, the end of the second adjustment rope 270 is fixedly connected to the positioning ring 110, and the second adjustment rope 270 can move relative to the second positioning sleeve 260. In the initial state, there is a certain distance between the adjustment sleeve 280 and the positioning ring 110 in the vertical direction. After the opening of the sampling tube 210 is blocked by the blocking cover, the second positioning sleeve 260 is held, and then the second adjustment rope 270 is pulled to move relative to the second positioning sleeve 260, and the second adjustment rope 270 gradually pulls the positioning ring 110 to move inside the adjustment sleeve 280. When the positioning ring 110 enters the inside of the adjustment sleeve 280, the lower end of the adjustment sleeve 280 squeezes the first support rod 130 of the multiple support assemblies, so that the first support rod 130 and the second support rod 140 gradually switch to the first state. Further, in the process of switching the first support rod 130 and the second support rod 140 to the first state, the first positioning sleeve 240 and the second positioning sleeve 260 are pulled to move upward synchronously, so that the positioning ring 110, the mounting ring 120 and the sampling tube 210 are lifted out of the water.

[0035] In one embodiment, the adjustment assembly further includes a traction member, which is also used to pull the first adjustment rope 250 to move relative to the first positioning sleeve 240 and to pull the second adjustment rope 270 to move relative to the second positioning sleeve 260. Specifically, by providing the traction member, the work intensity of the staff is reduced, and the accuracy of controlling the first adjustment rope 250 and the second adjustment rope 270 is improved.

[0036] In one embodiment, the traction member includes a positioning plate, a first reel and a second reel. The positioning plate can be placed on the ground. The first positioning sleeve 240 and the second positioning sleeve 260 can be fixed to the positioning plate. Specifically, a clamp is provided on the positioning plate. When the staff relaxes the first positioning sleeve 240 and the second positioning sleeve 260, the clamp can clamp the first positioning sleeve 240 and the second positioning sleeve 260. The first reel and the second reel are both fixedly connected to the positioning plate; the first reel can reel or unreel the first adjustment rope 250; the second reel can reel or unreel the second adjustment rope 270. When the first reel is started, the first positioning sleeve 240 is in a state of being fixed by the clamp, and when the second reel is started, the second positioning sleeve 260 is in a state of being fixed by the clamp. Further, the clamp, the first reel and the second reel can be independently controlled by the staff, which improves the convenience of sampling.

[0037] In one of the embodiments, a connecting sleeve 310 is provided on the mounting ring 120, and the sampling tube 210 can be slidably installed in the connecting sleeve 310. When the sampling tube 210 is installed in the connecting sleeve 310, the opening thereof faces the positioning ring 110. In the initial state, the sampling tube 210 is installed in the connecting sleeve 310. After the opening of the sampling tube 210 is blocked by the blocking cover, when the positioning ring 110 and the mounting ring 120 move away from each other, the sampling tube 210 is separated from the connecting sleeve 310.

[0038] In one of the embodiments, a sealing ring 320 is provided at the opening of the sampling tube 210, and a buckle 330 is provided on the sealing cover. When the mounting ring 120 and the positioning ring 110 are close to each other, the buckle 330 on the sealing cover fits with the sealing ring 320. Specifically, by providing the buckle 330 and the sealing ring 320, the sealing performance of the sealing cover in sealing the opening of the sampling tube 210 is ensured.

[0039] In one embodiment, a rubber ring is provided on the outer wall of the sampling tube 210. When the sampling tube 210 and the connecting sleeve 310 move relative to each other, friction is generated between the rubber ring and the inner wall of the connecting sleeve 310, thereby preventing the sampling tube 210 from being separated from the connecting sleeve 310 when the positioning ring 110 sinks into the sampling water layer.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A groundwater sampling device, characterized in that: include: Positioning ring; A mounting ring, wherein the mounting ring and the positioning ring are coaxially arranged at intervals, and the distance between the mounting ring and the positioning ring can be changed; A support assembly, wherein the support assembly is provided with multiple groups, each group of the support assembly comprises a first support rod and a second support rod, the first support rod is hinged to the positioning ring, the second support rod is hinged to the mounting ring, the first support rod is hinged to the second support rod, and the first support rod and the second support rod have a first state of being in the same vertical line and a second state of having an angle; The sampling cylinder is arranged on the mounting ring, the sampling cylinder has an opening facing the positioning ring, and a blocking cover is arranged on the positioning ring. When the mounting ring and the positioning ring are close to each other, the blocking cover can block the opening of the sampling cylinder; A protection assembly, the protection assembly is used to prevent water from entering the interior of the sampling tube when the first support rod and the second support rod are in a first state; the protection assembly can also remove the obstruction of water from entering the interior of the sampling tube when the first support rod and the second support rod are in a second state; The adjusting component is used to adjust the distance between the mounting ring and the positioning ring after the positioning ring reaches the sampling water layer.

2. A groundwater sampling device according to claim 1, characterized in that: The protective assembly includes a protective cloth, which is fixedly connected to the first support rod and the second support rod of the multiple groups of support assemblies at the same time, and a plurality of liquid inlet holes are arranged on the protective cloth; when the first support rod and the second support rod are in a first state in the same vertical line, the protective cloth is in a stacked state, and the liquid inlet holes are blocked by the protective cloth itself.

3. A groundwater sampling device according to claim 1, characterized in that: The adjustment assembly comprises a first adjustment unit and a second adjustment unit. The first adjustment unit is used to adjust the positioning ring and the mounting ring to be closer to each other, and the second adjustment unit is used to adjust the positioning ring and the mounting ring to be farther away from each other.

4. A groundwater sampling device according to claim 3, characterized in that: The first adjustment unit includes a first positioning sleeve and a first adjustment rope. The first positioning sleeve is fixedly connected to the positioning ring. The first adjustment rope is slidably arranged inside the first positioning sleeve. The end of the first adjustment rope is connected to the mounting ring. The first adjustment rope can move relative to the first positioning sleeve.

5. A groundwater sampling device according to claim 4, characterized in that: The second adjustment unit includes a second positioning sleeve, a second adjustment rope and an adjustment sleeve. The adjustment sleeve is arranged above the positioning ring, and the inner diameter of the adjustment sleeve is equal to the outer diameter of the positioning ring; the second positioning sleeve is fixedly connected to the adjustment sleeve, and the second adjustment rope is slidably arranged inside the second positioning sleeve, and the end of the second adjustment rope is fixedly connected to the positioning ring, and the second adjustment rope can move relative to the second positioning sleeve.

6. A groundwater sampling device according to claim 5, characterized in that: The adjustment assembly also includes a traction member, which is used for traction of the first adjustment rope to move relative to the first positioning sleeve and traction of the second adjustment rope to move relative to the second positioning sleeve.

7. A groundwater sampling device according to claim 6, characterized in that: The traction member includes a positioning plate, a first reel and a second reel. The positioning plate can be placed on the ground. The first positioning sleeve and the second positioning sleeve can be fixed to the positioning plate. The first reel and the second reel are both fixedly connected to the positioning plate. The first reel can reel in or unreel the first adjustment rope. The second reel can reel in or unreel the second adjustment rope.

8. A groundwater sampling device according to claim 1, characterized in that: A connecting sleeve is arranged on the mounting ring, and the sampling tube can be slidably mounted in the connecting sleeve. When the sampling tube is mounted in the connecting sleeve, the opening faces the positioning ring.

9. A groundwater sampling device according to claim 8, characterized in that: A blocking ring is arranged at the opening of the sampling tube, and a buckle is arranged on the blocking cover. When the mounting ring and the positioning ring are close to each other, the buckle on the blocking cover fits with the blocking ring.

10. A groundwater sampling device according to claim 8, characterized in that: The outer side wall of the sampling tube is provided with a rubber ring.

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