An underground water sampling device

Abstract

The present invention relates to the technical field of sampling devices, and particularly relates to a groundwater sampling device, which includes a positioning ring, a mounting ring, a support assembly, a sampling cylinder, a protection assembly and an adjustment assembly. 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 approach each other, the first support rod and the second support rod of multiple adjustment assemblies simultaneously change from the first state to the second state. And, the protection assembly removes the obstruction to water entering the interior of the sampling cylinder. At the same time, the protection assembly can prevent debris in the groundwater from entering the sampling cylinder, ensuring that the water sample entering the interior of the sampling cylinder is representative. At the same time, after the sampling cylinder reaches the sampling water layer, water can pass through the protection assembly and enter the interior of the sampling cylinder, avoiding different layers of groundwater from entering the same sampling cylinder, thereby ensuring that the collected water sample has sufficient 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:

[0006] A groundwater sampling device comprises a positioning ring, a mounting ring, a supporting assembly, a sampling tube, a protective assembly and an adjusting assembly.

[0007] 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.

[0008] Further, the protection component includes a protection cloth, which is fixedly connected to the first support rod and the second support rod of multiple groups of support components at the same time. A plurality of liquid inlet holes are provided on the protection cloth; when the first support rod and the second support rod are in the first state on the same vertical line, the protection cloth is in a stacked state, and the liquid inlet holes are blocked by the protection cloth itself.

[0009] Further, the adjustment component 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 approach each other, and the second adjustment unit is used to adjust the positioning ring and the mounting ring to move away from each other.

[0010] Further, 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, and the first adjustment rope can move relative to the first positioning sleeve.

[0011] Further, 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.

[0012] Further, the adjustment component further includes a traction member, which is used to traction the first adjustment rope to move relative to the first positioning sleeve and traction the second adjustment rope to move relative to the second positioning sleeve.

[0013] Further, the traction member includes a positioning plate, a first winding device and a second winding device. 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 winding device and the second winding device are both fixedly connected to the positioning plate; the first winding device can wind or unwind the first adjustment rope; the second winding device can wind or unwind the second adjustment rope.

[0014] Further, a connecting sleeve is provided on the mounting ring, and the sampling cylinder can be slidably installed in the connecting sleeve. When the sampling cylinder is installed in the connecting sleeve, its opening faces the positioning ring.

[0015] Further, a blocking ring is provided at the opening of the sampling cylinder, and a buckle is provided on the blocking cover. When the mounting ring and the positioning ring approach each other, the buckle on the blocking cover fits with the blocking ring.

[0016] Further, a rubber ring is provided on the outer side wall of the sampling cylinder.

[0017] 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

[0018] 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.

[0019] Figure 1 A schematic diagram of the structure of a groundwater sampling device provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the cross-section structure of a groundwater sampling device provided by an embodiment of the present invention;

[0021] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0022] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0023] 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;

[0024] 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.

[0025] In the figure: 110, positioning ring; 120, mounting ring; 130, first support rod; 140, second support rod; 150, hinge groove; 210, sampling cylinder; 220, protective cloth; 240, first positioning sleeve; 250, first adjustment rope; 260, second positioning sleeve; 270, second adjustment rope; 280, adjustment sleeve; 310, connecting sleeve; 320, plugging ring; 330, buckle. Detailed implementation manner

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and 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.

[0028] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0029] As Figures 1 to 6 shown, a groundwater sampling device provided by an embodiment of the present invention includes a positioning ring 110, a mounting ring 120, a support assembly, a sampling cylinder 210, a protection assembly and an adjustment assembly.

[0030] 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 at an interval up and down. Among them, the positioning ring 110 is arranged above the installation ring 120, and the positioning ring 110 can sense the position of the water layer where 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, so as to obtain the position of the water layer where it is located. The distance between the installation ring 120 and the positioning ring 110 can be changed. In the initial state, the distance between the installation ring 120 and the positioning ring 110 is in the state of the largest distance.

[0031] There are multiple sets of support components, and the multiple sets of support components are evenly distributed in the circumferential direction around the positioning ring 110. Each set 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 installation ring 120. Specifically, a plurality of hinge grooves 150 are arranged on both the positioning ring 110 and the installation ring 120. 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 installation ring 120. The first support rod 130 is hinged to the second support rod 140. The first support rod 130 and the second support rod 140 have a first state in which they are on the same vertical line and a second state in which they have an included angle. In the initial state, the distance between the installation ring 120 and the positioning ring 110 is in the state of the largest distance, and the first support rod 130 and the second support rod 140 are in the first state in which they are on the same vertical line.

[0032] The sampling cylinder 210 is arranged on the installation ring 120, and the sampling cylinder 210 has an opening facing the positioning ring 110. A sealing cover is arranged on the positioning ring 110. When the installation ring 120 and the positioning ring 110 are close to each other, the sealing cover can block the opening of the sampling cylinder 210; in the initial state, the opening of the sampling cylinder 210 is in an open state.

[0033] The protection component is used to prevent water from entering the inside of the sampling cylinder 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 sundries in the groundwater from entering the sampling cylinder 210; the protection component can also lift the blockage of water entering the inside of the sampling cylinder 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 installation ring 120 gradually approaches. When the sealing cover on the positioning ring 110 blocks the opening of the sampling cylinder 210, the included angle between the first support rod 130 and the second support rod 140 reaches the limit angle. At this time, under the action of the sealing cover, it prevents water from continuing to enter the inside of the sampling cylinder 210, or prevents the water inside the sampling cylinder 210 from flowing outwards.

[0034] 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 into 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 to gradually decrease until the sealing cover on the positioning ring 110 seals the opening on the sampling cylinder 210. Subsequently, the adjustment component adjusts the distance between the positioning ring 110 and the mounting ring 120 to gradually return to the initial state.

[0035] For a groundwater sampling device of the present invention, when sampling groundwater, the first support rods 130 and the second support rods 140 of multiple support components are both in a first state on the same vertical line, and the protection component is in a state of preventing water from entering the interior of the sampling cylinder 210. When the positioning ring 110 reaches the sampling water layer, the adjustment component adjusts the distance between the mounting ring 120 and the positioning ring 110. When the mounting ring 120 and the positioning ring 110 approach, the first support rods 130 and the second support rods 140 of multiple adjustment components simultaneously change from the first state to the second state, and, the protection component releases the prevention of water from entering the interior of the sampling cylinder 210. At the same time, the protection component can prevent debris in the groundwater from entering the sampling cylinder 210, ensuring that the water sample entering the interior of the sampling cylinder 210 is representative. At the same time, after the sampling cylinder 210 reaches the sampling water layer, water can pass through the protection component and enter the interior of the sampling cylinder 210, avoiding different layers of groundwater from entering the same sampling cylinder 210, and thus ensuring that the collected water sample has sufficient representativeness.

[0036] In one embodiment, the protection component includes a protection cloth 220. The protection cloth 220 is fixedly connected to the first support rod 130 and the second support rod 140 of multiple groups of support components at the same time. The upper end of the protection cloth 220 is fixedly connected to the positioning ring 110, and the lower end of the protection cloth 220 is fixedly connected to the mounting ring 120. The protection cloth 220 is in a cylindrical shape. A plurality of liquid inlet holes are provided on the protection cloth 220. Specifically, the plurality of liquid inlet holes can be evenly divided into multiple groups. The multiple groups of liquid inlet holes are evenly distributed in the circumferential direction of the protection cloth 220. The number of groups of liquid inlet holes is the same as the number of groups of support components. Each group of liquid inlet holes is evenly distributed in the vertical direction of the protection cloth 220. When the first support rod 130 and the second support rod 140 are in the first state on the same vertical line, the protection cloth 220 is in a stacked state, and the liquid inlet holes are blocked by the protection cloth 220 itself. Further, when the first support rod 130 and the second support rod 140 are in the second state and the included angle between the first support rod 130 and the second support rod 140 reaches the limit state, the protection cloth 220 is lifted by the multiple first support rods 130 and the multiple second support rods 140. At this time, the protection cloth 220 is in a tensioned state. During the process of the protection cloth 220 being gradually tensioned, some of the liquid inlet holes on the protection cloth 220 are no longer blocked by itself, and water enters the interior of the sampling cylinder 210 through the liquid inlet holes. When the protection cloth 220 is completely tensioned, the opening of the sampling cylinder 210 is blocked by a blocking cover.

[0037] In one embodiment, the adjustment component 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 approach each other, and the second adjustment unit is used to adjust the positioning ring 110 and the mounting ring 120 to move away from each other. In the initial state, the positioning ring 110 and the mounting ring 120 are in the state of 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 approach each other. After the opening of the sampling cylinder 210 is blocked by the blocking cover, the second adjustment unit starts to adjust the positioning ring 110 and the mounting ring 120 to move away from each other.

[0038] 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 passing through the upper and lower end faces of the positioning ring 110. The first adjustment rope 250 is slidably disposed inside the first positioning sleeve 240. 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, by holding the first positioning sleeve 240 and then pulling the first adjustment rope 250 to move relative to the first positioning sleeve 240, the positioning ring 110 is kept in a relatively stationary state, and the mounting ring 120 gradually approaches the positioning ring 110.

[0039] Further, when the positioning ring 110 moves from the ground towards the sampling water layer, the staff gradually relaxes the first positioning sleeve 240. The staff judges whether the positioning ring 110 reaches the sampling water layer by the length of the relaxed first positioning sleeve 240.

[0040] In one embodiment, the second adjusting unit includes a second positioning sleeve 260, a second adjusting rope 270 and an adjusting sleeve 280. The adjusting sleeve 280 is coaxially arranged above the positioning ring 110. The inner diameter of the adjusting sleeve 280 is equal to the outer diameter of the positioning ring 110, and the adjusting sleeve 280 can be sleeved on the outside of the positioning ring 110. The second positioning sleeve 260 is fixedly connected to the adjusting sleeve 280. The second positioning sleeve 260 penetrates through the adjusting sleeve 280. The second adjusting rope 270 is slidably arranged inside the second positioning sleeve 260. The end of the second adjusting rope 270 is fixedly connected to the positioning ring 110, and the second adjusting rope 270 can move relative to the second positioning sleeve 260. In the initial state, there is a certain distance between the adjusting sleeve 280 and the positioning ring 110 in the vertical direction. After the opening of the sampling cylinder 210 is blocked by the blocking cover, by holding the second positioning sleeve 260 and then pulling the second adjusting rope 270 to move relative to the second positioning sleeve 260, the second adjusting rope 270 gradually pulls the positioning ring 110 to move into the adjusting sleeve 280. When the positioning ring 110 enters the adjusting sleeve 280, the lower end of the adjusting sleeve 280 squeezes the first support rods 130 of the plurality of support components, so that the first support rods 130 and the second support rods 140 gradually switch to the first state. Further, during the process of the first support rods 130 and the second support rods 140 switching to the first state, the first positioning sleeve 240 and the second positioning sleeve 260 are synchronously pulled up, so as to lift the positioning ring 110, the mounting ring 120 and the sampling cylinder 210 out of the water surface.

[0041] In one embodiment, the adjusting assembly further includes a traction member, and the traction member is further used to pull the first adjusting rope 250 to move relative to the first positioning sleeve 240 and pull the second adjusting rope 270 to move relative to the second positioning sleeve 260. Specifically, by providing the traction member, the working intensity of the staff is reduced, and at the same time, the control accuracy of the first adjusting rope 250 and the second adjusting rope 270 is improved.

[0042] In one embodiment, the towing 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 clamping member is provided on the positioning plate. When the staff relaxes the first positioning sleeve 240 and the second positioning sleeve 260, the clamping member 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 wind or unwind the first adjusting rope 250. The second reel can wind or unwind the second adjusting rope 270. When the first reel is started, the first positioning sleeve 240 is in a state fixed by the clamping member. When the second reel is started, the second positioning sleeve 260 is in a state fixed by the clamping member. Further, the clamping member, the first reel and the second reel can be independently controlled by the staff, improving the convenience of sampling.

[0043] In one embodiment, a connecting sleeve 310 is provided on the mounting ring 120. The sampling cylinder 210 can be slidably mounted in the connecting sleeve 310. When the sampling cylinder 210 is mounted in the connecting sleeve 310, its opening faces the positioning ring 110. In the initial state, the sampling cylinder 210 is mounted in the connecting sleeve 310. After the opening of the sampling cylinder 210 is blocked by the blocking cover, when the positioning ring 110 and the mounting ring 120 move away from each other, the sampling cylinder 210 disengages from the connecting sleeve 310.

[0044] In one embodiment, a blocking ring 320 is provided at the opening of the sampling cylinder 210, and a buckle 330 is provided on the blocking cover. When the mounting ring 120 and the positioning ring 110 approach each other, the buckle 330 on the blocking cover fits with the blocking ring 320. Specifically, by providing the buckle 330 and the blocking ring 320, the sealing performance of the blocking cover for blocking the opening of the sampling cylinder 210 is ensured.

[0045] In one embodiment, a rubber ring is provided on the outer side wall of the sampling cylinder 210. When the sampling cylinder 210 and the connecting sleeve 310 move relative to each other, there is friction between the rubber ring and the inner side wall of the connecting sleeve 310, preventing the sampling cylinder 210 from disengaging from the connecting sleeve 310 during the sinking of the positioning ring 110 to the sampling water layer.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall 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; An adjustment component, the adjustment component is used to adjust the distance between the mounting ring and the positioning ring after the positioning ring reaches the sampling water layer; The protection assembly includes a protection cloth, which is fixedly connected to the first support rod and the second support rod of the plurality of support assemblies at the same time, and a plurality of liquid inlet holes are arranged on the protection cloth; when the first support rod and the second support rod are in a first state in the same vertical line, the protection cloth is in a stacked state, and the liquid inlet holes are blocked by the protection cloth itself; 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; 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, and the first adjustment rope can move relative to the first positioning sleeve; 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.

2. A groundwater sampling device according to claim 1, 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.

3. A groundwater sampling device according to claim 2, 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.

4. 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.

5. A groundwater sampling device according to claim 4, 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.

6. A groundwater sampling device according to claim 4, characterized in that: The outer side wall of the sampling tube is provided with a rubber ring.

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