Groundwater stratified sampler

Abstract

The application discloses a layered groundwater sampler and belongs to the technical field of groundwater environment detection. The layered groundwater sampler mainly comprises a plurality of sampling units, a lifting rope and a well washing pump. The plurality of sampling units are distributed along the axial direction of a well pipe. The sampling unit comprises a counterweight plate, a sampling bottle, a pressing ring and a locking structure. The lifting rope is inserted into the counterweight plate along the axial direction of the counterweight plate. The counterweight plate is provided with a swing arm one and a swing arm two. The sampling unit has two sampling bottles. The first end of the swing arm one is hingedly connected with the counterweight plate. The second end of the swing arm one is connected with one of the sampling bottles. The first end of the swing arm two is hingedly connected with the counterweight plate. The second end of the swing arm two is connected with the other sampling bottle. The pressing ring is slidingly connected with the counterweight plate along the axial direction of the counterweight plate and is arranged between the swing arm one and the counterweight plate and between the swing arm two and the counterweight plate. Torsion springs are arranged between the swing arm one and the counterweight plate and between the swing arm two and the counterweight plate. The layered groundwater sampler can realize layered sampling and will not disturb the water body in the well pipe.

Description

Technical Field

[0001] This invention relates to the field of groundwater environmental monitoring technology, specifically to a groundwater stratified sampler. Background Technology

[0002] In the investigation of groundwater at contaminated sites, the uneven vertical distribution of groundwater pollution is caused by the density differences of different types of pollutants in the groundwater. Therefore, conducting stratified groundwater sampling is a key step to ensure the accuracy of site investigation data and the reliability of assessment results. It is of great necessity for the entire investigation, risk assessment and subsequent remediation of the contaminated site.

[0003] In existing technologies, using a Bayler tube or submersible pump requires multiple well runs to collect water samples from different formations. However, the movement of the Bayler tube or submersible pump can cause vertical hydraulic crosstalk within the well casing, affecting the accuracy of the sampling data.

[0004] Therefore, it is necessary to provide a new type of groundwater stratification sampler. Summary of the Invention

[0005] In view of the above-mentioned problems existing in the prior art, the purpose of this invention is to provide a groundwater stratified sampler that can achieve stratified sampling without disturbing the water body in the well pipe.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A groundwater stratification sampler is provided, comprising multiple sampling units, a lifting rope, and a well-washing pump. The multiple sampling units are spaced apart along the axial direction of the well pipe. Each sampling unit includes a counterweight plate, a sampling bottle, a pressure ring, and a locking structure. The lifting rope slides sequentially through the counterweight plate along its axial direction, and the counterweight plate of the lowest sampling unit slides downwards onto the lifting rope. The counterweight plate is provided with a first swing arm and a second swing arm. Each sampling unit has two sampling bottles. The first end of the first swing arm is hinged to the counterweight plate, and the first swing arm crosses through the second swing arm, with the second end of the first swing arm connected to one of the sampling bottles. The first end of the second arm is hinged to the counterweight plate. The second arm crosses through the first arm and the second end of the second arm is connected to another sampling bottle. The pressure ring is slidably connected to the counterweight plate along the axial direction of the counterweight plate. Torsion springs are provided between the first arm and the counterweight plate, and between the second arm and the counterweight plate. The well-washing pump can be inserted into the axis of the sampling unit. A locking structure is provided on the inner peripheral wall of the pressure ring. An extension plate is provided on the inner edge of the pressure ring extending towards the center. The locking structure includes a buckle installed on the inner peripheral wall of the extension plate. The buckle is a structure whose inner diameter can be elastically extended and retracted in the radial direction. When the well-washing pump is inserted into the axis of the sampling unit, the pressure ring is locked to the well-washing pump by the locking structure.

[0007] Furthermore, the sampling unit also includes a stopper. The sampling bottle has a structure with one end closed and the other end open. The stopper seals the opening of the sampling bottle. The stopper on the sampling bottle connected to the first swing arm slides in cooperation with the counterweight plate around the rotation center of the first end of the first swing arm. The stopper on the sampling bottle connected to the second swing arm slides in cooperation with the counterweight plate around the rotation center of the first end of the second swing arm.

[0008] Furthermore, the sampling unit also includes a slide block fixedly connected to the counterweight plate. The slide block has a ring-shaped structure and is coaxially disposed below the counterweight plate. The pressure ring is sleeved on the outside of the slide block. The slide block is provided with a sliding groove. The plug body is provided with a sliding shaft slidably installed in the sliding groove. The sliding groove on the plug body of the sampling bottle connected to the first swing arm is an arc-shaped groove with the rotation center of the first end of the first swing arm as the center. The sliding groove on the plug body of the sampling bottle connected to the second swing arm is an arc-shaped groove with the rotation center of the first end of the second swing arm as the center.

[0009] Furthermore, the sampling bottle is hinged to the second end of the first swing arm / second swing arm near the closed end, and the bottom wall of the slide groove near the counterweight plate is provided with a locking hole that communicates with the slide groove. When the slide shaft slides into the locking hole, the slide shaft can engage with the locking hole.

[0010] Furthermore, the slide block is provided with two symmetrical sliding grooves on both sides of the plug body. The slide shaft includes a shaft block one, a shaft block two, and an elastic element. Shaft block one and shaft block two are symmetrically and slidably arranged on both sides of the plug body. The elastic element is arranged between shaft block one and shaft block two. The elastic element applies elastic force to drive shaft block one and shaft block two to move in opposite directions, so that shaft block one and shaft block two are slidably installed in the two sliding grooves on the slide block. When the slide shaft slides into the engagement hole, the elastic force of the elastic element drives shaft block one and shaft block two to be inserted into the engagement holes of the two sliding grooves respectively.

[0011] Furthermore, the pressure ring is located below the counterweight plate and above the sampling bottle. A top pressure airbag is provided at the bottom of the counterweight plate and at the end of the pressure ring near the counterweight plate. An air inlet pipe connected to the top pressure airbag is also installed on the counterweight plate. By moving the pressure ring away from the counterweight plate and downward, the pressure ring is pressed down and a downward pressure is applied to the open end of the sampling bottle.

[0012] Furthermore, the sampling unit also includes a tailstock, which is installed on the closed end of the sampling bottle. The tailstock is provided with an end shaft, and the end shaft is hinged to the second end of the first swing arm / second swing arm. At the same time, the tailstock protrudes axially from the second end of the first swing arm / second swing arm.

[0013] Furthermore, the tailstock includes a sleeve and a tail cap. The sleeve is fitted onto the closed end of the sampling bottle, and the tail cap is detachably connected to the sleeve and located at the bottom of the sampling bottle. The end shaft is disposed on the outer peripheral wall of the sleeve.

[0014] Furthermore, the tail cover includes a base, a sliding end, and a connecting post. The tail cover has a sliding layer in its cross-sectional direction, which allows the tail cover to be separated from the sliding layer to form a base and a sliding end that can be assembled into a whole. The base is close to the sleeve. A stop protrusion is provided at one end of the sliding layer near the base, and a locking protrusion is provided at one end of the base near the sliding layer. The locking protrusion is located above the stop protrusion, that is, on the side of the stop protrusion close to the counterweight plate. The connecting post is made of elastic material and is connected between the base and the sliding end along the axial direction of the tail cover.

[0015] Furthermore, a limiting spring is connected to the first swing arm / second swing arm connected to the sampling bottle, and the limiting spring is located on the side of the sampling bottle away from the counterweight plate.

[0016] The beneficial effects of this invention are as follows: The groundwater stratified sampler provided by this invention includes multiple sampling units, a lifting rope, and a well-washing pump. The multiple sampling units are spaced apart along the axial direction of the well pipe. Each sampling unit includes a counterweight plate, a sampling bottle, a pressure ring, and a locking structure. The lifting rope slides sequentially through the counterweight plate along its axial direction, and the counterweight plate of the lowest sampling unit slides downwards onto the lifting rope. The counterweight plate is equipped with a first swing arm and a second swing arm. Each sampling unit has two sampling bottles. The first end of the first swing arm is hinged to the counterweight plate. The first swing arm crosses through the second swing arm, and the second end of the first swing arm is connected to one of the sampling bottles. The first end of the second swing arm is hinged to the counterweight plate. The two swing arms cross each other through the first swing arm, and the second end of the second swing arm is connected to another sampling bottle. The pressure ring slides along the axial direction of the counterweight plate and is connected to the counterweight plate. Torsion springs are provided between the first swing arm and the counterweight plate, and between the second swing arm and the counterweight plate. The second end of the first swing arm swings closer to the counterweight plate, and the second end of the second swing arm swings closer to the counterweight plate. Under the action of gravity, the pressure ring slides away from the counterweight plate and pushes the second end of the first swing arm and the second end of the second swing arm downward away from the counterweight plate. In this way, the second end of the first swing arm and the second end of the second swing arm will gradually approach each other, thereby moving away from the inner circumference of the well pipe, so that the sampling unit can move freely and unrestrained in the well pipe.When the sampling unit sinks into the water, the buoyancy of the sampling bottle causes the torsion spring to exert a spring force on the swing arms, causing the second ends of the swing arms to swing upwards towards the counterweight plate. This resists the downward pressure of the pressure ring, causing it to passively slide upwards towards the counterweight plate. Ultimately, the second ends of the swing arms move in opposite directions, opening outwards, so that the second ends of the swing arms simultaneously abut against opposite sides of the inner circumferential wall of the well casing. The counterweight... Due to gravity, the second end of swing arm one / the second end of swing arm two has contact friction with the inner circumferential wall of the well casing. This causes an upward reaction thrust on the second end of swing arm one / the second end of swing arm two, further driving the second ends of swing arm one and swing arm two to swing upward towards the counterweight plate. This causes swing arms one and two to abut against the inner circumferential wall of the well casing, thus fixing the sampling unit's position relative to the well casing and maintaining the sampling unit at a specified depth within the well casing. The well pump can be inserted into the shaft of the sampling unit. A locking structure is provided on the inner circumferential wall of the pressure ring. When the well-washing pump is inserted into the shaft of the sampling unit, the pressure ring is locked onto the well-washing pump through the locking structure. This prevents the sampling unit from immediately fixing its depth when it is submerged in water, allowing for arbitrary adjustment of the sampling unit's depth within the well casing. After the well-washing pump washes the well casing and the casing is left to stand for a period, stratified sampling can be achieved using sampling bottles from multiple sampling units. Thus, through the above technical solution, the groundwater stratified sampler provided in this embodiment of the invention can lock multiple sampling units onto the well casing at the required depth. After the well-washing pump washes the well, sampling is performed at each stratum using sampling bottles. By using the well-washing pump to lock multiple sampling units onto the well casing at the required depth, sampling can be achieved without moving the groundwater stratified sampler provided by this invention within the well casing after the well-washing pump, without disturbing the water body in the well casing. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional structural diagram of a groundwater stratified sampler provided in an embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional schematic diagram of the groundwater stratification sampler provided in the embodiments of the present invention in its first working state.

[0020] Figure 3 This is a three-dimensional structural diagram of the sampling unit provided in an embodiment of the present invention.

[0021] Figure 4 for Figure 3 The diagram shows an exploded view of the sampling unit.

[0022] Figure 5 for Figure 2 An enlarged schematic diagram of region A in the middle.

[0023] Figure 6 for Figure 5 Enlarged schematic diagram of region B in the middle.

[0024] Figure 7 This is a cross-sectional schematic diagram of the slide provided in an embodiment of the present invention.

[0025] Figure 8 This is a perspective view of the slide provided in an embodiment of the present invention.

[0026] Figure 9 This is a three-dimensional structural diagram of the plug provided in an embodiment of the present invention.

[0027] Figure 10 for Figure 9 The front view of the plug shown.

[0028] Figure 11 For along Figure 10 Cross-sectional view along the EE direction.

[0029] Figure 12 for Figure 5 The diagram shows the structure of the groundwater stratification sampler in its second working state.

[0030] Figure 13 for Figure 5 The diagram shows the structure of the groundwater stratification sampler in its third operating state.

[0031] Figure 14 A cross-sectional view of the tailstock provided in an embodiment of the present invention.

[0032] In the figure, the following labels are used: 10, sampling unit; 1, counterweight plate; 11, swing arm one; 12, swing arm two; 13, window; 14, limiting spring; 2, sampling bottle; 21, sample chamber; 22, opening; 3, tailstock; 31, sleeve; 32, tail cap; 321, base; 322, sliding end; 323, sliding layer; 324, stop protrusion; 325, locking protrusion; 326, connecting column; 33, end shaft; 4, plug body; 41, base; 42, plug; 43, sliding shaft; 4 31. Shaft block one; 432. Shaft block two; 433. Elastic element; 44. Lever; 5. Pressure ring; 51. Lower abutment edge; 52. Cavity; 53. Extension plate; 531. Baffle; 6. Slide seat; 61. Slide groove; 62. Engaging hole; 63. Relief groove; 7. Top pressure airbag; 8. Locking structure; 81. Press buckle; 811. Arched convex wall; 812. Fixed end; 9. Air inlet pipe; 20. Lifting rope; 30. Inlet gap; 40. Spacer block; 100. Well washing pump; 200. Well casing. Detailed Implementation

[0033] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0034] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0037] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0038] Please refer to Figures 1 to 14As shown, the groundwater stratified sampler provided by the present invention will now be described. This groundwater stratified sampler includes multiple sampling units 10, lifting ropes 20, and a well-washing pump 100. The multiple sampling units 10 are spaced apart along the axial direction of the well pipe 200. Each sampling unit 10 includes a counterweight plate 1, sampling bottles 2, a pressure ring 5, and a locking structure 8. The lifting ropes 20 are sequentially slidably inserted into the counterweight plate 1 along its axial direction. The counterweight plate 1 of the lowest sampling unit 10 slides downwards onto the lifting rope 20. The counterweight plate 1 is provided with a first swing arm 11 and a second swing arm 12. Each sampling unit 10 has two sampling bottles 2. The first swing arm 11... The first end of the swing arm 11 is hinged to the counterweight plate 1. The first swing arm 11 crosses through the second swing arm 12, and the second end of the first swing arm 11 is connected to one of the sampling bottles 2. The first end of the second swing arm 12 is hinged to the counterweight plate 1. The second swing arm 12 crosses through the first swing arm 11, and the second end of the second swing arm 12 is connected to the other sampling bottle 2. The pressure ring 5 is slidably connected to the counterweight plate 1 along the axial direction of the counterweight plate 1. Torsion springs are provided between the first swing arm 11 and the counterweight plate 1, and between the second swing arm 12 and the counterweight plate 1, to drive the second end of the first swing arm 11 to swing closer to the counterweight plate 1, and to drive the second end of the second swing arm 12 to swing closer to the counterweight plate 1. Figure 5 As shown, under the action of gravity, the pressure ring 5 slides away from the counterweight plate 1 and pushes against the second end of the first swing arm 11 and the second end of the second swing arm 12, swinging downwards away from the counterweight plate 1. In this way, the second ends of the first swing arm 11 and the second end of the second swing arm 12 will gradually move closer to each other, thus moving away from the inner circumferential wall of the well casing 200, allowing the sampling unit 10 to move freely and unrestricted within the well casing 200; Figure 12As shown, when the sampling unit 10 is submerged in water, the buoyancy of the sampling bottle 2 causes the torsion spring to exert a spring force on the swing arms 11 and 12, driving the second ends of the swing arms 11 and 12 to swing upwards towards the counterweight plate 1. This resists the downward pressure of the pressure ring 5, causing the pressure ring 5 to passively slide upwards towards the counterweight plate 1. Ultimately, the second ends of the swing arms 11 and 12 move in opposite directions to spread outwards, causing them to simultaneously abut against opposite sides of the inner circumferential wall of the well pipe 200. The counterweight plate 1 is then... Under the influence of gravity, there is contact friction between the second end of swing arm 11 / swing arm 12 and the inner circumferential wall of the well casing 200. This causes the second ends of swing arms 11 / 12 to experience an upward reaction thrust towards the counterweight plate 1, further driving the second ends of swing arms 11 and 12 to swing upward towards the counterweight plate 1. This causes swing arms 11 and 12 to abut against the inner circumferential wall of the well casing 200, thus fixing the sampling unit 10 in position relative to the well casing 200 and maintaining it at a specified depth within the well casing 200 for well cleaning. Pump 100 can be inserted into the shaft of sampling unit 10. A locking structure 8 is provided on the inner circumferential wall of pressure ring 5. When pump 100 is inserted into the shaft of sampling unit 10, pressure ring 5 is locked onto pump 100 by locking structure 8. This prevents the sampling unit 10 from immediately fixing its depth when it is submerged in water, allowing for easy adjustment of the sampling unit 10's depth within well casing 200. Well washing is performed by pump 100 within well casing 200. After washing, the well is left to stand for a period of time, and the results can be obtained through multiple... The sampling bottle 2 of each sampling unit 10 enables stratified sampling. Thus, through the above technical solution, the groundwater stratified sampler provided in this embodiment of the invention can be locked onto the well pipe 200 at the required depth by multiple sampling units 10. After the well is cleaned by the well-washing pump 100, sampling is carried out in each layer by sampling bottle 2. The well-washing pump 100 locks multiple sampling units 10 onto the well pipe 200 at the required depth. In this way, after the well is cleaned by the well-washing pump 100, sampling can be achieved without moving the groundwater stratified sampler provided in this invention in the well pipe 200, without disturbing the water body in the well pipe 200.

[0039] like Figure 2As shown, in some embodiments, a window 13 is provided at the axis of the counterweight plate 1 to allow the well-washing pump 100 to pass through. The pressure ring 5 has an annular structure to avoid the well-washing pump 100 passing through the window 13. The first swing arm 11 and the second swing arm 12 are located on the counterweight plate 1 away from the axis of the counterweight plate 1. Specifically, in this embodiment, two swing arms 11 are symmetrically arranged on the counterweight plate 1 along the axis of the counterweight plate 1, and two swing arms 12 are symmetrically arranged on the counterweight plate 1 along the axis of the counterweight plate 1. The pressure ring 5 and the sampling bottle 2 are located between the two swing arms 11 and 12. In this way, the swingable swing arms 11 and 12 can avoid the axis of the counterweight plate 1 and will not interfere with the well-washing pump 100. Moreover, the two symmetrically arranged swing arms 11 and 12 can make the connected sampling bottle 2 subject to force balance and more reliable connection.

[0040] like Figure 1 As shown, in some embodiments, the upper end of the counterweight plate 1 of the sampling unit 10 located in the lower layer is provided with a spacer block 40 so that when multiple sampling units 10 are stacked together, the upper and lower adjacent counterweight plates 1 are blocked by the spacer block 40, so as to avoid collision between adjacent sampling units 10 when they are close to each other and affect the normal operation of other components.

[0041] like Figure 4 , Figure 5 As shown, in some embodiments, the sampling unit 10 further includes a stopper 4. The sampling bottle 2 has a structure with one end closed and the other end open 22. The stopper 4 is sealed on the opening 22 of the sampling bottle 2. The stopper 4 on the sampling bottle 2 connected to the first swing arm 11 slides around the rotation center of the first end of the first swing arm 11 and slides around the rotation center of the first end of the second swing arm 12 and slides around the rotation center of the first end of the second swing arm 12. In this way, when the first swing arm 11 / second swing arm 12 swings around the first end on the counterweight plate 1, the stopper 4 sealed on the opening 22 of the sampling bottle 2 can swing along the same rotation center with the first swing arm 11 / second swing arm 12 to maintain the sealing effect of the stopper 4 on the opening 22 of the sampling bottle 2.

[0042] like Figure 5 , Figure 7 and Figure 8As shown, in some embodiments, the sampling unit 10 further includes a slide 6 fixedly connected to the counterweight plate 1. The slide 6 has an annular structure and is coaxially disposed below the counterweight plate 1. The pressure ring 5 is sleeved on the outside of the slide 6. The slide 6 is provided with a groove 61, and the plug body 4 is provided with a sliding shaft 43 slidably installed in the groove 61. The groove 61 on the sampling bottle 2 connected to the first swing arm 11 is an arc-shaped groove with the rotation center of the first end of the first swing arm 11 as the center. The groove 61 on the sampling bottle 2 connected to the second swing arm 12 is an arc-shaped groove with the plug body 4 fitted in place. The sliding groove 61 is an arc-shaped groove with the rotation center of the first end of the swing arm 12 as the center, so that the stopper 4 of the sampling bottle 2 connected to the swing arm 11 slides around the rotation center of the first end of the swing arm 11 and slides around the rotation center of the first end of the swing arm 12 and slides around the rotation center of the first end of the swing arm 12. Specifically, the slide seat 6 is provided with a relief groove 63 suitable for accommodating the stopper 4 above the stopper 4, and the sliding groove 61 is located on the side wall of the relief groove 63 facing the swing arm 11 / swing arm 12.

[0043] like Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments, to achieve the sampling operation of the sampling bottle 2, the position near the closed end of the sampling bottle 2 is hinged to the second end of the first swing arm 11 / second swing arm 12, so that the sampling bottle 2 can swing around the second end of the first swing arm 11 / second swing arm 12, so that the opening 22 of the sampling bottle 2 disengages from the stopper 4. Specifically, the bottom wall of the slide groove 61 near the counterweight plate 1 is provided with a locking hole 62 that communicates with the slide groove 61. When the slide shaft 43 slides into the locking hole 62, the slide shaft 43 can engage with the locking hole 62, so that the slide shaft 43 is locked in the locking hole 62. Figure 8 As shown, because the depth of the engaging hole 62 is greater than the depth of the sliding groove 61, when the sliding shaft 43 is inserted into the engaging hole 62, the peripheral sidewall of the sliding shaft 43 will be blocked by the engaging hole 62 and cannot be transferred to the sliding groove 61, as... Figure 12 and Figure 13As shown, when the sampling unit 10 is submerged in water, the second ends of the first swing arm 11 and the second ends of the second swing arm 12 swing upwards towards the counterweight plate 1, causing the second ends of the first swing arm 11 and the second ends of the second swing arm 12 to simultaneously abut against the opposite sides of the inner circumferential wall of the well pipe 200, fixing the sampling unit 10 in position relative to the well pipe 200. The plug 4 slides along the groove 61 towards the counterweight plate 1, causing the sliding shaft 43 to slide into the engaging hole 62. At this time, an external force is applied to drive the sampling bottle 2 to swing around the second ends of the first swing arm 11 / second swing arm 12, causing the sampling unit 10 to be positioned relative to the well pipe 200. As the sample bottle 2 swings away from the counterweight plate 1 at the end near the opening 22, the stopper 4 cannot slide along the path of the slide groove 61. The sampling bottle 2, which swings around the second end of the first swing arm 11 / the second end of the second swing arm 12, will drag the stopper 4 through the slide shaft 43 to rotate around the locking hole 62, causing the stopper 4 to partially disengage from the opening 22 of the sampling bottle 2. An inlet gap 30 is formed between the end of the sampling bottle 2 with the opening 22 and the stopper 4, so that the sample can enter the sample chamber 21 inside the sampling bottle 2 through the inlet gap 30 and the opening 22 of the sampling bottle 2.

[0044] like Figure 10 , Figure 11 As shown, in some embodiments, the slide block 6 is symmetrically provided with two sliding grooves 61 on both sides of the plug body 4. The slide shaft 43 includes a first shaft block 431, a second shaft block 432, and an elastic element 433. The first shaft block 431 and the second shaft block 432 are symmetrically and slidably arranged on both sides of the plug body 4. The elastic element 433 is disposed between the first shaft block 431 and the second shaft block 432. The elastic element 433 applies a spring force to drive the first shaft block 431 and the second shaft block 432 to move in opposite directions, so that the first shaft block 431 and the second shaft block 432 are slidably installed in the two sliding grooves 61 on the slide block 6. When the slide shaft 43 slides into the engaging hole 62, the first shaft block 431 is driven by the spring force of the elastic element 433. The first shaft block 431 and the second shaft block 432 are respectively inserted into the engagement holes 62 of the two slide grooves 61, so that the first shaft block 431 and the second shaft block 432 are pushed into the engagement holes 62 by the elastic member 433 and are not easy to fall out. Specifically, in this embodiment, a lever 44 is provided on both the first shaft block 431 and the second shaft block 432. The lever 44 is perpendicular to the first shaft block 431 and the second shaft block 432, and the lever 44 extends to the outside of the plug body 4, so that the lever 44 can be easily contacted from the outside of the plug body 4, so that the first shaft block 431 and the second shaft block 432 can be moved relative to each other by moving the lever 44, thereby causing the first shaft block 431 and the second shaft block 432 to fall out of the engagement holes 62, so that the slide shaft 43 can be reset back into the slide groove 61.

[0045] like Figure 5As shown, in some embodiments, the stopper 4 includes a base 41 and a flexible stopper 42 connected to the base 41. The stopper 42 seals the opening 22 of the sampling bottle 2. Specifically, the end of the stopper 42 near the sampling bottle 2 has an arched structure and is inserted into the opening 22 of the sampling bottle 2. In this way, the stopper 42 is not easy to slide relative to the sampling bottle 2 in the radial direction. That is, the resistance to the movement of the stopper 42 in the radial direction of the sampling bottle 2 is large. Thus, when the sampling bottle 2 swings around the end shaft 33, the stopper 42 is suitable to swing around the sliding shaft 43. Or when the sampling bottle 2 swings with the swing arm 11 / swing arm 212 around the rotation center of the first end of the swing arm 11 / swing arm 212, the stopper 42 is suitable to slide along the sliding groove 61, thereby preventing the stopper 42 from accidentally coming off the opening 22 of the sampling bottle 2.

[0046] like Figure 3 , Figure 5 As shown, in some embodiments, the pressure ring 5 is located below the counterweight plate 1 and above the sampling bottle 2. A pressure bladder 7 is provided at the bottom of the counterweight plate 1 and at the end of the pressure ring 5 near the counterweight plate 1. An air inlet pipe 9 connected to the pressure bladder 7 is also installed on the counterweight plate 1. By moving the pressure ring 5 away from the counterweight plate 1 and downwards, the pressure ring 5 can be pressed down and apply downward pressure to the opening 22 end of the sampling bottle 2, thereby applying external force to drive the sampling bottle 2 to swing around the second end of the swing arm 11 / swing arm 12, causing the end of the sampling bottle 2 near the opening 22 to swing away from the counterweight plate 1. Figure 13 As shown, when the sampling unit 10 is submerged in water, the second ends of the first swing arm 11 and the second ends of the second swing arm 12 swing upwards towards the counterweight plate 1, causing the second ends of the first swing arm 11 and the second ends of the second swing arm 12 to simultaneously abut against the opposite sides of the inner circumferential wall of the well pipe 200, fixing the position of the sampling unit 10 relative to the well pipe 200. The plug 4 slides along the slide groove 61 towards the counterweight plate 1, causing the slide shaft 43 to slide into the engagement hole 62. At this time, the pressure ring 5 is pushed by the sampling bottle 2 against the counterweight plate 1. On the top pressure airbag 7 of the weight plate 1, by controlling the expansion of the top pressure airbag 7 to push the compression ring 5 away from the counterweight plate 1, the compression ring 5 can be pressed down to drive the sampling bottle 2 to swing around the second end of the swing arm 11 / swing arm 22, so that the end of the sampling bottle 2 near the opening 22 swings away from the counterweight plate 1, thereby causing the stopper 4 of the sampling bottle 2 to disengage from the opening 22 of the sampling bottle 2, and allowing the sample to enter the sample chamber 21 of the sampling bottle 2 through the inlet gap 30 and the opening 22 of the sampling bottle 2.

[0047] like Figure 3 , Figure 4 and Figure 5As shown, in some embodiments, the sampling unit 10 further includes a tailstock 3, which is installed on the closed end of the sampling bottle 2. The tailstock 3 is provided with an end shaft 33, and the end shaft 33 is hinged to the second end of the swing arm 11 / swing arm 2 12, so that the closed end of the sampling bottle 2 is hinged to the second end of the swing arm 11 / swing arm 2 12. At the same time, the tailstock 3 protrudes from the second end of the swing arm 11 / swing arm 2 12 in the axial direction, so that when the second end of the swing arm 11 and the second end of the swing arm 2 12 swing upwards towards the counterweight plate 1, the tailstock 3 at the second end of the swing arm 11 and the tailstock 3 at the second end of the swing arm 2 12 simultaneously abut against the opposite sides of the inner peripheral wall of the well pipe 200.

[0048] like Figure 4 , Figure 5 As shown, in some embodiments, the tailstock 3 includes a sleeve 31 and a tail cap 32. The sleeve 31 is fitted onto the closed end of the sampling bottle 2, and the tail cap 32 is detachably connected to the sleeve 31 and located at the bottom of the sampling bottle 2. The end shaft 33 is disposed on the outer peripheral wall of the sleeve 31. In this way, when the tail cap 32 is connected to the sleeve 31, the sampling bottle 2 is blocked against the sleeve 31, so that the sampling bottle 2 cannot slide axially relative to the sleeve 31. When it is necessary to remove the sampling bottle 2, the tail cap 32 is removed from the sleeve 31, so that the bottom end of the sampling bottle 2 can be exposed, and the sampling bottle 2 can be pulled out axially from the sleeve 31.

[0049] like Figure 14As shown, in some embodiments, the tail cap 32 includes a base 321, a sliding end 322, and a connecting post 326. The tail cap 32 has a sliding layer 323 in its cross-sectional direction, allowing the tail cap 32 to be separated from the sliding layer 323 to form a base 321 and a sliding end 322 that can be assembled into a whole. The base 321 is close to the sleeve 31. A stop protrusion 324 protrudes from one end of the sliding layer 323 near the base 321, and a locking protrusion 324 protrudes from one end of the base 321 near the sliding layer 323. 5. The locking protrusion 325 is located above the blocking protrusion 324, that is, the locking protrusion 325 is located on the side of the blocking protrusion 324 closer to the counterweight plate 1. The connecting column 326 is made of elastic material. The connecting column 326 is connected between the base 321 and the sliding end 322 along the axial direction of the tail cover 32. In this way, under the elastic restoring force of the connecting column 326, the sliding end 322 can be pulled to abut against the base 321, so that the blocking protrusion 324 and the locking protrusion 325 are in contact. The tail cover 32 follows the second end of the swing arm 11. When the second end of the swing arm 12 swings upward toward the counterweight plate 1 and contacts the inner circumferential wall of the well pipe 200, the sliding end 322 of the tail cap 32 rubs against the inner circumferential wall of the well pipe 200 and receives a frictional force in the direction of upward toward the counterweight plate 1. Since the locking protrusion 325 on the base 321 is located above the blocking protrusion 324 of the sliding end 322, that is, the locking protrusion 325 is located on the side of the blocking protrusion 324 closer to the counterweight plate 1, the locking protrusion 325 and the blocking protrusion 324 abut against each other to maintain the base 3 When the counterweight plate 1 is pulled upward by the lifting rope 20, the sliding end 322 of the tail cover 32 rubs against the inner peripheral wall of the well pipe 200 and is subjected to a downward frictional force away from the counterweight plate 1. This will cause the stop protrusion 324 to disengage from the locking protrusion 325, and the sliding end 322 will slide downward away from the counterweight plate 1, so that the tail cover 32 of the tail seat 3 tends to move away from the inner peripheral wall of the well pipe 200, thereby adapting to the upward movement of the sampling unit 10 and its removal from the well pipe 200.

[0050] like Figure 3 As shown, in some embodiments, a limiting spring 14 is connected to the swing arm 11 / swing arm 2 12 connected to the sampling bottle 2. The limiting spring 14 is located on the side of the sampling bottle 2 away from the counterweight plate 1. In this way, when the pressure ring 5 slides close to the sampling bottle 2 and pushes the sampling bottle 2 to swing away from the counterweight plate 1 around the end shaft 33 connected to the second end of the swing arm 11 / swing arm 2 12, the limiting spring 14 can apply an elastic restoring force to drive the sampling bottle 2 to swing close to the counterweight plate 1 around the end shaft 33 connected to the second end of the swing arm 11 / swing arm 2 12. Thus, the sampling bottle 2 can swing back to the state where the opening 22 is closed by the plug 4 under the action of the limiting spring 14.

[0051] like Figure 5 , Figure 6As shown, in some embodiments, an extension plate 53 extends from the inner edge of the pressure ring 5 towards the center. The locking structure 8 includes a buckle 81 installed on the inner peripheral wall of the extension plate 53. The buckle 81 has a structure whose inner diameter can be elastically stretched in the radial direction. This causes frictional resistance to be generated between the buckle 81 and the outer peripheral wall of the well-washing pump 100 when the buckle 81 is fitted onto the outer peripheral wall of the well-washing pump 100. Thus, when the sampling unit 10 is submerged in water, the well-washing pump 100 passes through the sampling unit. At the axis of 10, the buckle 81 is locked to the well washing pump 100, so that the pressure ring 5 of the sampling unit 10 will not move close to the counterweight plate 1 immediately, but will be kept away from the counterweight plate 1. In this way, the second end of the swing arm 11 and the second end of the swing arm 12 cannot swing close to the counterweight plate 1 under the action of the torsion spring. That is, when the sampling unit 10 is submerged in water, the locking structure 8 and the well washing pump 100 lock together to prevent the sampling unit 10 from being immediately in the locked depth state.

[0052] like Figure 6 As shown, in some embodiments, the snap fastener 81 is an annular structure with an arc-shaped cross-section. One end of the snap fastener 81 is provided with a fixed end 812, which is fixedly connected to the extension plate 53. The other end of the snap fastener 81 slides against the corresponding smooth baffle 531 provided on the extension plate 53. The inner peripheral wall of the snap fastener 81 arches towards the center to form an arched wall 811. When the arched wall 811 is squeezed by the well cleaning pump 100, the snap fastener 81 drives the other end of the snap fastener 81 to slide on the baffle 531 through elastic deformation, so that the arched wall 811 and the outer peripheral wall of the well cleaning pump 100 are squeezed and rubbed, forcing the snap ring 5 to be temporarily locked on the well cleaning pump 100.

[0053] like Figure 2 As shown, in some embodiments, a cavity 52 that is closed to the outside is provided around the circumference of the pressure ring 5. On the one hand, it can reduce the weight of the pressure ring 5, and on the other hand, it can increase the drainage volume of the pressure ring 5. Thus, when the pressure ring 5 is in water, it can float up and approach the counterweight plate 1 under the action of buoyancy. When it is necessary for the second end of the first swing arm 11 and the second end of the second swing arm 12 to swing upward and approach the counterweight plate 1, the pressure ring 5 can adaptively float up and approach the counterweight plate 1.

[0054] like Figure 5 As shown, in some embodiments, the pressure ring 5 has a smooth lower abutment 51 at one end near the sampling bottle 2, so that the pressure ring 5 can reduce wear when it contacts the sampling bottle 2 through the lower abutment 51.

[0055] When using the groundwater stratified sampler provided in this embodiment of the invention, such as... Figure 5As shown, the well-washing pump 100 is first inserted into the axis of multiple sampling units 10 simultaneously, that is, the well-washing pump 100 passes through the window 13 of the counterweight plate 1 of the sampling unit 10, so that the buckle 81 connected to the pressure ring 5 locks with the well-washing pump 100. The traction rope 20 and the well-washing pump 100 are simultaneously lowered into the well casing 200. When the uppermost sampling unit 10 reaches the designated depth, as... Figure 12 As shown, pulling the air inlet pipe 9 of the uppermost sampling unit 10 separates the uppermost sampling unit 10 from the well-washing pump 100. At this time, because the buckle 81 disengages from the well-washing pump 100, the unconstrained pressure ring 5 can move upwards close to the counterweight plate 1. Simultaneously, under the action of the torsion spring, the second ends of the first swing arm 11 and the second swing arm 12 swing upwards close to the counterweight plate 1, causing the tail seat 3 of the closed end of the sampling bottle 2 to abut against the peripheral wall of the well pipe 200. At the same time, the counterweight plate 1 will press down under the gravity, locking the uppermost sampling unit 10 in the well pipe 200 and preventing it from moving downwards. Similarly, the lower sampling units 10 are positioned sequentially from top to bottom to the designated depth. Then, the well-washing operation is carried out by the sinking well-washing pump 100. After waiting for a period of time, water is allowed to re-infiltrate into the well pipe 200. Then, the sampling bottles 2 of multiple sampling units 10 are controlled to take samples through the air inlet pipe 9. After sampling is completed, the lifting rope 20 can be pulled to move the sampling unit 10. Multiple sampling units 10 move one by one from bottom to top away from the well pipe 200 until multiple sampling units 10 overlap and move upward to detach from the well pipe 200. After removing multiple sampling units 10, the sample in the sample chamber 21 can be easily recovered and the sample bottle 2 can be cleaned by removing the tail cap 32 from the sleeve 31 and pulling the sample bottle 2 out of the sleeve 31. Alternatively, a container can be placed directly at the axis of the sampling unit 10, and the sample bottle 2 can be swung around the end shaft 33 until the opening 22 is opened, and the sample in the sample chamber 21 can be poured out into the container. After use, the sliding shaft 43 is removed from the locking hole 62 and reset into the sliding groove 61 by using the lever 44. At the same time, the pressure ring 5 slides down away from the counterweight plate 1 under the action of gravity to push the first swing arm 11 and the second swing arm 12 to swing away from the counterweight plate 1 until the sliding shaft 43 slides down into place along the sliding groove 61.

[0056] 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, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A groundwater stratification sampler, characterized in that: The system includes multiple sampling units, lifting ropes, and a well-washing pump. The sampling units are spaced apart along the axial direction of the well casing. Each sampling unit includes a counterweight plate, sampling bottles, a pressure ring, and a locking structure. The lifting ropes slide sequentially through the counterweight plates along their axial direction, with the counterweight plate of the lowest sampling unit sliding downwards onto the lifting rope. The counterweight plate has two swing arms. Each sampling unit has two sampling bottles. The first end of swing arm one is hinged to the counterweight plate, and swing arm one crosses through swing arm two, with the second end of swing arm one connected to one of the sampling bottles. The first end of swing arm two is hinged to the counterweight plate, and swing arm two crosses through swing arm one, with the second end of swing arm two connected to... Connecting to another sampling bottle, the pressure ring is slidably connected to the counterweight plate along the axial direction of the counterweight plate. Torsion springs are provided between the first swing arm and the counterweight plate, and between the second swing arm and the counterweight plate. The well-washing pump can be inserted into the axis of the sampling unit. A locking structure is provided on the inner circumferential wall of the pressure ring. An extension plate extends from the inner edge of the pressure ring towards the center. The locking structure includes a buckle installed on the inner circumferential wall of the extension plate. The buckle has an inner diameter that can elastically expand and contract radially. When the well-washing pump is inserted into the axis of the sampling unit, the pressure ring is locked to the well-washing pump by the locking structure. The sampling unit also includes a plug. The sampling bottle has a structure with one end closed and one end open. The plug seals the well-washing pump. The sampling unit includes a sampling bottle with a stopper that is slidably engaged with a counterweight plate around the rotation center of the first end of the first swing arm. The sampling bottle connected to the second swing arm also has a stopper that is slidably engaged with a counterweight plate around the rotation center of the first end of the second swing arm. The sampling unit further includes a slide block fixedly connected to the counterweight plate. The slide block has a ring-shaped structure and is coaxially positioned below the counterweight plate. A pressure ring is fitted onto the outside of the slide block. The slide block has a groove, and the stopper has a sliding shaft slidably installed in the groove. The groove on the stopper of the sampling bottle connected to the first swing arm is an arc-shaped groove centered on the rotation center of the first end of the first swing arm. The sampling bottle connected to the second swing arm also has a stopper that is slidably engaged with a counterweight plate around the rotation center of the first end of the second swing arm. The sliding groove for the plug body is an arc-shaped groove centered on the rotation center of the first end of the second swing arm. The sampling bottle is hinged to the second end of the first / second swing arm near the closed end. The bottom wall of the sliding groove near the counterweight plate has a locking hole that communicates with the sliding groove. When the sliding shaft slides into the locking hole, the sliding shaft can engage with the locking hole. The pressure ring is located below the counterweight plate and above the sampling bottle. The bottom of the counterweight plate and the end of the pressure ring near the counterweight plate are provided with a top pressure airbag. The counterweight plate is also equipped with an air inlet pipe that communicates with the top pressure airbag. By moving the pressure ring away from the counterweight plate and downward, the pressure ring is pressed down and a downward pressure is applied to the open end of the sampling bottle.

2. The groundwater stratified sampler according to claim 1, characterized in that: The slide block has two symmetrical sliding grooves on both sides of the plug body. The slide shaft includes a shaft block one, a shaft block two, and an elastic element. Shaft block one and shaft block two are symmetrically and slidably arranged on both sides of the plug body. The elastic element is arranged between shaft block one and shaft block two. The elastic element applies a spring force to drive shaft block one and shaft block two to move in opposite directions, so that shaft block one and shaft block two are slidably installed in the two sliding grooves on the slide block. When the slide shaft slides into the engagement hole, the elastic force of the elastic element drives shaft block one and shaft block two to be inserted into the engagement holes of the two sliding grooves respectively.

3. The groundwater stratified sampler according to claim 1, characterized in that: The sampling unit also includes a tailstock, which is installed on the closed end of the sampling bottle. The tailstock is provided with an end shaft, and the end shaft is hinged to the second end of the first swing arm / second swing arm. At the same time, the tailstock protrudes axially from the second end of the first swing arm / second swing arm.

4. The groundwater stratified sampler according to claim 3, characterized in that: The tailstock includes a sleeve and a tail cap. The sleeve is fitted onto the closed end of the sampling bottle, and the tail cap is detachably connected to the sleeve and located at the bottom of the sampling bottle. The end shaft is disposed on the outer peripheral wall of the sleeve.

5. The groundwater stratified sampler according to claim 4, characterized in that: The tail cover includes a base, a sliding end, and a connecting post. The tail cover has a sliding layer in its cross-sectional direction, which allows the tail cover to be separated into a base and a sliding end that can be assembled into a whole. The base is close to the sleeve. The sliding layer has a stop protrusion at one end near the base, and the base has a locking protrusion at one end near the sliding layer. The locking protrusion is located above the stop protrusion, that is, on the side of the stop protrusion close to the counterweight plate. The connecting post is made of elastic material and is connected between the base and the sliding end along the axial direction of the tail cover.

6. The groundwater stratified sampler according to any one of claims 1-5, characterized in that: A limiting spring is connected to the first swing arm / second swing arm connected to the sampling bottle, and the limiting spring is located on the side of the sampling bottle away from the counterweight plate.

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