A sampling device for detecting groundwater pollutants

Abstract

This invention relates to the field of groundwater sampling devices, and more particularly to a sampling device for detecting groundwater pollutants. The technical solution includes: a rope and multiple samplers detachably mounted on the rope. Each sampler has a flow hole allowing water to pass through it. A contraction structure includes a first pull rope and a first control rope connected to the first pull rope. A sealing structure is installed inside the upper and lower ends of each sampler. The sealing structure includes a flexible, annular membrane, on which a second, annular pull rope is fitted. This invention reduces mixing of water layers at different depths, prevents disruption of the natural stratification of the water body, and allows for large-scale sampling of the water body in a single operation. This prevents the problem of small water samples affecting the accuracy, representativeness, and reliability of the analysis results, and avoids the problem of repeated water sampling exacerbating water body interference.

Description

Technical Field

[0001] This invention relates to the field of groundwater sampling device technology, and in particular to a sampling device for detecting groundwater pollutants. Background Technology

[0002] Groundwater contaminant detection sampling devices are tools used to collect groundwater samples to analyze the concentration of contaminants. The sampling device works by lowering the sampler into the well via a rope, collecting a water sample after reaching the target depth. It has the advantages of simple structure, low cost, and ease of operation.

[0003] Groundwater bodies typically exhibit stratification. Due to differences in temperature, salinity, or pollutant concentration, water at different depths may have varying densities and contain different chemical compositions. Water at different depths may originate from different sources or be affected by different pollution sources. Sampling at a single depth cannot comprehensively reflect the groundwater condition. To comprehensively assess groundwater pollution, it is necessary to understand the distribution of pollutants at different depths. Therefore, sampling at different depths is required. Multiple samplers can be installed on ropes to simultaneously sample water at different depths. However, when the samplers enter the water, they may disturb the water sample, causing mixing between water layers at different depths and disrupting the natural stratification of the water body. The sampling results may not accurately reflect the pollutant concentration at the target depth. In stratified water bodies, mixing can distort the data. Disturbance can suspend sediment from the bottom into the water. Sediments may adsorb pollutants, leading to inflated test results.

[0004] The degree of disturbance to the water body caused by a sampler is mainly determined by the sampler's discharge volume and the contact area between the sampler and the water body. A smaller volume entering the water body results in a smaller discharge volume and a smaller impact on the water body. The smaller the volume of water discharged also reduces the amount of flow and turbulence generated. Samplers with a smaller contact area generally have a smaller impact on the water body. This is because a smaller contact area results in less friction between the sampler and the water body, generating less turbulence and disturbance upon entry, thus better preserving the natural state of the water body. However, excessively reducing the sampler's discharge volume and contact area will result in a smaller sample volume per sampling. In other words, the sampler's discharge volume and contact area are directly proportional to the amount of water sampled per sampling. A smaller sample volume will affect the accuracy, representativeness, and reliability of the analytical results. Multiple samplings will exacerbate the disturbance to the water body. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by proposing a sampling device for detecting groundwater pollutants that reduces the disturbance of the sampler to the water body and can perform a large number of samples from the water body in a single operation.

[0006] The technical solution of the present invention: a sampling device for detecting groundwater pollutants, comprising:

[0007] A rope and multiple samplers detachably mounted on the rope, each sampler having a flow hole that allows water to pass through and through the sampler;

[0008] The sampler consists of multiple connecting plates arranged in a circular array. Side sealing plates are slidably installed between two adjacent connecting plates. Elastic rings with elasticity are fixedly installed at both the upper and lower ends of the sampler.

[0009] A shrinking structure, comprising a first pull rope and a first control rope connected to the first pull rope knot, wherein the first pull rope is looped around the sampler in a circular shape to limit the diameter of the sampler, and the tension of the first control rope controls the diameter of the circular ring formed by the first pull rope.

[0010] The sealing structure installed inside the upper and lower ends of the sampler includes a flexible, annular soft membrane. A second, annular pull rope is fitted on the soft membrane, and a second control rope is connected to the second pull rope by a knot. The second control rope controls the soft membrane to close.

[0011] Optionally, the retraction structure further includes a first connector fixedly installed on the connecting plate. The first connector has a first through hole. The first pull rope forms a circle through multiple first through holes. One end of the first pull rope is fixedly installed with a limiting head with a diameter larger than the first through hole. The other end of the first pull rope has a knot, and the knot is fixedly connected to the first control rope.

[0012] Optionally, the bottom end of the first control rope is fixedly connected to the bottom end of the rope, and the top end of the first control rope is tightened.

[0013] Optionally, the sealing structure includes an elastic connecting ring fixedly mounted on an elastic ring, the top of the connecting ring having an installation groove, the bottom of the soft membrane being fixedly connected to the top of the installation groove, and a plurality of second connectors being fixedly mounted around the soft membrane, each second connector having a second through hole, and the second pull rope passing through the plurality of second through holes.

[0014] Optionally, the bottom end of the second pull rope is provided with a circular sleeve, and the other end of the second pull rope passes through the circular sleeve and is detachably connected to the second control rope. Multiple airbags are fixedly installed on the inner wall of the soft membrane, and the multiple airbags are arranged in a cylindrical array with their heights decreasing sequentially.

[0015] Optionally, the bottom of the elastic ring is provided with a groove, both ends of the side sealing plate are located inside the groove, the connecting plate is provided with a slot, and the side sealing plate is slidably installed inside the slot.

[0016] Optionally, a counterweight ball is fixedly installed at the bottom of the rope, a connecting buckle is detachably installed on the rope, the sampler is connected to the rope through the connecting buckle, and a balance ball is detachably installed on the rope and located on one side of the sampler.

[0017] Optionally, a tripod is connected to the rope, and a line-laying mechanism is installed inside the tripod. The line-laying mechanism controls the rope to move synchronously with the first control rope and the second control rope, and controls the tension of the first control rope and the second control rope.

[0018] Optionally, the line feeding mechanism includes two first drive wheels rotatably mounted inside the tripod, each of the two first drive wheels having a meshing gear fixedly mounted on it, one of the gears having a first friction plate fixedly mounted on it, the tripod having a first lead screw internally threadedly connected to it, a second friction plate rotatably mounted on the first lead screw, a drive shaft fixedly mounted on one of the first drive wheels, a second drive wheel fixedly mounted on the drive shaft, a second lead screw threadedly connected to the tripod, a first wheel seat rotatably mounted on the second lead screw and slidably connected to the tripod, and a third drive wheel rotatably mounted on the first wheel seat and engaging with the second drive wheel;

[0019] A fourth drive wheel is fixedly mounted on the drive shaft, a third lead screw is threaded onto the tripod, a second wheel seat that is rotatably mounted on the third lead screw and slidably connected to the tripod, and a fifth drive wheel that cooperates with the fourth drive wheel is rotatably mounted on the second wheel seat.

[0020] The rope is located between the two first drive wheels, the first control rope is located between the second and third drive wheels, and the second control rope is located between the fourth and fifth drive wheels.

[0021] Optionally, the tripod is fixedly equipped with two sets of clamping components at different heights. Each clamping component includes a first clamping block fixedly installed on the tripod, a sliding rod fixedly installed on the first clamping block and a fourth lead screw rotatably installed on the first clamping block, and a second clamping block slidably installed on the sliding rod and threadedly connected to the fourth lead screw. The contact surfaces of the first and second clamping blocks are provided with through holes for the rope, the first control rope and the second control rope to pass through, and the diameter of the through holes is smaller than the diameter of the rope, the first control rope and the second control rope, respectively.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] The sampler of this invention is provided with a flow hole, which reduces the drainage volume of the sampler's internal volume compared to traditional samplers, thereby effectively reducing the sampler's interference with the water body. Furthermore, the shrinking structure reduces the contact area between the sampler and the water body when the sampler enters the water body, further reducing the interference caused by the sampler. Moreover, when the sampler is lifted, the flow hole can be blocked by the sealing structure, ensuring that the sampler is taken out of the well in a sealed state.

[0024] In summary, this invention reduces disturbance to water bodies, minimizes mixing of water layers at different depths, prevents disruption of the natural stratification of water bodies, and allows for large-scale sampling of water bodies in a single operation. This prevents the problem of small water samples affecting the accuracy, representativeness, and reliability of analysis results, and avoids the problem of repeated water sampling exacerbating the interference with water bodies. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the sampling device;

[0026] Figure 2 This is a schematic diagram of the sampler after the soft membrane is sealed.

[0027] Figure 3 This is a schematic diagram of the sampler when the soft membrane is not sealed.

[0028] Figure 4 This is a schematic diagram of the sampler's structure;

[0029] Figure 5 for Figure 3 Enlarged view of a portion of point A in the middle;

[0030] Figure 6 This is a schematic diagram of the soft membrane structure;

[0031] Figure 7 This is a schematic diagram of the contraction structure;

[0032] Figure 8 for Figure 7 A magnified view of a section at point B in the middle;

[0033] Figure 9 This is a schematic diagram of the sealed structure;

[0034] Figure 10 for Figure 9 A magnified view of a section at point C;

[0035] Figure 11 This is a schematic diagram of the structure of an elastic ring;

[0036] Figure 12 This is a structural diagram of a tripod;

[0037] Figure 13 Schematic diagram of the wire feeding mechanism Figure 1 ;

[0038] Figure 14 Schematic diagram of the wire feeding mechanism Figure 2 ;

[0039] Figure 15 This is a schematic diagram of the clamping component.

[0040] Reference numerals: 1. Rope; 101. Counterweight ball; 102. Connecting buckle; 103. Balance ball; 2. Sampler; 201. Connecting plate; 202. Groove; 203. Side sealing plate; 204. Flow hole; 205. Elastic ring; 206. Groove; 3. Contraction structure; 301. First perforation; 302. First pull rope; 303. Limiting head; 304. First control rope; 305. Knot; 306. First connector; 4. Sealing structure; 401. Connecting ring; 402. Mounting groove; 403. Soft membrane; 404. Second connector; 405. Second perforation; 406. Second pull rope; 40 7. Circular sleeve; 408. Second control rope; 409. Airbag; 5. Tripod; 501. First drive wheel; 502. Gear; 503. First friction plate; 504. First lead screw; 505. Second friction plate; 506. Drive shaft; 507. Second drive wheel; 508. Second lead screw; 509. First wheel seat; 510. Third drive wheel; 511. Fourth drive wheel; 512. Third lead screw; 513. Second wheel seat; 514. Fifth drive wheel; 6. Clamping component; 601. First pressure block; 602. Second pressure block; 603. Slide rod; 604. Fourth lead screw; 7. Well; 8. Water body. Detailed Implementation

[0041] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1, as Figures 1 to 11 As shown, the present invention proposes a sampling device for detecting groundwater pollutants, comprising a rope 1 and multiple samplers 2 detachably mounted on the rope 1. Each sampler 2 has a flow hole 204 that allows water to pass through it. Existing samplers 2 are generally enclosed boxes. When such samplers 2 enter the water body, the drainage volume of the sampler 2 is equal to the sum of its volume and the total volume of its material. Therefore, the drainage volume of existing samplers 2 is relatively large, causing significant interference to the water body 8. The present invention, by providing a flow hole in the sampler 2, allows water to pass through the sampler when it enters the water body 8. Compared to traditional samplers 2, this reduces the drainage volume of the sampler 2's internal volume, thus effectively reducing the interference of the sampler 2 on the water body.

[0043] It should be noted that as sampler 2 gradually enters the water body 8, the water body 8 already present in the flow hole 204 will gradually rise, eventually bringing the water body 8 inside sampler 2 into a corresponding state with the water body 8 outside sampler 2. This process involves the basic principles of fluid statics. When sampler 2 is inserted into the water body 8, the pressure of the water inside and outside sampler 2 tends to be balanced. According to the principles of fluid statics, at the same depth, the hydrostatic pressure of the water body 8 inside and outside sampler 2 is equal. To achieve pressure balance, the water level inside sampler 2 will gradually adjust until it matches the water level outside sampler 2. This makes the water body 8 at various depths inside the flow hole 204 correspond to the height of the water body 8 inside well 7. At this point, sealing both ends of sampler 2 allows the water inside sampler 2 to be removed.

[0044] Furthermore, the sampler 2 is composed of multiple connecting plates 201 arranged in a circular array. A side sealing plate 203 is slidably installed between two adjacent connecting plates 201. The connecting plates are provided with slots 202, and the side sealing plate 203 is slidably installed inside the slots 202. The side sealing plate 203 can be moved into or away from the slot 202, thereby increasing or decreasing the diameter of the entire sampler 2. When the diameter of the sampler 2 is reduced, the contact area between the sampler 2 and the water body 8 will be reduced, thus reducing the interference to the water body. When the sampler 2 reaches the specified depth, the diameter of the sampler 2 is expanded, allowing the sampler 2 to hold more water. This reduces the disturbance to the water body when the sampler 2 enters the water body 8 and ensures the amount of water collected in a single sampling. Both the upper and lower ends of the sampler 2 are fixedly installed with elastic rings 205. The bottom of the elastic rings 205 is provided with a groove 206. The two ends of the side sealing plate 203 are located inside the groove 206. Through the setting of the elastic rings 205, when the sampler 2 is not restrained by external force, the side sealing plate 203 can be moved to the outside of the slot 202, allowing the diameter of the sampler 2 to expand to the maximum state.

[0045] The sampling device in this embodiment also includes a shrinking structure 3, which includes a first pull rope 302 and a first control rope 304 connected to the first pull rope 302. The first pull rope 302 is looped around the sampler 2 in a circular shape to limit the diameter of the sampler 2. The tension of the first control rope 304 controls the diameter of the loop formed by the first pull rope 302. When the first pull rope 302 is tightened, the size of the circle formed by the first pull rope 302 around the sampler 2 will decrease. This allows the diameter of the sampler 2 to be restricted by the first pull rope 302, thus reducing the diameter of the sampler 2 and ensuring that the sampler 2 enters the water body 8 with a small diameter, thereby reducing the disturbance of the water body 8 by the sampler 2.

[0046] Since the first control rope 304 is connected to the first pull rope 302, the elastic ring 205 will cause the first pull rope 302 to pull the first control rope 304. When the first pull rope 302 is in a taut state, it cannot pull the first control rope 304, thus preventing the circle formed by the first pull rope 302 from expanding. This circle limits the sampler 2, preventing it from expanding. However, once the sampler 2 is in position, the tension on the first control rope 304 is released. At this point, the first pull rope 302 can then move the first control rope 304, allowing the circle formed by the first control rope 304 to expand, thereby enabling the sampler 2 to expand.

[0047] Furthermore, the shrinking structure also includes a first connector 306 fixedly installed on the connecting plate 201. The first connector 306 has a first through hole 301. The first pull rope 302 forms a circle through multiple first through holes 301. One end of the first pull rope 302 is fixedly installed with a limiting head 303 with a diameter larger than the first through hole 301. The other end of the first pull rope 302 has a knot 305, which is fixedly connected to the first control rope 304. When the knot 305 is pulled, due to the setting of the limiting head 303, the length of the first pull rope 302 will shrink, thereby reducing the size of the circle formed by the first pull rope 302 around the sampler 2, reducing the diameter of the sampler 2 to its limit, and then the first pull rope 302 can be tied to the first control rope 304.

[0048] It is worth noting that the bottom end of the first control rope 304 is fixedly connected to the bottom end of the rope 1, and the top end of the first control rope 304 is taut. A counterweight ball 101 is fixedly installed at the bottom of the rope 1, and a connecting buckle 102 is detachably installed on the rope 1. The sampler 2 is connected to the rope 1 through the connecting buckle 102, and a balance ball 103 is detachably installed on the rope 1 and located on one side of the sampler 2. The bottom end of the first control rope 304 will be taut by the counterweight ball 101, and the top end of the first control rope 304 will also be taut, thus preventing the first pull rope 302 from pulling the first control rope 304. Since the sampler 2 is installed on one side of the rope 1, the rope 1 may tilt. The balance ball 103 can balance the gravity on both sides of the rope 1, keeping the rope 1 always vertical and keeping the flow hole 204 and the water body always vertical, thereby reducing the disturbance of the sampler 2 to the water body.

[0049] The sampling device in this embodiment also includes a sealing structure 4 installed inside the upper and lower ends of the sampler 2. The sealing structure 4 includes a flexible, annular membrane 403. A second, annular pull rope 406 is fitted onto the membrane 403. A second control rope 408 is connected to the second pull rope 406. The second control rope 408 controls the membrane 403 to close. When the sampler 2 enters the water body, the membrane 403 is located inside the sampler 2 and will not interfere with the water body. It also ensures that the flow hole 204 does not change diameter, thus ensuring the smooth flow of water 8 inside the flow hole 204 and reducing the interference caused by the flow hole 204 to the water body 8. When the sampler 2 is retrieved, the membrane 403 needs to be moved to the outside of the sampler 2 and closed. The closed membrane 403 can seal both ends of the sampler 2, preventing the water 8 inside the sampler 2 from flowing out or exchanging with water at other depths when the sampler 2 rises.

[0050] Furthermore, the sealing structure 4 includes an elastic connecting ring 401 fixedly installed on the elastic ring 205. The top of the connecting ring 401 is provided with a mounting groove 402. The bottom of the soft membrane 403 is fixedly connected to the top of the mounting groove 402. Multiple second connectors 404 are fixedly installed around the soft membrane 403. The second connectors 404 are provided with second through holes 405. The second pull rope 406 passes through the multiple second through holes 405. When the second control rope 408 is pulled, the pulling force will first move the soft membrane 403 from the mounting groove 402 to the outside. With the continued pulling of the second control rope 408, the end of the second pull rope 406 connected to the second control rope 408 will extend, thereby reducing the size of the circle formed by the second pull rope 406 around the soft membrane 403. As the second control rope 408 continues to move, the circle formed by the second pull rope 406 around the soft membrane 403 will gradually shrink, eventually sealing the soft membrane 403 and sealing both ends of the sampler 2. At this time, the second control rope 408 is in a taut state and rises with the rope 1, so that the sampler 2 can be taken out from the well 7 while ensuring that the sampler 2 is sealed.

[0051] The second pull rope 406 has a circular sleeve 407 at its bottom end. The other end of the second pull rope 406 passes through the circular sleeve 407 and is detachably connected to the second control rope 408. Multiple airbags 409 are fixedly installed on the inner wall of the soft membrane 403. As the soft membrane 403 is gradually sealed, the multiple airbags 409 will come into contact with each other and squeeze, thereby achieving a more airtight seal. The multiple airbags 409 form a cylindrical array with decreasing heights, which can extend the sealing height inside the soft membrane 403 and improve the sealing effect.

[0052] The working principle of this embodiment is as follows: when the first pull rope 302 is tightened, the size of the circle formed by the first pull rope 302 around the sampler 2 will be reduced. In this way, the diameter of the sampler 2 can be constrained by the first pull rope 302, which can reduce the diameter of the sampler 2 and ensure that the sampler 2 enters the water body 8 with a small diameter, thereby reducing the disturbance of the sampler 2 to the water body 8.

[0053] As the sampler 2 gradually enters the water body 8, the water body 8 already present in the flow hole 204 will gradually move upward, eventually bringing the water body 8 inside the sampler 2 into a corresponding state with the water body 8 outside the sampler 2. Compared to a traditional sampler 2, this reduces the amount of water drained from the internal volume of the sampler 2, thus effectively reducing the interference of the sampler 2 on the water body.

[0054] Once the sampler 2 is in position, the tension of the first control rope 304 is released. At this time, the first pull rope 302 can then drive the first control rope 304 to move, thereby expanding the circle formed by the first control rope 304, which in turn allows the sampler 2 to expand and increase the quality of water collected by the sampler 2.

[0055] After the water sample is collected, pulling the second control rope 408 will cause the end of the second pull rope 406 connected to the second control rope 408 to extend, thereby reducing the size of the circle formed by the second pull rope 406 around the soft membrane 403. This allows the circle formed by the second pull rope 406 around the soft membrane 403 to gradually shrink, eventually sealing the soft membrane 403 and making the soft membrane 403 seal both ends of the sampler 2. At this time, the second control rope 408 is in a taut state and is raised along with the rope 1. This allows the sampler 2 to be removed from the well 7 while ensuring that the sampler 2 is sealed.

[0056] Example 2, as Figures 12 to 15 As shown, based on Embodiment 1, a tripod 5 is connected to the rope 1, and a line-laying mechanism is installed inside the tripod 5. The line-laying mechanism controls the rope 1 to move synchronously with the first control rope 304 and the second control rope 408, and controls the tension of the first control rope 304 and the second control rope 408. Since the first control rope 304 needs to be kept taut at all times, its descent amplitude needs to be consistent with that of the rope 1. When the descent amplitude of the first control rope 304 is greater than that of the rope 1, the top of the first control rope 304 will be loosened, thus preventing it from being kept taut. Conversely, when the descent amplitude of the first control rope 304 is less than that of the first rope 1, the first rope 1 will not be able to descend effectively under the tension of the first control rope 304. Furthermore, the descent amplitude of the second control rope 408 needs to be greater than or equal to that of the rope 1; otherwise, the second control rope 408 will prematurely stretch the membrane 403.

[0057] Furthermore, the line-laying mechanism includes two first drive wheels 501 rotatably mounted inside the tripod 5. The rope 1 is located between the two first drive wheels 501. Each of the two first drive wheels 501 is fixedly mounted with a meshing gear 502. When one of the first drive wheels 501 rotates, the other first drive wheel 501 will rotate synchronously in the opposite direction, thereby causing the rope 1 to rise or fall. A first friction plate 503 is fixedly mounted on one of the gears 502. A first lead screw 504 is internally threaded onto the tripod 5. A second friction plate 505 is rotatably mounted on the first lead screw 504. The second friction plate 505 is slidably connected to the tripod 5. By rotating the first lead screw 504, the second friction plate 505 can be moved, and the distance between the first friction plate 503 and the second friction plate 505 can be adjusted. When the first friction plate 503 and the second friction plate 505 are in contact, the friction between the first friction plate 503 and the second friction plate 505 will prevent the first drive wheel 501 from rotating, thereby preventing the rope 1 from moving.

[0058] A drive shaft 506 is fixedly mounted on one of the first drive wheels 501, a second drive wheel 507 is fixedly mounted on the drive shaft 506, a second lead screw 508 is threadedly connected to the tripod 5, a first wheel seat 509 that is slidably connected to the tripod 5 is rotatably mounted on the second lead screw 508, and a third drive wheel 510 that cooperates with the second drive wheel 507 is rotatably mounted on the first wheel seat 509. The first control rope 304 is located between the second drive wheel 507 and the third drive wheel 510. Rotating the second lead screw 508 can adjust the distance between the third drive wheel 510 and the second drive wheel 507. When the third drive wheel 510 and the second drive wheel 507 press the first control rope 304 together, the first control rope 304 can move as the third drive wheel 510 and the second drive wheel 507 rotate. The transmission shaft 506 can make the second drive wheel 507 and the first drive wheel 501 rotate synchronously, so that the first control rope 304 rises and falls with the rise and fall of the rope 1. When it is necessary to release the tension of the first control rope 304, simply rotate the second lead screw 508 to separate the third drive wheel 510 and the second drive wheel 507, so that the first control rope 304 can move freely up and down.

[0059] Furthermore, a fourth drive wheel 511 is fixedly mounted on the drive shaft 506, and a third lead screw 512 is threadedly connected to the tripod 5. A second wheel seat 513, which is slidably connected to the tripod 5, is rotatably mounted on the third lead screw 512. A fifth drive wheel 514, which cooperates with the fourth drive wheel 511, is rotatably mounted on the second wheel seat 513. The second control rope 408 is located between the fourth drive wheel 511 and the fifth drive wheel 514. Therefore, the second control rope 408 can be raised and lowered along with the rope 1 by controlling the third lead screw 512, and the second control rope 408 can also move freely.

[0060] like Figures 1 to 2 As shown, in this embodiment, two sets of clamping members 6 at different heights are fixedly installed on the tripod 5. The clamping member 6 includes a first clamping block 601 fixedly installed on the tripod 5, a slide rod 603 fixedly installed on the first clamping block 601 and a fourth lead screw 604 rotatably installed on it, and a second clamping block 602 slidably installed on the slide rod 603 and threadedly connected to the fourth lead screw 604. The contact surfaces of the first clamping block 601 and the second clamping block 602 are provided with through holes for the rope 1, the first control rope 304 and the second control rope 408 to pass through. The diameter of the through holes is smaller than the diameter of the rope 1, the first control rope 304 and the second control rope 408, respectively. When a sampler 2 enters the water body 8, the next sampler 2 needs to be installed on the rope 1. When installing the sampler 2, the rope 1 will shake, which will cause the sampler 2 inside the water body 8 to shake, thus disturbing the water body. If the sampler 2 is installed in advance, the tension of the first control rope 304 cannot be guaranteed.

[0061] When a sampler 2 enters the water body 8, to install subsequent samplers 2, the fourth lead screw 604 located below needs to be rotated first, so that the first pressure block 601 and the second pressure block 602 clamp the rope 1, the first control rope 304 and the second control rope 408. At this time, the upper rope 1, the first control rope 304 and the second control rope 408 continue to move downward. At this time, the rope 1 between the two clamping parts 6 will remain in a slack state, while the rope 1 located on the lower clamping part 6 will be tensioned by the lower clamping part 6. At this time, the sampler 2 can be installed between the two clamping parts 6 or above the upper clamping part 6. This will not interfere with the rope located inside the well 7. Since the first pressure block 601 and the second pressure block 602 have notches, the connecting buckle 102 can pass through the notches, so that the sampler 2 can pass through the clamping part 6. At this time, the rope 1 above the lower clamping part 6 can remain tensioned, and the lower clamping part 6 can release the clamping of the rope 1, so that the installed sampler 2 can be lowered.

[0062] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A sampling device for detecting groundwater pollutants, characterized in that, include: A rope (1) and a plurality of samplers (2) detachably mounted on the rope (1), wherein the samplers (2) have flow holes (204) for water to pass through and through the samplers (2). The sampler (2) is composed of multiple connecting plates (201) arranged in a circular array. A side sealing plate (203) is slidably installed between two adjacent connecting plates (201). Both the upper and lower ends of the sampler (2) are fixedly installed with elastic rings (205) that can be elastic. The shrinking structure (3) includes a first pull rope (302) and a first control rope (304) connected to the first pull rope (302) by a knot. The first pull rope (302) is looped on the sampler (2) to limit the diameter of the sampler (2). The tension of the first control rope (304) controls the diameter of the loop formed by the first pull rope (302). The sealing structure (4) installed inside the upper and lower ends of the sampler (2) includes a flexible ring-shaped soft membrane (403), on which a ring-shaped second pull rope (406) is sleeved. A second control rope (408) is connected to the second pull rope (406) by a knot. The second control rope (408) controls the soft membrane (403) to close. The retractable structure also includes a first connector (306) fixedly installed on the connecting plate (201). The first connector (306) is provided with a first through hole (301). The first pull rope (302) forms a circle through multiple first through holes (301). One end of the first pull rope (302) is fixedly installed with a limiting head (303) with a diameter larger than the first through hole (301). The other end of the first pull rope (302) is provided with a knot (305). The knot (305) is fixedly connected to the first control rope (304). The bottom end of the first control rope (304) is fixedly connected to the bottom end of the rope (1), and the top end of the first control rope (304) is tightened. The sealing structure (4) includes an elastic connecting ring (401) fixedly installed on the elastic ring (205). The top of the connecting ring (401) is provided with a mounting groove (402). The bottom of the soft membrane (403) is fixedly connected to the top of the mounting groove (402). A plurality of second connectors (404) are fixedly installed around the soft membrane (403). The second connectors (404) are provided with second through holes (405). The second pull rope (406) passes through the plurality of second through holes (405).

2. The sampling device for detecting groundwater pollutants according to claim 1, characterized in that, The bottom end of the second pull rope (406) is provided with a round sleeve (407). The other end of the second pull rope (406) passes through the round sleeve (407) and is detachably connected to the second control rope (408). Multiple airbags (409) are fixedly installed on the inner wall of the soft membrane (403). The multiple airbags (409) are arranged in a cylindrical array and their heights decrease sequentially.

3. A sampling device for detecting groundwater pollutants according to claim 2, characterized in that, The bottom of the elastic ring (205) is provided with a groove (206), and both ends of the side sealing plate (203) are located inside the groove (206). The connecting plate is provided with a slot (202), and the side sealing plate (203) is slidably installed inside the slot (202).

4. A sampling device for detecting groundwater pollutants according to claim 3, characterized in that, A counterweight ball (101) is fixedly installed at the bottom of the rope (1), and a connecting buckle (102) is detachably installed on the rope (1). The sampler (2) is connected to the rope (1) through the connecting buckle (102), and a balance ball (103) is detachably installed on the rope (1) and located on one side of the sampler (2).

5. A sampling device for detecting groundwater pollutants according to claim 4, characterized in that, A tripod (5) is connected to the rope (1), and a line-laying mechanism is installed inside the tripod (5). The line-laying mechanism controls the rope (1) to move synchronously with the first control rope (304) and the second control rope (408), and controls the tension of the first control rope (304) and the second control rope (408).

6. A sampling device for detecting groundwater pollutants according to claim 5, characterized in that, The wire feeding mechanism includes two first drive wheels (501) rotatably mounted inside a tripod (5), each of the two first drive wheels (501) being fixedly mounted with a meshing gear (502), one of the gears (502) being fixedly mounted with a first friction plate (503), the tripod (5) being internally threaded with a first lead screw (504), the first lead screw (504) being rotatably mounted with a second friction plate (505), one of the first drive wheels (501) being fixedly mounted with a drive shaft (506), the drive shaft (506) being fixedly mounted with a second drive wheel (507), the tripod (5) being threadedly connected with a second lead screw (508), the second lead screw (508) being rotatably mounted with a first wheel seat (509) slidably connected to the tripod (5), and the first wheel seat (509) being rotatably mounted with a third drive wheel (510) cooperating with the second drive wheel (507). A fourth drive wheel (511) is fixedly installed on the drive shaft (506), a third lead screw (512) is threaded onto the tripod (5), a second wheel seat (513) is rotatably installed on the third lead screw (512) and slidably connected to the tripod (5), and a fifth drive wheel (514) that cooperates with the fourth drive wheel (511) is rotatably installed on the second wheel seat (513). The rope (1) is located between the two first drive wheels (501), the first control rope (304) is located between the second drive wheel (507) and the third drive wheel (510), and the second control rope (408) is located between the fourth drive wheel (511) and the fifth drive wheel (514).

7. A sampling device for detecting groundwater pollutants according to claim 6, characterized in that, Two sets of clamping components (6) at different heights are fixedly installed on the tripod (5). The clamping component (6) includes a first clamping block (601) fixedly installed on the tripod (5). A slide rod (603) is fixedly installed on the first clamping block (601) and a fourth lead screw (604) is rotatably installed on it. A second clamping block (602) threadedly connected to the fourth lead screw (604) is slidably installed on the slide rod (603). The contact surfaces of the first clamping block (601) and the second clamping block (602) are provided with through holes for the rope (1), the first control rope (304) and the second control rope (408) to pass through. The diameter of the through holes is smaller than the diameter of the rope (1), the first control rope (304) and the second control rope (408), respectively.

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