Sampling device for underground water pollutant detection

Abstract

The invention relates to the technical field of underground water sampling devices, in particular to a sampling device for underground water pollutant detection. According to the technical scheme, the device comprises a rope and a plurality of samplers detachably installed on the rope, circulation holes allowing water to pass through and penetrate through the samplers are reserved in the samplers, the contraction structures comprise first pull ropes, first control ropes connected with the first pull ropes in a knotted mode and sealing structures installed in the upper ends and the lower ends of the samplers, and the first control ropes are connected with the first pull ropes in a knotted mode. The sealing structure comprises a soft film which is flexible to be in a circular ring shape, and the soft film is sleeved with a second pull rope which is in a circular ring shape. Mixing of water layers at different depths is reduced, natural layering of the water body is prevented from being damaged, a large amount of water can be sampled at a time, the problem that the accuracy, representativeness and reliability of an analysis result are affected due to the fact that the water sampling amount is small is solved, and the problem that water is aggravated and disturbed by multiple times of water sampling is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater sampling devices, and particularly to a sampling device for detecting groundwater pollutants. Background Art

[0002] The sampling device for detecting groundwater pollutants is a tool for collecting groundwater samples to analyze the pollutant concentration therein. The principle of the sampling device is: lowering the sampler into the well through a rope, and collecting the water sample after reaching the target depth. It has the advantages of simple structure, low cost and easy operation.

[0003] There is usually a layering phenomenon in groundwater bodies. Due to differences in temperature, salinity or pollutant concentration, the water bodies at different depths may have different densities and may contain different chemical components. The water bodies at different depths may come from different water sources or be affected by different pollution sources. Sampling at a single depth cannot comprehensively reflect the groundwater situation. In order to comprehensively evaluate the groundwater pollution situation, it is necessary to understand the distribution of pollutants at different depths. Therefore, it is necessary to sample the water at different depths. By installing multiple samplers on the rope, the water at different depths can be sampled simultaneously. However, when the sampler enters the water, it may disturb the water sample. The disturbance will cause the water layers at different depths to mix, destroying the natural layering of the water body. The sampling result cannot accurately reflect the pollutant concentration at the target depth. For water bodies with obvious layering, mixing will cause data distortion. The disturbance will cause the sediment at the bottom to suspend into the water body. The sediment may adsorb pollutants, resulting in a higher detection result.

[0004] The degree of disturbance of the sampler to the water body is mainly determined by the drainage volume of the sampler and the contact area between the sampler and the water body. The smaller the volume entering the water body, the smaller the discharged water volume, and the smaller the impact on the water body. The discharged water volume is also smaller, so less water flow and turbulence are generated. Samplers with a smaller contact area usually have a smaller impact on the water body. This is because the friction between the sampler with a smaller contact area and the water body is also smaller, and less turbulence and disturbance are generated when entering the water body, and the natural state of the water body can be better maintained. However, excessively reducing the drainage volume of the sampler and the contact area with the water body will result in a smaller single water sampling volume of the sampler, that is, the drainage volume of the sampler and the contact area with the water body are directly proportional to the size of the single water sampling volume. A smaller water sampling volume will affect the accuracy, representativeness and reliability of the analysis result. And multiple samplings will increase the disturbance to the water body. Summary of the Invention

[0005] The object of the present invention is to propose a sampling device for detecting groundwater pollutants that reduces the disturbance of the sampler to the water body and can sample a large amount of water at one time in view of the problems in the background art.

[0006] The technical solution of the present invention: A sampling device for detecting groundwater pollutants, comprising: A rope and a plurality of samplers detachably mounted on the rope, with flow holes for water to pass through and penetrate the samplers left inside the samplers; The sampler consists of a plurality of connecting plates arranged in a circular array, with side sealing plates slidably mounted between adjacent connecting plates, and elastic rings with elasticity are fixedly mounted at both the upper and lower ends of the sampler; A contraction structure, which includes a first pulling rope and a first control rope knotted to the first pulling rope. The first pulling rope is sleeved on the sampler in a circular shape to limit the diameter of the sampler, and the tension state of the first control rope controls the diameter of the circle formed by the first pulling rope; A sealing structure installed inside the upper and lower ends of the sampler, which includes a flexible circular soft film, a circular second pulling rope is sleeved on the soft film, a second control rope is knotted to the second pulling rope, and the second control rope controls the soft film to close its mouth.

[0007] Optionally, the contraction structure further includes a connection head fixedly mounted on the connecting plate. There is a first through hole on the first connection head. The first pulling rope forms a circle through a plurality of first through holes. A limiting head with a diameter larger than the first through hole is fixedly mounted at one end of the first pulling rope, and a knot is provided at the other end of the first pulling rope, and the knot is fixedly connected to the first control rope.

[0008] 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.

[0009] Optionally, the sealing structure includes an elastic connection ring fixedly mounted on the elastic ring. There is an installation groove at the top of the connection ring. The bottom of the soft film is fixedly connected to the top of the installation groove. A plurality of second connection heads are fixedly mounted around the soft film. There is a second through hole on the second connection head, and the second pulling rope passes through a plurality of the second through holes.

[0010] Optionally, a round sleeve is provided at the bottom end of the second pulling rope. The other end of the second pulling rope passes through the round sleeve and is detachably connected to the second control rope. A plurality of air bags are fixedly mounted on the inner wall of the soft film, and the plurality of air bags are arranged in a cylindrical array and the heights decrease in sequence.

[0011] Optionally, a groove is provided at the bottom of the elastic ring. Both ends of the side sealing plate are located inside the groove. There is a notch on the connecting plate, and the side sealing plate is slidably mounted inside the notch.

[0012] Optionally, a counterweight ball is fixedly mounted at the bottom of the rope. A connection buckle is detachably mounted on the rope. The sampler is connected to the rope through the connection buckle. A balance ball is detachably mounted on the rope on one side of the sampler.

[0013] Optionally, a tripod is connected to the rope, and a wire pay - out mechanism is installed inside the tripod. The wire pay - out mechanism controls the synchronous movement of the rope, the first control rope, and the second control rope, and controls the tension states of the first control rope and the second control rope.

[0014] Optionally, the wire pay - out mechanism includes two first driving wheels rotatably installed inside the tripod. Fixedly installed on both of the two first driving wheels are gears that mesh with each other. Fixedly installed on one of the gears is a first friction plate. Threadedly connected to the tripod is a first lead screw, and a second friction plate is rotatably installed on the first lead screw. Fixedly installed on one of the first driving wheels is a transmission shaft, and a second driving wheel is fixedly installed on the transmission shaft. Threadedly connected to the tripod is a second lead screw, and a first wheel seat slidably connected to the tripod is rotatably installed on the second lead screw. Rotatably installed on the first wheel seat is a third driving wheel that cooperates with the second driving wheel; Fixedly installed on the transmission shaft is a fourth driving wheel. Threadedly connected to the tripod is a third lead screw, and a second wheel seat slidably connected to the tripod is rotatably installed on the third lead screw. Rotatably installed on the second wheel seat is a fifth driving wheel that cooperates with the fourth driving wheel; The rope is located between the two first driving wheels, the first control rope is located between the second driving wheel and the third driving wheel, and the second control rope is located between the fourth driving wheel and the fifth driving wheel.

[0015] Optionally, two sets of pressing members at different heights are fixedly installed on the tripod. The pressing member includes a first pressing block fixedly installed on the tripod. A sliding rod is fixedly installed on the first pressing block and a fourth lead screw is rotatably installed. Slidably installed on the sliding rod is a second pressing block threadedly connected to the fourth lead screw. Through - holes for the rope, the first control rope, and the second control rope to pass through are provided on the contact surface between the first pressing block and the second pressing block, and the diameters of the through - holes are respectively smaller than the diameters of the rope, the first control rope, and the second control rope.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: The sampler of the present invention is provided with a circulation hole, which reduces the drainage volume of the internal volume of the sampler compared with the traditional sampler, and thus can effectively reduce the interference of the sampler on the water body. And through the contraction structure, the contact area between the sampler and the water body when the sampler enters the water body is reduced, further reducing the interference of the sampler on the water body. And when the sampler is lifted, the circulation hole can be blocked by the sealing structure to ensure that the sampler is taken out of the well in a sealed state; In summary, the present invention reduces the disturbance to the water body, reduces the mixing of water layers at different depths, prevents the destruction of the natural stratification of the water body, and can perform a large amount of sampling of the water body at one time, preventing the problems that less water intake will affect the accuracy, representativeness, and reliability of the analysis results, and avoiding the problem of aggravating the interference to the water body caused by multiple water intakes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the sampling device; Figure 2 is a schematic structural diagram of the sampler after the soft film is closed; Figure 3 is a schematic structural diagram of the sampler when the soft film is not closed; Figure 4 is a schematic structural diagram of the sampler; Figure 5 is Figure 3 a partial enlarged view of part A in Figure 6 is a schematic structural diagram of the soft film; Figure 7 is a schematic structural diagram of the contraction structure; Figure 8 is Figure 7 a partial enlarged view of part B in Figure 9 is a schematic structural diagram of the sealing structure; Figure 10 is Figure 9 a partial enlarged view of part C in Figure 11 is a schematic structural diagram of the elastic ring; Figure 12 is a schematic structural diagram of the tripod; Figure 13 is a schematic structural diagram of the wire releasing mechanism Figure 1 ; Figure 14 is a schematic structural diagram of the wire releasing mechanism Figure 2 ; Figure 15 is a schematic structural diagram of the pressing member.

[0018] Reference numerals: 1, rope; 101, counterweight ball; 102, connecting buckle; 103, balance ball; 2, sampler; 201, connecting plate; 202, notch; 203, side sealing plate; 204, through hole; 205, elastic ring; 206, groove; 3, contraction structure; 301, first perforation; 302, first pulling rope; 303, limiting head; 304, first control rope; 305, knot; 306, connecting head; 4, sealing structure; 401, connecting ring; 402, installation groove; 403, soft film; 404, second connecting head; 405, second perforation; 406, second pulling rope; 407, round sleeve; 408, second control rope; 409, airbag; 5, tripod; 501, first driving wheel; 502, gear; 503, first friction plate; 504, first lead screw; 505, second friction plate; 506, transmission shaft; 507, second driving wheel; 508, second lead screw; 509, first wheel seat; 510, third driving wheel; 511, fourth driving wheel; 512, third lead screw; 513, second wheel seat; 514, fifth driving wheel; 6, pressing member; 601, first pressing block; 602, second pressing block; 603, sliding rod; 604, fourth lead screw; 7, well; 8, water body. Detailed implementation manners

[0019] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1, as Figures 1 to 11 shown, a sampling device for detecting groundwater pollutants proposed by the present invention includes a rope 1 and a plurality of samplers 2 detachably installed on the rope 1. A through hole 204 for the water body to pass through and penetrate the sampler 2 is provided in the sampler 2. Existing samplers 2 are generally closed boxes. When such a sampler 2 enters the water body, the drainage volume of the sampler 2 is equal to the sum of the volume of the sampler 2 and the total volume of its material. Therefore, the drainage volume of the existing sampler 2 is relatively large, which will cause strong interference to the water body 8. However, by providing through holes in the sampler 2 of the present invention, when the sampler 2 enters the water body 8, the water body 8 can pass through the sampler, reducing the drainage volume of the internal volume of the sampler 2 compared with the traditional sampler 2, and thus effectively reducing the interference of the sampler 2 on the water body; It should be noted that when the sampler 2 gradually enters the water body 8, the water body 8 already existing in the flow-through hole 204 will gradually move upward, and finally the water body 8 inside the sampler 2 will reach a corresponding state with the water body 8 outside the sampler 2. This process involves the basic principle of hydrostatics. When the sampler 2 is inserted into the water body 8, the pressures of the water bodies inside and outside the sampler 2 will tend to balance. According to the hydrostatic principle, at the same depth, the hydrostatic pressures of the water bodies 8 inside and outside the sampler 2 are equal. To achieve pressure balance, the water level inside the sampler 2 will gradually adjust until it is the same as the water level outside the sampler 2. This makes the water bodies 8 at each depth inside the flow-through hole 204 correspond to the height of the water body 8 inside the well 7. At this time, by blocking both ends of the sampler 2, the water body inside the sampler 2 can be taken out.

[0021] Furthermore, the sampler 2 is composed of a plurality of connecting plates 201 arranged in a circular array. A side sealing plate 203 is slidably installed between adjacent connecting plates 201. The connecting plate is provided with a notch 202, and the side sealing plate 203 is slidably installed inside the notch 202. The side sealing plate 203 can be made to enter or move away from the notch 202, and thus the diameter of the entire sampler 2 can be enlarged or reduced. When the diameter of the sampler 2 is reduced, the contact area between the sampler 2 and the water body 8 will decrease, thereby reducing the interference with the water body. When the sampler 2 reaches the designated depth, by expanding the diameter of the sampler 2, more water body can be accommodated inside the sampler 2, which can reduce the disturbance to the water body 8 when the sampler 2 enters the water body 8 and ensure the single water body collection volume of the water body 8. Elastic rings 205 with elasticity are fixedly installed at both the upper and lower ends of the sampler 2. A groove 206 is provided at the bottom of the elastic ring 205. Both ends of the side sealing plate 203 are located inside the groove 206. Through the setting of the elastic ring 205, when the sampler 2 is not restricted by external forces, it can drive the side sealing plate 203 to move outward to the outside of the notch 202, and the diameter of the sampler 2 can be expanded to the maximum state.

[0022] It is worth noting that the side sealing plate 203 is elastic and not a rigid and inflexible hard plate. This is because: the curvature of a circle is inversely proportional to the radius. When the circular sampler 2 expands, the curvature becomes smaller. Through the elastic change of the side sealing plate 203, when the sampler 2 expands or contracts, the curvature of the side sealing plate 203 can change to meet the corresponding changes of the side sealing plate 203 as the circular sampler 2 expands.

[0023] The sampling device of this embodiment further includes a contraction structure 3. The contraction structure 3 includes a first drawstring 302 and a first control rope 304 knot-connected to the first drawstring 302. The first drawstring 302 is arranged in a circular ring around the sampler 2 to limit the diameter of the sampler 2. The tension state of the first control rope 304 controls the diameter of the circular ring formed by the first drawstring 302. When the first drawstring 302 is tightened, the size of the circle formed by the first drawstring 302 around the sampler 2 will shrink. Furthermore, the diameter of the sampler 2 can be restricted by the first drawstring 302, enabling the diameter of the sampler 2 to be reduced, ensuring that the sampler 2 enters the water body 8 in a state of small diameter, and reducing the disturbance of the sampler 2 to the water body 8. Since the first control rope 304 is connected to the first drawstring 302, the first drawstring 302 will pull the first control rope 304 under the action of the elastic ring 205. When the first drawstring 302 is in a tension state, the first drawstring 302 cannot pull the first control rope 304, thus preventing the circle formed by the first drawstring 302 from expanding, and the circle limits the sampler 2, so the sampler 2 cannot expand. When the sampler 2 is in place, the tension state of the first control rope 304 is cancelled. At this time, the first drawstring 302 can drive the first control rope 304 to move, thereby enabling the circle formed by the first control rope 304 to expand, and then enabling the sampler 2 to expand.

[0024] Furthermore, the contraction structure further includes a connector 306 fixedly installed on the connecting plate 201. The first connector 306 is provided with a first through hole 301. The first drawstring 302 forms a circle through a plurality of first through holes 301. A limiting head 303 with a diameter larger than the first through hole 301 is fixedly installed at one end of the first drawstring 302. A knot 305 is provided at the other end of the first drawstring 302, and the knot 305 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 drawstring 302 will contract, further reducing the size of the circle formed by the first drawstring 302 around the sampler 2, reducing the diameter of the sampler 2 to the limit, and tying the first drawstring 302 to the first control rope 304.

[0025] It should be noted 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 tightened. A counterweight ball 101 is fixedly installed at the bottom of the rope 1, 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 on one side of the sampler 2. The bottom end of the first control rope 304 will be tightened by the counterweight ball 101, and the top end of the first control rope 304 is also tightened, so that the first pulling rope 302 cannot pull 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, keep the rope 1 in a vertical state all the time, keep the through hole 204 in a vertical state with the water body all the time, and further reduce the disturbance of the sampler 2 to the water body.

[0026] The sampling device of this embodiment further includes a sealing structure 4 installed inside the upper and lower ends of the sampler 2. The sealing structure 4 includes a flexible circular soft film 403. A circular second pulling rope 406 is sleeved on the soft film 403. A second control rope 408 is knotted on the second pulling rope 406, and the second control rope 408 controls the soft film 403 to close. When the sampler 2 enters the water body, the soft film 403 is located inside the sampler 2, will not interfere with the water body, and ensures that the through hole 204 does not change in diameter, ensuring the smooth flow of the water body 8 inside the through hole 204 and reducing the interference of the through hole 204 on the water body 8. When the sampler 2 is recovered, it is necessary to move the soft film 403 to the outside of the sampler 2 and make the soft film 403 close. The closed soft film 403 can seal the two ends of the sampler 2, preventing the water body 8 inside the sampler 2 from flowing out or exchanging with the water bodies at other depths when the sampler 2 rises.

[0027] Further, the sealing structure 4 includes an elastic connection ring 401 fixedly installed on the elastic ring 205. An installation groove 402 is provided at the top of the connection ring 401. The bottom of the soft film 403 is fixedly connected to the top of the installation groove 402. A plurality of second connection heads 404 are fixedly installed around the soft film 403. A second through hole 405 is provided on the second connection head 404. The second pull rope 406 passes through a plurality of second through holes 405. When the second control rope 408 is pulled, under the action of the pulling force, first, the soft film 403 will be driven to move from the installation groove 402 to the outside. And under the continuous pulling of the second control rope 408, the end of the second pull rope 406 connected to the second control rope 408 will be extended, thereby reducing the size of the circle formed by the second pull rope 406 around the soft film 403. As the second control rope 408 continues to move, the circle formed by the second pull rope 406 around the soft film 403 can be gradually reduced, and finally the soft film 403 is sealed, so that the soft film 403 seals both ends of the sampler 2. At this time, the second control rope 408 is in a tensioned state, and the second control rope 408 rises along with the rope 1, so that the sampler 2 can be taken out of the well 7 while ensuring the sealing of the sampler 2.

[0028] Wherein, a round sleeve 407 is provided at the bottom end of the second pull rope 406. 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. A plurality of air bags 409 are fixedly installed on the inner wall of the soft film 403. Through the arrangement of the air bags 409, in the process of gradually sealing the soft film 403, the plurality of air bags 409 will contact and squeeze each other, thereby realizing a more airtight seal. And the plurality of air bags 409 form a cylindrical array and their heights decrease in sequence, which can extend the sealing height inside the soft film 403 and improve the sealing effect.

[0029] 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. Thus, the diameter of the sampler 2 can be restricted by the first pull rope 302, and the diameter of the sampler 2 can be reduced to ensure that the sampler 2 enters the water body 8 in a small-diameter state, which can reduce the disturbance of the sampler 2 to the water body 8. When the sampler 2 gradually enters the water body 8, the water body 8 already existing in the circulation hole 204 will gradually move upward, and finally the water body 8 inside the sampler 2 and the water body 8 outside the sampler 2 reach a corresponding state. Compared with the traditional sampler 2, the drainage volume of the internal volume of the sampler 2 is reduced, and thus the interference of the sampler 2 to the water body can be effectively reduced. When the sampler 2 is in place, the tension state of the first control rope 304 is cancelled. At this time, the first pulling rope 302 can drive the first control rope 304 to move, so that the circle formed by the first control rope 304 can be expanded, and then the sampler 2 can be expanded, increasing the quality of water collection by the sampler 2. When the water collection is completed, pulling the second control rope 408 will drive one end of the second pulling rope 406 connected to the second control rope 408 to extend. As a result, the size of the circle formed by the second pulling rope 406 around the soft film 403 can be reduced, and the circle formed by the second pulling rope 406 around the soft film 403 can be gradually reduced. Finally, the soft film 403 is sealed, and the soft film 403 seals both ends of the sampler 2. At this time, the second control rope 408 is in a tension state, and the second control rope 408 rises along with the rope 1, so that the sampler 2 can be taken out of the well 7 while ensuring the sealing of the sampler 2.

[0030] Embodiment 2, as Figures 12 to 15 shown, based on Embodiment 1, a tripod 5 is connected to the rope 1. A wire releasing mechanism is installed in the tripod 5. The wire releasing mechanism controls the synchronous movement of the rope 1, the first control rope 304 and the second control rope 408, and controls the tension state of the first control rope 304 and the second control rope 408. Since the first control rope 304 needs to be always in a tension state, the descending amplitude of the first control rope 304 needs to be consistent with that of the rope 1. When the descending 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 relaxed, so that the first control rope 304 cannot be in a tension state. When the descending amplitude of the first control rope 304 is less than that of the first rope 1, the first rope 1 cannot descend effectively under the pulling force of the first control rope 304. And the descending 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 stretch the soft film 403 in advance.

[0031] Furthermore, the line-releasing mechanism includes two first driving wheels 501 rotatably mounted inside the tripod 5, the rope 1 is located between the two first driving wheels 501, and gears 502 meshing with each other are fixedly mounted on the two first driving wheels 501. When one of the first driving wheels 501 rotates, the other first driving wheel 501 will rotate synchronously in the opposite direction, so that the rope 1 can be raised or lowered. A first friction plate 503 is fixedly mounted on one of the gears 502, and a first screw rod 504 is internally threadedly connected to the tripod 5. A second friction plate 505 is rotatably mounted on the first screw rod 504, and the second friction plate 505 is slidably connected to the tripod 5. By rotating the first screw rod 504, the second friction plate 505 can be driven to move, 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 first driving wheel 501 cannot be rotated under the action of the friction force between the first friction plate 503 and the second friction plate 505, thereby making the rope 1 unable to move.

[0032] A transmission shaft 506 is fixedly mounted on one of the first driving wheels 501, a second driving wheel 507 is fixedly mounted on the transmission shaft 506, a second screw rod 508 is threadedly connected to the tripod 5, a first wheel seat 509 slidably connected to the tripod 5 is rotatably mounted on the second screw rod 508, and a third driving wheel 510 cooperating with the second driving 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. The distance between the third drive wheel 510 and the second drive wheel 507 can be adjusted by rotating the second screw rod 508. When the third drive wheel 510 and the second drive wheel 507 compress the first control rope 304, the first control rope 304 can move with the rotation of the third drive wheel 510 and the second drive wheel 507. The second drive wheel 507 can be rotated synchronously with the first drive wheel 501 through the transmission shaft 506, so that the first control rope 304 can be raised and lowered with the lifting and lowering of the rope 1. When it is necessary to cancel the tension of the first control rope 304, it is only necessary to rotate the second screw rod 508 to separate the third drive wheel 510 from the second drive wheel 507, so that the first control rope 304 can move freely up and down.

[0033] Further, a fourth driving wheel 511 is fixedly installed on the transmission shaft 506. A third lead screw 512 is threadedly connected to the tripod 5. A second wheel seat 513 slidably connected to the tripod 5 is rotatably installed on the third lead screw 512. A fifth driving wheel 514 cooperating with the fourth driving wheel 511 is rotatably installed on the second wheel seat 513. The second control rope 408 is located between the fourth driving wheel 511 and the fifth driving wheel 514. From the above, it can be seen that the second control rope 408 can be lifted and lowered along with the rope 1 by controlling the third lead screw 512, or the second control rope 408 can be freely moved.

[0034] As Figures 1 to 2 shown, in this embodiment, two sets of pressing members 6 at different heights are fixedly installed on the tripod 5. The pressing member 6 includes a first pressing block 601 fixedly installed on the tripod 5. A slide rod 603 is fixedly installed on the first pressing block 601 and a fourth lead screw 604 is rotatably installed. A second pressing block 602 threadedly connected to the fourth lead screw 604 is slidably installed on the slide rod 603. Through holes for the rope 1, the first control rope 304 and the second control rope 408 to pass through are provided on the contact surface between the first pressing block 601 and the second pressing block 602. The diameters of the through holes are respectively smaller than the diameters of the rope 1, the first control rope 304 and the second control rope 408. When a sampler 2 enters the water body 8, it is necessary to install the next sampler 2 on the rope 1. At this time, when installing the sampler 2, the rope 1 will be shaken, and then the rope 1 will drive the sampler 2 inside the water body 8 to shake, and then the water body will be disturbed. If the sampler 2 is installed in advance, the tension state of the first control rope 304 cannot be guaranteed.

[0035] After a sampler 2 enters the water body 8, when installing the subsequent sampler 2, it is necessary to first rotate the fourth lead screw 604 located below to clamp the rope 1, the first control rope 304 and the second control rope 408 between the first pressing block 601 and the second pressing block 602. At this time, the rope 1, the first control rope 304 and the second control rope 408 above continue to move down. At this time, the rope 1 between the two pressing members 6 will remain in a slack state, while the rope 1 located below the lower pressing member 6 will be tensioned by the lower pressing member 6. At this time, the sampler 2 can be installed between the two pressing members 6 or above the upper pressing member 6. At this time, the rope inside the well 7 will not be disturbed. Since notches are provided on the first pressing block 601 and the second pressing block 602, the connecting buckle 102 can pass through the notches, and then the sampler 2 can pass through the pressing member 6. At this time, the rope 1 above the lower pressing member 6 can be kept in tension, and the lower pressing member 6 can cancel the pressing on the rope 1, and then the installed sampler 2 can be lowered.

[0036] The above specific embodiments are only several alternative embodiments of the present invention. Based on the technical solution of the present invention and the relevant revelations 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, Comprising: A rope (1) and a plurality of samplers (2) detachably mounted on the rope (1), and a circulation hole (204) allowing water to pass through and penetrate the sampler (2) is left inside the sampler (2); The sampler (2) is composed of a plurality of connecting plates (201) arranged in a circular array, and a side sealing plate (203) is slidably mounted between two adjacent connecting plates (201). Elastic rings (205) with elasticity are fixedly mounted at both the upper and lower ends of the sampler (2); A contraction structure (3), the contraction structure (3) includes a first pull rope (302) and a first control rope (304) knot-connected to the first pull rope (302). The first pull rope (302) is sleeved on the sampler (2) in a circular ring shape to limit the diameter of the sampler (2), and the tension state of the first control rope (304) controls the diameter of the circular ring formed by the first pull rope (302); A sealing structure (4) installed inside the upper and lower ends of the sampler (2), the sealing structure (4) includes a flexible circular soft film (403), a second pull rope (406) in a circular ring shape is sleeved on the soft film (403), and a second control rope (408) is knot-connected to the second pull rope (406), and the second control rope (408) controls the soft film (403) to close; 2. The sampling device for detecting groundwater pollutants according to claim 1, characterized in that, The contraction structure further includes a connection head (306) fixedly mounted on the connecting plate (201). A first through hole (301) is provided on the first connection head (306). The first pull rope (302) forms a circle through a plurality of first through holes (301). A limiting head (303) with a diameter larger than the first through hole (301) is fixedly mounted at one end of the first pull rope (320). A knot (305) is provided at the other end of the first pull rope (302), and the knot (305) is fixedly connected to the first control rope (304); 3. The sampling device for detecting groundwater pollutants according to claim 2, characterized in 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 tightened; 4. The sampling device for detecting groundwater pollutants according to claim 3, characterized in that, The sealing structure (4) includes an elastic connection ring (401) fixedly mounted on the elastic ring (205). An installation groove (402) is provided at the top of the connection ring (401). The bottom of the soft film (403) is fixedly connected to the top of the installation groove (402). A plurality of second connection heads (404) are fixedly mounted around the soft film (403). A second through hole (405) is provided on the second connection head (404), and the second pull rope (406) passes through a plurality of the second through holes (405); 5. The sampling device for detecting groundwater pollutants according to claim 4, characterized in that, A circular sleeve (407) is provided at the bottom end of the second pull rope (406). 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). A plurality of air bags (409) are fixedly mounted on the inner wall of the soft film (403), and the plurality of air bags (409) are arranged in a cylindrical array and the heights decrease in sequence.

6. The sampling device for detecting groundwater pollutants according to claim 5, wherein, A groove (206) is provided at the bottom of the elastic ring (205). Both ends of the side sealing plate (203) are located inside the groove (206). A notch (202) is provided on the connecting plate. The side sealing plate (203) is slidably installed inside the notch (202).

7. The sampling device for detecting groundwater pollutants according to claim 6, characterized in that, A counterweight ball (101) is fixedly installed at the bottom of the rope (1). 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). A balance ball (103) is detachably installed on the rope (1) and on one side of the sampler (2).

8. A sampling device for detecting groundwater pollutants according to claim 7, characterized in that, A tripod (5) is connected to the rope (1). A wire releasing mechanism is installed inside the tripod (5). The wire releasing mechanism controls the synchronous movement of the rope (1) with the first control rope (304) and the second control rope (408), and controls the tension states of the first control rope (304) and the second control rope (408).

9. The sampling device for detecting groundwater pollutants according to claim 8, characterized in that, The wire releasing mechanism includes two first driving wheels (501) rotatably installed inside the tripod (5). Meshing gears (502) are fixedly installed on both of the first driving wheels (501). A first friction plate (503) is fixedly installed on one of the gears (502). A first lead screw (504) is threadedly connected inside the tripod (5). A second friction plate (505) is rotatably installed on the first lead screw (504). A transmission shaft (506) is fixedly installed on one of the first driving wheels (501). A second driving wheel (507) is fixedly installed on the transmission shaft (506). A second lead screw (508) is threadedly connected to the tripod (5). A first wheel seat (509) slidably connected to the tripod (5) is rotatably installed on the second lead screw (508). A third driving wheel (510) cooperating with the second driving wheel (507) is rotatably installed on the first wheel seat (509); A fourth driving wheel (511) is fixedly installed on the transmission shaft (506). A third lead screw (512) is threadedly connected to the tripod (5). A second wheel seat (513) slidably connected to the tripod (5) is rotatably installed on the third lead screw (512). A fifth driving wheel (514) cooperating with the fourth driving wheel (511) is rotatably installed on the second wheel seat (513); The rope (1) is located between the two first driving wheels (501). The first control rope (304) is located between the second driving wheel (507) and the third driving wheel (510). The second control rope (408) is located between the fourth driving wheel (511) and the fifth driving wheel (514).

10. The sampling device for detecting groundwater pollutants according to claim 9, characterized in that, Two sets of pressing members (6) at different heights are fixedly installed on the tripod (5). The pressing member (6) includes a first pressing block (601) fixedly installed on the tripod (5). A sliding rod (603) is fixedly installed on the first pressing block (601), and a fourth lead screw (604) is rotatably installed. A second pressing block (602) threadedly connected to the fourth lead screw (604) is slidably installed on the sliding rod (603). Through holes for the rope (1), the first control rope (304), and the second control rope (408) to pass through are provided on the contact surface between the first pressing block (601) and the second pressing block (602). The aperture diameters of the through holes are respectively smaller than the diameters of the rope (1), the first control rope (304), and the second control rope (408).

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