A layered sampling device for groundwater testing

Abstract

This invention relates to the field of water collection equipment technology, specifically disclosing a stratified sampling device for groundwater detection to prevent cross-contamination. The device includes a handheld pole and a sampling mechanism fixedly mounted on the handheld pole. The sampling mechanism includes two storage components, which are vertically adjacent and fixedly connected. Each storage component includes a storage tube, with the handheld pole fixedly connected to the outer surface of the storage tube. A connecting tube is fixedly connected to the bottom of the storage tube. This invention allows for the collection of different groundwater types using only a single device, and the entire collection process only requires continuous rotation of the rotating frame, significantly improving the efficiency of groundwater collection. It also automatically encapsulates different groundwater types, reducing the amount of equipment needed for collection. Furthermore, the device has a simple structure, is easy to carry, and is suitable for continuous use in various scenarios, greatly improving its overall applicability.

Description

Technical Field

[0001] This invention relates to the field of water collection equipment technology, specifically a stratified sampling device for groundwater testing to prevent cross-contamination. Background Technology

[0002] Groundwater is an important source of drinking water and industrial and agricultural water use, and its water quality monitoring is the foundation for environmental assessment, pollution source tracing, and water resource management. In actual monitoring tasks, it is often necessary to sample and analyze groundwater at multiple different locations, such as monitoring wells at different locations in the same watershed, monitoring wells around different pollution sources, or groundwater background points across regions.

[0003] Existing multi-site groundwater sampling equipment still has the following shortcomings in practical applications: First, traditional multi-site sampling often requires carrying multiple independent samplers or a large number of sample bottles, making the equipment bulky and inconvenient for field operations. Each time a sampling point is changed, operators need to manually open a new storage container and lower the sampling device again, a process that is time-consuming, especially when collecting samples from a large number of points, resulting in extremely high workload. Second, after completing water sampling at one location, existing equipment typically requires lifting the sampler out of the water, manually transferring the sample to a sealed bottle, and then lowering it again to collect samples from the next location. During this process, water from the previous location can easily remain on the inner wall of the sampler, the pipes, and the seals. Even rinsing with clean water is insufficient to completely remove trace contaminants, leading to cross-contamination and affecting the accuracy of subsequent water sample testing. Third, many devices lack automated sequential packaging and isolation mechanisms when collecting water samples from different locations. Operators must rely on experience to determine if the storage unit is full and manually close valves or covers, which can easily lead to operational errors causing water sample mixing or leakage. Meanwhile, water sample extraction often requires inverting or disassembling the equipment, which is not only inconvenient but also easily exposes the water sample to the air, introducing secondary pollution. Fourth, the existing equipment has a relatively complex structure; seals, valves, and other components are easily affected by mud or scale and may fail. Furthermore, the storage units at different sampling points cannot be independently controlled to open and close, making it impossible to achieve a clean operation process of sampling and sealing at each point. In summary, how to design a portable stratified sampling device that can carry multiple independent storage units at a time, automatically and sequentially complete sampling and sealing at different locations, effectively prevent cross-contamination of residual water, and facilitate water sample transfer is a pressing technical problem that needs to be solved in the field of groundwater environmental monitoring. Summary of the Invention

[0004] (a) Technical problems to be solved This invention provides a stratified sampling device for groundwater testing that prevents cross-contamination, solving the problems mentioned in the background section.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a stratified sampling device for groundwater testing to prevent cross-contamination, comprising a handheld rod and a sampling mechanism fixedly mounted on the handheld rod; wherein the sampling mechanism includes a storage component, two of which are vertically adjacent and fixedly connected, each storage component including a storage tube, wherein the handheld rod is fixedly connected to the outer surface of the upper storage tube, a connecting tube is fixedly connected to the bottom of the storage tube, the storage tube of the lower storage component is fixedly connected to the connecting tube of the upper storage component, a cover plate is fixedly connected to the top of the storage component, a drive rod is rotatably connected through the upper surface of the middle part of the cover plate, a rotating frame is fixedly connected to the top of the drive rod, and a base plate is rotatably connected to the bottom of the drive rod, the base plate being disposed below the storage component, wherein the edge of the base plate is fixedly connected to the outer surface of the connecting tube of the lower storage component via a connecting rod.

[0006] According to one embodiment of the present invention, a limiting tube is symmetrically fixedly connected to the lower surface of the cover plate, the limiting tube is symmetrically arranged on both sides of the drive rod, and the bottom of the limiting tube is fixedly connected to the upper surface of the base plate; an upper sealing disc is slidably connected to the outer surface of the limiting tube, and a magnetic ring is rotatably connected through the middle upper surface of the upper sealing disc, wherein the magnetic ring and the upper sealing disc are magnetically attracted at the same time, and the inner surface of the magnetic ring is threadedly connected to the outer surface of the drive rod; a lower sealing disc is provided on the lower surface of the upper sealing disc, and the lower sealing disc is frictionally slidably connected to the outer surface of the limiting tube, wherein the lower sealing disc is also sleeved on the outer surface of the drive rod, and the drive rod is configured as a threaded rod.

[0007] According to one embodiment of the present invention, the storage tube is configured as a double-layer tube, with auxiliary grooves symmetrically opened through the top outer surface of the storage tube, and a closed tube slidably disposed on the inner surface of the storage tube; the interior of the connecting tube is configured as hollow, wherein the top of the connecting tube is configured as an opening, a magnetic tube is slidably connected inside the connecting tube, and the bottom of the closed tube is fixedly connected to the top of the magnetic tube.

[0008] According to one embodiment of the present invention, a mounting plate is fixedly sleeved on the top outer surface of the limiting tube, and two airbags are symmetrically fixedly connected to the lower surfaces of the mounting plate. The airbags are configured as elastic corrugated airbags, wherein the airbags are sleeved on the outside of the limiting tube, and a compression ring is fixedly connected to the bottom of the airbags. The compression rings are slidably connected to the outer surface of the limiting tube, and the internal cavity of the airbags communicates with the internal cavity of the limiting tube.

[0009] According to one embodiment of the present invention, a first gas-gathering groove is formed inside the base plate, which is connected to the internal cavity of the limiting tube. A hose interface is fixedly provided through the upper surface of the base plate. A second gas-gathering groove is formed inside the lower sealing disc, which is connected to the first gas-gathering groove via a hose. An elastic telescopic rod is symmetrically fixedly connected inside the second gas-gathering groove. The internal cavity of the elastic telescopic rod is connected to the second gas-gathering groove. A clamping block is fixedly connected to the output end of the elastic telescopic rod, and the inner surface of the clamping block is threaded.

[0010] According to one embodiment of the present invention, a positioning ring is fixedly connected to the bottom outer surface of the limiting tube, a second airbag is fixedly connected to the lower surface of the positioning ring, the second airbag is also configured as an elastic corrugated airbag, a sliding ring is fixedly connected to the bottom of the second airbag, the sliding ring is slidably sleeved on the outer surface of the limiting tube, a connecting rod is fixedly connected to the upper surface of the sliding ring, a second compression ring is fixedly connected to the top of the connecting rod, the second compression ring is also slidably sleeved on the outer surface of the limiting tube, wherein the second compression ring is positioned above the positioning ring.

[0011] According to one embodiment of the present invention, a mounting cover is symmetrically fixedly connected to the outer surface of the connecting tube above, and a locking block is elastically slidably connected inside the mounting cover, the outer end of the locking block being tapered.

[0012] According to one embodiment of the present invention, compression bladders are fixedly connected to the inner surfaces of both sides of the mounting cover, the internal cavity of the compression bladder is connected to the internal cavity of the second air bladder through a hose, and a compression block is fixedly connected to the outer surface of the compression bladder.

[0013] To use this device, first move it to the designated water sampling location using the hand lever. Then, submerge the entire device in water and rotate the rotating frame to start the drive rod. The drive rod, through its threaded mechanism, moves the upper sealing plate upwards along the limiting tube. Finally, the upper sealing plate moves to the upper connecting pipe. At this point, the magnetic tube inside the upper connecting pipe attracts the upper sealing plate due to its magnetic properties. As the upper sealing plate continues to move upwards, the magnetic tube moves upwards within the connecting pipe, pushing the sealing tube upwards. Finally, the sealing tube closes the auxiliary slot at the top of the storage tube. Simultaneously, the bottom of the upper storage tube is sealed by the upper sealing plate, completing the single water resource collection. After collection, the device can be lifted and moved to the next groundwater sampling location. The equipment is submerged in water and the rotating frame rotates again in the same direction. At this point, the upper storage tube has completed its storage. Simultaneously, as the upper sealing plate moves upward during data collection, it gradually contacts and compresses the first compression ring. This compression creates high pressure inside the first airbag, which is then transmitted to the limiting tube and finally to the first gas-gathering groove in the base plate. The first gas-gathering groove connects to the second gas-gathering groove on the lower sealing plate. This compression causes the pressure inside the second gas-gathering groove to increase, pushing the elastic telescopic rod to expand. This, in turn, pushes the end clamping block closer to the drive rod. The drive rod continues to rotate, and the upper sealing plate, having reached its limit, can no longer move upward. The drive rod then begins to drive the magnetic ring. Overcoming the magnetic force, the upper sealing disc rotates, and the clamping block eventually clamps and covers the outer surface of the drive rod. The clamping block and drive rod are connected by threads. As the drive rod continues to rotate, the lower sealing disc begins to move upwards along the limiting tube under the action of the threads. Finally, the lower sealing disc moves to the lower connecting tube, sealing the bottom and simultaneously driving the lower sealing tube to seal the auxiliary groove of the lower storage tube, completing the rapid collection and sealing of different groundwater samples. As the lower sealing disc moves upwards, it gradually loses the compressive force on the second compression ring. At this time, under the elastic force of the second airbag, the second compression ring begins to move upwards synchronously along the limiting tube. The second airbag gradually resets, injecting its internal air pressure into the compression bladder in the mounting cover, increasing the pressure in the compression bladder and pushing the compression block towards the clamping block side. The inclined surface of the block pushes the locking block inward, eventually causing it to protrude from the connecting pipe and be positioned below the upper sealing plate. Simultaneously, when water needs to be removed, the device can be placed horizontally using the hand lever. Then, the drive rod is rotated in the opposite direction. At this point, the upper sealing plate cannot move downward due to the block's obstruction. The drive rod, along with the magnetic ring, continues to rotate relative to the upper sealing plate, causing the lower sealing plate to move downward, thus moving the lower magnetic tube downward and opening the auxiliary slot of the lower storage tube, completing the removal of water from the lower storage tube. When the lower sealing plate reaches the bottom, it begins to compress the second compression ring again, which in turn compresses the sliding ring, causing it to move downward along the limit rod and pull the second airbag to inflate. This causes the second airbag to return to a negative pressure state, drawing air pressure from the compression bladder, i.e., the compression bladder contracts.The clamping block resets under the action of elasticity, losing its obstruction to the upper sealing plate. With continued reversal, the auxiliary groove on the upper storage tube opens, allowing different types of groundwater to drain again. As the upper sealing plate moves downward, it loses its compression on the first airbag, causing the clamping block to reset and move away from the drive rod. The lower sealing plate, under the action of friction, fits onto the bottom of the limiting tube, maintaining tension on the second airbag and ensuring the clamping block is housed in the mounting cover. Finally, the upper sealing plate moves to the bottom, completing initialization. For subsequent use, simply rotate the drive rod again to operate.

[0014] (III) Beneficial Effects This invention provides a stratified sampling device for groundwater testing that prevents cross-contamination. It has the following beneficial effects: (i) This stratified sampling device for groundwater detection to prevent cross-contamination can collect different groundwater types using only a single device. The entire collection process only requires continuous rotation of the rotating frame, which greatly improves the efficiency of groundwater collection. At the same time, it automatically completes the encapsulation of different groundwater types, which also reduces the amount of equipment that needs to be carried during collection. In addition, the device has a simple structure, is easy to carry, and is suitable for continuous use in different scenarios, which greatly improves the overall applicability of the device.

[0015] (II) The stratified sampling equipment for groundwater testing to prevent cross-contamination has an auxiliary tank that not only facilitates the rapid filling of the storage tube with water during initial water intake to avoid air contamination, but also provides an outlet for water discharge. This avoids the problem of water spillage and difficulty in collection caused by traditional equipment that only drains water from the bottom. This equipment achieves fully automated operation from water intake to drainage, which greatly improves the ease of use of the equipment. It also automatically completes the sealing of different groundwater types. At the same time, it has a simple structure, low cost, wide applicability, and does not require repeated debugging, thus solving the problem of difficult water intake and sealing of different groundwater types. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the storage tube structure of the present invention; Figure 3 This is a schematic diagram of the structure of the drive rod of the present invention; Figure 4 This is a schematic diagram of the structure of the closed tube of the present invention; Figure 5 This is a schematic diagram of the structure of the No. 1 airbag of the present invention; Figure 6 This is a schematic diagram of the structure of the base plate of the present invention; Figure 7 This is a schematic diagram of the structure of the lower sealing disc of the present invention; Figure 8 This is a schematic diagram of the internal structure of the mounting cover of the present invention.

[0017] In the diagram: 1. Handheld rod; 2. Sampling mechanism; 21. Storage component; 22. Storage tube; 23. Connecting tube; 24. Cover plate; 25. Drive rod; 26. Rotating frame; 27. Base plate; 28. Limiting tube; 29. ​​Upper sealing plate; 210. Magnetic ring; 211. Lower sealing plate; 212. Auxiliary groove; 213. Sealing tube; 214. Magnetic tube; 215. Mounting plate; 216. No. 1 airbag; 217. No. 1 compression ring; 218. No. 1 gas gathering groove; 219. No. 2 gas gathering groove; 220. Elastic telescopic rod; 221. Clamping block; 222. Positioning ring; 223. No. 2 airbag; 224. Sliding ring; 225. Connecting rod; 226. No. 2 compression ring; 227. Mounting cover; 228. Locking block; 229. Compression bladder; 230. Compression block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] First embodiment: as follows Figures 1 to 8 As shown, the present invention provides a technical solution: a stratified sampling device for groundwater testing to prevent cross-contamination, including a handheld rod 1, and further comprising: Sampling mechanism 2 is fixedly installed on hand handle 1; The sampling mechanism 2 includes a storage component 21. There are two storage components 21, which are vertically adjacent and fixedly connected. Each storage component 21 includes a storage tube 22. A handheld rod 1 is fixedly connected to the outer surface of the upper storage tube 22. A connecting tube 23 is fixedly connected to the bottom of the storage tube 22. The storage tube 22 of the lower storage component 21 is fixedly connected to the connecting tube 23 of the upper storage component 21. A cover plate 24 is fixedly connected to the top of the storage component 21. A drive rod 25 is rotatably connected through the upper surface of the middle part of the cover plate 24. A rotating frame 26 is fixedly connected to the top of the drive rod 25. A base plate 27 is rotatably connected to the bottom of the drive rod 25. The base plate 27 is located below the storage component 21. The edge of the base plate 27 is fixedly connected to the outer surface of the connecting tube 23 of the lower storage component 21 by a connecting rod.

[0020] Limiting tubes 28 are symmetrically fixedly connected to the lower surface of the cover plate 24. The limiting tubes 28 are symmetrically arranged on both sides of the drive rod 25, and the bottom of the limiting tubes 28 is fixedly connected to the upper surface of the base plate 27. An upper sealing disc 29 is slidably connected to the outer surface of the limiting tube 28. A magnetic ring 210 is rotatably connected through the middle upper surface of the upper sealing disc 29. The magnetic ring 210 and the upper sealing disc 29 are magnetically attracted to each other. The inner surface of the magnetic ring 210 is threadedly connected to the outer surface of the drive rod 25. A lower sealing disc 211 is provided on the lower surface of the upper sealing disc 29. The lower sealing disc 211 is frictionally slidably connected to the outer surface of the limiting tube 28. The lower sealing disc 211 is also sleeved on the outer surface of the drive rod 25. The drive rod 25 is a threaded rod.

[0021] The storage tube 22 is configured as a double-layer tube. An auxiliary groove 212 is symmetrically opened through the top outer surface of the storage tube 22, and a closed tube 213 is slidably arranged on the inner surface of the storage tube 22. The interior of the connecting tube 23 is hollow, with the top of the connecting tube 23 being open. A magnetic tube 214 is slidably connected inside the connecting tube 23, and the bottom of the closed tube 213 is fixedly connected to the top of the magnetic tube 214.

[0022] A mounting plate 215 is fixedly sleeved on the top outer surface of the limiting tube 28. A first airbag 216 is symmetrically fixedly connected to the lower surfaces on both sides of the mounting plate 215. The first airbag 216 is configured as an elastic corrugated airbag. The first airbag 216 is sleeved on the outside of the limiting tube 28. A first compression ring 217 is fixedly connected to the bottom of the first airbag 216. The first compression ring 217 is slidably connected to the outer surface of the limiting tube 28. The internal cavity of the first airbag 216 is connected to the internal cavity of the limiting tube 28.

[0023] The base plate 27 has a first gas-gathering groove 218 inside, which is connected to the internal cavity of the limiting tube 28. A hose interface is fixedly provided through the upper surface of the base plate 27. The lower sealing plate 211 has a second gas-gathering groove 219 inside, which is connected to the first gas-gathering groove 218 through a hose. An elastic telescopic rod 220 is symmetrically fixedly connected inside the second gas-gathering groove 219. The internal cavity of the elastic telescopic rod 220 is connected to the second gas-gathering groove 219. A clamping block 221 is fixedly connected to the output end of the elastic telescopic rod 220. The inner surface of the clamping block 221 is threaded.

[0024] A positioning ring 222 is fixedly connected to the bottom outer surface of the limiting tube 28. A second airbag 223 is fixedly connected to the lower surface of the positioning ring 222. The second airbag 223 is also configured as an elastic corrugated airbag. A sliding ring 224 is fixedly connected to the bottom of the second airbag 223. The sliding ring 224 is slidably sleeved on the outer surface of the limiting tube 28. A connecting rod 225 is fixedly connected to the upper surface of the sliding ring 224. A second compression ring 226 is fixedly connected to the top of the connecting rod 225. The second compression ring 226 is slidably sleeved on the outer surface of the limiting tube 28. The second compression ring 226 is positioned above the positioning ring 222.

[0025] The outer surface of the upper connecting pipe 23 is symmetrically and fixedly connected with a mounting cover 227. The inside of the mounting cover 227 is elastically and slidably connected with a locking block 228, and the outer end of the locking block 228 is set as a cone.

[0026] Compression bladders 229 are fixedly connected to the inner surfaces of both sides of the mounting cover 227. The internal cavity of the compression bladder 229 is connected to the internal cavity of the second airbag 223 through a hose. Compression blocks 230 are fixedly connected to the outer surface of the compression bladder 229.

[0027] During operation, if this device is needed, it can be moved to the designated water sampling location using the hand lever 1. Then, the entire device is submerged in water. Next, the rotating frame 26 is rotated, causing the drive rod 25 to start rotating. The drive rod 25, through its threaded action, moves the upper sealing disc 29 upwards along the limiting tube 28. Finally, the upper sealing disc 29 moves to the upper connecting tube 23. At this point, the magnetic tube 214 inside the upper connecting tube 23 attracts the upper sealing disc 29 under magnetic attraction. As the upper sealing disc 29 continues to move upwards, the magnetic tube 214 begins to move upwards within the connecting tube 23, pushing the sealing tube 213 upwards. Finally, the sealing tube 213 closes the auxiliary groove 212 at the top of the storage tube 22. At this point, the bottom of the upper storage tube 22... The sealing is completed by the upper sealing plate 29, thus completing the collection of a single water resource. After collection, the device can be lifted and moved to the next groundwater location to be collected. The device is then submerged in water again, and the rotating frame 26 is rotated in the same direction. At this time, the upper storage tube 22 has completed storage. Simultaneously, as the upper sealing plate 29 moves upward during collection, it gradually contacts and squeezes the first compression ring 217. Ultimately, the squeezing of the first compression ring 217 creates a high-pressure state in the internal cavity of the first airbag 216, and the air pressure is delivered to the limiting tube 28, and finally to the first gas gathering groove 218 in the bottom plate 27. The first gas gathering groove 218 is connected to the second gas gathering groove 219 of the lower sealing plate 211, thus finally squeezing all the groundwater. For example, the second gas-gathering groove 219 increases the internal air pressure, thereby pushing the elastic telescopic rod 220 to expand. This, in turn, pushes the end clamping block 221 closer to the drive rod 25. At this time, the drive rod 25 is in a continuous rotation state. Simultaneously, when the upper sealing plate 29 reaches its limit, it can no longer move upward. Thus, the drive rod 25 begins to drive the magnetic ring 210 to overcome the magnetic force and rotate relative to the upper sealing plate 29. Finally, the clamping block 221 clamps and covers the outer surface of the drive rod 25. The clamping block 221 is threadedly connected to the drive rod 25. As the drive rod 25 continues to rotate, the lower sealing plate 211 begins to move upward along the limiting tube 28 under the action of the thread. Finally, the lower sealing plate 211 moves to the lower connecting tube 23 and seals the bottom. Simultaneously, the lower sealing pipe 213 closes the auxiliary groove 212 of the lower storage pipe 22, completing the rapid collection and packaging of different groundwater. This device completes the collection of different groundwater using only a single device, and the entire collection process only requires continuous rotation of the rotating frame 26, greatly improving the efficiency of groundwater collection. It also automatically completes the packaging of different groundwater, reducing the amount of equipment needed during collection. Furthermore, the device has a simple structure, is easy to carry, and is suitable for continuous use in different scenarios, greatly improving the overall applicability of the device. As the lower sealing plate 211 moves upward, it gradually loses the squeezing force on the second squeezing ring 226. At this time, under the elastic force of the second airbag 223, the second squeezing ring 226 begins to move upward synchronously along the limiting pipe 28.That is, the second airbag 223 gradually resets and injects its internal air pressure into the compression bladder 229 in the mounting cover 227, causing the pressure of the compression bladder 229 to increase, thereby pushing the compression block 230 to move towards the locking block 228. Through the inclined surface of the locking block 228, the locking block 228 is pushed to move inward, and finally the locking block 228 protrudes from the connecting pipe 23 and is located below the upper sealing plate 29. At the same time, when water resources need to be removed, the device can be placed horizontally by holding the handle 1, and then the drive rod 25 is rotated in the opposite direction. At this time, the upper sealing plate 29 cannot move down due to the obstruction of the locking block 228, that is, the drive rod 25 The magnetic ring 210 and the upper sealing disc 29 continue to rotate in reverse, causing the lower sealing disc 211 to move downwards, which in turn moves the lower magnetic tube 214 downwards, opening the auxiliary groove 212 of the lower storage tube 22. This completes the extraction of water from the lower storage tube 22. The auxiliary groove 212 not only facilitates the rapid filling of the storage tube 22 with water during initial water extraction to avoid air accumulation, but also provides an outlet for water discharge, avoiding the problem of water spillage and difficulty in collection caused by traditional equipment that only drains from the bottom. When the lower sealing disc 211 moves to the bottom, it begins to re-expose the second compression ring 22. 6. Squeezing is applied, and then the sliding ring 224 is re-squeezed down along the limit rod, pulling the second airbag 223 to expand. This causes the second airbag 223 to return to a negative pressure state, drawing air pressure from the squeezing bladder 229, i.e., the squeezing bladder 229 contracts. The clamping block 228 resets under the action of elasticity, losing its obstruction to the upper sealing plate 29. As the reverse rotation continues, the auxiliary groove 212 on the upper storage tube 22 is opened, completing the discharge of different groundwater again. As the upper sealing plate 29 moves down, it loses its squeezing of the first airbag 216, and the clamping block 221 begins to reset and move away from the drive rod. 25. Under the action of friction, the lower sealing disc 211 is fitted onto the bottom of the limiting tube 28, maintaining the tension on the second airbag 223, ensuring that the locking block 228 is housed in the mounting cover 227. Finally, the upper sealing disc 29 moves down to the bottom to complete initialization. For subsequent use, simply rotate the drive rod 25 again to operate. This equipment achieves fully automated operation from water intake to drainage, significantly improving its ease of use. It automatically seals different types of groundwater, and its simple structure, low cost, and wide applicability eliminate the need for repeated debugging, solving the problem of difficult water intake and sealing of different types of groundwater.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stratified sampling device for groundwater testing to prevent cross-contamination, comprising a handheld pole, characterized in that: Also includes: The sampling mechanism is fixedly mounted on the handheld handle; The sampling mechanism includes a storage component, and two storage components are provided, which are vertically adjacent and fixedly connected. Each storage component includes a storage tube, with a handheld rod fixedly connected to the outer surface of the upper storage tube. A connecting tube is fixedly connected to the bottom of the storage tube, and the storage tube of the lower storage component is fixedly connected to the connecting tube of the upper storage component. A cover plate is fixedly connected to the top of the storage component, and a drive rod is rotatably connected through the upper surface of the middle part of the cover plate. A rotating frame is fixedly connected to the top of the drive rod, and a base plate is rotatably connected to the bottom of the drive rod. The base plate is located below the storage component, and the edge of the base plate is fixedly connected to the outer surface of the connecting tube of the lower storage component by a connecting rod.

2. The stratified sampling device for groundwater testing to prevent cross-contamination as described in claim 1, characterized in that: The lower surface of the cover plate is symmetrically fixedly connected with limiting tubes, which are symmetrically arranged on both sides of the drive rod, and the bottom of the limiting tubes is fixedly connected to the upper surface of the base plate. An upper sealing disc is slidably connected to the outer surface of the limiting tube. A magnetic ring is rotatably connected through the middle upper surface of the upper sealing disc. The magnetic ring and the upper sealing disc are magnetically attracted to each other. The inner surface of the magnetic ring is threadedly connected to the outer surface of the drive rod. A lower sealing disc is provided on the lower surface of the upper sealing disc. The lower sealing disc is frictionally slidably connected to the outer surface of the limiting tube. The lower sealing disc is also sleeved on the outer surface of the drive rod. The drive rod is configured as a threaded rod.

3. The stratified sampling device for groundwater testing to prevent cross-contamination as described in claim 2, characterized in that: The storage tube is configured as a double-layer tube, with auxiliary grooves symmetrically opened through the top outer surface of the storage tube, and a closed tube slidably arranged on the inner surface of the storage tube; The interior of the connecting tube is hollow, with an open top. A magnetic tube is slidably connected inside the connecting tube, and the bottom of the closed tube is fixedly connected to the top of the magnetic tube.

4. A stratified sampling device for groundwater testing to prevent cross-contamination as described in claim 3, characterized in that: A mounting plate is fixedly sleeved on the top outer surface of the limiting tube. A No. 1 airbag is symmetrically fixedly connected to the lower surfaces of both sides of the mounting plate. The No. 1 airbag is configured as an elastic corrugated airbag. The No. 1 airbag is sleeved on the outside of the limiting tube. A No. 1 compression ring is fixedly connected to the bottom of the No. 1 airbag. The No. 1 compression ring is slidably connected to the outer surface of the limiting tube. The internal cavity of the No. 1 airbag is connected to the internal cavity of the limiting tube.

5. A stratified sampling device for groundwater testing to prevent cross-contamination as described in claim 4, characterized in that: The base plate has a first air-gathering groove inside, which is connected to the internal cavity of the limiting tube. A hose interface is fixedly provided through the upper surface of the base plate. The lower sealing plate has a second air-gathering groove inside, which is connected to the first air-gathering groove via a hose. An elastic telescopic rod is symmetrically fixedly connected inside the second air-gathering groove. The internal cavity of the elastic telescopic rod is connected to the second air-gathering groove. A clamping block is fixedly connected to the output end of the elastic telescopic rod. The inner surface of the clamping block is threaded.

6. A stratified sampling device for groundwater testing to prevent cross-contamination as described in claim 5, characterized in that: A positioning ring is fixedly connected to the bottom outer surface of the limiting tube. A second airbag is fixedly connected to the lower surface of the positioning ring. The second airbag is also configured as an elastic corrugated airbag. A sliding ring is fixedly connected to the bottom of the second airbag. The sliding ring is slidably sleeved on the outer surface of the limiting tube. A connecting rod is fixedly connected to the upper surface of the sliding ring. A second compression ring is fixedly connected to the top of the connecting rod. The second compression ring is slidably sleeved on the outer surface of the limiting tube. The second compression ring is positioned above the positioning ring.

7. A stratified sampling device for groundwater testing to prevent cross-contamination as described in claim 6, characterized in that: The outer surface of the connecting pipe described above is symmetrically and fixedly connected with a mounting cover, and the inside of the mounting cover is elastically and slidably connected with a locking block, the outer end of which is tapered.

8. A stratified sampling device for groundwater testing to prevent cross-contamination as described in claim 7, characterized in that: Compression bladders are fixedly connected to the inner surfaces of both sides of the mounting cover. The internal cavity of the compression bladder is connected to the internal cavity of the second airbag through a hose. Compression blocks are fixedly connected to the outer surface of the compression bladder.

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