An oasis area groundwater heavy metal content detection device

Abstract

The application discloses an oasis regional underground water heavy metal content detection device, and relates to the underground water detection field.The device comprises a base, a through hole is formed in the center of the lower surface of the base, a supporting assembly is arranged at the lower end of the base, a water collecting box is arranged at the upper end of the base, a cover plate is connected to the water collecting box, a fixing assembly is arranged at the upper end of the cover plate, a conveying pipe is fixedly connected to the inner wall of the lower end of the through hole, and the sealing and packaging structure of the collecting assembly and the negative pressure sampling sealing channel design of the device as a whole are adopted to realize the sealing operation of the whole process of underground water sampling, detection and packaging, the sampling water is hardly in contact with air during the circulation process, the in-situ water quality state of the underground water is effectively maintained, the water sample composition change problem caused by air contact is fundamentally avoided, the accuracy of the oasis regional underground water heavy metal content detection result is greatly improved, and the actual demand of the regional underground water heavy metal accurate detection is met.

Description

Technical Field

[0001] This invention relates to groundwater detection technology, specifically to a device for detecting heavy metal content in groundwater in oasis areas. Background Technology

[0002] As a scarce and vital ecological and production unit in arid and semi-arid regions, oasis areas rely heavily on groundwater. Groundwater is the core water source for maintaining oasis vegetation growth, supporting agricultural production, and ensuring residents' livelihoods. Its water quality directly determines the stability of the oasis ecosystem and regional water security. In recent years, with the large-scale development of agriculture, the expansion of industrial activities, and the discharge of wastewater from human production and daily life in oasis areas, heavy metal pollutants have gradually seeped into groundwater through surface runoff infiltration and soil leaching. This has led to increasingly prominent problems with excessive levels of heavy metals such as lead, cadmium, mercury, and chromium in groundwater. This not only damages the groundwater ecological environment but also enters the human body and crops through drinking water and irrigation, endangering human health and the quality and safety of agricultural products.

[0003] Chinese patent CN218035855U discloses a device for detecting heavy metal content in deep groundwater, including a water collection box. A fixing plate is fixedly installed inside the water collection box, and two air suction plates are installed between the fixing plate and the water collection box through two sliding mechanisms, which solves the problem of inconvenience in detecting groundwater.

[0004] However, existing groundwater heavy metal detection devices cannot easily seal and repackage the sampled water after sampling. Furthermore, the repackaging process can easily lead to the sampled water coming into contact with air, which can damage the in-situ water quality of the groundwater and thus affect the accuracy of the heavy metal content detection results. This makes it impossible to meet the actual needs of accurate detection of heavy metals in groundwater in oasis areas and subsequent secondary detection. Summary of the Invention

[0005] The purpose of this invention is to provide a device for detecting heavy metal content in groundwater in oasis areas, which solves the problem that existing technologies make it difficult to achieve convenient and sealed packaging of sampled water, and that the packaging process easily leads to contact between the sampled water and air, which damages the in-situ water quality of the groundwater and affects the accuracy of heavy metal content detection results. This makes it impossible to meet the problems of accurate detection of heavy metals in groundwater in oasis areas and subsequent secondary detection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for detecting heavy metal content in groundwater in oasis areas, comprising a base, a through hole at the center of the lower surface of the base, a support component at the lower end of the base, a water collection box at the upper end of the base, a cover plate connected to the water collection box at the upper end of the base, a fixing component at the upper end of the cover plate, and a conveying pipe fixedly connected to the inner wall at the lower end of the through hole.

[0007] The water collection box has a first opening and a second opening on its upper and lower surfaces, respectively. A first solenoid valve is provided at the upper end of the first opening, and a first connecting pipe is provided at the upper end of the first solenoid valve. A second solenoid valve is provided at the lower end of the second opening, and a second connecting pipe is provided at the lower end of the second solenoid valve. Two drain outlets are provided at the lower end of the water collection box. A conveying component is provided on the lower surface of the water collection box, and a collection component is provided on the inner wall of the drain outlet.

[0008] The collection assembly includes a collection cylinder with threads on the outer walls at both ends. A rotating ring is fixedly connected to the outer wall in the middle of the collection cylinder. A drive column is movably connected to the inner wall of the collection cylinder. A first baffle is fixedly connected to the upper end of the drive column. A second baffle is fixedly connected to the side wall in the middle of the drive column. A connecting cylinder is movably connected to the lower end of the drive column. A drive ring is fixedly connected to the upper end of the connecting cylinder. The drive ring is threadedly connected to the outer wall at the lower end of the collection cylinder. The outer wall at the upper end of the collection cylinder is threadedly connected to the inner wall of the drain outlet.

[0009] Furthermore, a connecting pipe is fixedly connected to the inner wall of the upper end of the through hole, and the upper end of the connecting pipe abuts against the inner wall of the second connecting pipe. A third through hole is opened at the center of the upper surface of the cover plate, and a third connecting pipe is fixedly connected to the inner wall of the upper end of the third through hole. A vacuum pump is fixedly connected to one end of the third connecting pipe, and the upper end of the first connecting pipe abuts against the inner wall of the third through hole.

[0010] Furthermore, the fixing component includes a drive disk movably connected to the upper end of the cover plate, a threaded post fixedly connected to the lower end of the drive disk, the lower end of the threaded post penetrating the cover plate, the lower end of the threaded post being movably connected to the upper surface of the base, telescopic cylinders being uniformly fixedly connected to the lower end of the cover plate, telescopic posts being movably connected to the inner wall of the lower end of the telescopic cylinders, and the lower end of the telescopic posts being fixedly connected to the upper surface of the base.

[0011] Furthermore, the support assembly includes a rotating seat fixedly connected to the lower surface of the base, and a bracket is movably connected to the inner wall of the rotating seat.

[0012] Furthermore, the conveying assembly includes a rotary drive component fixedly connected to the lower surface of the base. A rotating column is fixedly connected to the output end of the rotary drive component. A winding reel is fixedly connected to the side wall of the rotating column. A traction rope is fixedly connected to the side wall of the winding reel. A fixing plate is movably connected to the end of the rotating column away from the rotary drive component. The upper end of the fixing plate is fixedly connected to the lower surface of the base.

[0013] Furthermore, an installation cylinder is fixedly connected to the outer wall of the lower end of the conveying pipe, a third solenoid valve is fixedly connected to the inner wall of the lower end of the installation cylinder, and an adjustment component is provided at the lower end of the conveying pipe.

[0014] Furthermore, the adjustment assembly includes a mounting ring fixedly connected to the outer wall of the mounting cylinder. The lower surface of the mounting ring is evenly provided with multiple threaded grooves. The inner wall of the threaded grooves is threadedly connected to a mounting post, and the lower end of the mounting post is fixedly connected to a counterweight ball.

[0015] Furthermore, a support plate is uniformly fixedly connected to the lower surface of the water collection box, and the lower end of the support plate abuts against the upper surface of the base.

[0016] Furthermore, a fixing column is fixedly connected to the outer wall of the conveying pipe, and a fixing groove is provided on the side wall of the fixing column.

[0017] Furthermore, the sidewalls of both the first and second baffles are provided with a rubber layer, and the sidewall of the base is provided with a placement groove.

[0018] Compared with existing technologies, the present invention provides a groundwater heavy metal content detection device for oasis areas. Through the sealed packaging structure of the collection components and the negative pressure sampling sealed passage design of the entire device, the entire process of groundwater sampling, detection and packaging is sealed. The sampled water hardly comes into contact with air during the flow process, effectively maintaining the in-situ water quality state of the groundwater. This fundamentally avoids the problem of water sample composition changes caused by air contact, greatly improves the accuracy of heavy metal content detection results in oasis areas, and meets the actual needs of accurate detection of heavy metals in regional groundwater.

[0019] Secondly, the collection component adopts a detachable structure with threaded engagement and a double-baffle double-layer sealing design, which enables convenient sealing and quick disassembly of the sampled water. The disassembled water sample can be stored in the sealed collection tube, providing effective water samples for subsequent secondary testing of groundwater heavy metals in the oasis area. This solves the problem that existing devices cannot meet the needs of subsequent secondary testing. At the same time, the disassembly and assembly of the collection tube is simple and adaptable to the field testing operation scenario in the oasis area, improving the practicality and flexibility of the testing operation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present invention. Figure 1 ;

[0022] Figure 2 A schematic diagram of the overall structure provided for an embodiment of the present invention. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the structure of the water collection box provided in an embodiment of the present invention;

[0024] Figure 4 A cross-sectional view of the water collection box provided in an embodiment of the present invention;

[0025] Figure 5 A cross-sectional view of the collection component provided in an embodiment of the present invention;

[0026] Figure 6 This is an exploded view of the adjustment component provided in an embodiment of the present invention;

[0027] Figure 7 This is an exploded structural diagram of the fixing component provided in an embodiment of the present invention;

[0028] Figure 8 This is an exploded structural diagram of the conveying assembly provided in an embodiment of the present invention;

[0029] Figure 9 This is an exploded structural diagram of the support component provided in an embodiment of the present invention;

[0030] Figure 10 A cross-sectional view of the base provided in an embodiment of the present invention;

[0031] Figure 11 A cross-sectional view of the delivery pipe provided in an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Base; 11. Placement slot; 12. Through hole; 13. Abutment pipe; 14. Support assembly; 141. Rotating seat; 142. Bracket; 2. Water collection box; 21. First port; 211. First solenoid valve; 212. First connecting pipe; 22. Second port; 221. Second solenoid valve; 222. Second connecting pipe; 23. Drain outlet; 24. Conveying assembly; 241. Rotary drive component; 242. Rotating column; 243. Winding reel; 244. Traction rope; 245. Fixing plate; 25. Collection assembly; 251. Collection cylinder; 252. 253. Rotating ring; 254. Drive column; 255. First baffle; 256. Second baffle; 257. Connecting cylinder; 258. Drive ring; 29. ​​Support plate; 20. Cover plate; 31. Third port; 32. Third connecting pipe; 33. Vacuum pump; 4. Fixing assembly; 41. Drive disc; 42. Threaded column; 43. Telescopic cylinder; 44. Telescopic column; 5. Conveying pipe; 51. Fixing column; 511. Fixing groove; 52. Mounting cylinder; 53. Third solenoid valve; 6. Adjusting assembly; 61. Mounting ring; 62. Threaded groove; 63. Mounting column; 64. Counterweight ball. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] To address the challenges of convenient and sealed repackaging of groundwater samples, which can easily lead to contact between the samples and air during repackaging, disrupting the in-situ water quality and affecting the accuracy of heavy metal content testing, thus failing to meet the requirements for precise heavy metal detection and subsequent secondary testing in oasis areas, please refer to [the relevant documentation / reference]. Figure 1 - Figure 11 The following preferred technical solutions are provided.

[0036] An embodiment of the present invention provides a device for detecting heavy metal content in groundwater in oasis areas, comprising a base 1, a through hole 12 at the center of the lower surface of the base 1, a support component 14 at the lower end of the base 1, a water collection box 2 at the upper end of the base 1, a cover plate 3 connected to the water collection box 2 at the upper end of the base 1, a fixing component 4 at the upper end of the cover plate 3, and a conveying pipe 5 fixedly connected to the inner wall at the lower end of the through hole 12.

[0037] The water collection box 2 has a first opening 21 and a second opening 22 on its upper and lower surfaces, respectively. A first solenoid valve 211 is provided at the upper end of the first opening 21, and a first connecting pipe 212 is provided at the upper end of the first solenoid valve 211. A second solenoid valve 221 is provided at the lower end of the second opening 22, and a second connecting pipe 222 is provided at the lower end of the second solenoid valve 221. Two drain outlets 23 are provided at the lower end of the water collection box 2. A conveying component 24 is provided on the lower surface of the water collection box 2, and a collection component 25 is provided on the inner wall of the drain outlet 23.

[0038] The collection assembly 25 includes a collection cylinder 251. The outer walls at both ends of the collection cylinder 251 are threaded. A rotating ring 252 is fixedly connected to the outer wall in the middle of the collection cylinder 251. A drive column 253 is movably connected to the inner wall of the collection cylinder 251. A first baffle 254 is fixedly connected to the upper end of the drive column 253. A second baffle 255 is fixedly connected to the side wall in the middle of the drive column 253. A connecting cylinder 256 is movably connected to the lower end of the drive column 253. A drive ring 257 is fixedly connected to the upper end of the connecting cylinder 256. The drive ring 257 is threadedly connected to the outer wall at the lower end of the collection cylinder 251. The outer wall at the upper end of the collection cylinder 251 is threadedly connected to the inner wall of the drain outlet 23. In this embodiment, a detection rod is installed in the water collection box 2. The detection rod has been disclosed by patent CN218035855U. The first solenoid valve 211, the second solenoid valve 221, and the third solenoid valve 53 are electrically connected to the controller.

[0039] Specifically, when conducting groundwater heavy metal testing at designated testing points, the base 1 is first stabilized using the support component 14 at its lower end to ensure the overall stability of the testing operation. Then, the water collection box 2 is assembled to the corresponding position on the upper end of the base 1. Next, the conveying component 24 on the lower surface of the water collection box 2 is activated, precisely lowering the installation cylinder 52 at the lower end of the conveying pipe 5 to the groundwater area to be sampled, preparing for water sample collection. Then, the controller simultaneously opens the first solenoid valve 211 at the first port 21 and the second solenoid valve 221 at the second port 22 on the water collection box 2. Utilizing the suction effect of the vacuum pump 33 on the cover plate 3, the air is drawn through the third connection... Air is drawn into the water collection box 2 through pipe 32 and the first connecting pipe 212, and simultaneously drawn into the delivery pipe 5 through the second connecting pipe 222 and the abutment pipe 13 of the base 1, creating a negative pressure state inside the water collection box 2 and the delivery pipe 5. Then, the first solenoid valve 211 and the vacuum pump 33 are closed, and the third solenoid valve 53 inside the mounting cylinder 52 is opened. Using the pressure difference between the inside and outside of the device, groundwater is drawn into the water collection box 2 through the delivery pipe 5 and the second connecting pipe 222, completing the negative pressure sampling of groundwater. After the groundwater sampling is completed in the water collection box 2, the operator activates the detection rod inside the water collection box 2 to detect the heavy metal content of the groundwater in the sealed state, accurately obtaining the groundwater content. After the heavy metal composition and content data are tested, the drive ring 257 of the collection component 25 at the drain outlet 23 of the water collection box 2 is rotated. Through the threaded engagement between the drive ring 257 and the collection cylinder 251, the drive column 253 is driven upward, causing the first baffle 254 at the upper end of the drive column 253 to release the blockage of the drain outlet 23. The water sample in the water collection box 2 then flows into the collection cylinder 251 through the drain outlet 23. The water sample is concentrated in the sealed space formed by the upper end of the second baffle 255 and the inner wall of the collection cylinder 251. Then, the drive ring 257 is rotated in the opposite direction, causing the drive column 253 to return to its original position. The first baffle 254 re-blocks the drain outlet 23, and the second baffle 255 then seals the space inside the collection cylinder 251. The water sample is sealed twice. The first baffle 254, the second baffle 255 and the collection tube 251 work together to seal and dispense the sampled water to meet the needs of subsequent secondary testing. After dispensing, the rotating ring 252 on the outside of the collection tube 251 is rotated to release the threaded connection between the collection tube 251 and the drain outlet 23, and the sealed collection tube 251 can be removed. At the same time, the remaining water sample in the water collection box 2 can be discharged smoothly through the drain outlet 23. Throughout the entire testing and dispensing process, the water sample always flows in a relatively sealed channel and space, minimizing contact with air and effectively avoiding changes in water sample composition caused by air contact, thus ensuring the accuracy of heavy metal content detection results.

[0040] A connecting pipe 13 is fixedly connected to the inner wall of the upper end of the through hole 12. The upper end of the connecting pipe 13 abuts against the inner wall of the second connecting pipe 222. A third through hole 31 is opened at the center of the upper surface of the cover plate 3. A third connecting pipe 32 is fixedly connected to the inner wall of the upper end of the third through hole 31. A vacuum pump 33 is fixedly connected to one end of the third connecting pipe 32. The upper end of the first connecting pipe 212 abuts against the inner wall of the third through hole 31.

[0041] Specifically, the connecting pipe 13 fixed to the inner wall of the upper end of the through hole 12 of the base 1 serves as a transitional structure connecting the conveying pipe 5 and the water collection box 2. Its upper end abuts against the inner wall of the second connecting pipe 222 below the second opening 22 of the water collection box 2, achieving a sealed connection between the conveying pipe 5 and the water collection box 2. This establishes a sealed flow channel for groundwater to enter the water collection box 2 from the conveying pipe 5, while also ensuring the airtightness of this connection during vacuuming, preventing air leakage from affecting the formation of negative pressure. The third opening 31 opened at the center of the upper surface of the cover plate 3 is the core opening for the vacuuming operation. One end of the third connecting pipe 32 fixed to its upper inner wall is connected to the vacuum pump 33, and the other end abuts against the inner wall of the upper end of the first connecting pipe 212 above the first opening 21 of the water collection box 2, allowing the vacuum pump 33 to... The third connecting pipe 32, the third port 31, and the first connecting pipe 212 form a sealed air extraction passage. When the vacuum pump 33 is started, air can be extracted from the inside of the water collection box 2 through this passage. At the same time, with the help of the sealed connection between the water collection box 2 and the delivery pipe 5, the air extraction force will be transmitted to the inside of the delivery pipe 5 through the second connecting pipe 222 and the abutment pipe 13, realizing the synchronous vacuuming operation of the water collection box 2 and the delivery pipe 5. This provides the necessary air pressure conditions for the subsequent extraction of groundwater using negative pressure. The precise abutment design of each connection part is to ensure the airtightness of the device inside during the vacuuming process, prevent poor negative pressure effect due to air leakage, and ensure that the groundwater sampling operation can be completed smoothly. At the same time, it can also prevent the groundwater after sampling from contacting the air, ensuring the in-situ state of the water sample.

[0042] The fixed component 4 includes a drive disk 41 movably connected to the upper end of the cover plate 3. A threaded post 42 is fixedly connected to the lower end of the drive disk 41. The lower end of the threaded post 42 passes through the cover plate 3 and is movably connected to the upper surface of the base 1. Telescopic cylinders 43 are uniformly fixedly connected to the lower end of the cover plate 3. Telescopic posts 44 are movably connected to the inner wall of the lower end of the telescopic cylinders 43. The lower end of the telescopic posts 44 is fixedly connected to the upper surface of the base 1. The cover plate 3 is threadedly connected to the side wall of the threaded post 42.

[0043] Specifically, the fixing component 4 uses threaded transmission as its core power. When installing the water collection box 2, the operator rotates the drive disc 41 at the upper end of the cover plate 3. The drive disc 41 drives the threaded post 42 at its lower end to rotate synchronously. Because the lower end of the threaded post 42 is movably connected to the upper surface of the base 1, and the cover plate 3 and the side wall of the threaded post 42 are threadedly engaged, and the telescopic cylinder 43 uniformly fixed at the lower end of the cover plate 3 and the telescopic post 44 fixed on the upper surface of the base 1 form a sliding engagement, it guides and limits the movement of the cover plate 3. Therefore, when the threaded post 42 rotates, the cover plate 3 will move smoothly downward along the axial direction of the threaded post 42. During the downward movement of the cover plate 3, it will exert a downward squeezing force on the water collection box 2 below it, so that the water collection box 2 is stably attached to the base 1. At the same time, it drives the second connecting pipe 222 on the lower side of the water collection box 2 to precisely abut against the inner wall of the abutment pipe 13 at the upper end of the through hole 12 of the base 1. Next, the first connecting pipe 212 on the upper side of the water collection box 2 precisely abuts against the inner wall of the third opening 31 of the cover plate 3. Through this squeezing and fitting method, a tight seal is formed between the connecting parts, which not only achieves the firm fixation of the water collection box 2 between the base 1 and the cover plate 3, but also ensures the airtightness of each connecting channel during vacuuming and water sampling. When the water collection box 2 needs to be disassembled for cleaning or replacement after the test is completed, simply rotate the drive disc 41 in the opposite direction to drive the threaded column 42 to rotate in the opposite direction. Under the guidance of the threaded transmission and the telescopic cylinder 43 and the telescopic column 44, the cover plate 3 will move upward along the axial direction of the threaded column 42, releasing the squeezing pressure on the water collection box 2. At this time, the abutment fit between the second connecting pipe 222 and the abutting pipe 13, and between the first connecting pipe 212 and the third opening 31 is also released. The operator can then easily remove the water collection box 2 from the base 1 to complete the disassembly operation.

[0044] The support assembly 14 includes a rotating seat 141 fixedly connected to the lower surface of the base 1, and a bracket 142 movably connected to the inner wall of the rotating seat 141.

[0045] Specifically, this component serves as the supporting foundation for the entire device. Through the movable cooperation structure between the rotating seat 141 and the bracket 142, it achieves stable support and adaptability fixation for the base 1. The rotating seat 141, which is fixedly connected to the lower surface of the base 1, provides a rotatable connecting base for the bracket 142. The bracket 142 is movably connected to the inner wall of the rotating seat 141, allowing the bracket 142 to rotate freely around the rotating seat 141 as the axis. When setting up the device before the testing operation, the operator can adjust the rotation angle of each bracket 142 according to the flatness of the ground and the terrain conditions of the testing point, so that the lower end of each bracket 142 can achieve stable and tight contact with the ground. Through the distributed support of multiple brackets 142, the base 1 is stably erected, keeping the base 1 in a horizontal state at all times, avoiding tilting or shaking of the device due to uneven ground. This ensures the stability of all subsequent operations such as vacuuming, water sampling, and heavy metal detection from the basic structural perspective.

[0046] The conveying assembly 24 includes a rotary drive 241 fixedly connected to the lower surface of the base 1. A rotating column 242 is fixedly connected to the output end of the rotary drive 241. A winding reel 243 is fixedly connected to the side wall of the rotating column 242. A traction rope 244 is fixedly connected to the side wall of the winding reel 243. A fixing plate 245 is movably connected to the end of the rotating column 242 away from the rotary drive 241. The upper end of the fixing plate 245 is fixedly connected to the lower surface of the base 1. In this embodiment, the rotary drive 241 can be a servo motor.

[0047] Specifically, this component uses a rotary drive 241 as its power source, and achieves precise lifting and lowering of the delivery pipe 5 and the lower mounting cylinder 52 through mechanical transmission, adapting to the sampling needs of groundwater at different depths. The rotary drive 241, fixed to the lower surface of the base 1, provides stable power to the entire component. Its output end is fixedly connected to the rotating column 242. The end of the rotating column 242 away from the rotary drive 241 is movably connected to the fixed plate 245. The fixed plate 245 provides radial support for the rotating column 242, effectively preventing the rotating column 242 from shifting or shaking during rotation, ensuring the stability of the transmission. The winding reel 243 fixed to the side wall of the rotating column 242 rotates synchronously with the rotating column 242. The lower end of the traction rope 244 fixed to the side wall of the winding reel 243 is connected to the mounting ring 61 on the outside of the delivery pipe 5. The components are connected to form a traction structure for power transmission. When the installation cylinder 52 needs to be lowered to the groundwater depth to be sampled, the rotary drive 241 is activated and its forward rotation is controlled, which drives the rotating column 242 and the winding reel 243 to rotate synchronously in the forward direction. The winding reel 243 slowly releases the traction rope 244. Under its own weight and with the assistance of the counterweight ball 64, the delivery pipe 5 and the installation cylinder 52 move smoothly downward in the vertical direction until they reach the preset sampling depth. After sampling and testing are completed, the rotary drive 241 is controlled to rotate in the reverse direction, which drives the rotating column 242 and the winding reel 243 to rotate synchronously in the reverse direction. The winding reel 243 gradually winds up the traction rope 244. The tension of the traction rope 244 drives the installation cylinder 52 and the delivery pipe 5 to move vertically upward until they return to their initial positions.

[0048] An installation cylinder 52 is fixedly connected to the outer wall of the lower end of the conveying pipe 5, and a third solenoid valve 53 is fixedly connected to the inner wall of the lower end of the installation cylinder 52. An adjustment component 6 is provided at the lower end of the conveying pipe 5.

[0049] Specifically, the delivery pipe 5 serves as the core flow channel for groundwater sampling. Its upper end is sealed and connected to the through hole 12 and the connecting pipe 13 of the base 1. The mounting cylinder 52, fixed to the outer wall of the lower end, provides a stable mounting carrier for the third solenoid valve 53 and also provides a structural foundation for the connection between the delivery pipe 5 and the regulating component 6. This allows the delivery pipe 5 to form a complete sealed pipeline from the underground water intake area to the water collection box 2. The third solenoid valve 53, fixed to the inner wall of the lower end of the mounting cylinder 52, provides precise on / off control for the water intake of the delivery pipe 5. It is a key control component for achieving negative pressure water intake. Before the device completes the vacuuming operation, the third solenoid valve 53 is normally closed, which can effectively prevent outside air from entering the delivery pipe 5. This ensures that when the vacuum pump 33 evacuates the water collection box 2 and the delivery pipe 5, a stable negative pressure can be formed inside the pipeline. To prevent negative pressure failure due to air leakage, when the vacuum pump 33 completes the vacuuming operation and a preset negative pressure is formed inside the water collection box 2 and the delivery pipe 5, the controller controls the third solenoid valve 53 to open. At this time, the water intake at the lower end of the delivery pipe 5 is connected to the groundwater. Under the pressure difference between the external atmospheric pressure and the negative pressure inside the pipe, the groundwater will enter the delivery pipe 5 from the water intake, and then flow into the sealed water collection box 2 at a constant speed through the abutment pipe 13 and the second connecting pipe 222, realizing automatic negative pressure sampling of groundwater. Then, the controller controls the second solenoid valve 221 to close, cutting off the water intake passage and forming a sealed pipeline again to prevent the sampled water in the water collection box 2 from contacting the air, ensuring the in-situ water quality of the water sample. Throughout the process, the delivery pipe 5 plays the core role in the delivery of the water sample, and the mounting cylinder 52 realizes the stable assembly of the components.

[0050] The adjustment assembly 6 includes a mounting ring 61 fixedly connected to the outer wall of the mounting cylinder 52. The lower surface of the mounting ring 61 is evenly provided with multiple threaded grooves 62. The inner wall of the threaded grooves 62 is threadedly connected to a mounting post 63. The lower end of the mounting post 63 is fixedly connected to a counterweight ball 64. The lower end of the traction rope 244 is fixedly connected to the upper surface of the mounting ring 61.

[0051] Specifically, this component uses a detachable counterweight structure as its core, providing adaptive gravity support for the sinking of the delivery pipe 5 and the installation cylinder 52, ensuring its smooth sinking into the groundwater area to be tested under different hydrological conditions, and adapting to the diverse sampling environment of the oasis area. The installation ring 61 fixed to the outer wall of the installation cylinder 52 is the installation foundation of the entire component. Multiple threaded grooves 62 evenly opened on its lower surface provide threaded connection points for the installation column 63. At the same time, the upper surface of the installation ring 61 is also fixed to the lower end of the traction rope 244 of the delivery component 24, realizing the power connection with the delivery component 24. The installation column 63 and the threaded grooves 62 are threadedly engaged, and the counterweight ball 64 fixed at its lower end provides core gravity for the sinking of the device. Before carrying out groundwater sampling, the operator can determine the groundwater depth, water flow velocity, water buoyancy, etc. in the area to be tested. Depending on the actual hydrological conditions, the number of mounting columns 63 and counterweight balls 64 screwed into the threaded groove 62 of the mounting ring 61 can be flexibly selected. If the water area to be tested is deep, the water flow is fast, or the buoyancy of the water body is large, the number of counterweight balls 64 can be increased to increase the overall weight and prevent the delivery pipe 5 and the mounting cylinder 52 from being offset by the water flow or from failing to sink to the preset sampling depth due to buoyancy. If the water area to be tested is shallow and the water flow is gentle, the number of counterweight balls 64 can be appropriately reduced to reduce the weight and prevent the device from sinking too fast and hitting the bottom of the water, causing damage to the pipeline and valves. The counterweight balls 64 can be detached and installed through the threaded structure, which is convenient to operate and highly adaptable. With the traction rope 244 to pull and limit the mounting ring 61, the delivery pipe 5 and the mounting cylinder 52 can sink steadily in the vertical direction to the specified sampling depth under the gravity of the counterweight balls 64.

[0052] A support plate 26 is evenly fixedly connected to the lower surface of the water collection box 2, and the lower end of the support plate 26 abuts against the upper surface of the base 1.

[0053] Specifically, the support plate 26 is evenly fixed on the lower surface of the water collection box 2, and its lower end precisely abuts against the upper surface of the base 1. As an auxiliary support structure for the water collection box 2, it bears the weight of the water collection box 2 itself and part of the load after the water sample is filled inside, forming a multi-point support system. After the device is assembled, the second connecting pipe 222 on the lower side of the water collection box 2 abuts against the abutting pipe 13 of the base 1. If the water collection box 2 is supported only by this connection part, the abutting pipe 13 will be in a single stress state, which may lead to long-term stress or damage to the water sample. When the load is large, it is easy to deform, loosen or even be damaged due to concentrated force. This will not only affect the airtightness of the connection, but may also cause the water collection box 2 to tilt and water to leak. However, after the evenly distributed support plate 26 abuts against the base 1, it will distribute the load of the water collection box 2 to multiple contact points of the base 1, greatly reduce the pressure on the abutment pipe 13, avoid structural damage caused by a single force, and at the same time allow the water collection box 2 to be stably and firmly attached to the base 1, ensuring that the water collection box 2 is always in a horizontal state.

[0054] A fixing column 51 is fixedly connected to the outer wall of the conveying pipe 5, and a fixing groove 511 is opened on the side wall of the fixing column 51.

[0055] Specifically, the fixing post 51 is fixedly connected to the outer wall of the conveying pipe 5. The fixing groove 511 opened on its side wall provides a dedicated locking and fixing space for the control harness connecting the third solenoid valve 53. It is a supporting structure to ensure the orderly arrangement and stable connection of the harness. As an electric control component inside the mounting cylinder 52, the third solenoid valve 53 needs to be connected to an external controller through the harness to achieve precise on / off control. The conveying pipe 5 and the mounting cylinder 52 need to complete the lifting and lowering action with the conveying assembly 24. If the harness is arranged randomly without fixed constraints, during the lowering and lifting of the conveying pipe 5, the harness is prone to getting tangled or pulled with the conveying pipe 5, the traction rope 244 or surrounding structures. It may also suffer damage to the outer sheath or breakage of the core wire due to friction with hard objects, which may lead to the third solenoid valve 53 being unable to operate. 3. The interruption of the connection with the controller prevents the normal opening and closing of the valve, directly affecting the entire negative pressure water intake process. However, after the wiring harness connecting the third solenoid valve 53 is inserted into the fixing groove 511, the wiring harness will be orderly limited and attached to the side wall of the delivery pipe 5, and move up and down synchronously with the delivery pipe 5. This avoids the problem of the wiring harness getting tangled or pulled, and also prevents the wiring harness from directly rubbing against the external structure, effectively protecting the integrity of the wiring harness and ensuring the connection stability and signal transmission smoothness of the control wiring harness of the third solenoid valve 53. At the same time, the locking and fixing of the fixing groove 511 makes the wiring harness arrangement more regular, which is convenient for operators to inspect and maintain the device, reduces the problem of detection operation interruption caused by wiring harness failure, and provides a guarantee for the overall reliability of the device operation.

[0056] The side walls of the first baffle 254 and the second baffle 255 are both provided with rubber layers, and the side wall of the base 1 is provided with a placement groove 11.

[0057] Specifically, this structure ensures the airtightness of water sample flow through multi-part sealing design, while relying on dedicated storage slots to avoid structural interference during device disassembly and assembly. It guarantees the stable operation of the testing device from both sealing and assembly compatibility perspectives. In terms of sealing, the rubber layers on the sidewalls of the first baffle 254 and the second baffle 255 form a flexible seal with the inner wall of the collection cylinder 251. When the drive column 253 moves the two baffles within the collection cylinder 251, the rubber layers tightly adhere to the inner wall of the collection cylinder 251, filling the gaps between the baffles and the cylinder wall. This effectively prevents water sample leakage from the collection box 2 during the dispensing process and also prevents outside air from entering the collection cylinder 251 and contacting the water sample, ensuring the original position of the dispensed water sample. The sealing rings at the upper end of the abutment pipe 13 and the upper end of the first connecting pipe 212 respectively connect the abutment pipe 13 to the second connecting pipe 222 and the first connecting pipe 212 to the third port 31. The contact points form a rigid seal, fitting the gaps between the joints. This prevents air leakage during vacuuming, which could lead to negative pressure failure, and also avoids water leakage during water sampling and testing. It comprehensively ensures the sealing of all connection points and water sample contact points of the device, structurally reducing the possibility of water sample contact with air and water sample leakage, thus ensuring the accuracy of test results. In terms of assembly and adaptation, the placement groove 11 on the side wall of the base 1 provides a dedicated storage space for the collection component 25. During the installation and disassembly of the water collection box 2, the operator can pre-lock and store the collection component 25 in the placement groove 11, so that the disassembly and assembly paths of the collection component 25, the base 1, and the water collection box 2 do not intersect. This effectively avoids positional conflicts between the collection component 25 and the base 1 and the water collection box 2, which could hinder the fitting and assembly or smooth disassembly of the water collection box 2, making the disassembly and assembly of the water collection box 2 smoother and improving the ease of operation of the device.

[0058] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for detecting heavy metal content in groundwater in oasis areas, comprising a base (1), characterized in that, A through hole (12) is provided at the center of the lower surface of the base (1). A support component (14) is provided at the lower end of the base (1). A water collection box (2) is provided at the upper end of the base (1). A cover plate (3) is provided at the upper end of the base (1) and connected through the water collection box (2). A fixing component (4) is provided at the upper end of the cover plate (3). A conveying pipe (5) is fixedly connected to the inner wall at the lower end of the through hole (12). The water collection box (2) has a first opening (21) and a second opening (22) on its upper and lower surfaces, respectively. The first opening (21) is provided with a first solenoid valve (211) at its upper end and a first connecting pipe (212) at its upper end. The second opening (22) is provided with a second solenoid valve (221) at its lower end and a second connecting pipe (222) at its lower end. The water collection box (2) has two drain outlets (23) at its lower end. The water collection box (2) has a conveying component (24) on its lower surface and a collection component (25) on the inner wall of the drain outlet (23). The collection assembly (25) includes a collection cylinder (251). The outer walls at both ends of the collection cylinder (251) are threaded. A rotating ring (252) is fixedly connected to the outer wall in the middle of the collection cylinder (251). A drive column (253) is movably connected to the inner wall of the collection cylinder (251). A first baffle (254) is fixedly connected to the upper end of the drive column (253). A second baffle (255) is fixedly connected to the side wall in the middle of the drive column (253). A connecting cylinder (256) is movably connected to the lower end of the drive column (253). A drive ring (257) is fixedly connected to the upper end of the connecting cylinder (256). The drive ring (257) is threadedly connected to the outer wall at the lower end of the collection cylinder (251). The outer wall at the upper end of the collection cylinder (251) is threadedly connected to the inner wall of the drain outlet (23).

2. The device for detecting heavy metal content in groundwater in oasis areas according to claim 1, characterized in that, The inner wall of the upper end of the through hole (12) is fixedly connected to the abutment pipe (13), the upper end of the abutment pipe (13) abuts against the inner wall of the second connecting pipe (222), a third through hole (31) is opened at the center of the upper surface of the cover plate (3), a third connecting pipe (32) is fixedly connected to the inner wall of the upper end of the third through hole (31), a vacuum pump (33) is fixedly connected to one end of the third connecting pipe (32), and the upper end of the first connecting pipe (212) abuts against the inner wall of the third through hole (31).

3. The device for detecting heavy metal content in groundwater in oasis areas according to claim 1, characterized in that, The fixing component (4) includes a drive disk (41) movably connected to the upper end of the cover plate (3), a threaded column (42) fixedly connected to the lower end of the drive disk (41), the lower end of the threaded column (42) penetrating the cover plate (3), the lower end of the threaded column (42) being movably connected to the upper surface of the base (1), a telescopic cylinder (43) being uniformly fixedly connected to the lower end of the cover plate (3), a telescopic column (44) being movably connected to the inner wall of the lower end of the telescopic cylinder (43), and the lower end of the telescopic column (44) being fixedly connected to the upper surface of the base (1).

4. The device for detecting heavy metal content in groundwater in oasis areas according to claim 1, characterized in that, The support assembly (14) includes a rotating seat (141) fixedly connected to the lower surface of the base (1), and a bracket (142) is movably connected to the inner wall of the rotating seat (141).

5. The device for detecting heavy metal content in groundwater in oasis areas according to claim 1, characterized in that, The conveying assembly (24) includes a rotary drive (241) fixedly connected to the lower surface of the base (1). A rotating column (242) is fixedly connected to the output end of the rotary drive (241). A winding reel (243) is fixedly connected to the side wall of the rotating column (242). A traction rope (244) is fixedly connected to the side wall of the winding reel (243). A fixing plate (245) is movably connected to the end of the rotating column (242) away from the rotary drive (241). The upper end of the fixing plate (245) is fixedly connected to the lower surface of the base (1).

6. The device for detecting heavy metal content in groundwater in oasis areas according to claim 1, characterized in that, An installation cylinder (52) is fixedly connected to the outer wall of the lower end of the conveying pipe (5), a third solenoid valve (53) is fixedly connected to the inner wall of the lower end of the installation cylinder (52), and an adjustment component (6) is provided at the lower end of the conveying pipe (5).

7. The device for detecting heavy metal content in groundwater in oasis areas according to claim 6, characterized in that, The adjustment component (6) includes a mounting ring (61) fixedly connected to the outer wall of the mounting cylinder (52). The lower surface of the mounting ring (61) is evenly provided with multiple threaded grooves (62). The inner wall of the threaded grooves (62) is threadedly connected to a mounting post (63). The lower end of the mounting post (63) is fixedly connected to a counterweight ball (64).

8. The device for detecting heavy metal content in groundwater in oasis areas according to claim 1, characterized in that, The lower surface of the water collection box (2) is uniformly fixedly connected with a support plate (26), and the lower end of the support plate (26) abuts against the upper surface of the base (1).

9. A device for detecting heavy metal content in groundwater in oasis areas according to claim 1, characterized in that, The outer wall of the conveying pipe (5) is fixedly connected to a fixing column (51), and the side wall of the fixing column (51) is provided with a fixing groove (511).

10. A device for detecting heavy metal content in groundwater in oasis areas according to claim 1, characterized in that, The side walls of the first baffle (254) and the second baffle (255) are both provided with rubber layers, and the side wall of the base (1) is provided with a placement groove (11).

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