An in-situ device for detecting groundwater nitrate contamination

Abstract

This invention relates to the field of groundwater pollution detection technology, specifically providing an in-situ detection device for nitrate pollution in groundwater. The mounting body has a clamping portion for mounting on one side of the wellhead; the clamping assembly includes a first clamping member driven by a first driving member, which is disposed opposite to the clamping portion and can move under the drive of the first driving member to clamp or release the edge of the wellhead; the deployment assembly includes a winding mechanism and a locking structure driven by the first driving member, the locking structure unlocking or locking the winding mechanism under the drive of the first driving member; the detection unit is connected to the winding mechanism via a flexible member, and when the winding mechanism is unlocked, the flexible member is allowed to release, allowing the detection unit to fall under its own weight. This invention uses a single driving member to simultaneously drive the clamping assembly to complete both wellhead fixing and locking structure unlocking of the winding mechanism, achieving a continuous action between device fixing and detection unit deployment, significantly improving on-site operation efficiency and reducing operational complexity.

Description

Technical Field

[0001] This invention relates to the field of groundwater pollution detection technology, and more specifically, to an in-situ detection device for nitrate pollution in groundwater. Background Technology

[0002] In-situ groundwater testing involves measuring groundwater directly at its actual location without pumping it up, providing a more accurate reflection of groundwater quality. Currently, in-situ testing for nitrate contamination in groundwater, electrochemical sensors are typically deployed into the well to contact the groundwater and measure nitrate concentration. A common practice is to first place the mounting plate of the testing device at the wellhead, securing it manually or with auxiliary tools to prevent movement during testing; then, the cable or rope connected to the sensor is slowly lowered into the groundwater for detection.

[0003] The problem with the above-described method is that wellhead fixing and sensor deployment are two independent steps, requiring operators to complete both actions sequentially, resulting in a long preparation time. This step-by-step approach is particularly problematic in scenarios requiring frequent changes to detection points or rapid screening of multiple locations, severely impacting on-site detection efficiency. Summary of the Invention

[0004] The problem solved by this invention is the low efficiency of on-site detection due to the separate operation of wellhead fixing and sensor deployment in the prior art.

[0005] To address the above problems, this invention provides an in-situ detection device for nitrate pollution in groundwater, comprising: The mounting body has a clamping part for mounting on one side of the wellhead; The first driving component is mounted on the mounting body; A clamping assembly includes a first clamping member that is throttle-connected to the first driving member. The first clamping member is disposed opposite to the clamping part and is used to move relative to the clamping part under the drive of the first driving member so as to clamp or release the wellhead edge together with the clamping part. The delivery component includes a winding mechanism and a locking structure that is driveably connected to the first drive member, the locking structure being used to unlock or lock the winding mechanism under the drive of the first drive member. The detection unit is connected to the winding mechanism via a flexible component; the winding mechanism allows the flexible component to be released in the unlocked state, so that the detection unit falls under its own weight.

[0006] Preferably, the first driving member includes a first gear, and the clamping assembly further includes a first rack that meshes with the first gear, the first rack being connected to the first clamping member; the locking structure includes a second rack that meshes with the first gear.

[0007] Preferably, the locking structure includes: The extension is fixed to the second rack; The first limiting block is fixed to the extension member; The second limiting block is movably disposed on the mounting body; A transmission component connects the first limiting block and the second limiting block, and is used to convert the movement of the first limiting block into the reverse movement of the second limiting block; the first limiting block and the second limiting block move towards each other to clamp and lock the winding mechanism, and the first limiting block and the second limiting block move away from each other to release and unlock the winding mechanism.

[0008] Preferably, the transmission assembly includes: The third rack is fixed to the first limiting block; The fourth rack is fixed to the second limiting block; The fifth gear, the sixth gear, the rotating shaft, and the bushing are provided. The fifth gear and the sixth gear are fixedly connected by the bushing. The rotating shaft passes through the bushing and is connected to the mounting body. The third rack meshes with the fifth gear, and the fourth rack meshes with the sixth gear.

[0009] Preferably, the winding mechanism includes at least one roller, the flexible element is wound around the roller and one end is connected to the detection unit; The locking structure cooperates with the roller to prevent the roller from rotating in the locked state and to allow the roller to rotate freely in the unlocked state.

[0010] Preferably, the flexible component is a cable, and the detection unit includes an electrochemical sensor and a counterweight supporting the electrochemical sensor; the cable is electrically connected to the electrochemical sensor for transmitting detection signals.

[0011] Preferably, the detection unit further includes a float, which is fixed to the cable and located above the counterweight.

[0012] Preferably, it further includes an adjustment component for adjusting the guide path of the flexible element to change the horizontal position of the detection unit when it falls.

[0013] Preferably, the adjustment assembly includes an extension member connected to the mounting body, an adjustment member slidably disposed within the extension member, and an adjustment drive mechanism for driving the adjustment member to move relative to the extension member; the flexible member bypasses a guide wheel disposed at the end of the adjustment member, and the movement of the adjustment member changes the horizontal position of the guide wheel, thereby changing the guide path of the flexible member.

[0014] Preferably, the adjustment drive mechanism includes a lead screw rotatably connected to the extension member and an adjustment motor for driving the lead screw to rotate, and the adjustment member is threadedly connected to the lead screw.

[0015] The beneficial effects of the in-situ detection device for groundwater nitrate pollution of the present invention are as follows: through the coordinated operation of the mounting body, the first driving component, the clamping assembly, the deployment assembly, and the detection unit, the linkage operation of wellhead fixing and detection unit deployment is realized. Firstly, the mounting body has a clamping portion for placement on one side of the wellhead. The first driving component is mounted on the mounting body. The clamping assembly includes a first clamping member that is pulsatorically connected to the first driving component. This first clamping member is disposed opposite to the clamping portion and can move relative to the clamping portion under the drive of the first driving component to clamp or release the edge of the wellhead. Thus, the operator only needs to drive the first driving component to bring the first clamping member closer to the clamping portion, thereby quickly and stably clamping the mounting body to the edge of the wellhead. This clamping method does not require external tools or additional fixing structures, is simple to operate, and provides reliable fixation, effectively preventing device shaking or displacement during detection and ensuring the stability of subsequent detection. Secondly, the deployment component includes a winding mechanism and a locking structure that is driven by the first driving component. This locking structure unlocks or locks the winding mechanism under the drive of the first driving component. The detection unit is connected to the winding mechanism via a flexible component. When the winding mechanism is unlocked, the flexible component is released, allowing the detection unit to fall under its own weight. Therefore, when the first driving component drives the first clamping component to clamp the wellhead, the locking structure is simultaneously driven to the unlocked state, the winding mechanism releases the flexible component, and the detection unit automatically falls into the groundwater under its own weight. This design links the wellhead clamping action and the detection unit deployment action through the same driving component, eliminating the need for separate deployment steps and simplifying the on-site operation process.

[0016] Compared to existing technologies, the technical solution of this invention uses a single driving component to simultaneously drive the clamping assembly to complete the wellhead fixing and the locking structure to unlock the winding mechanism. This merges the two originally separate operations of device fixing and detection unit deployment into a single, continuous action. Operators only need to activate the driving component to complete the installation and fixing of the device and the automatic deployment of the detection unit within seconds, significantly improving the on-site efficiency of groundwater nitrate pollution detection and reducing operational complexity and labor costs. Furthermore, the detection unit falls under its own weight, requiring no additional power source, resulting in a simple structure and high reliability. Attached Figure Description

[0017] Figure 1 This is a reference diagram for the use of the in-situ detection device for groundwater nitrate pollution according to the present invention; Figure 2 This is a three-dimensional schematic diagram of the in-situ detection device for groundwater nitrate pollution according to the present invention; Figure 3 for Figure 1 A three-dimensional schematic diagram of the structure shown from another perspective; Figure 4 for Figure 1 The diagram shown is an exploded view of the structure after the detection unit has been removed. Figure 5 for Figure 4 An exploded view of the structure shown after removing the adjustment component; Figure 6 for Figure 5 A magnified view of the structure shown at point A; Figure 7 for Figure 4 The diagram shown is an exploded view of the structure after removing the delivery component.

[0018] Explanation of reference numerals in the attached figures: 1. Mounting body; 2. Clamping part; 3. First driving component; 4. First clamping component; 5. Flexible component; 6. First gear; 7. First rack; 8. Second rack; 9. Extension component; 10. First limiting block; 11. Second limiting block; 12. Roller; 13. Second driving component; 14. Third rack; 15. Fourth rack; 16. Fifth gear; 17. Sixth gear; 18. Rotating shaft; 19. Bushing; 20. Electrochemical sensor; 21. Counterweight; 22. Float; 23. Extension component; 24. Adjusting component; 25. Guide wheel; 26. Lead screw; 27. Adjusting motor; 28. Bracket. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] The in-situ detection device for groundwater nitrate pollution provided in this embodiment, such as... Figures 1 to 7 As shown, the system includes a mounting body 1, a first driving component 3, a clamping assembly, a delivery assembly, and a detection unit. The mounting body 1 is used to mount the system at the wellhead of the well to be tested, and it has a clamping part 2 for mounting on one side of the wellhead. This clamping part 2 can be a flange or fixing plate integrally formed on the lower end face of the mounting body 1, used to abut against one side of the edge of the wellhead. The first driving component 3 is mounted on the mounting body 1 and can be a power source such as a rotary motor or a manual wheel to output driving force.

[0023] The clamping assembly includes a first clamping member 4, which is pulsatorically connected to the first driving member 3 and is disposed opposite to the clamping part 2. Specifically, the first driving member 3 drives the first clamping member 4 to slide relative to the clamping part 2, for example, the first driving member 3 drives the first clamping member 4 to slide horizontally through a gear and rack mechanism or a lead screw and nut mechanism. When the first clamping member 4 approaches the clamping part 2, the two together clamp the edge of the wellhead, so that the mounting body 1 is firmly fixed on the wellhead; when the first clamping member 4 moves away from the clamping part 2, the edge of the wellhead is released, making it easy to remove the device.

[0024] The delivery assembly includes a winding mechanism and a locking structure. The winding mechanism can be a rotatable roller 12 or a spool, used for winding or guiding the flexible element 5. The locking structure is driven by the first drive member 3, meaning that the power output from the first drive member 3 simultaneously acts on the locking structure. Under the drive of the first drive member 3, the locking structure can switch between an unlocked state and a locked state, thereby allowing or preventing the rotation of the winding mechanism, respectively. For example, the locking structure can be a retractable stop; when the stop abuts against the roller 12, the roller 12 cannot rotate, i.e., it is in the locked state; when the stop moves away from the roller 12, the roller 12 can rotate freely, i.e., it is in the unlocked state.

[0025] The detection unit is connected to the winding mechanism via a flexible component 5, such as a rope or cable. When the locking structure is unlocked, the winding mechanism allows the flexible component 5 to be released, meaning the roller 12 can rotate freely to allow the flexible component 5 to unfold downwards. At this time, the detection unit falls along the wellhead direction under its own weight until it enters the groundwater, thereby performing in-situ detection of nitrate concentration.

[0026] In actual use, such as Figure 1 As shown, the operator first places the mounting body 1 above the wellhead, with the clamping part 2 abutting against one side of the wellhead edge. Then, the first drive unit 3 is activated, and the power output from the first drive unit 3 is simultaneously transmitted to the clamping assembly and the locking structure: on one hand, the first clamping part 4 in the clamping assembly moves towards the clamping part 2 under the power drive until it clamps the wellhead edge together with the clamping part 2, completing the fixation of the mounting body 1; on the other hand, the locking structure switches from the locked state to the unlocked state under the drive of the first drive unit 3, releasing the winding mechanism from the constraint of the flexible part 5. At this time, under its own weight, the detection unit is gradually lowered from the winding mechanism through the flexible part 5 and falls into the groundwater in the well, beginning the in-situ detection of nitrate contamination.

[0027] When the inspection is complete and the device needs to be retrieved, the operator first uses the retrieval drive mechanism (e.g., manually or electrically driven to rotate the winding mechanism in the opposite direction) to wind the flexible component 5 upwards, raising the inspection unit from the water to above the wellhead. After the flexible component 5 is fully wound up, the first drive component 3 is activated in the reverse direction, moving the first clamping component 4 away from the clamping part 2 to release the edge of the wellhead. Simultaneously, the locking structure is switched to the locked state, or switched from the external control to the locked state, thereby restricting the rotation of the winding mechanism and preventing the flexible component 5 from being accidentally released. The entire device can then be removed from the wellhead.

[0028] In summary, this embodiment achieves linkage between installation and deployment of the detection unit by synchronously controlling the clamping action of the clamping assembly on the wellhead and the unlocking action of the locking structure on the winding mechanism using the same first driving component 3. When the first driving component 3 drives the first clamping component 4 to clamp the wellhead, the locking structure simultaneously unlocks the winding mechanism, and the detection unit automatically falls; conversely, when the first driving component 3 reverses its direction to release the wellhead, the locking structure re-locks, facilitating retrieval. This design simplifies the operation steps and improves on-site detection efficiency.

[0029] As an optimized implementation method, such as Figure 4 and Figure 7As shown, the first driving component 3 includes a first gear 6. This first gear 6 can be driven to rotate by a motor or by a manual rotary wheel. The clamping assembly also includes a first rack 7 meshing with the first gear 6. The first rack 7 is connected to the first clamping component 4, and the first rack 7 and / or the first clamping component 4 are slidably connected to the mounting body 1. When the first gear 6 rotates, the first rack 7 moves linearly, thereby driving the first clamping component 4 closer to or further away from the clamping part 2, achieving the action of clamping or releasing the wellhead edge. Simultaneously, the locking structure includes a second rack 8 meshing with the first gear 6, and the second rack 8 is slidably connected to the mounting body 1. When the first gear 6 rotates, the second rack 8 also moves linearly synchronously. Since it is positioned opposite to the first rack 7, its direction of movement is opposite to that of the first rack 7. Thus, the same first gear 6 drives both the first rack 7 to perform the clamping action and the second rack 8 to perform the unlocking action; their movements are synchronized and linked: when the first clamping component 4 clamps the wellhead, the second rack 8 moves precisely in the unlocking direction; and vice versa. This design allows operators to simultaneously complete the interlocking operations of wellhead fixing and detection unit deployment preparation simply by controlling the forward and reverse rotation of the first gear 6.

[0030] Furthermore, such as Figure 5 and Figure 6 As shown, the locking structure includes: an extension 9, a first limiting block 10, a second limiting block 11, and a transmission assembly.

[0031] Specifically, the extension 9 is fixed to the second rack 8. When the second rack 8 moves linearly, the extension 9 moves in the same direction. The first limiting block 10 is fixed to the extension 9. Therefore, the first limiting block 10 moves with the movement of the second rack 8. The second limiting block 11 is movably disposed on the mounting body 1, for example, by means of a slide groove or guide rail, so that it can slide relative to the mounting body 1. It should be noted that the sliding mounting structure between the second limiting block 11 and the mounting body 1 is not shown in the accompanying drawings.

[0032] The transmission assembly connects the first limiting block 10 and the second limiting block 11, and is used to convert the movement of the first limiting block 10 into the reverse movement of the second limiting block 11. That is, when the first limiting block 10 moves in a certain direction, the second limiting block 11 moves in the opposite direction.

[0033] When the first limiting block 10 and the second limiting block 11 move toward each other (approach each other), they together clamp and lock the winding mechanism, preventing the winding mechanism from rotating; when they move away from each other (move away from each other), they release the lock on the winding mechanism, allowing the winding mechanism to rotate freely.

[0034] When the first gear 6 drives the second rack 8 to move outward, the extension 9 and the first limiting block 10 move outward accordingly. After the transmission assembly reverses the direction of this movement, the second limiting block 11 moves inward synchronously (in the opposite direction to the movement of the first limiting block 10). At this time, the first limiting block 10 and the second limiting block 11 move away from each other, and the winding mechanism is unlocked. When the first gear 6 rotates in the opposite direction, the second rack 8 retracts inward, the first limiting block 10 moves inward, and the transmission assembly drives the second limiting block 11 to move outward. The two limiting blocks move closer to each other, thereby clamping and locking the winding mechanism. This dual-sided synchronous locking method makes the locking force more balanced, preventing the winding mechanism from deflecting or being damaged due to force on one side.

[0035] Furthermore, the winding mechanism includes a roller 12 and a second drive member 13. The roller 12 is rotatably mounted on a bracket 28 on the mounting body 1, and the second drive member 13 is disposed on one side of the bracket 28 and connected to the roller 12. The flexible member 5 passes around the roller 12, and the second drive member 13 drives the roller 12 to rotate, so that the rotation of the roller 12 can tension or release the flexible member 5. The flexible member 5 is a cable. This cable serves both as a load-bearing component for suspending the detection unit and as a signal transmission cable. It should be noted that the detection unit can fall under its own weight, and the second drive member 13 is used to control the falling speed, which is a more optimal solution.

[0036] The first limiting block 10 and the second limiting block 11 respectively cooperate with the roller 12. When the limiting blocks move towards each other, they abut against the wheel surface or rim of the roller 12 from both sides, preventing the roller 12 from rotating by friction or mechanical locking. At this time, the winding mechanism is in a locked state, the flexible member 5 cannot be released, and the detection unit remains in the upper position. When the limiting blocks move away from each other (away from each other), they disengage from the roller 12, the roller 12 returns to a free rotation state, the winding mechanism is in an unlocked state, and at this time, under the weight of the detection unit itself, the flexible member 5 drives the roller 12 to rotate and unfold downwards, causing the detection unit to fall into the groundwater.

[0037] Furthermore, such as Figure 6 As shown, the transmission assembly includes: a third rack 14, a fourth rack 15, a fifth gear 16, a sixth gear 17, a rotating shaft 18, and a bushing 19.

[0038] Specifically, the third rack 14 is fixed to the first limiting block 10. When the first limiting block 10 moves, the third rack 14 moves accordingly. The fourth rack 15 is fixed to the second limiting block 11. When the second limiting block 11 moves, the fourth rack 15 moves accordingly. The fifth gear 16 and the sixth gear 17 are connected and fixed through the bushing 19, and both are coaxial and rotate synchronously. The rotating shaft 18 passes through the bushing 19 and is connected to the mounting body 1, allowing the fifth gear 16 and the sixth gear 17 to rotate freely around the rotating shaft 18. The third rack 14 meshes with the fifth gear 16, and the fourth rack 15 meshes with the sixth gear 17. Since the fifth gear 16 and the sixth gear 17 are coaxially fixed, they always rotate at the same angular velocity and in the same direction.

[0039] When the first limiting block 10, together with the third rack 14, moves linearly in a certain direction, the third rack 14 drives the fifth gear 16 to rotate. Since the fifth gear 16 is fixedly connected to the sixth gear 17, the sixth gear 17 rotates in the same direction, thereby driving the fourth rack 15, which meshes with it, to move linearly in the opposite direction. Therefore, the fourth rack 15 drives the second limiting block 11 to move in the opposite direction to the first limiting block 10. This gear and rack transmission assembly achieves the function that "the moving direction of the first limiting block 10 is always opposite to the moving direction of the second limiting block 11," enabling the limiting blocks to move symmetrically towards or away from each other, thereby synchronously locking or unlocking the roller 12.

[0040] As an optimized implementation method, such as Figure 1 As shown, the detection unit includes an electrochemical sensor 20 and a counterweight 21. The counterweight 21 supports the electrochemical sensor 20 and has sufficient weight to overcome buoyancy and friction in the unlocked state, causing the sensor to sink. The electrochemical sensor 20 and the counterweight 21 are detachably connected for easy replacement or maintenance.

[0041] The cable is electrically connected to the electrochemical sensor 20. After the detection unit is lowered into the groundwater, the electrochemical sensor 20 begins detecting nitrate concentration. The generated detection signal is transmitted in real-time via the cable to an external data processing device or display terminal for personnel to read and record. Thus, this device solves the problem of real-time signal transmission while simultaneously achieving physical deployment.

[0042] Furthermore, this embodiment optimizes the underwater positioning of the sensor by adding a float 22. The float 22 is fixed to the cable and located above the counterweight 21. The float 22 can be made of a hollow, sealed buoyancy material, providing buoyancy less than the weight of the counterweight 21 but greater than the weight of the electrochemical sensor 20 itself. When the detection unit falls to the water surface, the counterweight 21 continues to sink under gravity, pulling the electrochemical sensor 20 into the water; while the float 22 floats above or near the water surface, exerting an upward pull on the cable. Because the float 22 is fixed to the cable and located above the counterweight 21, it limits the further sinking depth of the counterweight 21, ensuring that the electrochemical sensor 20 is kept within a predetermined depth range below the water surface, neither sinking into the bottom silt due to excessive weight nor floating to the surface due to insufficient lightness. This ensures that the sensor is always at an effective detection level for groundwater, improving the stability and accuracy of the detection data.

[0043] As an optimized implementation, the detection device further includes an adjustment component for optimizing the descent position of the detection unit. The adjustment component adjusts the guide path of the flexible element 5, thereby changing the horizontal position of the detection unit during descent. In practical applications, water flow in the well may affect the descent trajectory of the detection unit, and the water flow in the central area of ​​the wellhead is usually slower, causing less interference with the detection results. Therefore, by changing the guide path of the flexible element 5 through the adjustment component, the detection unit is guided directly above the central area of ​​the wellhead before descent, effectively reducing the influence of water flow on the sensor position and improving the stability and accuracy of the detection. The adjustment component can change the guide path through manual or electric adjustment.

[0044] Furthermore, such as Figures 1 to 4 As shown, the adjustment assembly includes an extension member 23, an adjustment member 24, and an adjustment drive mechanism.

[0045] The extension member 23 is connected to the mounting body 1, for example, by bolts or integral molding, and extends to the outside or side of the mounting body 1. The adjusting member 24 is slidably disposed within the extension member 23, for example, by a groove or guide rail, allowing the adjusting member 24 to slide horizontally relative to the extension member 23. An adjustment drive mechanism is used to drive the adjusting member 24 to move relative to the extension member 23, and can be in the form of a manual lead screw 26, an electric push rod, or a gear and rack mechanism.

[0046] The flexible component 5 bypasses the guide wheel 25 located at the end of the adjusting component 24. This guide wheel 25 is either the roller 12 in the aforementioned winding mechanism or an independently installed guide wheel 25. When the adjusting component 24 moves, it drives the guide wheel 25 at its end to move horizontally as well, thereby changing the horizontal position of the guide wheel 25. Because the flexible component 5 bypasses the guide wheel 25, the change in the position of the guide wheel 25 directly alters the guiding path of the flexible component 5, thus correspondingly changing the horizontal position of the landing point of the detection unit suspended at the end of the flexible component 5. Therefore, the operator can pre-adjust the extension length of the adjusting component 24 according to the actual size of the wellhead and the water flow conditions inside the well, ensuring that the detection unit is precisely aligned with the center area of ​​the wellhead before deployment.

[0047] Furthermore, the adjustment drive mechanism includes a lead screw 26 and an adjustment motor 27. The lead screw 26 is rotatably connected to the extension member 23, that is, both ends of the lead screw 26 are mounted inside the extension member 23 via bearings, allowing free rotation but with a fixed axial position. The adjustment motor 27 is fixedly mounted on the extension member 23 or the mounting body 1, and its output shaft is drively connected to the lead screw 26 to drive the lead screw 26 to rotate. The adjustment member 24 is threadedly connected to the lead screw 26; for example, the adjustment member 24 has an internal threaded hole that mates with the lead screw 26.

[0048] When the motor drives the lead screw 26 to rotate in the forward or reverse direction, since the axial position of the lead screw 26 is fixed, the adjusting component 24, which is threaded to it, will move linearly along the axial direction of the lead screw 26, thereby extending or retracting the adjusting component 24 relative to the extension component 23. The operator can precisely control the moving distance of the adjusting component 24 by controlling the direction of rotation and the number of rotations of the motor, and thus precisely adjust the horizontal position of the guide wheel 25. This lead screw 26 transmission method has a self-locking characteristic, that is, the position of the adjusting component 24 can remain stable after the motor stops, preventing displacement due to vibration or external force during the detection process, and ensuring the accuracy of the detection unit's falling position.

[0049] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. An in-situ detection device for nitrate pollution in groundwater, characterized in that, include: The mounting body (1) has a clamping part (2) for mounting on one side of the wellhead; The first driving component (3) is installed on the mounting body (1); The clamping assembly includes a first clamping member (4) which is pulsatorically connected to the first driving member (3). The first clamping member (4) is disposed opposite to the clamping part (2) and is used to move relative to the clamping part (2) under the drive of the first driving member (3) so as to clamp or release the wellhead edge together with the clamping part (2). The delivery component includes a winding mechanism and a locking structure that is driven by the first drive member (3), the locking structure being used to unlock or lock the winding mechanism under the drive of the first drive member (3); The detection unit is connected to the winding mechanism via a flexible member (5); the winding mechanism allows the flexible member (5) to be released in the unlocked state so that the detection unit falls under its own weight.

2. The in-situ detection device for groundwater nitrate pollution according to claim 1, characterized in that, The first driving member (3) includes a first gear (6), and the clamping assembly further includes a first rack (7) that meshes with the first gear (6), the first rack (7) being connected to the first clamping member (4); the locking structure includes a second rack (8) that meshes with the first gear (6).

3. The in-situ detection device for groundwater nitrate pollution according to claim 2, characterized in that, The locking structure includes: The extension (9) is fixed to the second rack (8); The first limiting block (10) is fixed to the extension (9); The second limiting block (11) is movably disposed on the mounting body (1). A transmission assembly connects the first limiting block (10) and the second limiting block (11) to convert the movement of the first limiting block (10) into the reverse movement of the second limiting block (11); the first limiting block (10) and the second limiting block (11) move toward each other to clamp and lock the winding mechanism, and the first limiting block (10) and the second limiting block (11) move away from each other to release and unlock the winding mechanism.

4. The in-situ detection device for groundwater nitrate pollution according to claim 3, characterized in that, The transmission assembly includes: The third rack (14) is fixed to the first limiting block (10); The fourth rack (15) is fixed to the second limiting block (11); The fifth gear (16), the sixth gear (17), the rotating shaft (18), and the bushing (19) are fixedly connected by the bushing (19). The rotating shaft (18) passes through the bushing (19) and is connected to the mounting body (1). The third rack (14) meshes with the fifth gear (16), and the fourth rack (15) meshes with the sixth gear (17).

5. The in-situ detection device for groundwater nitrate pollution according to any one of claims 1-4, characterized in that, The winding mechanism includes at least one roller (12), the flexible member (5) is wound around the roller (12) and one end is connected to the detection unit; The locking structure cooperates with the roller (12) to prevent the roller (12) from rotating in the locked state and to allow the roller (12) to rotate freely in the unlocked state.

6. The in-situ detection device for groundwater nitrate pollution according to claim 5, characterized in that, The flexible component (5) is a cable, and the detection unit includes an electrochemical sensor (20) and a counterweight (21) supporting the electrochemical sensor (20); the cable is electrically connected to the electrochemical sensor (20) for transmitting detection signals.

7. The in-situ detection device for groundwater nitrate pollution according to claim 6, characterized in that, The detection unit also includes a float (22), which is fixed to the cable and located above the counterweight (21).

8. The in-situ detection device for groundwater nitrate pollution according to any one of claims 1-4, characterized in that, It also includes an adjustment component for adjusting the guide path of the flexible member (5) to change the horizontal position of the detection unit when it falls.

9. The in-situ detection device for groundwater nitrate pollution according to claim 8, characterized in that, The adjustment assembly includes an extension (23) connected to the mounting body (1), an adjustment member (24) slidably disposed within the extension (23), and an adjustment drive mechanism for driving the adjustment member (24) to move relative to the extension (23); the flexible member (5) bypasses a guide wheel (25) disposed at the end of the adjustment member (24), and the movement of the adjustment member (24) changes the horizontal position of the guide wheel (25), thereby changing the guide path of the flexible member (5).

10. The in-situ detection device for groundwater nitrate pollution according to claim 9, characterized in that, The adjustment drive mechanism includes a lead screw (26) rotatably connected to the extension member (23) and an adjustment motor (27) that drives the lead screw (26) to rotate. The adjustment member (24) is threadedly connected to the lead screw (26).

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