An environmental monitoring hydrogeological testing device and method

Abstract

The application relates to the technical field of environmental monitoring, and discloses an environmental monitoring hydrogeology testing device and method. The environmental monitoring hydrogeology testing device comprises a sampling cylinder, further comprises a sampling cover, the sampling cover is sleeved outside the sampling cylinder and can rotate by a preset angle around the sampling cylinder, a counterweight base is fixedly connected to the bottom of the sampling cylinder, a driving part for driving the counterweight base to rotate is arranged in the counterweight base, and a dynamic balance assembly is arranged in the counterweight base and used for realizing dynamic balance adjustment when the counterweight base rotates. The water flow is driven by a submersible pump to flow out through a tangential jet hole, the counterweight base is driven to rotate by a fluid reaction torque and vortex is formed, the water body is broken into layers, the well wall is cleaned, and the water sample uniformity is ensured. In addition, the sliding block is driven to move outward based on the centrifugal force, the mass distribution is automatically adjusted to offset the eccentric load, the starting rotational inertia is reduced, mechanical vibration during high-speed rotation is inhibited, and the stability of the sampling process is improved.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring technology, specifically to an environmental monitoring hydrogeological testing device and method. Background Technology

[0002] In groundwater environmental monitoring and hydrogeological surveys, accurately assessing the quality of groundwater requires not only understanding the current water quality baseline of the aquifer, but also grasping the pollution accumulation of stagnant water (i.e., "old water") in the monitoring well.

[0003] During the interval between two samplings, a certain amount of stagnant water usually accumulates in the well casing of groundwater monitoring wells. This part of the water is in a static state for a long time. Due to the physical, chemical and biological interactions with the well wall and the surrounding aquifer medium, its water quality indicators (such as dissolved oxygen, heavy metal concentration or volatile organic compound content) are often significantly different from those of fresh groundwater that is flowing. Therefore, a scientific monitoring process requires the separate collection and analysis of stagnant water and fresh groundwater: stagnant water samples are used to assess the degradation status of the water in the well and the short-term pollution risk, while fresh water samples are used to accurately reflect the water quality background of the in-situ aquifer.

[0004] Currently, due to the sedimentation of stagnant water, direct collection can lead to significant discrepancies between the water sample and the actual situation. Existing equipment struggles to effectively mix stagnant water during collection, resulting in reduced accuracy of the final water sample test results. Furthermore, existing devices require multiple lowering of the sampling equipment when performing multi-depth sampling, leading to reduced sampling efficiency. The lack of precise flow path control mechanisms also makes it easy for cross-contamination between water layers to occur, affecting the representativeness of the samples. Summary of the Invention

[0005] This invention provides an environmental monitoring hydrogeological testing device and method. A submersible pump drives water to flow through a tangential jet orifice and discharges it. The fluid reaction torque drives the counterweight to rotate and form a vortex, breaking up water stratification and cleaning the well wall while ensuring the uniformity of the water sample. By driving the sampling hood to rotate, the connection between the liquid inlet and the sample storage tank is precisely controlled, enabling stratified sampling of groundwater at different depths in a single descent. This solves the problems mentioned in the background art, such as the difficulty of effectively mixing stagnant water, resulting in reduced accuracy of water sample test results, low efficiency of multi-layer sampling, and easy cross-contamination of samples leading to inaccurate data.

[0006] This invention provides the following technical solution: An environmental monitoring hydrogeological testing device includes a sampling cylinder, and further includes: a sampling hood, which is sleeved on the outside of the sampling cylinder and can rotate around the sampling cylinder at a preset angle; a counterweight, which is fixedly connected to the bottom of the sampling cylinder and has a drive unit inside the counterweight to drive its own rotation; and a dynamic balancing assembly, which is disposed inside the counterweight and is used to achieve dynamic balance adjustment when the counterweight rotates. The top of the counterweight is equipped with a limit part to achieve stable lifting and lowering of the entire sampling cylinder inside the monitoring well.

[0007] As a preferred embodiment of the present invention, the sampling cylinder has multiple sets of sample storage slots evenly spaced along its axial direction. Each set of sample storage slots has sampling holes on both sides. Each set of sample storage slots has a partition fixedly connected to the middle. The sampling cover has multiple sets of liquid inlet holes on both sides in a spiral-shaped manner. A servo motor is fixedly connected to the top of the sampling cylinder. The output end of the servo motor is fixedly connected to the top of the inner cavity of the sampling cover. When the sampling cover rotates, the liquid inlet holes at different heights alternately communicate with the sampling holes on the same plane.

[0008] As a preferred embodiment of the present invention, the driving unit includes a submersible pump, which is fixedly connected to the hollow cavity of the counterweight seat. The counterweight seat has symmetrically arranged guide grooves and liquid extraction grooves inside. Two sets of output pipes are symmetrically installed on the submersible pump. The other ends of the two sets of output pipes are respectively connected to the guide grooves and the liquid extraction grooves. Solenoid valves are installed on both sets of output pipes. The counterweight seat has a spray groove inside, which is connected to the guide groove. Multiple sets of spray holes connected to the spray groove are equally spaced on the outer arc wall of the counterweight seat.

[0009] As a preferred embodiment of the present invention, the limiting part includes a positioning ring, a limiting groove is formed on the outer arc wall of the positioning ring, a rotating ring is rotatably connected in the limiting groove, multiple sets of support tubes are fixed at equal intervals on the top of the counterweight, the tops of the multiple sets of support tubes are all fixed on the outer wall of the rotating ring, multiple sets of spring telescopic rods are fixed at equal intervals on the top of the positioning ring, the end of each set of spring telescopic rods is rotatably connected to a limiting wheel through a hinge seat, and a lifting rope is fixedly connected to the top of the positioning ring. When the positioning ring is placed into the monitoring well as a whole, each set of limiting wheels is in contact with the inner wall of the monitoring well.

[0010] As a preferred embodiment of the present invention, one set of the support tubes is hollow, and the two ends of the hollow cavity of the support tube are respectively connected to the limiting slide groove and the liquid extraction groove. The support tube is provided with a solenoid valve to control the communication state of the hollow cavity. Multiple sets of liquid guide tubes connected to the limiting slide groove are fixedly connected to the inner arc wall of the positioning ring. The output ends of the multiple sets of liquid guide tubes are fixed and connected to the drain pipe.

[0011] As a preferred embodiment of the present invention, the dynamic balancing component includes a counterweight slider. Multiple sets of counterweight grooves are equally spaced along the circumference inside the counterweight seat. The counterweight slider is slidably connected in the counterweight groove. The counterweight groove is inclined towards the central axis of the counterweight seat, and a flushing hole is provided at the bottom of the inclined upper end of the counterweight groove. When the counterweight seat is placed horizontally, each set of counterweight sliders slides to the end of the counterweight groove close to the central axis of the counterweight seat.

[0012] As a preferred embodiment of the present invention, the sampling cylinder has a suction groove at its center, and a suction pipe is slidably connected in the suction groove. The outer wall of the suction pipe has negative pressure holes that match the number of sample storage slots along its axial direction. Suction holes are provided on both sides of the top of each set of partitions. A negative pressure groove is provided in the counterweight seat. The bottom end of the suction pipe extends into the negative pressure groove. The inclined bottom ends of each set of counterweight sliding grooves are interconnected. The top of the inclined lower ends of two sets of counterweight sliding grooves are fixed and connected to a guide pipe. The other end of the guide pipe is connected to the inner cavity of the negative pressure groove. When the suction pipe slides in the suction groove to the exhaust position, the suction hole is connected to the negative pressure hole.

[0013] As a preferred embodiment of the present invention, the bottom of the inner cavity of the sampling cylinder is provided with a switching groove communicating with the suction groove. A switching plate is slidably connected in the switching groove. The inner end of the switching plate is fixedly connected to the outer wall of the suction pipe. Multiple sets of switching springs are fixed between the top of the switching plate and the top of the inner cavity of the switching groove. A lower trapezoidal block is fixedly connected to the outer end of the switching plate. An upper trapezoidal block is fixedly connected to the bottom of the sampling cover. The lower trapezoidal block and the upper trapezoidal block are adapted to each other. In the initial state, the upper trapezoidal block is in a squeezing state against the lower trapezoidal block, that is, the switching plate is located at the bottom of the switching groove. At this time, the suction hole is connected to the negative pressure hole.

[0014] As a preferred technical solution of the present invention, a filter membrane is provided in one of the sampling holes of each group of sample storage tanks, that is, the same group of sample storage tanks can realize the collection of two kinds of water samples at the same height.

[0015] An environmental monitoring hydrogeological testing method includes the following steps: Step 1: Place the entire sampling tube into the monitoring well; Step 2: Stir the stagnant water in the monitoring well and collect the mixed stagnant water; Step 3: Drain the stagnant water from the monitoring well and collect fresh water samples at different heights after groundwater re-enters. Step 4: Take out each water sample and perform component analysis separately.

[0016] Compared with the prior art, the present invention provides an environmental monitoring hydrogeological testing device and method, which has the following beneficial effects: 1. This environmental monitoring hydrogeological testing device uses a submersible pump to drive water flow through tangential jet holes and discharge it. The fluid reaction torque drives the counterweight to rotate and form a vortex, breaking up water stratification and cleaning the well wall while ensuring the uniformity of the water sample. In addition, based on centrifugal force, the slider moves outward and automatically adjusts the mass distribution to counteract the eccentric load, reduce the starting rotational inertia and suppress mechanical vibration during high-speed rotation, thereby improving the stability of the sampling process.

[0017] 2. This environmental monitoring hydrogeological testing device, by driving the sampling hood to rotate, precisely controls the connection between the liquid inlet and the sample storage tank, enabling layered sampling of groundwater at different depths in a single drop, effectively avoiding water mixing between layers and improving sampling efficiency; in addition, the filter membrane design supports the simultaneous acquisition of raw water and filtered water, meeting diverse testing needs, thereby ensuring the authenticity and representativeness of the final test data.

[0018] 3. This environmental monitoring hydrogeological testing device utilizes the volume change of the cavity generated by the sliding of the counterweight slider to create negative pressure, expelling air from the sample storage tank, effectively avoiding the "air seal" phenomenon, achieving rapid water sample intake, and significantly improving sampling efficiency; in addition, by switching the flow path, the old water in the well is discharged through the drain pipe, forcibly inducing fresh groundwater from the aquifer to flow into the well, ensuring that the most representative fresh water sample is collected. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0020] Figure 1 This is a first-view perspective stereoscopic diagram of the present invention; Figure 2 This is a second-view perspective stereoscopic diagram of the present invention; Figure 3 This is a schematic cross-sectional view of the entire invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram of region A in the middle; Figure 5 For the present invention Figure 3 Enlarged structural diagram of region B in the middle; Figure 6 For the present invention Figure 3 Enlarged structural diagram of region C in the middle; Figure 7 This is a schematic cross-sectional view of the counterweight base of the present invention; Figure 8 This is a schematic diagram of the flow guide channel structure of the present invention; Figure 9This is a schematic diagram of the jet channel structure of the present invention; Figure 10 This is a schematic diagram of the counterweight slide structure of the present invention.

[0021] In the diagram: 1. Sampling cylinder; 101. Sample storage tank; 102. Sampling hole; 103. Baffle plate; 104. Servo motor; 2. Sampling cover; 201. Liquid inlet; 3. Counterweight; 4. Submersible pump; 401. Guide channel; 402. Output pipe; 403. Spray channel; 404. Spray hole; 405. Liquid extraction tank; 5. Positioning ring; 501. Limiting slide; 502. Rotating ring; 503. Support pipe; 504. Spring extension. 505. Retracting rod; 506. Limiting wheel; 507. Liquid guide pipe; 508. Drain pipe; 509. Lifting rope; 6. Counterweight slider; 601. Counterweight slide groove; 602. Flushing hole; 7. Air extraction groove; 701. Air extraction pipe; 702. Air extraction hole; 703. Negative pressure groove; 704. Air guide pipe; 705. Negative pressure hole; 8. Switching groove; 801. Switching plate; 802. Switching spring; 803. Lower trapezoidal block; 804. Upper trapezoidal block. Detailed Implementation

[0022] 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.

[0023] Example 1: Reference Figures 1-10 An environmental monitoring hydrogeological testing device includes a sampling cylinder 1, and further includes: a sampling cover 2, which is sleeved on the outside of the sampling cylinder 1 and can rotate around the sampling cylinder 1 at a preset angle; a counterweight 3, which is fixedly connected to the bottom of the sampling cylinder 1 and has a drive unit inside the counterweight 3 to drive its own rotation; and a dynamic balancing component, which is installed inside the counterweight 3 and is used to achieve dynamic balance adjustment when the counterweight 3 rotates. The top of the counterweight 3 is equipped with a limit part to achieve stable lifting and lowering of the entire sampling cylinder 1 inside the monitoring well.

[0024] Reference Figures 1-4 and Figures 7-9The drive unit includes a submersible pump 4, which is fixedly connected to the hollow cavity of the counterweight 3. The counterweight 3 has symmetrically arranged guide channels 401 and suction channels 405 inside. Two sets of output pipes 402 are symmetrically installed on the submersible pump 4, with the other ends of each set connected to the guide channels 401 and suction channels 405 respectively. Solenoid valves are installed on both sets of output pipes 402. A jet channel 403 is opened inside the counterweight 3, connected to the guide channels 401. Multiple sets of jet holes 404, connected to the jet channels 403, are evenly spaced on the outer arc wall of the counterweight 3. The output ends of the jet holes 404 are tangential to the outer wall of the counterweight 3, thus generating a tangential jet effect. The limiting part includes a positioning ring 5. A limiting groove 501 is provided on the outer arc wall of ring 5. A rotating ring 502 is rotatably connected inside the limiting groove 501. Multiple sets of support tubes 503 are fixed at equal intervals on the top of the counterweight 3. The tops of the multiple sets of support tubes 503 are all fixed on the outer wall of the rotating ring 502. Multiple sets of spring telescopic rods 504 are fixed at equal intervals on the top of positioning ring 5. The end of each set of spring telescopic rods 504 is rotatably connected to a limiting wheel 505 through a hinge seat. A lifting rope 508 is fixedly connected to the top of positioning ring 5. The other end of the lifting rope 508 is fixed to a winch or other winding equipment. When the positioning ring 5 is placed into the monitoring well as a whole, each set of limiting wheels 505 is in contact with the inner wall of the monitoring well, realizing the stable lifting and lowering of the sampling cylinder 1 as a whole, and improving the sampling stability.

[0025] With the above-described structure, the submersible pump 4 is started, and the solenoid valve on the output pipe 402 connected to the guide channel 401 is in the open state (all other solenoid valves are in the closed state). At this time, the submersible pump 4 will draw the stagnant water in the monitoring well and transport it to the jet channel 403 through the output pipe 402 and the guide channel 401. Subsequently, the water will be discharged along each set of jet holes 404. At this time, the water will generate a tangential jet effect in the water body, thereby generating a rotational torque, which will cause the entire counterweight 3 to rotate around the positioning ring 5 and form a strong rotating vortex in the water body. At this point, the water flow near the counterweight 3 rotates at its fastest speed. According to Bernoulli's principle, a negative pressure zone will be formed here. Under the centrifugal force of the rotating counterweight 3, the water body will be thrown towards the well wall and forced to move downwards after hitting the well wall, while carrying away the residue attached to the well wall, completing the initial well washing. Then, the water flow will flow from the inside of the water body to the bottom of the counterweight 3, thus forming a vertical fluid circulation, i.e., secondary flow, which effectively breaks the stratification of the water body and allows the water flow, dissolved matter and suspended particulate matter in different locations to be fully mixed, thereby ensuring the uniformity of the sampled water quality.

[0026] Reference Figures 1-3The sampling cylinder 1 has multiple sets of sample storage slots 101 evenly spaced along its axis. Each set of sample storage slots 101 has sampling holes 102 on both sides. A filter membrane is installed in one of the sampling holes 102 of each set of sample storage slots 101. That is, the same set of sample storage slots 101 can collect two kinds of water samples at the same height. A partition 103 is fixedly connected to the middle of each set of sample storage slots 101. The sampling cover 2 has multiple sets of liquid inlet holes 201 spirally raised on both sides. A servo motor 104 is fixedly connected to the top of the sampling cylinder 1. The output end of the servo motor 104 is fixedly connected to the top of the inner cavity of the sampling cover 2. When the sampling cover 2 rotates, the liquid inlet holes 201 at different heights alternately connect with the sampling holes 102 on the same plane.

[0027] With the above-described structure, the servo motor 104 is activated, causing the sampling hood 2 to rotate at the first sampling angle. This connects the two sets of sampling holes 102 in the bottom sample storage tank 101 with the two sets of liquid inlets 201 at the bottom of the sampling hood 2. At this time, the well-stirred old water sample is quickly sucked into the sample storage tank 101. Since a filter membrane is installed in one set of sampling holes 102 in each sample storage tank 101, the original water sample and the filtered water sample are collected simultaneously to meet different subsequent testing needs, thereby improving the sampling effect. Then, the sampling hood 2 is driven to rotate to the second and third sampling angles. The remaining sample storage tank 101 is then used to collect fresh water samples at different heights. After sampling at the third angle, the sampling hood 2 is rotated again to seal all the liquid inlets 201. By using the cooperation of the sampling cylinder 1 and the sampling hood 2, the independent collection and sealed storage of each set of water samples are achieved, avoiding cross-contamination between different water samples and ensuring the accuracy of the final test data.

[0028] Reference Figures 1-3 and Figure 5 One set of support tubes 503 is hollow. The two ends of the hollow cavity of the support tube 503 are connected to the limiting slide groove 501 and the liquid extraction groove 405 respectively. The support tube 503 is equipped with a solenoid valve to control the connection state of the hollow cavity. Multiple sets of liquid guide tubes 506 connected to the limiting slide groove 501 are fixedly connected to the inner arc wall of the positioning ring 5. The output ends of the multiple sets of liquid guide tubes 506 are fixed and connected to the drain pipe 507.

[0029] With the above-described structure, after the old water is used up, the submersible pump 4 is restarted, and the solenoid valves on the output pipe 402 connected to the extraction tank 405 and the support pipe 503 are in the open state (all other solenoid valves are in the closed state). At this time, the submersible pump 4 will extract the old water in the monitoring well and discharge it from the monitoring well through the extraction tank 405, the cavity of the support pipe 503, the limiting slide 501, the guide pipe 506, and the discharge pipe 507. Finally, all the old water in the monitoring well is extracted, realizing well washing before subsequent sampling, promoting the flow of fresh groundwater in the aquifer into the monitoring well, ensuring the representativeness of the sample, and thus truly reflecting the quality status of the groundwater.

[0030] Reference Figure 3 , Figure 4 , Figure 7 and Figure 10 The dynamic balancing component includes a counterweight slider 6. Multiple sets of counterweight grooves 601 are equally spaced along the circumference inside the counterweight base 3. The counterweight slider 6 is slidably connected in the counterweight groove 601. The counterweight groove 601 is inclined towards the central axis of the counterweight base 3. That is, when the counterweight base 3 is placed horizontally, each set of counterweight sliders 6 slides to the end of the counterweight groove 601 near the central axis of the counterweight base 3.

[0031] With the above-described structure, in the initial stage of the counterweight seat 3's rotation, each set of counterweight sliders 6 stays at one end of the counterweight groove 601 near the central axis of the counterweight seat 3. At this time, the moment of inertia is small, and the counterweight seat 3 only requires a small force to start rotating, thereby reducing the starting load and extending the equipment's lifespan. As the rotation speed gradually increases, the centrifugal force generated at this time also increases accordingly, forcing each set of counterweight sliders 6 to slide synchronously towards the other end of the counterweight groove 601. Since the counterweight grooves 601 are arranged at equal intervals along the circumference of the counterweight seat 3, each set of counterweight grooves 601 will also be symmetrically thrown out by the centrifugal force, thereby changing the overall mass distribution of the counterweight seat 3, causing the position of the total center of mass of the entire counterweight seat 3 to change, ensuring that the position of the total center of mass always approaches the rotation central axis, thereby balancing the eccentric load and counteracting the imbalance trend exacerbated by the increase in rotation speed, reducing vibration, and achieving stable rotation of the counterweight seat 3, so as to complete subsequent sampling smoothly and improve the stability of sampling.

[0032] Reference Figure 3 , Figure 4 , Figure 6 and Figure 7The sampling cylinder 1 has a suction groove 7 in the center, and a suction pipe 701 is slidably connected in the suction groove 7. The outer wall of the suction pipe 701 has negative pressure holes 705 that match the number of sample storage slots 101 along its axial direction. Each set of partitions 103 has suction holes 702 on both sides of the top. The counterweight seat 3 has a negative pressure groove 703. The bottom end of the suction pipe 701 passes through the negative pressure groove 703. The inclined bottom ends of each set of counterweight slides 601 are interconnected. The top of the inclined lower ends of two sets of counterweight slides 601 are fixed and connected to a guide pipe 704. The other end of the guide pipe 704 is connected to the inner cavity of the negative pressure groove 703. When the suction pipe 701 slides in the suction groove 7 to the exhaust position, the suction hole 702 is connected to the negative pressure hole 705. The bottom of the inner cavity of the sampling cylinder 1 is provided with a switching groove 8 that communicates with the suction groove 7. A switching plate 801 is slidably connected in the switching groove 8. The inner end of the switching plate 801 is fixedly connected to the outer wall of the suction pipe 701. Multiple sets of switching springs 802 are fixed between the top of the switching plate 801 and the top of the inner cavity of the switching groove 8. A lower trapezoidal block 803 is fixedly connected to the outer end of the switching plate 801. An upper trapezoidal block 804 is fixedly connected to the bottom of the sampling cover 2. The lower trapezoidal block 803 and the upper trapezoidal block 804 are adapted to each other. In the initial state, the upper trapezoidal block 804 is in a squeezing state against the lower trapezoidal block 803, that is, the switching plate 801 is located at the bottom of the switching groove 8. At this time, the suction hole 702 is connected to the negative pressure hole 705, and the switching spring 802 is in a stretched state.

[0033] With the above structure, when the counterweight slider 6 slides away from the center of the counterweight base 3, the cavity of the counterweight slide groove 601 near the center of the counterweight base 3 will increase, thereby generating a corresponding negative pressure. At this time, since each group of air extraction holes 702 and negative pressure holes 705 are in a connected state, the gas in each group of sample storage tanks 101 will be sucked into the counterweight slide groove 601 along the air extraction pipe 701, the negative pressure groove 703 and the air guide pipe 704, so that each group of sample storage tanks 101 is in a negative pressure state, so that the subsequent water flow can be quickly sucked into the sample storage tank 101, avoiding the "air seal" phenomenon, thereby achieving rapid sampling and effectively improving the sampling efficiency.

[0034] Reference Figure 4 , Figure 7 and Figure 10 In addition, a flushing hole 602 is provided at the bottom of the inclined upper end of the counterweight slide 601. When the counterweight slider 6 slides towards its inclined upper end, the gas or liquid remaining in the cavity of the counterweight slide 601 will be vertically discharged into the water body through the flushing hole 602, thereby disturbing the water flow at the bottom of the counterweight seat 3 and achieving a better water mixing effect.

[0035] Example 2: Reference Figures 1-10Similar to Example 1, but based on Example 1, a hydrogeological testing method for environmental monitoring is proposed, including the following steps: Step 1: Place the entire sampling tube 1 into the monitoring well; Step 2: Stir the stagnant water in the monitoring well and collect the mixed stagnant water; Step 3: Drain the stagnant water from the monitoring well and collect fresh water samples at different heights after groundwater re-enters. Step 4: Take out each water sample and perform component analysis separately.

[0036] Reference Figures 1-10 In this invention, when in use, the sampling cylinder 1 is first placed into the monitoring well, and each set of limiting wheels 505 is made to fit against the inner wall of the monitoring well to ensure that the sampling cylinder 1 is located in the center of the monitoring well. Then, the lifting rope 508 is gradually lowered by manual labor, winch or other winding equipment, so that the sampling cylinder 1 enters the water body inside the monitoring well, and then water sample collection is carried out in stages.

[0037] In the first stage, the submersible pump 4 is started, and the solenoid valve on the output pipe 402 connected to the guide channel 401 is in the open state (all other solenoid valves are in the closed state). At this time, the submersible pump 4 will draw the stagnant water in the monitoring well and transport it to the jet channel 403 through the output pipe 402 and the guide channel 401. Then, the water will be discharged along the jet holes 404. At this time, the water will generate a tangential jet effect in the water body, thereby generating a rotational torque, which will cause the entire counterweight 3 to rotate and form a strong rotating vortex in the water body. At this time, the water near the counterweight 3 will generate a tangential jet effect in the water body, thereby generating a rotational torque, which will cause the entire counterweight 3 to rotate and form a strong rotating vortex in the water body. The water flow in area 3 of the counterweight rotates the fastest. According to Bernoulli's principle, a negative pressure zone will be formed here. Under the centrifugal force of the rotating counterweight 3, the water body will be thrown towards the well wall and forced to move downward after hitting the well wall. At the same time, it will carry away the residue attached to the well wall, completing the initial well washing. Then the water flow will flow from the inside of the water body to the bottom of the counterweight 3, thus forming a vertical fluid circulation, i.e., secondary flow. This effectively breaks the stratification of the water body and allows the water flow, dissolved matter and suspended particulate matter in different locations to be fully mixed, thereby ensuring the uniformity of the sampled water quality.

[0038] In addition, during the initial rotation of the counterweight seat 3, each set of counterweight sliders 6 remains at one end of the counterweight groove 601 near the central axis of the counterweight seat 3. At this time, the moment of inertia is small, and the counterweight seat 3 only requires a small force to start rotating, thereby reducing the starting load and extending the equipment life. As the rotation speed gradually increases, the centrifugal force generated at this time also increases accordingly, forcing each set of counterweight sliders 6 to slide synchronously to the other end of the counterweight groove 601. Since the counterweight groove 601 is arranged at equal intervals along the circumference of the counterweight seat 3, each set of counterweight groove 601 will also be symmetrically thrown out by the centrifugal force, thereby changing the overall mass distribution of the counterweight seat 3, so that the position of the total center of mass of the entire counterweight seat 3 changes, ensuring that the position of the total center of mass always approaches the rotation central axis, thereby balancing the eccentric load and counteracting the unbalanced trend exacerbated by the increase in speed, reducing vibration, and realizing the smooth rotation of the counterweight seat 3, so as to complete the subsequent sampling smoothly and improve the sampling stability. Furthermore, when the counterweight slider 6 slides away from the center of the counterweight base 3, the cavity of the counterweight slide groove 601 on the side closer to the center of the counterweight base 3 will increase, thereby generating a corresponding negative pressure effect. At this time, since each group of air extraction holes 702 and negative pressure holes 705 are in a connected state, the gas in each group of sample storage tanks 101 will be sucked into the counterweight slide groove 601 along the air extraction pipe 701, the negative pressure groove 703 and the air guide pipe 704, so that each group of sample storage tanks 101 is in a negative pressure state, so that the subsequent water flow can be quickly sucked into the sample storage tank 101, realizing rapid sampling and improving sampling efficiency.

[0039] In the second stage, when the agitation of the stagnant water is complete, the submersible pump 4 is turned off, and the servo motor 104 is turned on, causing the sampling hood 2 to rotate at the first sampling angle. This connects the two sets of sampling holes 102 in the bottom sample storage tank 101 with the two sets of liquid inlet holes 201 at the bottom of the sampling hood 2. At this time, the agitated stagnant water sample is quickly sucked into the sample storage tank 101. Since a filter membrane is installed in one set of sampling holes 102 in each sample storage tank 101, the original water sample and the filtered water sample are collected simultaneously to meet different subsequent testing needs, thereby improving the sampling effect. Furthermore, when the sampling hood 2 rotates, the upper trapezoidal block 804 will disengage from the lower trapezoidal block 803. At this time, under the rebound action of the switching spring 802, the switching plate 801 drives the suction pipe 701 to move upward, causing the suction hole 702 and the negative pressure hole 705 to switch to a non-connected state, so as to avoid the water samples in each set of sample storage tanks 101 from mixing with each other, thus improving the final sampling accuracy.

[0040] In the third stage, after the old water has been used up, the submersible pump 4 is restarted, and the solenoid valves on the output pipe 402 connected to the extraction tank 405 and the support pipe 503 are in the open state (all other solenoid valves are in the closed state). At this time, the submersible pump 4 will extract the old water in the monitoring well and discharge it from the monitoring well through the extraction tank 405, the cavity of the support pipe 503, the limiting slide 501, the guide pipe 506 and the discharge pipe 507. Finally, all the old water in the monitoring well is extracted, realizing the well washing before subsequent sampling. After the groundwater re-enters the monitoring well, the subsequent sampling of fresh water samples can be carried out.

[0041] In the fourth stage, after fresh groundwater is injected into the monitoring well, the sampling cylinder 1 is adjusted to different heights, and the sampling hood 2 is rotated to the second and third sampling angles. Then, using the remaining sample storage tank 101, fresh water samples are collected from different heights. After sampling at the third angle, the sampling hood 2 is rotated again to seal all inlet holes 201. This cooperation between the sampling cylinder 1 and the sampling hood 2 enables independent collection and sealed storage of each group of water samples, preventing cross-contamination between different samples and ensuring the accuracy of the final test data. Furthermore, as described above, stratified sampling is achieved, accurately capturing water quality information at different depths, providing the most authentic groundwater environmental data, offering a reliable basis for pollution assessment, and thus improving the representativeness of the final test data. It also allows for multiple sampling from a single deployment, significantly reducing on-site operation time and effectively improving sampling efficiency.

[0042] Components not described in detail in this article are existing technologies.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An environmental monitoring hydrogeological testing device, comprising a sampling tube (1), characterized in that, Also includes: The sampling cover (2) is fitted around the outside of the sampling cylinder (1) and can rotate around the sampling cylinder (1) at a preset angle. A counterweight (3) is fixedly connected to the bottom of the sampling cylinder (1), and the counterweight (3) is provided with a drive unit to drive its own rotation. A dynamic balancing assembly is installed inside the counterweight (3) and is used to achieve dynamic balance adjustment when the counterweight (3) rotates. The top of the counterweight (3) is equipped with a limiting part to achieve stable lifting and lowering of the entire sampling cylinder (1) inside the monitoring well; The sampling cylinder (1) has multiple sets of sample storage slots (101) evenly spaced along its axial direction. Each set of sample storage slots (101) has sampling holes (102) on both sides. Each set of sample storage slots (101) has a partition (103) fixedly connected to the middle. The sampling cover (2) has multiple sets of liquid inlet holes (201) spirally raised on both sides. The top of the sampling cylinder (1) is fixedly connected to a servo motor (104). The output end of the servo motor (104) is fixedly connected to the top of the inner cavity of the sampling cover (2). When the sampling cover (2) rotates, the liquid inlet holes (201) at different heights alternately connect with the sampling holes (102) on the same plane. The drive unit includes a submersible pump (4), which is fixedly connected to the hollow cavity of the counterweight (3). The counterweight (3) is symmetrically provided with a guide groove (401) and a liquid extraction groove (405). Two sets of output pipes (402) are symmetrically installed on the submersible pump (4). The other ends of the two sets of output pipes (402) are respectively connected to the guide groove (401) and the liquid extraction groove (405). Solenoid valves are installed on both sets of output pipes (402). The counterweight (3) is provided with a jet groove (403), which is connected to the guide groove (401). Multiple sets of jet holes (404) connected to the jet groove (403) are equally spaced on the outer arc wall of the counterweight (3). The output end of the jet hole (404) is tangential to the outer wall of the counterweight (3), which can generate tangential jet action.

2. The environmental monitoring hydrogeological testing device according to claim 1, characterized in that, The limiting part includes a positioning ring (5), and a limiting groove (501) is opened on the outer arc wall of the positioning ring (5). A rotating ring (502) is rotatably connected in the limiting groove (501). Multiple sets of support tubes (503) are fixed at equal intervals on the top of the counterweight (3). The tops of the multiple sets of support tubes (503) are all fixed on the outer wall of the rotating ring (502). Multiple sets of spring telescopic rods (504) are fixed at equal intervals on the top of the positioning ring (5). The end of each set of spring telescopic rods (504) is rotatably connected to a limiting wheel (505) through a hinge seat. A lifting rope (508) is fixedly connected to the top of the positioning ring (5). When the positioning ring (5) is placed into the monitoring well as a whole, each set of limiting wheels (505) fits against the inner wall of the monitoring well.

3. The environmental monitoring hydrogeological testing device according to claim 2, characterized in that, One of the support tubes (503) is hollow. The two ends of the hollow cavity of the support tube (503) are connected to the limiting slide groove (501) and the liquid extraction groove (405) respectively. The support tube (503) is equipped with a solenoid valve to control the connection state of the hollow cavity. Multiple sets of liquid guide tubes (506) connected to the limiting slide groove (501) are fixedly connected to the inner arc wall of the positioning ring (5). The output ends of the multiple sets of liquid guide tubes (506) are fixed and connected to the drain pipe (507).

4. The environmental monitoring hydrogeological testing device according to claim 1, characterized in that, The dynamic balancing assembly includes a counterweight slider (6). Multiple sets of counterweight grooves (601) are equally spaced along the circumference inside the counterweight seat (3). The counterweight slider (6) is slidably connected in the counterweight groove (601). The counterweight groove (601) is inclined towards the central axis of the counterweight seat (3). A flushing hole (602) is provided at the bottom of the inclined upper end of the counterweight groove (601). When the counterweight seat (3) is placed horizontally, each set of counterweight sliders (6) slides to one end of the counterweight groove (601) near the central axis of the counterweight seat (3).

5. The environmental monitoring hydrogeological testing device according to claim 4, characterized in that, The sampling cylinder (1) has a suction groove (7) in the center, and a suction pipe (701) is slidably connected in the suction groove (7). The suction pipe (701) has negative pressure holes (705) on its outer wall along its axis, which are matched with the number of sample storage slots (101). Each set of partitions (103) has suction holes (702) on both sides of its top. The counterweight base (3) has a negative pressure groove (703). The bottom end of the suction pipe (701) extends into the negative pressure groove (703). The inclined bottom ends of each set of counterweight slides (601) are interconnected. The top of the inclined lower ends of two sets of counterweight slides (601) are fixed and connected to a guide pipe (704). The other end of the guide pipe (704) is connected to the inner cavity of the negative pressure groove (703). When the suction pipe (701) slides to the exhaust position in the suction groove (7), the suction hole (702) is connected to the negative pressure hole (705).

6. The environmental monitoring hydrogeological testing device according to claim 5, characterized in that, The sampling tube (1) has a switching groove (8) at the bottom of its inner cavity that communicates with the suction groove (7). A switching plate (801) is slidably connected in the switching groove (8). The inner end of the switching plate (801) is fixedly connected to the outer wall of the suction pipe (701). Multiple sets of switching springs (802) are fixed between the top of the switching plate (801) and the top of the inner cavity of the switching groove (8). A lower trapezoidal block (803) is fixedly connected to the outer end of the switching plate (801). An upper trapezoidal block (804) is fixedly connected to the bottom of the sampling cover (2). The lower trapezoidal block (803) and the upper trapezoidal block (804) are compatible with each other. In the initial state, the upper trapezoidal block (804) is in a state of compression on the lower trapezoidal block (803), that is, the switching plate (801) is located at the bottom of the switching groove (8), and at this time the air extraction hole (702) is connected to the negative pressure hole (705).

7. The environmental monitoring hydrogeological testing device according to claim 1, characterized in that, Each of the sample storage tanks (101) has a filter membrane installed in one of the sampling holes (102), meaning that the same set of sample storage tanks (101) can collect two types of water samples at the same height.

8. A method for environmental monitoring hydrogeological testing, employing an environmental monitoring hydrogeological testing device as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Place the entire sampling tube (1) into the monitoring well; Step 2: Stir the stagnant water in the monitoring well and collect the mixed stagnant water; Step 3: Drain the stagnant water from the monitoring well and collect fresh water samples at different heights after groundwater re-enters. Step 4: Take out each water sample and perform component analysis separately.

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