A groundwater sampling device and a control method thereof

Abstract

The application relates to the technical field of groundwater sampling, and discloses a groundwater sampling device which comprises a frame body, a sampling cylinder, a sampling drum and a cleaning drum rotatably connected to the frame body, a sampling cavity is arranged in the sampling drum, a sampling hose is connected to the sampling cavity, a first detection sensor group is arranged on the sampling cylinder, a lower valve cylinder driven by a motor a is rotatably arranged on the inner wall of the sampling cylinder, a lower valve hole is arranged in the lower valve cylinder, the sampling end of the sampling hose and the lower valve hole are both communicated with the inner cavity of the lower valve cylinder, an upper branch pipe which is adapted to the lower valve hole is arranged on the side of the sampling cylinder, a rotary sampling head is arranged at the lower part of the sampling cylinder, and a rotary flow guide part is arranged between the rotary sampling head and the upper branch pipe. The device is integrated with a high-pressure air pump, a cleaning pump and a sewage suction pump, and the intelligent switching control of the tee joint and the electromagnetic valve is combined, so that the automatic backwashing of the sampling hose, the rotary sampling head and the flow channel is realized.

Description

Technical Field

[0001] This invention relates to the field of groundwater sampling technology, and more specifically, to a groundwater sampling device and its control method. Background Technology

[0002] In hydrogeological exploration and groundwater environment monitoring, it is necessary to sample groundwater in different regions in order to observe the water quality in each region.

[0003] In the prior art, patent document CN116659963B discloses a groundwater sampling device, including a fixed frame. A first winding seat is fixed to one side of the top of the fixed frame, and a second winding seat is installed on the other side of the top of the fixed frame. A first traction rope is wound around the surface of the first winding seat, and a second traction rope is wound around the surface of the second winding seat. The above device protects the water pump with an anti-collision shell and blocks larger impurities in the water to prevent clogging of the water pump inlet. However, the above device has the following technical problems in use:

[0004] Existing devices lack an efficient backwashing system, and residual water or sediment after sampling can easily remain in the hose and sampling head, leading to cross-contamination of subsequent samples. Especially in continuous sampling scenarios, manual cleaning is inefficient and difficult to thoroughly clean the flow channel. Traditional fixed sampling heads cannot rotate actively, resulting in low sampling efficiency and easy clogging, leading to insufficient sample representativeness. Existing devices require manual switching between storage containers and detection equipment, which cannot achieve automated dispensing and online detection, resulting in poor data timeliness and the risk of human operation error.

[0005] Based on this, the present invention provides a groundwater sampling device and its control method to solve the technical problems mentioned in the background art. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a groundwater sampling device and its control method. The present invention integrates a high-pressure air pump, a cleaning pump and a sludge suction pump, and combines a three-way connector and a solenoid valve for intelligent switching control, thereby realizing automated backwashing of the sampling hose, the rotating sampling head and the flow channel.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a groundwater sampling device, including a frame, a sampling cylinder, a sampling roll and a cleaning roll rotatably connected to the frame;

[0008] A sampling chamber is provided inside the sampling cylinder, and a sampling hose is connected to the sampling chamber. A first detection sensor group is installed on the sampling cylinder. A lower valve cylinder driven by a motor a is rotatably installed on the inner wall of the sampling cylinder. A lower valve hole is provided on the lower valve cylinder. The sampling end of the sampling hose and the lower valve hole are both connected to the inner cavity of the lower valve cylinder. An upper branch pipe adapted to and connected to the lower valve hole is provided on the side of the sampling cylinder. A rotating sampling head is provided at the bottom of the sampling cylinder. A rotating guide component is provided between the rotating sampling head and the upper branch pipe.

[0009] The cleaning drum is equipped with a backwashing component for backwashing the upper branch pipe and sampling hose. A vacuum pump and a sample outlet cylinder are installed on the frame. The negative pressure end of the vacuum pump is connected to the sampling chamber. An upper valve cylinder driven by motor b is rotatably installed inside the sample outlet cylinder. An upper valve hole is opened in the upper valve cylinder. The upper valve hole and the sampling chamber are both connected to the inner cavity of the upper valve cylinder. The backwashing component draws the cleaning waste liquid through the negative pressure of the upper valve hole. A collection pipe is connected to the sample outlet cylinder. A sample collection and detection component connected to the collection pipe is provided on the frame.

[0010] As a preferred embodiment of the present invention, a microcontroller, an audible and visual alarm, and two motors c are respectively installed on the frame. The sampling roll and the cleaning roll are driven by the two motors c respectively. A pressure probe is provided at the connection between the vacuum pump and the sampling chamber. The data terminals of the pressure probe and the audible and visual alarm are both connected to the microcontroller.

[0011] As a preferred embodiment of the present invention, the first detection sensor group includes an inclination sensor, a GPS positioning sensor, a triaxial acceleration sensor and a first water quality sensor installed on the sampling tube, and the data terminals of the inclination sensor, the GPS positioning sensor, the triaxial acceleration sensor and the first water quality sensor are all connected to the microcontroller.

[0012] As a preferred embodiment of the present invention, the rotating guide component includes a hydrodynamic chamber located inside the sampling cylinder. The other end of the upper branch pipe is connected to the hydrodynamic chamber. A hydrodynamic shaft is rotatably mounted inside the hydrodynamic chamber. A set of hydrodynamic blades arranged in a circular array are mounted on the hydrodynamic shaft. The bottom end of the hydrodynamic shaft is fixedly connected to the rotating sampling head. A lower branch pipe is connected to the upper part of the hydrodynamic chamber. The other end of the lower branch pipe is connected to a flow collecting ring. The inner cavity of the flow collecting ring is rotatably connected to the inner cavity of the rotating sampling head. The rotating sampling head is inclined downwards, and the angle between the axis of the opening end of the rotating sampling head and the horizontal plane is 45°.

[0013] As a preferred embodiment of the present invention, the backwashing component includes a flushing chamber located inside the cleaning drum, a high-pressure air pump mounted on a frame, a cleaning box, and a suction box. A three-way connector is rotatably connected to the top of the flushing chamber. A first cleaning pump is mounted on the cleaning box. The air outlet of the high-pressure air pump and the liquid outlet of the first cleaning pump are both connected to the three-way connector. A first solenoid valve is provided at the connection points between the high-pressure air pump, the first cleaning pump, and the three-way connector. A backwashing pipe is wound on the cleaning drum. The tail end of the backwashing pipe is connected to the flushing chamber, and the other end of the backwashing pipe is fixedly connected to the sampling cylinder and adapted to the lower valve port. A suction pump is mounted on the suction box. The negative pressure end of the suction pump is connected to the sampling cylinder through a negative pressure suction pipe, which is adapted to the upper valve port.

[0014] As a preferred embodiment of the present invention, it further includes a one-way discharge pipe connected to the backwash pipe, the other end of the one-way discharge pipe being fixedly connected to the upper branch pipe, and a second solenoid valve and a one-way discharge valve being installed inside the one-way discharge pipe respectively.

[0015] As a preferred embodiment of the present invention, the sample collection and detection assembly includes a sealing seat mounted on a frame, the other end of the collection tube being fixedly connected to the sealing seat, a conversion slide being slidably mounted on the inner wall of the sealing seat, a linear transmission module being mounted on the sealing seat, the linear transmission module being kinetically connected to the conversion slide, a set of threaded joints being connected to the conversion slide, one of the threaded joints being threadedly connected to a detection tube, the detection tube being mounted with a second detection sensor group, and the other threaded joints being threadedly mounted with sample storage cylinders, a second cleaning pump being mounted on the cleaning tank, the second cleaning pump being connected to a cleaning tube, and the cleaning tube being adapted and connected to the detection tube.

[0016] As a preferred embodiment of the present invention, the second detection sensor group includes a second water quality sensor and a temperature sensor installed on the detection tube, and the data terminals of the second water quality sensor and the temperature sensor are both connected to the microcontroller.

[0017] As a preferred embodiment of the present invention, the axis of the upper valve hole is perpendicular to the axis of the upper valve cylinder, the axis of the lower valve hole is perpendicular to the axis of the lower valve cylinder, and the axes of the sampling drum and the cleaning drum are both perpendicular to the horizontal plane.

[0018] A method for controlling a groundwater sampling device includes the following steps:

[0019] The microcontroller uses data from GPS positioning sensors and triaxial accelerometers to fuse positioning information through a Kalman filter algorithm, calculates the device's attitude deviation angle θ, and dynamically adjusts the speed of motor c.

[0020] The microcontroller drives the sampling reel to release the sampling hose, while the tilt sensor corrects the attitude in real time to ensure that the sampling reel is inserted vertically into the groundwater layer;

[0021] A vacuum pump power regulation model is established based on the real-time pressure data P(t) (kPa) from the pressure probe.

[0022] Adjust the rotation speed ω (rpm) of the rotating sampling head based on the turbidity C (NTU) detected by the first water quality sensor.

[0023] The microcontroller constructs a multidimensional feature vector X=[θ,ax,ay,az,C] using the tilt angle, acceleration, and water quality data collected by the first detection sensor group, and inputs it into the support vector machine (SVM) model for anomaly classification;

[0024] The linear drive module dynamically distributes samples to the sample storage cylinder based on the real-time water quality data from the detection tube;

[0025] Based on the historical residual amount of sewage M (g), the switching cycle T (s) between the high-pressure air pump and the cleaning pump is dynamically adjusted.

[0026] The change in turbidity in the pipeline after backwashing is detected by a second water quality sensor. If the turbidity does not meet the standard, iterative cleaning is triggered until C ≤ C standard.

[0027] The formula for calculating the attitude deviation angle θ is as follows:

[0028] ;

[0029] Parameter explanation:

[0030] n: Target speed of motor c (rpm);

[0031] L: Target sampling depth (m);

[0032] v: Release velocity of the sampling tubing (m / s);

[0033] k1, k2: Dynamic correction coefficients;

[0034] The power regulation model is as follows:

[0035] ;

[0036] Parameter explanation:

[0037] W(t): Instantaneous power of the vacuum pump (W);

[0038] Base power;

[0039] PID control parameters;

[0040] Target negative pressure value;

[0041] The formula for adjusting the rotational speed ω (rpm) of the rotating sampling head is as follows:

[0042] ;

[0043] Parameter explanation:

[0044] ωbase: Base rotational speed;

[0045] γ: Turbidity influencing factor;

[0046] The formula for calculating the dynamic distribution flow rate of the sample storage cylinder is as follows:

[0047] ;

[0048] Parameter explanation:

[0049] : Sample storage tube (40) distribution flow rate (L / min);

[0050] Total sample flow rate (L / min);

[0051] Logistic function parameters;

[0052] The formula for the switching period T(s) is as follows:

[0053] ;

[0054] Parameter explanation:

[0055] Basic cleaning cycle;

[0056] δ: Residual amount correction factor;

[0057] : Threshold for residual wastewater.

[0058] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0059] 1. This invention integrates a high-pressure air pump, a cleaning pump, and a sludge suction pump, combined with intelligent switching control of a three-way connector and a solenoid valve, to achieve automated backwashing of the sampling hose, rotating sampling head, and flow channel. The cleaning fluid and compressed air are alternately injected into the backwash pipe to flush away residual water samples and sediments. The sludge is then sucked into the sludge suction box for centralized treatment via a negative pressure suction pipe. Compared with the traditional manual cleaning method, this design solves the problem of sample cross-contamination caused by residues in continuous sampling scenarios.

[0060] 2. This invention converts the kinetic energy of groundwater into mechanical energy through the hydrodynamic blades in the hydrodynamic chamber, driving the rotating sampling head to actively rotate at a 45° tilt angle. This passive driving structure overcomes the limitations of traditional fixed sampling heads, such as easy clogging and insufficient penetration, thus improving sampling efficiency. The rotational motion continuously disturbs the sedimentary layer. Combined with the optimized flow channel design of the collection ring and the lower branch pipe, it ensures uniform collection of water samples from multiple directions, significantly improving the representativeness of the samples. It is especially suitable for complex geological environments with high viscosity or high sand content.

[0061] 3. In this invention, the sample collection and detection component drives the conversion slide through a linear transmission module to achieve intelligent switching of the sample between the detection tube and the storage tube. The second water quality sensor and temperature sensor analyze the key parameters of the sample online, and the data is synchronized to the microcontroller in real time. At the same time, the storage tube is sealed to preserve the sample for laboratory retesting. Compared with the traditional manual switching mode, this design shortens the detection response time to the second level, eliminates human operation error, and supports customized configuration of multi-capacity storage tubes to meet the continuous sampling needs of different scenarios.

[0062] 4. This invention integrates GPS positioning, tilt sensor, triaxial accelerometer, and dual-stage water quality sensor to monitor the geographical coordinates of sampling points, device attitude, water flow status, and water quality parameters in real time. The microcontroller dynamically adjusts the vacuum pump power through the air pressure probe and triggers an audible and visual alarm in case of abnormality. This multi-dimensional data fusion technology solves the problem of sample distortion caused by positioning deviation and attitude loss of traditional devices, ensuring precise control of sampling depth and angle, and providing a guarantee for data reliability in complex environments.

[0063] 5. This invention achieves precise positioning and adaptive negative pressure adjustment of the sampling device through the synergistic application of the Kalman filter algorithm and the dynamic PID model. The sampling depth error is less than 0.5%, and the verticality deviation is controlled within 1°, ensuring the representativeness of the groundwater samples. The rotational speed of the sampling head is dynamically optimized according to turbidity (e.g., the speed is increased to 90 rpm in high turbidity environments). Combined with the SVM anomaly early warning model based on multi-dimensional data fusion (response time < 2 seconds), the sampling efficiency (increased by 35%) and reliability (success rate > 95%) in complex geological environments are significantly improved, effectively solving the problems of attitude loss and high risk of blockage in traditional devices.

[0064] 6. This invention optimizes the sample dispensing strategy through a nonlinear allocation function, reducing the storage volume of highly contaminated samples by 40% while improving the timeliness of detection data to the second level, meeting the needs of real-time monitoring. The backwashing process incorporates a gas-liquid collaborative model to dynamically adjust the cleaning cycle (e.g., extending the cycle by 50% when the residual contaminant exceeds the threshold). Combined with a post-cleaning turbidity verification mechanism, the pipeline cleanliness compliance rate is >98%, and cleaning fluid consumption is reduced by 25%. The overall solution increases the automation rate of the entire process to over 90%, combining high precision, low energy consumption, and environmental friendliness, making it suitable for high-standard environmental monitoring and long-term continuous sampling scenarios.

[0065] 7. This invention uses GPS positioning and water quality sensors to automatically record the coordinates of sampling points, automatically record water quality parameters during well washing, and automatically notify users of successful well washing.

[0066] 8. The present invention can also adjust the outflow rate to meet the requirements for well washing and sampling of volatile organic compounds;

[0067] 9. This invention enables sampling at a fixed depth in groundwater by extending and retracting a sampling hose. Attached Figure Description

[0068] Figure 1 This is a schematic diagram of the structure of a groundwater sampling device according to the present invention;

[0069] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;

[0070] Figure 3 For the present invention Figure 1 A structural diagram from another perspective;

[0071] Figure 4 For the present invention Figure 3 A schematic diagram of the structure from the rear-view perspective;

[0072] Figure 5 For the present invention Figure 4 A schematic diagram of the cross-sectional structure;

[0073] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the local structure at point B;

[0074] Figure 7 This is a schematic cross-sectional view of the hydraulic shaft and lower valve cylinder of the present invention.

[0075] Figure 8 This is a schematic diagram of the structure of the cleaning tube and the collection tube of the present invention;

[0076] Figure 9 This is a schematic cross-sectional view of the conversion slide of the present invention;

[0077] Figure 10 This is a flowchart of the control method of the present invention;

[0078] Figure 11 This is a schematic diagram of the control principle of the present invention.

[0079] In the diagram: 1. Frame; 2. Sampling reel; 3. Cleaning reel; 4. Sampling chamber; 5. Sampling hose; 6. Sampling tube; 7. Lower valve tube; 8. Motor a; 9. Lower valve port; 10. Upper branch pipe; 11. Rotary sampling head; 12. Vacuum pump; 13. Sampling tube; 14. Motor b; 15. Upper valve tube; 16. Upper valve port; 17. Collection tube; 18. Microcontroller; 19. Audible and visual alarm; 20. Motor c; 21. Air pressure probe; 22. Hydraulic shaft ; 24. Hydrodynamic blades; 25. Lower branch pipe; 26. Collector ring; 27. Flushing chamber; 28. High-pressure air pump; 29. ​​Cleaning tank; 30. Sludge suction tank; 31. Backwash pipe; 32. Negative pressure suction pipe; 33. One-way liquid outlet pipe; 34. Sealing seat; 35. Converter slide; 36. Linear drive module; 37. Threaded connector; 38. Detection tube; 39. Second detection sensor group; 40. Sample storage cylinder; 41. Cleaning tube; 42. First detection sensor group. Detailed Implementation

[0080] 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.

[0081] Example 1

[0082] like Figures 1 to 9 As shown, the present invention provides a groundwater sampling device, including a frame 1, a sampling cylinder 6, a sampling roll 2 rotatably connected to the frame 1, and a cleaning roll 3;

[0083] The axes of both the sampling roll 2 and the cleaning roll 3 are perpendicular to the horizontal plane;

[0084] The frame 1 is equipped with a microcontroller 18, an audible and visual alarm 19 and two motors c20. The sampling roll 2 and the cleaning roll 3 are driven by the two motors c20 respectively.

[0085] Through the coordinated control of the microcontroller 18 and the audible and visual alarm 19, the intelligent operation of the device is realized. In the workflow, the motor C20 drives the sampling drum 2 and the cleaning drum 3 to rotate according to a preset program. The air pressure probe 21 monitors the negative pressure status in the sampling chamber 4 in real time and transmits the data to the microcontroller 18. If the negative pressure is abnormal, such as leakage or blockage, the microcontroller 18 immediately triggers the audible and visual alarm 19 to alert the operator to intervene. This design solves the problem of sampling failure or data distortion caused by the lag in manual monitoring in traditional sampling devices, significantly improving the reliability and response speed of the system. At the same time, the dual motors C20 independently drive the sampling and cleaning functions, avoiding mechanical interference and ensuring efficient separation of the sampling and cleaning processes, further optimizing the operation efficiency.

[0086] A sampling chamber 4 is provided inside the sampling roll 2, and a sampling hose 5 is connected to the sampling chamber 4. A first detection sensor group 42 is installed on the sampling roll 6.

[0087] The first sensor group 42 includes an inclination sensor, a GPS positioning sensor, a triaxial accelerometer, and a first water quality sensor, all mounted on the sampling cylinder 6. The data terminals of the inclination sensor, GPS positioning sensor, triaxial accelerometer, and first water quality sensor are all connected to the microcontroller 18.

[0088] By integrating an inclination sensor, a GPS positioning sensor, a triaxial accelerometer, and a first water quality sensor, comprehensive monitoring and data acquisition of the sampling process are achieved. During the workflow, the GPS positioning sensor accurately records the geographical coordinates of the sampling point, while the inclination sensor and the triaxial accelerometer monitor the attitude and vibration state of the sampling tube 6 in real time to ensure that the sampling tube 6 is always inserted vertically into the groundwater layer, avoiding sample contamination or insufficient collection due to device tilt. The first water quality sensor analyzes the basic parameters of the water body in real time during the sampling process, determines whether the well washing meets the standards, and provides prompts. At the same time, it provides preliminary data support for subsequent laboratory testing. This multi-sensor fusion design solves the problems of inaccurate positioning, attitude loss, and single data in traditional devices.

[0089] During sampling, the tilt angle and sampling posture of the sampling tube 6 can be limited by controlling the winding and unwinding of the sampling hose 5 and the backwash tube 31, and at the same time, sampling at a fixed depth can be achieved.

[0090] The inner wall of the sampling tube 6 is rotatably mounted with a lower valve tube 7 driven by a motor a8. A lower valve hole 9 is provided on the lower valve tube 7. The axis of the lower valve hole 9 is perpendicular to the axis of the lower valve tube 7. The sampling end of the sampling hose 5 and the lower valve hole 9 are both connected to the inner cavity of the lower valve tube 7. An upper branch pipe 10 is provided on the side of the sampling tube 6 and is adapted to communicate with the lower valve hole 9. A rotating sampling head 11 is provided at the bottom of the sampling tube 6. A rotating guide component is provided between the rotating sampling head 11 and the upper branch pipe 10.

[0091] The rotating guide component includes a hydrodynamic chamber inside the sampling tube 6. The other end of the upper branch pipe 10 is connected to the hydrodynamic chamber. A hydrodynamic shaft 22 is rotatably installed inside the hydrodynamic chamber. A set of hydrodynamic blades 24 arranged in a circular array are installed on the hydrodynamic shaft 22. The bottom end of the hydrodynamic shaft 22 is fixedly connected to the rotating sampling head 11. A lower branch pipe 25 is connected to the upper part of the hydrodynamic chamber. The other end of the lower branch pipe 25 is connected to a flow collecting ring 26. The inner cavity of the flow collecting ring 26 is rotatably connected to the inner cavity of the rotating sampling head 11. The rotating sampling head 11 is inclined downward and the angle between the axis of the opening end of the rotating sampling head 11 and the horizontal plane is 45°.

[0092] During sampling, the vacuum pump 12 drives the sampling chamber 4 to generate negative pressure. After negative pressure is generated in the sampling chamber 4, the groundwater to be sampled enters the lower branch pipe 25, the hydrodynamic chamber, the upper branch pipe 10, the inner cavity of the lower valve cylinder 7 and the sampling hose 5 through the rotating sampling head 11. When the groundwater is transported to the sampling chamber, the hydrodynamic blades 24 in the hydrodynamic chamber convert the kinetic energy of the groundwater into mechanical energy under the action of water flow, driving the rotating sampling head 11 to rotate actively. This design uses water flow power to achieve passive drive, which reduces external energy consumption and enhances the penetration of the sampling head into sediments. It is especially suitable for groundwater environments with high viscosity or high sand content. The connection design between the collection ring 26 and the lower branch pipe 25 further optimizes the flow channel sealing and prevents sample leakage. Compared with the traditional fixed sampling head, this scheme significantly improves sampling efficiency and adaptability.

[0093] The tilted opening of the rotating sampling head 11 forms a dynamic angle with the direction of water flow. During rotation, it guides the water flow to spiral upward along the inner wall of the rotating sampling head 11, accelerating the convergence of the water sample towards the collection ring 26. At the same time, the tilt angle of the rotating sampling head 11 can reduce the deposition of sediment at the opening. Combined with the rotation action, it continuously disturbs the surrounding sediment, reducing the risk of blockage at the sampling port of the rotating sampling head 11. The rotating structure of the rotating sampling head 11 ensures that the groundwater sample is drawn in uniformly from multiple directions, avoiding local water body sampling deviations caused by a fixed angle, thereby improving the representativeness and accuracy of the sampled water.

[0094] Meanwhile, the action of the hydrodynamic blades 24 promotes thorough mixing of the sampled water in the hydrodynamic chamber, reduces sample stratification errors caused by differences in flow velocity, and ensures the spatiotemporal representativeness of the collected water samples.

[0095] The cleaning drum 3 is equipped with a backwashing component for backwashing the upper branch pipe 10 and the sampling hose 5.

[0096] A vacuum pump 12 and a sample outlet cylinder 13 are respectively installed on the frame 1. The negative pressure end of the vacuum pump 12 is connected to the sampling chamber 4. A pressure probe 21 is installed at the connection between the vacuum pump 12 and the sampling chamber 4. The data terminals of the pressure probe 21 and the audible and visual alarm 19 are both connected to the microcontroller 18.

[0097] An upper valve cylinder 15 driven by a motor b14 is rotatably installed inside the sample outlet cylinder 13. An upper valve hole 16 is opened inside the upper valve cylinder 15. The axis of the upper valve hole 16 is perpendicular to the axis of the upper valve cylinder 15. The upper valve hole 16 and the sampling chamber 4 are both connected to the inner cavity of the upper valve cylinder 15. The backwashing component draws the cleaning liquid through the negative pressure of the upper valve hole 16. A collection pipe 17 is connected to the sample outlet cylinder 13. The frame 1 is equipped with a sample collection and detection component connected to the collection pipe 17.

[0098] The backwashing component achieves dual cleaning of the sampling hose 5 and the upper branch pipe 10 through the alternating operation of the high-pressure air pump 28 and the cleaning pump. During the process, the high-pressure air pump 28 injects compressed gas into the backwash pipe 31 through the three-way connector to flush away residual dirt in the pipe. At the same time, the first cleaning pump injects cleaning fluid to dissolve stubborn deposits, and the suction pump draws the cleaned sewage into the suction box 30 for centralized treatment through the negative pressure suction pipe 32. This design solves the problems of low efficiency and easy cross-contamination of manual cleaning of traditional sampling devices. It is especially suitable for long-term continuous sampling scenarios. The intelligent switching of air-liquid cleaning mode by the solenoid valve saves resources and ensures that the pipeline is thoroughly cleaned, thus extending the service life of the device.

[0099] The backwashing components include a flushing chamber 27 located inside the cleaning drum 3, a high-pressure air pump 28 mounted on the frame 1, a cleaning tank 29, and a suction tank 30. The top of the flushing chamber 27 is rotatably connected to a three-way connector. A first cleaning pump is mounted on the cleaning tank 29. The air outlet of the high-pressure air pump 28 and the liquid outlet of the first cleaning pump are both connected to the three-way connector. A first solenoid valve is provided at the connection points between the high-pressure air pump 28, the first cleaning pump, and the three-way connector. A backwashing pipe 31 is wound on the cleaning drum 3. The tail end of the backwashing pipe 31 is connected to the flushing chamber 27. The other end of the backwashing pipe 31 is fixedly connected to the sampling cylinder 6 and is adapted to the lower valve hole 9. A suction pump is mounted on the suction tank 30. The negative pressure end of the suction pump is connected to the sampling cylinder 13 through a negative pressure suction pipe 32. The negative pressure suction pipe 32 is adapted to the upper valve hole 16.

[0100] It also includes a one-way discharge pipe 33 connected to the backwash pipe 31. The other end of the one-way discharge pipe 33 is fixedly connected to the upper branch pipe 10. A second solenoid valve and a one-way discharge valve are installed inside the one-way discharge pipe 33.

[0101] The one-way liquid outlet pipe 33, in conjunction with the second solenoid valve and the one-way liquid outlet valve, realizes the one-way controllable flow of the cleaning liquid. During backwashing, the second solenoid valve is opened, the lower valve hole 9 is connected to the backwash pipe 31, and the upper valve hole 16 is connected to the suction pump. The cleaning liquid and the clean airflow act on the sampling hose 5, the water chamber and the rotating sampling head 11, thereby realizing online backwashing after sampling by the sampling mechanism and reducing the cross-contamination rate of the sampled water during sampling.

[0102] The sample collection and detection assembly includes a sealing seat 34 installed on the frame 1. The other end of the collection tube 17 is fixedly connected to the sealing seat 34. A conversion slide 35 is slidably installed on the inner wall of the sealing seat 34. A linear drive module 36 is installed on the sealing seat 34. The linear drive module 36 is connected to the conversion slide 35. A set of threaded joints 37 are connected to the conversion slide 35. One of the threaded joints 37 is threadedly connected to a detection tube 38. A second detection sensor group 39 is installed on the detection tube 38. Sample storage cylinders 40 are threadedly installed on the other threaded joints 37. A second cleaning pump is installed on the cleaning tank 29. A cleaning tube 41 is connected to the second cleaning pump. The cleaning tube 41 is adapted to and connected to the detection tube 38.

[0103] The second detection sensor group 39 includes a second water quality sensor and a temperature sensor installed on the detection tube 38. The data terminals of the second water quality sensor and the temperature sensor are both connected to the microcontroller 18.

[0104] The sample collection and detection component drives the conversion slide 35 via the linear transmission module 36, enabling seamless switching between automatic sample dispensing and real-time detection. In the workflow, the collection tube 17 delivers the sample to the sealing seat 34, and the linear transmission module 36 pushes the conversion slide 35 to move laterally, connecting the detection tube 38 or the sample storage cylinder 40 with the collection tube. The second water quality sensor and temperature sensor built into the detection tube 38 can analyze key parameters of the sample online, and the data is uploaded to the microcontroller 18 in real time. The sample storage cylinder 40 is used to preserve the sample for a long time. Each sample storage cylinder 40 has a different storage capacity, and the liquid storage capacity of each sample storage cylinder 40 can be customized according to the viewing requirements. The cleaning tube 41 can quickly rinse the detection tube 38 after detection to avoid residue affecting subsequent detection. This design solves the problems of traditional devices requiring manual switching of containers and low detection efficiency, and significantly improves the automation of the sampling process and the timeliness of data.

[0105] The second detection sensor group 39 achieves high-precision analysis of the physicochemical properties of the sample through the coordinated work of the second water quality sensor and the temperature sensor. During the workflow, when the sample flows through the detection tube 38, the temperature sensor monitors the water temperature change in real time, and the second water quality sensor simultaneously detects key indicators such as dissolved oxygen and turbidity. The data is processed by the microcontroller 18 to generate a comprehensive report. This design makes up for the lag of traditional devices that rely solely on laboratory analysis, providing a reliable basis for rapid on-site decision-making. At the same time, the direct data link between the sensor and the microcontroller 18 avoids errors from manual recording and ensures the authenticity and traceability of the data.

[0106] Working principle and usage process of this invention:

[0107] After the device is started, the microcontroller 18 controls the motor c20 to drive the sampling reel 2 to release the sampling hose 5. At the same time, the vacuum pump 12 establishes negative pressure in the sampling chamber 4. Groundwater enters the system through the downward-tilted rotating sampling head 11 at 45°. The water flows through the collection ring 26 and the lower branch pipe 25 into the hydrodynamic chamber, driving the hydrodynamic blades 24 to drive the rotating sampling head 11 to actively rotate to penetrate the sediment layer. The water sample then enters the inner cavity of the lower valve cylinder 7 through the upper branch pipe 10. Under the action of negative pressure, it enters the sampling chamber 4 for temporary storage along the sampling hose 5. During the sampling process, the first detection sensor group 42 collects GPS positioning, device tilt angle, acceleration, and water quality parameters in real time. The data is synchronously transmitted to the microcontroller 18. After the sampling is completed, the motor b14 drives the upper valve cylinder 15 to rotate. The upper valve port 16 is connected to the sampling chamber 4, and the water sample is transported to the discharge assembly through the collection pipe 17. At the same time, the backwashing component is started, and the high-pressure air pump 28 and the first cleaning pump alternately inject compressed air and cleaning fluid into the backwash pipe 31 through the three-way connector, backwashing the sampling hose 5, the water chamber and the rotating sampling head 11. The sewage is pumped to the suction box 30 through the upper valve port 16 by the suction pump. During the discharge stage, the linear transmission module 36 drives the conversion slide 35 to switch the path. The water sample can be selected to enter the detection tube 38 for real-time analysis by the second water quality sensor and the temperature sensor, or diverted to the sample storage cylinder 40 for sealed storage. After the detection is completed, the second cleaning pump flushes the detection tube 38, completing the fully automated sampling, cleaning and data acquisition process.

[0108] The specific control principle of the above-mentioned groundwater sampling device is as follows:

[0109] SS01, Start-up and positioning: Fix the frame 1 to the sampling point, confirm the geographical coordinates through the GPS positioning sensor, and control the motor c20 to drive the sampling reel 2 to release the sampling hose 5 to the preset depth.

[0110] SS02, negative pressure sampling: start vacuum pump 12 to establish negative pressure in sampling chamber 4. Groundwater enters the system through rotating sampling head 11. Water flows through collection ring 26 and lower branch pipe 25 into water-moving chamber, driving water-moving blade 24 to rotate rotating sampling head 11. Water sample enters the inner cavity of lower valve cylinder 7 through upper branch pipe 10 and enters sampling chamber 4 along sampling hose 5.

[0111] SS03, Data Acquisition and Monitoring: The first detection sensor group 42 collects GPS positioning, tilt angle, triaxial acceleration and water quality parameters in real time. The data is synchronously transmitted to the microcontroller 18. If the air pressure probe 21 detects an abnormal negative pressure, the microcontroller 18 triggers the audible and visual alarm 19 to sound an alarm.

[0112] SS04, Sample Discharge and Detection: After sampling, motor b14 drives the upper valve cylinder 15 to rotate, connecting the upper valve port 16 with the sampling chamber 4. The water sample is then transported through the collection pipe 17 to the discharge collection and detection assembly. The linear transmission module 36 drives the conversion slide 35 to switch the path.

[0113] SS05, Real-time detection: The sample enters the detection tube 38, and the second water quality sensor and temperature sensor analyze the data online.

[0114] SS06. Sample preservation: The sample is diverted to a sample storage cylinder and sealed for preservation.

[0115] SS07, backwashing: Start the high-pressure air pump 28 and the first cleaning pump, and alternately inject compressed air and cleaning fluid into the backwash pipe 31 through the three-way connector. The cleaning fluid backwashes the sampling hose 5, the water chamber and the rotating sampling head 11. The sewage is pumped to the sewage tank 30 by the sewage pump through the upper valve hole 16. The second cleaning pump rinses the detection tube 38 through the cleaning pipe 41.

[0116] Example 2

[0117] For organic sampling, in accordance with the "Technical Guidelines for Sampling Volatile Organic Compounds in Soil and Groundwater of Sites" (HJ1019-2019), the following requirements apply: "The outflow rate should generally not exceed 100 ml / min; when the actual situation does not meet the above conditions, the outflow rate may be appropriately increased, but it shall not exceed 500 ml / min; the outflow rate should be reduced as much as possible" to minimize the loss of volatile organic compounds and the disturbance of the sample.

[0118] To ensure data reliability in complex environments, this embodiment also provides a control method for a groundwater sampling device. Based on the device described above, and incorporating intelligent control algorithms and dynamic optimization models, the usage method is further expanded, such as... Figure 10 and Figure 11 As shown, the specific steps are as follows:

[0119] Step 1: Startup and Adaptive Positioning

[0120] Control logic: Based on the data from the GPS positioning sensor and the triaxial accelerometer, the microcontroller 18 fuses the positioning information using a Kalman filter algorithm, calculates the device attitude deviation angle θ (unit: °), and dynamically adjusts the speed of motor c (20):

[0121] The calculation formula is as follows:

[0122] ;

[0123] Parameter explanation:

[0124] n: Target speed (rpm) of motor c(20);

[0125] L: Target sampling depth (m);

[0126] v: Release speed of sampling tubing (5) (m / s);

[0127] k1, k2: Dynamic correction coefficients (calibrated based on hose material and environmental resistance)

[0128] Action execution: The microcontroller (18) drives the sampling drum (2) to release the sampling hose (5), and at the same time corrects the attitude in real time through the tilt sensor to ensure that the sampling drum (6) is inserted vertically into the groundwater layer.

[0129] In this embodiment, the parameters are explained as follows:

[0130] k1=0.8 (calibrated value of hose friction coefficient), k2=1.2 (attitude correction weight);

[0131] L=50 m (preset sampling depth), v=0.5 m / s (tweezer release speed).

[0132] Motor c (20) drives sampling drum (2) to release hose, tilt sensor provides real-time feedback data, microcontroller closed-loop control ensures sampling drum (6) verticality deviation ≤1°.

[0133] After the device is deployed, it automatically calibrates the geographic coordinates and attitude. If θ > 5°, it triggers the speed compensation mode until θ ≤ 1°.

[0134] Results: Sampling depth error <0.5%, suitable for precise positioning in complex terrain.

[0135] Step 2: Dynamic negative pressure sampling

[0136] Adaptive negative pressure control: Based on the real-time pressure data P(t) (kPa) from the pressure probe (21), a power regulation model for the vacuum pump (12) is established:

[0137] ;

[0138] Parameter explanation:

[0139] W(t): Instantaneous power (W) of vacuum pump (12);

[0140] Base power (preset based on hose length and sampling depth);

[0141] PID control parameters (calibrated experimentally);

[0142] Target negative pressure value (dynamically set based on groundwater viscosity).

[0143] Water turbine blade rotation speed optimization: Based on the turbidity C (NTU) detected by the first water quality sensor, adjust the rotation speed ω (rpm) of the rotating sampling head (11):

[0144] ;

[0145] Parameter explanation:

[0146] ωbase: Base rotational speed (calibrated value);

[0147] γ: Turbidity influencing factor (determined through calibration experiments).

[0148] In this embodiment:

[0149] The vacuum pump (12) uses a PID control model to adjust the power:

[0150] ;

[0151] Parameter explanation:

[0152] P target = 80 kPaP (dynamically set according to formation permeability);

[0153] α=0.5, β=0.2 (optimized through calibration experiments).

[0154] The rotation speed of the rotating sampling head (11) is adjusted according to the turbidity C:

[0155] ;

[0156] Applicable scenario: When C>100 NTU (high turbidity), increase the rotation speed to 90 rpm to enhance penetration.

[0157] Operating procedures:

[0158] During sampling, if a fluctuation in P(t) > 10% is detected, the microcontroller automatically adjusts the PID parameters to maintain stable negative pressure. Results: Sampling efficiency improved by 35%, with a sampling success rate > 95% in high-viscosity sediment environments.

[0159] Step 3: Multi-source data fusion monitoring

[0160] Anomaly diagnosis algorithm: The microcontroller (18) constructs a multidimensional feature vector X=[θ,ax,ay,az,C] by collecting tilt angle, acceleration and water quality data from the first detection sensor group (42), and inputs it into the support vector machine (SVM) model for anomaly classification; (classification accuracy > 95%).

[0161] If the risk of blockage is determined, the audible and visual alarm (19) is triggered and the pre-cleaning mode is started; for example, pulse-jet compressed air 3 times (0.5 seconds each time).

[0162] If the sample is determined to be "contaminated", sampling is suspended and the sample is switched to the backup sample storage tube (40), and the coordinates of the contamination source are recorded.

[0163] In this embodiment, during real-time monitoring, if X exceeds the safety threshold (e.g., C>200 NTU and θ>3°), an alarm is immediately triggered.

[0164] Effect: Abnormal response time < 2 seconds, avoiding more than 90% of sampling interruption accidents.

[0165] Step 4: Sample aliquoting and online detection

[0166] Intelligent dispensing strategy: The linear drive module (36) dynamically allocates samples to the sample storage cylinder (40) based on the real-time water quality data (such as dissolved oxygen DO mg / L) from the detection tube (38).

[0167] ;

[0168] Parameter explanation:

[0169] Q Sample storage: Sample storage cylinder (40) distributes flow rate (L / min);

[0170] Q_total: Total sample flow rate (L / min);

[0171] k,Do0: Logistic function parameters (preset according to water quality standards).

[0172] In this embodiment, the sample flow rate is dynamically allocated based on the dissolved oxygen (DO) data of the detection tube (38):

[0173] ;

[0174] Parameter explanation: DO0=4 mg / L (water quality standard threshold), k=0.5 (distribution sensitivity).

[0175] When DO < 4 mg / L (oxygen-deficient water sample), 80% of the flow rate is allocated to the sample storage cylinder (40); when DO > 6 mg / L, only 20% of the flow rate is used for sample storage, and the remainder is used for real-time detection.

[0176] The detection tube (38) uploads data to the microcontroller (18) in real time, driving the linear transmission module (36) to switch paths.

[0177] The storage capacity of highly contaminated samples has been reduced by 40%, and the timeliness of detection data has been improved to the second level.

[0178] Step 5: Optimization of the backwashing process

[0179] Gas-liquid alternating cleaning model: Based on the historical residual amount of sewage M (g), the switching cycle T (s) between the high-pressure air pump (28) and the cleaning pump is dynamically adjusted:

[0180] ;

[0181] Parameter explanation:

[0182] T-base: Basic cleaning cycle (calibration value);

[0183] δ: Residual amount correction factor;

[0184] M threshold: Threshold for residual waste liquid (determined experimentally).

[0185] Cleaning efficiency verification: The change in turbidity in the pipeline after backwashing is detected by the second water quality sensor. If the standard is not met, iterative cleaning is triggered until C≤C standard.

[0186] Technical effect

[0187] Dynamic control: Through PID algorithm and adaptive model, real-time optimization of negative pressure, speed and cleaning cycle is achieved, and sampling efficiency is improved by more than 30%;

[0188] Intelligent dispensing: Based on a logistic function-based allocation strategy, it reduces the amount of highly contaminated samples occupying the storage cylinders, improving storage resource utilization by 40%.

[0189] Anomaly warning: The SVM model has a classification accuracy of >95% for multidimensional data, effectively reducing the risk of sampling interruption;

[0190] Energy-saving and environmentally friendly: The gas-liquid alternating cleaning model reduces cleaning fluid consumption by 20%, meeting the requirements of green sampling.

[0191] Creativity in formulas and algorithms: By introducing dynamic PID control, multi-dimensional data fusion classification, and nonlinear allocation functions, traditional mechanical operation is upgraded to intelligent closed-loop control, significantly improving sampling accuracy and automation level, and solving problems such as reliance on human experience and response lag in existing technologies.

[0192] In this embodiment, the cleaning cycle is adjusted according to the residual amount M of sewage:

[0193] ;

[0194] Parameter explanation: M threshold = 50 g, δ = 0.5 (calibrated experimentally);

[0195] After cleaning, verify that the turbidity C ≤ 10 NTU; otherwise, trigger a second cleaning.

[0196] During backwashing, the high-pressure air pump (28) and the cleaning pump work alternately (air-liquid ratio 3:1), and the sewage suction pump sucks up the sewage in real time.

[0197] Results: Cleaning fluid consumption was reduced by 25%, and the pipe cleanliness compliance rate was >98%.

[0198] The above embodiments integrate traditional mechanical operations into an intelligent closed-loop system through algorithm embedding and dynamic control:

[0199] Positioning and Sampling: Kalman filtering + PID control ensures sampling accuracy;

[0200] Monitoring and Response: SVM Model Enables Multi-Dimensional Anomaly Early Warning;

[0201] Dispensing and cleaning: Nonlinear function optimization of resource allocation and gas-liquid synergy improve cleaning efficiency. Overall benefits: Full-process automation rate >90%, data reliability improved by 50%, suitable for high-standard environmental monitoring scenarios.

[0202] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0203] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A groundwater sampling device, comprising a frame (1), characterized in that: It also includes a sampling cylinder (6), a sampling roll (2) rotatably connected to the frame (1), and a cleaning roll (3). A sampling chamber (4) is opened inside the sampling cylinder (2), and a sampling hose (5) is connected to the sampling chamber (4). A first detection sensor group (42) is installed on the sampling cylinder (6). A lower valve cylinder (7) driven by a motor a (8) is rotatably installed on the inner wall of the sampling cylinder (6). A lower valve hole (9) is opened on the lower valve cylinder (7). The sampling end of the sampling hose (5) and the lower valve hole (9) are connected to the inner cavity of the lower valve cylinder (7). An upper branch pipe (10) is provided on the side of the sampling cylinder (6) and is adapted to communicate with the lower valve hole (9). A rotating sampling head (11) is provided at the bottom of the sampling cylinder (6). A rotating guide component is provided between the rotating sampling head (11) and the upper branch pipe (10). The cleaning drum (3) is equipped with a backwashing component for backwashing the upper branch pipe (10) and the sampling hose (5). The frame (1) is equipped with a vacuum pump (12) and a sample outlet cylinder (13). The negative pressure end of the vacuum pump (12) is connected to the sampling chamber (4). The sample outlet cylinder (13) is rotatably installed with an upper valve cylinder (15) driven by a motor b (14). An upper valve hole (16) is opened in the upper valve cylinder (15). The upper valve hole (16) and the sampling chamber (4) are both connected to the inner cavity of the upper valve cylinder (15). The backwashing component sucks up the cleaning sludge through the negative pressure of the upper valve hole (16). A collection pipe (17) is connected to the sample outlet cylinder (13). The frame (1) is equipped with a sample collection and detection component connected to the collection pipe (17). The backwashing component includes a flushing chamber (27) inside the washing drum (3), a high-pressure air pump (28) mounted on the frame (1), a washing tank (29), and a suction tank (30). The top of the flushing chamber (27) is rotatably connected to a three-way connector. A first washing pump is installed on the washing tank (29). The air outlet of the high-pressure air pump (28) and the liquid outlet of the first washing pump are both connected to the three-way connector. The connection between the high-pressure air pump (28) and the first washing pump and the three-way connector is... Each is equipped with a first solenoid valve. A backwash pipe (31) is wound on the cleaning drum (3). The tail end of the backwash pipe (31) is connected to the rinsing chamber (27). The other end of the backwash pipe (31) is fixedly connected to the sampling tube (6) and adapted to the lower valve hole (9). A sludge suction pump is installed on the sludge suction box (30). The negative pressure end of the sludge suction pump is connected to the sample outlet tube (13) through the negative pressure suction pipe (32). The negative pressure suction pipe (32) is adapted to the upper valve hole (16).

2. The groundwater sampling device according to claim 1, characterized in that: The frame (1) is equipped with a microcontroller (18), an audible and visual alarm (19) and two motors c (20). The sampling roll (2) and the cleaning roll (3) are driven by the two motors c (20). A pressure probe (21) is provided at the connection between the vacuum pump (12) and the sampling chamber (4). The data terminals of the pressure probe (21) and the audible and visual alarm (19) are connected to the microcontroller (18).

3. The groundwater sampling device according to claim 2, characterized in that: The first detection sensor group (42) includes an inclination sensor, a GPS positioning sensor, a triaxial acceleration sensor and a first water quality sensor installed on the sampling tube (6). The data terminals of the inclination sensor, the GPS positioning sensor, the triaxial acceleration sensor and the first water quality sensor are all connected to the microcontroller (18).

4. A groundwater sampling device according to claim 3, characterized in that: The rotating guide component includes a hydrodynamic chamber inside the sampling tube (6). The other end of the upper branch pipe (10) is connected to the hydrodynamic chamber. A hydrodynamic shaft (22) is rotatably installed inside the hydrodynamic chamber. A set of hydrodynamic blades (24) arranged in a circular array are installed on the hydrodynamic shaft (22). The bottom end of the hydrodynamic shaft (22) is fixedly connected to the rotating sampling head (11). A lower branch pipe (25) is connected to the upper part of the hydrodynamic chamber. The other end of the lower branch pipe (25) is connected to a flow collecting ring (26). The inner cavity of the flow collecting ring (26) is rotatably connected to the inner cavity of the rotating sampling head (11). The rotating sampling head (11) is inclined downward and the angle between the axis of the opening end of the rotating sampling head (11) and the horizontal plane is 45°.

5. A groundwater sampling device according to claim 4, characterized in that: It also includes a one-way outlet pipe (33) connected to the backwash pipe (31), the other end of which is fixedly connected to the upper branch pipe (10), and a second solenoid valve and a one-way outlet valve are installed inside the one-way outlet pipe (33).

6. A groundwater sampling device according to claim 5, characterized in that: The sample collection and detection assembly includes a sealing seat (34) installed on the frame (1), the other end of the collection tube (17) is fixedly connected to the sealing seat (34), a conversion slide (35) is slidably installed on the inner wall of the sealing seat (34), a linear transmission module (36) is installed on the sealing seat (34), the linear transmission module (36) is connected to the conversion slide (35), a set of threaded joints (37) are connected on the conversion slide (35), one of the threaded joints (37) is threadedly connected to a detection tube (38), a second detection sensor group (39) is installed on the detection tube (38), and sample storage cylinders (40) are threadedly installed on the other threaded joints (37). A second cleaning pump is installed on the cleaning tank (29), a cleaning tube (41) is connected to the second cleaning pump, and the cleaning tube (41) is adapted to and connected to the detection tube (38).

7. A groundwater sampling device according to claim 6, characterized in that: The second detection sensor group (39) includes a second water quality sensor and a temperature sensor installed on the detection tube (38), and the data terminals of the second water quality sensor and the temperature sensor are both connected to the microcontroller (18). The axis of the upper valve hole (16) is perpendicular to the axis of the upper valve cylinder (15), the axis of the lower valve hole (9) is perpendicular to the axis of the lower valve cylinder (7), and the axes of the sampling drum (2) and the cleaning drum (3) are both perpendicular to the horizontal plane.

8. A control method for a groundwater sampling device, based on the groundwater sampling device of claim 7, characterized in that, Includes the following steps: The microcontroller (18) calculates the device attitude deviation angle θ based on the data from the GPS positioning sensor and the triaxial accelerometer, and dynamically adjusts the speed of the motor c (20); The microcontroller (18) drives the sampling drum (2) to release the sampling hose (5), and at the same time corrects the attitude in real time through the tilt sensor to ensure that the sampling drum (6) is inserted vertically into the groundwater layer; Based on the real-time pressure data P(t) (kPa) from the pressure probe (21), a power regulation model for the vacuum pump (12) is established. The model is as follows: ； Parameter explanation: W(t): Instantaneous power (W) of vacuum pump (12); Base power; PID control parameters; Target negative pressure value; Based on the turbidity C (NTU) detected by the first water quality sensor, adjust the rotation speed ω (rpm) of the rotating sampling head (11). The microcontroller (18) constructs a multidimensional feature vector X=[θ,ax,ay,az,C] by collecting tilt angle, acceleration and water quality data from the first detection sensor group (42), and inputs it into the support vector machine (SVM) model for anomaly classification; The linear drive module (36) dynamically distributes the sample to the sample storage cylinder (40) based on the real-time water quality data of the detection tube (38). Based on the historical residual amount of sewage M (g), the switching cycle T (s) between the high-pressure air pump (28) and the cleaning pump is dynamically adjusted. The change in turbidity in the pipeline after backwashing is detected by a second water quality sensor. If the turbidity does not meet the standard, iterative cleaning is triggered until C ≤ C standard.

9. The control method for the groundwater sampling device according to claim 8, characterized in that, The formula for calculating the attitude deviation angle θ is as follows: ； Parameter explanation: n: Target speed (rpm) of motor c(20); L: Target sampling depth (m); v: Release speed of sampling tubing (5) (m / s); : Dynamic correction coefficient; The formula for adjusting the rotational speed ω (rpm) of the rotating sampling head (11) is as follows: ； Parameter explanation: ωbase: Base rotational speed; γ: Turbidity influencing factor; The formula for calculating the dynamic distribution flow rate of the sample storage cylinder (40) is as follows: ； Parameter explanation: : Sample storage tube (40) distribution flow rate (L / min); Total sample flow rate (L / min); Logistic function parameters; The formula for the switching period T is as follows: Parameter explanation: Basic cleaning cycle; δ: Residual amount correction factor; : Threshold for residual wastewater.

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