Automatic sampling device for underground water monitoring

Abstract

The invention discloses an automatic sampling device for underground water monitoring, and belongs to the technical field of underground water sampling. An automatic sampling device for underground water monitoring comprises a mobile power supply, a control module, a submersible pump, a receiving tank and a monitoring device, the control module is electrically connected with the submersible pump, the mobile power source and the monitoring device through cables. The receiving tank is communicated with the submersible pump through a water pipe and used for collecting and storing water samples, the monitoring device is used for monitoring parameters of underground water samples, and the control module is used for controlling start-stop and sampling time of the submersible pump and receiving the parameters of the underground water samples monitored by the monitoring device; the submersible pump comprises a pump body, a waterproof motor and an impurity removal device; the waterproof motor is detachably connected with the lower part of the pump body and drives the pump body to operate to extract a water sample; the impurity removal device is arranged between the waterproof motor and the pump body, impurities in underground water entering the pump body can be synchronously filtered in the sampling process, dirt adhesion is prevented, and the service life of the device is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of groundwater sampling, and more specifically, relates to an automatic groundwater monitoring sampling device. Background Art

[0002] Groundwater monitoring and sampling are important links in environmental assessment, pollution control, and hydrogeological research; for groundwater quality monitoring, instantaneous water samples are usually collected. For well water whose water level needs to be measured, the groundwater level should be measured before sampling and carried out after sufficient pumping to ensure that the water sample can represent the groundwater quality; traditional groundwater sampling devices usually pump water samples through a submersible pump and record groundwater parameters by synchronously monitoring water quality parameters.

[0003] Existing groundwater sampling devices usually automate and multi-dimensionally monitor groundwater through a data storage and control module, a data transmission and connection module, and a measurement unit module; however, when the existing water quality monitoring and sampling device monitors water quality, some dirt adheres to the inside of the submersible pump, which will not only affect the detection results during subsequent groundwater sampling and monitoring, but also cause dirt deposition and shorten the service life of the device; for example, a groundwater quality monitoring and sampling device and its use method for facilitating dirt cleaning (CN202410639096.X) disclosed in the Chinese invention patent literature uses the power generated when sampling groundwater at the next position of the hull to clean the sampling cylinder from the previous time, ensuring that the inner wall of the sampling cylinder will not adhere to dirt; however, the application situation of this application is limited by the movement of the ship during use, and it is impossible to ensure that the dirt inside the submersible pump is removed when there is no power provided by the ship's movement.

[0004] Therefore, we need to provide a groundwater sampling device that is widely applicable and can timely and effectively remove the dirt of the submersible pump. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic groundwater monitoring sampling device with high monitoring accuracy and wide application range. By setting a cleaning device to synchronously remove scale during the groundwater sampling process, the inside of the submersible pump is kept clean, and the accuracy of water quality monitoring is improved.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: An automatic groundwater monitoring sampling device of the present invention includes a mobile power source, a control module, a submersible pump, a receiving tank, a monitoring device, and a cable; the control module is electrically connected to the submersible pump, the mobile power source, and the monitoring device through the cable; the submersible pump is communicated with the receiving tank through a water pipe for pumping groundwater samples; the receiving tank is used for collecting and storing water samples, the monitoring device is used for monitoring the parameters of the groundwater samples, and the control module is used for controlling the start and stop of the submersible pump and the sampling time and receiving the parameters of the groundwater samples monitored by the monitoring device; the control module can set the sampling time and frequency to ensure the continuity and accuracy of water sample collection.

[0007] The submersible pump includes a pump body, a waterproof motor, and an impurity removal device; the waterproof motor is detachably connected to the lower part of the pump body, and the waterproof motor drives the pump body to operate and pump water samples; the impurity removal device is arranged between the waterproof motor and the pump body, and can synchronously filter the impurities in the groundwater entering the pump body during the sampling process to prevent dirt adhesion and extend the service life of the device.

[0008] As a further improvement of the present invention, the control module includes a box body and a power interface, a water level drawdown meter interface, a flow meter interface, a water quality detector interface, a display screen, a speed regulation knob, and a submersible pump interface installed inside the box body; the control module respectively receives the monitoring data of the monitoring device through the water level drawdown meter interface, the flow meter interface, and the water quality detector interface, the display screen is used for real-time displaying the monitoring data and the working state of the submersible pump, and the speed regulation knob is used for adjusting the pumping speed of the submersible pump; the submersible pump interface is electrically connected to the submersible pump for transmitting the instruction for the control module to control the operation of the submersible pump.

[0009] As a further improvement of the present invention, the pump body includes a pump shell, a multi-stage impeller, a connecting frame, an installation side pipe, and a top cover; the multi-stage impeller is installed inside the pump shell and is detachably connected to the waterproof motor. When the multi-stage impeller rotates at a high speed, it generates centrifugal force to push the liquid to flow, thereby pumping groundwater samples; the connecting frame is detachably installed at the bottom of the pump shell for fixing the waterproof motor and the impurity removal device; the installation side pipe is fixedly installed on the side of the pump shell for accommodating the cable between the waterproof motor and the control module, avoiding cable entanglement and ensuring that the cable is not damaged during operation; the top cover is detachably connected to the top of the pump shell, and there are a water outlet and a cable port above the top cover. The water outlet is used for transporting the pumped groundwater samples to the receiving tank and the monitoring device through a water pipe; the cable port is used for leading out the cable and connecting the control module.

[0010] As a further improvement of the present invention, the installation side pipe penetrates into the pump body through the top arc pipe, effectively preventing cable wear; a through hole is opened in the middle of the installation side pipe for connecting the impurity removal device; the position of the through hole is consistent with that of the impurity removal device for reducing the exposure of the cable in water and reducing the short-circuit risk.

[0011] As a further improvement of the present invention, the impurity removal device includes a filter screen, a scraper, a differential pressure sensor, a cylinder, and a push plate; the contour of the filter screen is semi-circular, and it is detachably installed at the bottom of the pump body, and the outer surface of the filter screen is attached to the scraper; the scraper is detachably connected to the waterproof motor, and the scraper includes a connecting ring detachably connected to the output shaft of the waterproof motor and several uniformly circumferentially distributed plate surfaces, and the upper part of the plate surface is rotatably connected to the filter screen; the differential pressure sensor is arranged on both the inside and outside of the filter screen to detect the change in the differential pressure generated inside and outside the filter screen due to the blockage of the filter screen by dirt; the differential pressure sensor and the cylinder are electrically connected to the control module through cables, and the cylinder is controlled to start by the control module after the differential pressure inside and outside the filter screen increases; the push plate is located below the filter screen and is slidably connected to the output shaft of the waterproof motor, and the cylinder is detachably connected to the push plate to push the push plate to drive the water flow to remove the dirt attached to the surface of the filter screen, ensuring the filtering effect and extending the stable operation period of the device.

[0012] As a further improvement of the present invention, the width of the plate surface of the scraper decreases from top to bottom, so that inclined guide planes are formed on both sides of the plate surface to guide the scraped dirt away from the filter screen and prevent the dirt from adhering again.

[0013] As a further improvement of the present invention, the monitoring device includes a water quality detector, a flow meter, and a water level drawdown meter. One end of the water quality detector is electrically connected to the water quality detector interface, and the other end is connected to the receiving tank through a water pipe to detect the turbidity, temperature, pH, oxidation-reduction potential, dissolved oxygen, and conductivity of the extracted groundwater sample; the flow meter is electrically connected to the flow meter interface to record the instantaneous flow rate and cumulative flow rate of the submersible pump; the water level drawdown meter is electrically connected to the water level drawdown meter interface to measure the static water level, well depth, and real-time data of the water level change. When the water level drops by 10 cm, the system automatically alarms and stops sampling, and automatically restarts the sampling process after the water level recovers.

[0014] As a further improvement of the present invention, the control module is feedback-regulated by the monitoring device, and automatically ends the sampling when the water extraction volume calculated by the flow meter reaches 3 - 5 times the well volume of water or when the changes in three of the six parameters detected by the water quality detector reach a stable range for three consecutive measurements.

[0015] The six-parameter range detected by the water quality detector includes turbidity < 10 NTU or turbidity change within ±10%, conductivity change within ±10%, pH change within ±0.1, temperature within ±0.5 °C, oxidation-reduction potential change within ±10 mV or +10%, and dissolved oxygen change within ±0.3 mg / L or +10%. The reliability of automatic control is improved by the combined determination of multiple parameters.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: an automatic sampling device for groundwater monitoring of the present invention is electrically connected to a submersible pump and a monitoring device through a control module to control the start and stop of the submersible pump and the sampling time, and to receive the groundwater sample parameters monitored by the monitoring device, thereby realizing the centralized processing of monitoring data and control instructions, and the operator can simultaneously complete parameter monitoring, status display and operation adjustment through a single control module; by arranging an impurity removal device at the submersible pump to filter impurities in the groundwater entering the pump body, it is avoided that impurities enter the submersible pump and damage the pump body, and the dirt of the submersible pump can be removed in time and effectively, thereby improving the service life of the device; by arranging a scraper with a gradually decreasing width from top to bottom that fits the filter screen to remove dirt on the surface of the filter screen, the cleaning efficiency is improved, and the oblique guide planes formed on both sides of the plate surface can remove dirt The water is diverted away from the filter to avoid secondary adhesion of dirt. The differential pressure sensor is set to detect that the pressure difference between the inside and outside of the filter is too large, and then it is linked with the cylinder and the push plate to realize the instantaneous reverse flushing of the filter by water to achieve the effect of automatic removal of dirt, thereby avoiding the influence of dirt deposition on the detection results and the service life of the device, ensuring the accuracy of the monitoring data and the long-term stability of the device. The control module is fed back by the pumping volume collected by the monitoring device and the six parameters detected by the water quality detector, which solves the problem of difficult to accurately judge the termination timing during groundwater sampling, ensuring that the collected samples can accurately reflect the actual water quality status. At the same time, when the residual water in the well is fully replaced or the water quality parameters tend to be stable, the system automatically stops running, which not only avoids the energy loss caused by excessive pumping, but also eliminates the random errors introduced by manual operation, and improves the reliability of monitoring data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an automatic sampling device for groundwater monitoring of the present invention; Figure 2 A schematic diagram of the structure of a submersible pump of an automatic sampling device for groundwater monitoring according to the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of a submersible pump of an automatic sampling device for groundwater monitoring of the present invention; Figure 4 The present invention is a schematic diagram of the structure of an impurity removal device of an automatic sampling device for groundwater monitoring.

[0018] Figure 5 This is a schematic diagram of the structure of the impurity removal device A of the automatic sampling device for groundwater monitoring of the present invention. Figure 6 A schematic diagram of the control module structure of an automatic sampling device for groundwater monitoring according to the present invention Description of the numbers in the figure: 1 Mobile power supply, 2 Control module, 21 Box body, 22 Power interface, 23 Water level drawdown meter interface, 24 Flowmeter interface, 25 Water quality detector interface, 26 Display screen, 27 Speed control knob, 28 Submersible pump interface, 3 Submersible pump, 31 Pump body, 311 Pump shell, 312 Multi-stage impeller, 313 Connecting frame, 314 Installation side pipe, 3141 Through hole, 315 Top cover, 316 Water outlet, 317 Cable port, 32 Waterproof motor, 33 Impurity removal device, 331 Filter screen, 332 Scraper, 3321 Connecting ring, 3322 Plate surface, 333 Differential pressure sensor, 334 Cylinder, 335 Push plate, 4 Receiving tank, 5 Monitoring device, 51 Water quality detector, 52 Flowmeter, 53 Water level drawdown meter, 6 Cable, 7 Water pipe. Detailed implementation mode

[0019] Specific embodiment 1: Please refer to Figures 1 - 6 An automatic sampling device for groundwater monitoring, comprising a mobile power supply 1, a control module 2, a submersible pump 3, a receiving tank 4, a monitoring device 5 and a cable 6; the control module 2 is electrically connected to the submersible pump 3, the mobile power supply 1 and the monitoring device 5 through the cable 6; the submersible pump 3 is communicated with the receiving tank 4 through a water pipe 7 for pumping groundwater samples; the receiving tank 4 is used for collecting and storing water samples, the monitoring device 5 is used for monitoring the parameters of groundwater samples, and the control module 2 is used for controlling the start and stop of the submersible pump 3 and the sampling time and receiving the parameters of groundwater samples monitored by the monitoring device 5; the control module 2 can set the sampling time and frequency to ensure the continuity and accuracy of water sample collection.

[0020] As Figure 2 shown, the submersible pump 3 includes a pump body 31, a waterproof motor 32 and an impurity removal device 33; the waterproof motor 32 is detachably connected to the lower part of the pump body 31, and the waterproof motor 32 drives the pump body 31 to operate and pump water samples; the impurity removal device 33 is arranged between the waterproof motor 32 and the pump body 31, and can filter the impurities in the groundwater entering the pump body 31 synchronously during the sampling process to prevent dirt adhesion and extend the service life of the device.

[0021] Specifically, as Figure 5 shown, the control module 2 includes a box body 21 and a power interface 22, a water level drawdown meter interface 23, a flowmeter interface 24, a water quality detector interface 25, a display screen 26, a speed control knob 27 and a submersible pump interface 28 installed inside the box body 21; the control module 2 receives the monitoring data of the monitoring device 5 through the water level drawdown meter interface 23, the flowmeter interface 24 and the water quality detector interface 25 respectively, the display screen 26 is used for real-time displaying the monitoring data and the working state of the submersible pump 3, and the speed control knob 27 is used for adjusting the pumping speed of the submersible pump 3; the submersible pump interface 28 is electrically connected to the submersible pump 3 for transmitting the instruction for the control module 2 to control the operation of the submersible pump 3.

[0022] Specifically, as Figure 3The pump body 31 shown includes a pump housing 311, a multi-stage impeller 312, a connecting frame 313, an installation side pipe 314, and a top cover 315; the multi-stage impeller 312 is installed inside the pump housing 311 and is detachably connected to the waterproof motor 32; the multi-stage impeller 312 is a pressurization unit composed of multiple centrifugal impellers connected in series. When rotating at high speed step by step, it generates centrifugal force to push the liquid to flow, thereby efficiently extracting groundwater samples; the connecting frame 313 is detachably installed at the bottom of the pump housing 311 and is used to fix the waterproof motor 32 and the impurity removal device 33; the installation side pipe 314 is fixedly installed on the side of the pump housing 311 and is used to accommodate the cable 6 between the waterproof motor 32 and the control module 2. Its internal channel provides physical protection for the cable 6 to prevent the cable 6 from being damaged or entangled during water flow scouring or mechanical vibration, ensuring that the cable 6 is not damaged during operation; the top cover 315 is detachably connected to the top of the pump housing 311. An outlet 316 and a cable port 317 are provided above the top cover 315. The outlet 316 is used to transport the extracted groundwater sample to the receiving tank 4 and the monitoring device 5 through the water pipe 7; the cable port 317 is used to lead out the cable 6 and connect it to the control module 2; the outlet 316 and the cable port 317 are respectively provided with independent channels to achieve physical isolation between water sample transportation and power control.

[0023] Specifically, as Figure 4 shown, the installation side pipe 314 penetrates into the pump body 31 through the top arc pipe, effectively preventing the cable 6 from being worn; a through hole 3141 is opened in the middle of the installation side pipe 314 for connecting the impurity removal device 33; the position of the through hole 3141 is consistent with that of the impurity removal device 33 to reduce the exposure of the cable 6 in water and reduce the risk of short circuit.

[0024] Specifically, as Figure 5The impurity removal device 33 shown includes a filter screen 331, a scraper 332, a differential pressure sensor 333, a cylinder 334, and a push plate 335; the outline of the filter screen 331 is semi-circular, and it is detachably installed at the bottom of the pump body 31. The outer surface of the filter screen 331 is in contact with the scraper 332; the scraper 332 is detachably connected to the waterproof motor 32. The scraper 332 includes a connection ring 3321 detachably connected to the output shaft of the waterproof motor 32 and several plate surfaces 3322 evenly distributed circumferentially. The upper part of the plate surface 3322 is rotatably connected to the filter screen 331; the differential pressure sensor 333 is arranged on both the inside and outside of the filter screen 331 to detect the change in the differential pressure generated inside and outside the filter screen 331 due to dirt blocking the filter screen 331; the differential pressure sensor 333 and the cylinder 334 are electrically connected to the control module 2 through a cable 6, and the control module 2 controls the start of the cylinder 334 after the differential pressure inside and outside the filter screen 331 increases; the push plate 335 is located below the filter screen 331 and is slidably connected to the output shaft of the waterproof motor 32. The cylinder 334 is detachably connected to the push plate 335 and is used to push the push plate 335 to drive the water flow to remove the dirt attached to the surface of the filter screen 331, ensuring the filtering effect and extending the stable operation period of the device; when the submersible pump 3 operates, the groundwater enters the pump body 31 through the filter screen 331 of the impurity removal device 33, and the impurities are intercepted outside the filter screen 331. The waterproof motor 32 drives the scraper 332 to rotate, and the edge of the plate surface 3322 contacts the outer surface of the filter screen 331 and scrapes off the attached dirt; when the filter screen 331 is blocked and the differential pressure inside and outside exceeds the set value, the differential pressure sensor 333 transmits a signal to the control module 2, triggering the cylinder 334 to push the push plate 335 to slide along the output shaft of the waterproof motor 32. The displacement of the push plate 335 causes the water flow to instantaneously reverse and wash the filter screen 331, washing the scraped dirt away from the surface of the filter screen 331. After the cleaning is completed, the differential pressure sensor 333 detects that the differential pressure returns to normal, and the cylinder 334 resets and waits for the next trigger; thus, real-time dirt removal during the operation of the submersible pump 3 is achieved, avoiding the accumulation of impurities from affecting the accuracy of water quality detection. At the same time, the mechanical linkage cleaning mechanism reduces the frequency of manual maintenance and extends the continuous working time of the equipment in a complex water quality environment.

[0025] Specifically, the width of the plate surface 3322 of the scraper 332 decreases from top to bottom, forming inclined planes for guiding the flow on both sides of the plate surface 3322. The fluid shear force generated by the change in the width of the plate surface 3322 can accelerate the detachment of the dirt. The directional flow formed by the inclined plane structure ensures that the dirt is effectively carried away from the filter screen area, avoiding secondary attachment of the dirt, reducing the risk of blockage of the filter screen 331, extending the continuous working time of the equipment, and ensuring the accuracy of groundwater monitoring data.

[0026] Specifically, as Figure 6The monitoring device 5 shown includes a water quality detector 51, a flowmeter 52, and a water level drawdown meter 53. One end of the water quality detector 53 is electrically connected to the water quality detector interface 25, and the other end is connected to the receiving tank 4 through a water pipe 7, which is used to detect the turbidity, temperature, pH, redox potential, dissolved oxygen, and conductivity of the extracted groundwater sample; the flowmeter 52 is electrically connected to the flowmeter interface 24, which is used to record the instantaneous flow rate and cumulative flow rate of the submersible pump 3; the water level drawdown meter 53 is electrically connected to the water level drawdown meter interface 23, which is used to measure the static water level, well depth, and real-time data of water level changes; when the water level drops by 10 cm, the system automatically alarms and stops sampling. After the water level recovers, the sampling process is automatically restarted.

[0027] Specifically, the control module 2 is feedback-regulated by the monitoring device 5 and automatically ends the sampling when the water extraction volume calculated by the flowmeter 52 reaches 3 - 5 times the well volume or when the changes in three of the six parameters detected by the water quality detector 51 reach a stable range in three consecutive measurements; thus solving the problem that it is difficult to accurately judge the termination timing during the groundwater sampling process and ensuring that the collected samples can accurately reflect the true water quality state; at the same time, when the residual water in the well is fully replaced or the water quality parameters tend to be stable, the system automatically stops running, which not only avoids energy consumption caused by over-pumping but also eliminates random errors introduced by manual operation, improving the reliability of monitoring data.

[0028] Specifically, the six-parameter ranges detected by the water quality detector 51 include turbidity < 10 NTU or turbidity change within ±10%, conductivity change within ±10%, pH change within ±0.1, temperature within ±0.5 °C, redox potential change within ±10 mV or +10%, and dissolved oxygen change within ±0.3 mg / L or +10%. The reliability of automatic control is improved through multi-parameter joint determination.

[0029] During use, each component is connected through cable 6 and water pipe 7. The submersible pump 3 is placed underground to start working. The water quality detector 51, flowmeter 52 and water level drawdown meter 53 monitor data in real time. The control module 2 automatically adjusts the sampling speed according to preset parameters. When the submersible pump 3 is running, groundwater enters the pump body 31 through the filter screen 331 of the impurity removal device 33. The impurities are intercepted outside the filter screen 331. The waterproof motor 32 drives the scraper 33 to rotate synchronously with the multi-stage impeller 312. The edge of the plate surface 3322 contacts the outer surface of the filter screen 331 and scrapes off the attached dirt. When the pressure difference between the inside and outside exceeds the set value due to the blockage of the filter screen 331, the pressure difference sensor 333 transmits a signal to the control module 2, triggering the cylinder 334 to push the push plate 335 to slide along the output shaft of the waterproof motor 32. The displacement of the push plate 335 causes the water flow to instantaneously reverse and wash the filter screen 331, flushing the scraped dirt off the surface of the filter screen 331. After the cleaning is completed, the pressure difference sensor 333 detects that the pressure difference returns to normal, and the cylinder 334 resets and waits for the next trigger. Thus, real-time dirt removal during the operation of the submersible pump 3 is achieved. When the water extraction volume calculated by the flowmeter 52 reaches 3-5 times the well volume or the change in three consecutive measurements of three of the six parameters detected by the water quality detector 51 reaches a stable range, the sampling is automatically ended, ensuring the accuracy and efficiency of the sampling process.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic sampling device for groundwater monitoring, characterized in that: It includes a mobile power supply (1), a control module (2), a submersible pump (3), a receiving tank (4), a monitoring device (5) and a cable (6); the control module (2) is electrically connected to the submersible pump (3), the mobile power supply (1) and the monitoring device (5) respectively through the cable (6); the submersible pump (3) is communicated with the receiving tank (4) through a water pipe (7) for pumping groundwater samples; the receiving tank (4) is used for collecting and storing water samples, the monitoring device (5) is used for monitoring the parameters of groundwater samples, and the control module (2) is used for controlling the start and stop of the submersible pump (3) and the sampling time and receiving the parameters of groundwater samples monitored by the monitoring device (5). The submersible pump (3) includes a pump body (31), a waterproof motor (32) and an impurity removal device (33); the waterproof motor (32) is detachably connected to the lower part of the pump body (31), and the waterproof motor (32) drives the pump body (31) to operate and pump water samples; the impurity removal device (33) is arranged between the waterproof motor (32) and the pump body (31) for filtering impurities in the groundwater entering the pump body (31).

2. The automatic groundwater monitoring sampling device according to claim 1, characterized in that: The control module (2) includes a box body (21) and a power interface (22), a water level drawdown meter interface (23), a flowmeter interface (24), a water quality detector interface (25), a display screen (26), a speed regulation knob (27) and a submersible pump interface (28) installed inside the box body (21); the control module (2) receives the monitoring data of the monitoring device (5) respectively through the water level drawdown meter (23) interface, the flowmeter interface (24) and the water quality detector interface (25), the display screen (26) is used for real-time displaying the monitoring data and the working state of the submersible pump (3), and the speed regulation knob (27) is used for adjusting the pumping speed of the submersible pump (3); the submersible pump interface (28) is electrically connected to the submersible pump (3) for transmitting the instruction for the control module (2) to control the operation of the submersible pump (3).

3. The automatic sampling device for groundwater monitoring according to claim 1, characterized in that: The pump body (31) includes a pump shell (311), a multi-stage impeller (312), a connecting frame (313), an installation side pipe (314) and a top cover (315); the multi-stage impeller (312) is installed inside the pump shell (311) and is detachably connected to the waterproof motor (32) for pumping groundwater samples. The connecting frame (313) is detachably installed at the bottom of the pump shell (311) for fixing the waterproof motor (32) and the impurity removal device (33); the installation side pipe (314) is fixedly installed on the side of the pump shell (311) for accommodating the cable (6) between the waterproof motor (32) and the control module (2); the top cover (315) is detachably connected to the top of the pump shell (311), and a water outlet (316) and a cable port (317) are arranged above the top cover (315), the water outlet (316) is used for transporting the pumped groundwater samples to the receiving tank (4) and the monitoring device (5) through the water pipe (7); the cable port (317) is used for leading out the cable (6) and connecting the control module (2).

4. The automatic groundwater monitoring sampling device according to claim 3, characterized in that: The installation side pipe (314) penetrates into the pump body (31) through the top arc pipe, and a through hole is opened in the middle of the installation side pipe (314) for connecting the impurity removal device (33).

5. The automatic groundwater monitoring sampling device according to claim 3, characterized in that: The impurity removal device (33) includes a filter screen (331), a scraper (332), a differential pressure sensor (333), a cylinder (334) and a push plate (335); the filter screen (331) has a semi-circular contour and is detachably installed at the bottom of the pump body (31), and the outer surface of the filter screen (331) is in contact with the scraper (332); the scraper (332) is detachably connected to the waterproof motor (32), and the scraper (332) includes a connection ring (3321) detachably connected to the output shaft of the waterproof motor (32) and several plate surfaces (3322) evenly distributed circumferentially, and the upper part of the plate surface (3322) is rotatably connected to the filter screen (331); the differential pressure sensor (333) is arranged on both the inside and outside of the filter screen (331) for detecting the differential pressure generated inside and outside the filter screen (331); the differential pressure sensor (333) and the cylinder (334) are electrically connected to the control module (2) through a cable (6), and the cylinder (334) is controlled to start after the differential pressure inside and outside the filter screen (331) increases through the control module (2); the push plate (335) is located below the filter screen (331) and is slidably connected to the output shaft of the waterproof motor (32), and the cylinder (334) is detachably connected to the push plate (335) for pushing the push plate (335) to drive the water flow to remove the dirt attached to the surface of the filter screen (331).

6. The automatic sampling device for groundwater monitoring according to claim 5, wherein: The width of the plate surface (3322) of the scraper (332) decreases from top to bottom, so that inclined guiding planes are formed on both sides of the plate surface (3322) for guiding the scraped dirt away from the filter screen (331).

7. The automatic sampling device for groundwater monitoring according to claim 2, characterized in that: The monitoring device (5) includes a water quality detector (51), a flow meter (52) and a water level drawdown meter (53). One end of the water quality detector (51) is electrically connected to the water quality detector interface (25), and the other end is connected to the receiving tank (4) through a water pipe (7) for detecting the turbidity, temperature, pH, redox potential, dissolved oxygen and conductivity of the extracted groundwater sample; the flow meter (52) is electrically connected to the flow meter interface (24) for recording the instantaneous flow rate and cumulative flow rate of the submersible pump (3); the water level drawdown meter (53) is electrically connected to the water level drawdown meter interface (23) for measuring the static water level, well depth and water level change.

8. An automatic groundwater monitoring sampling device according to claim 7, characterized in that: The control module (2) is feedback-regulated by the monitoring device (5) and automatically ends the sampling when the water extraction volume calculated by the flow meter (52) reaches 3 - 5 times the well volume of water or when the changes in three of the six parameters detected by the water quality detector (51) reach a stable range for three consecutive measurements.

9. The automatic groundwater monitoring sampling device according to claim 8, characterized in that: The six-parameter intervals detected by the water quality detector (51) include turbidity < 10 NTU or turbidity change within ±10%, conductivity change within ±10%, pH change within ±0.1, temperature within ±0.5 °C, redox potential change within ±10 mV or +10%, and dissolved oxygen change within ±0.3 mg / L or +10%.

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