Underground water on-line multi-point continuous monitoring system

Abstract

The invention belongs to the field of underground water monitoring, and particularly relates to an underground water on-line multi-point continuous monitoring system which comprises a detection device, a sampling device and a monitoring terminal, the sampling device is fed into a well through a lifting rope and comprises a fixing part connected with the lifting rope and a sampling mechanism, and the sampling mechanism comprises a pod and a hanging rope. The pod is suspended below the equipment cabin by virtue of a hanging rope, and a winch for driving the hanging rope to lift is arranged in the equipment cabin. The detection equipment and the sampling equipment are integrally arranged and are often arranged in an underground water monitoring well, when the water quality is measured, the pod is lowered through the winch in the equipment cabin, so that water enters the pod, a water sample is injected into the pod, then the pod is lifted through the winch and is communicated with the detection equipment, and the water sample is detected; therefore, online continuous monitoring is achieved, water samples at different depth points can be obtained by presetting different lifting depths of the winch, and the monitoring range and flexibility are further improved.

Description

Technical Field

[0001] The invention belongs to the field of groundwater monitoring, and in particular relates to an online multi-point continuous groundwater monitoring system. Background Art

[0002] Online monitoring of groundwater has far-reaching significance. It is not only related to the sustainable use of water resources, but also directly affects the protection of the ecological environment and the sustainable development of human society. Through online monitoring of groundwater, abnormal groundwater quality can be discovered in time, and timely warnings can be provided to relevant departments to avoid the spread of water pollution incidents.

[0003] For the continuous monitoring of groundwater, staff are required to regularly take water samples from sampling wells, test the water quality through conductivity meters and other testing equipment, and summarize the data on the monitoring terminal to form monitoring data, which has high labor costs. Alternatively, online monitoring is performed by pumping water through a catheter. Due to the long length of the catheter and the large amount of water stored, the water samples before and after are easily mixed, and the accurate collection of water samples cannot be guaranteed, which in turn affects the monitoring results. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention provides an online multi-point continuous monitoring system for groundwater. The monitoring terminal is retained in the monitoring well, and the water in the well can be sampled and tested at any time. The sampling path is short and the water sample quality is high, which helps to improve the level of online monitoring of groundwater.

[0005] The specific technical solution adopted by the present invention is:

[0006] An online multi-point continuous monitoring system for groundwater comprises a detection device, a sampling device and a monitoring terminal. The sampling device is arranged in a groundwater sampling well for collecting water samples. The detection device detects the collected water samples and sends the detection results to the monitoring terminal. The sampling device is sent into the well with the help of a suspension rope. The sampling device comprises a fixing part connected to the suspension rope and a sampling mechanism. An equipment cabin is arranged below the fixing part. The detection device is placed in the equipment cabin. The sampling mechanism comprises a pod and a hanging rope. The pod is suspended below the equipment cabin with the help of a hanging rope. A winch for driving the hanging rope to rise and fall is arranged in the equipment cabin. The pod is connected or disconnected with the detection mechanism by the lifting of the winch.

[0007] A docking mechanism is also provided under the pod, and the docking mechanism includes a reducer, a flexible vertical component and a welcoming component. The flexible vertical component includes an upper flange, a lower flange and a coil spring connected between the upper flange and the lower flange. The welcoming component includes a guide tube, a welcoming plate and a docking cabin. The welcoming plate is an annular structure mounted on the guide tube, and a recessed slide groove is provided on the guide tube. A protruding slider is provided on the inner ring side of the welcoming plate, and the slider extends into the slide groove to form a sliding connection. The lower end of the guide tube is a spherical cap structure, and the upper end of the guide tube is fixedly connected to the lower flange. The docking cabin is a hollow annular structure mounted on the upper end of the guide tube, and the guide tube is offset in the vertical direction by the bending of the coil spring.

[0008] The pod is provided with a first inlet and outlet pipe and a second inlet and outlet pipe, and the docking cabin is provided with a first insertion hole and a second insertion hole which are plugged into and fit with the first inlet and outlet pipe and the second inlet and outlet pipe. The insertion sides of the first insertion hole and the second insertion hole are both in a trumpet-shaped structure. The first insertion hole is connected to the detection equipment by means of a sampling tube, and the second insertion hole is connected to the external environment by means of an air filter.

[0009] The hanging ropes are arranged in two groups and pass through the flange holes of the upper flange and the lower flange and form limits with the help of the flange holes. The welcoming and sending plate is also provided with a through hole for the hanging rope to pass through. The welcoming and sending plate is also provided with a primary limit hole with a larger aperture than the first inlet and outlet pipe and the second inlet and outlet pipe. The first inlet and outlet pipe and the second inlet and outlet pipe have the freedom of insertion and extraction of the primary limit hole by tightening and loosening the hanging rope.

[0010] The fixing part includes a core barrel, a waste liquid barrel and a fixing assembly arranged on the outer wall of the core barrel, the fixing assembly includes multiple groups of posting plates arranged around the core barrel, a lifting assembly is arranged between the posting plates and the core barrel, the lifting assembly includes a wedge block arranged on the outer wall of the core barrel and a sliding sleeve arranged on the inner side of the posting plate and slidingly matched with the wedge block, the lower end of the wedge block faces the downhole direction, the lifting assembly also includes a sliding flange mounted on the upper end of the core barrel, the lower side of the sliding flange is hingedly connected to the posting plate by means of a traction arm, and the posting plate slides along the lifting direction of the wedge block by pulling the sliding flange.

[0011] The poster board is also provided with a positioning plug plate, a limiting hole is provided on the poster board, the positioning plug plate is arranged in the limiting hole, the positioning plug plate is L-shaped and its angled end is hinged to the side wall of the limiting hole, the plug plate portion of the positioning plug plate is flush with the surface of the poster board, the connecting portion of the positioning plug plate is provided with an oblong hole, the outer wall of the core tube is provided with a limiting pin, the connecting portion of the positioning plug plate forms a sliding connection with the limiting pin by means of its oblong hole, and the positioning plug plate has the freedom of swinging to be lifted up or closed from the poster board by means of the movement of the poster board.

[0012] The waste liquid cylinder is connected between the core cylinder and the equipment cabin. Both the core cylinder and the waste liquid cylinder are hollow cylindrical structures. An injection port is provided at the upper end of the core cylinder, a clean water output port is provided at the side wall at the lower end of the core cylinder, a waste liquid input port is provided at the lower end of the waste liquid cylinder, and an air pressure balance port is provided at the upper end of the waste liquid cylinder. The clean water output port is connected to the clean water flushing side of the detection equipment by means of a clean water pump, and the waste water side of the detection equipment is connected to the waste liquid input port of the waste liquid cylinder by means of a waste liquid pump.

[0013] The end of the core tube is also provided with a lifting ear, and the lifting rope is bound and connected to the lifting ear.

[0014] The beneficial effects of the present invention are:

[0015] The detection equipment and sampling equipment of the present invention are integrated and usually placed in a groundwater monitoring well. When measuring water quality, the pod is lowered by a winch in the equipment cabin so that the pod enters the water and is filled with water samples. The pod is then lifted up by the winch and connected to the detection equipment to detect the water samples, thereby realizing online continuous monitoring. By presetting different lifting depths of the winch, water samples at different depths can be obtained, thereby further improving the scope and flexibility of monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0018] Figure 3 for Figure 1 An enlarged schematic diagram of the sampling mechanism in the middle;

[0019] Figure 4 A schematic diagram of the connection between the fixed part and one end of the suspension rope;

[0020] Figure 5 is a schematic diagram of the internal structure of the fixed part;

[0021] Figure 6 A schematic diagram of the movement of the posting board;

[0022] Figure 7 This is a schematic diagram of the internal structure of the pod;

[0023] Figure 8 It is a connection schematic diagram of the pipeline of the present invention;

[0024] In the attached drawings, 1. detection equipment, 2. lifting rope, 3. equipment cabin, 4. pod, 5. hanging rope, 6. reducer, 7. upper flange, 8. lower flange, 9. coil spring, 10. guide tube, 11. receiving and sending plate, 12. docking cabin, 13. slide, 14. first inlet and outlet pipe, 15. second inlet and outlet pipe, 16. first insertion hole, 17. second insertion hole, 18. sampling tube, 19. air filter element, 20. primary limiting hole, 21. core tube, 22. waste liquid tube, 23. posting board, 24. wedge, 25. sliding sleeve, 26. sliding flange, 27. traction arm, 28. positioning plug plate, 29. limiting pin, 30. injection port, 31. clean water output port, 32. waste liquid input port, 33. air pressure balance port, 34. lifting ear. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0026] Specific implementation examples Figure 1-Figure 8 As shown, the present invention is an online multi-point continuous monitoring system for groundwater, including a detection device 1, a sampling device and a monitoring terminal. The sampling device is arranged in a groundwater sampling well for collecting water samples. The detection device 1 detects the collected water samples and sends the detection results to the monitoring terminal. The sampling device is sent into the well with the help of a suspension rope 2. The sampling device includes a fixed part connected to the suspension rope 2 and a sampling mechanism. An equipment cabin 3 is arranged below the fixed part. The detection device 1 is placed in the equipment cabin 3. The sampling mechanism includes a pod 4 and a hanging rope 5. The pod 4 is suspended below the equipment cabin 3 with the help of the hanging rope 5. A winch for driving the hanging rope 5 to rise and fall is arranged in the equipment cabin 3. The pod 4 is connected or disconnected with the detection mechanism by the lifting of the winch.

[0027] When in use, the present invention uses the lifting rope 2 to send the sampling equipment and the detection equipment 1 as a whole into the well, and then suspends the equipment by the lifting rope 2 or supports the well wall with the fixed part to suspend the equipment statically in the sampling well, and the winch of the sampling equipment is used to lift or lower the cabin 4 to perform the sampling operation of the well water, and the water sample is connected to the detection equipment 1 by pulling the cabin 4 to complete the detection. The monitoring terminal is retained in the monitoring well, and the water body in the well can be sampled and detected at any time. The sampling path is short, the interference factors are few, the water sample quality is high, and it is helpful to improve the online monitoring level of groundwater.

[0028] Further, such as Figure 1 Figure 2 and Figure 3 As shown, a docking mechanism is also provided below the pod 4, and the docking mechanism includes a reducer 6, a flexible vertical component and a welcoming component, and the flexible vertical component includes an upper flange 7, a lower flange 8 and a coil spring 9 connected between the upper flange 7 and the lower flange 8, and the welcoming component includes a guide tube 10, a welcoming plate 11 and a docking cabin 12, and the welcoming plate 11 is an annular structure sleeved on the guide tube 10, and a recessed slide groove 13 is provided on the guide tube 10, and a protruding slider is provided on the inner ring side of the welcoming plate 11, and the slider extends into the slide groove 13 to form a sliding connection, and the lower end of the guide tube 10 is a spherical cap structure, and the upper end of the guide tube 10 is fixedly connected to the lower flange 8, and the docking cabin 12 is a hollow annular structure sleeved on the upper end of the guide tube 10.

[0029] like Figure 1 As shown, after the equipment is hung in the sampling well, the pod 4 may be crooked due to the influence of the well wall, the hanging rope 2, the center of gravity of the equipment, etc., and the guide tube 10 is bent by the spiral spring 9 to make the end of the guide tube 10 deviate in the vertical direction. When the pod 4 is sampled and hoisted, the guide tube 10 is along the vertical direction, which facilitates the docking of the annular pod 4 with the guide tube 10.

[0030] The receiving plate 11 has the freedom to slide along the guide tube 10. Therefore, when the pod 4 is inserted into the guide tube 10 and moves up along the guide tube 10, the pod 4 abuts against the receiving plate 11 and pushes the receiving plate 11 to move up together. The receiving plate 11 can prevent the pod 4 from shaking or twisting, thereby improving the lifting accuracy.

[0031] Further, such as Figure 2 As shown, the pod 4 is provided with a first inlet and outlet pipe 14 and a second inlet and outlet pipe 15, and the docking cabin 12 is provided with a first insertion hole 16 and a second insertion hole 17 which are plugged in with the first inlet and outlet pipe 14 and the second inlet and outlet pipe 15. The insertion sides of the first insertion hole 16 and the second insertion hole 17 are both in a trumpet-shaped structure. The first insertion hole 16 is connected to the detection equipment 1 by means of a sampling tube 18, and the second insertion hole 17 is connected to the external environment by means of an air filter element 19.

[0032] like Figure 2 As shown, when the pod 4 moves up, the first inlet and outlet pipe 14 is inserted into the first insertion hole 16, and the second inlet and outlet pipe 15 is inserted into the second insertion hole 17. When the sampling tube 18 connected to the first insertion hole 16 sucks the water sample in the pod 4, air is introduced with the help of the air filter element 19 connected to the second insertion hole 17, which plays a role in balancing the air pressure in the pod 4. At the same time, the first inlet and outlet pipe 14 and the second inlet and outlet pipe 15 are symmetrically arranged to balance the center of gravity and prevent the pod 4 from deflecting.

[0033] Furthermore, the hanging rope 5 is provided with two groups and passes through the flange holes of the upper flange 7 and the lower flange 8 and forms a limit with the help of the flange holes. The receiving and sending plate 11 is also provided with a through hole for the hanging rope 5 to pass through. The receiving and sending plate 11 is also provided with a primary limit hole 20 with a larger aperture than the first inlet and outlet pipe 14 and the second inlet and outlet pipe 15. The first inlet and outlet pipe 14 and the second inlet and outlet pipe 15 have the freedom of insertion and extraction of the primary limit hole 20 with the help of tightening and loosening of the hanging rope 2.

[0034] By means of the through holes provided on the receiving plate 11, Figure 1 and Figure 3 As shown, the hanging ropes 5 symmetrically arranged on both sides of the pod 4 are limited, and when the welcoming plate 11 and the pod 4 are abutted, the first inlet and outlet pipes 14 and the second inlet and outlet pipes 15 are limited by the hanging ropes 5, so that the limiting holes 20 are aligned and inserted, and the pod 4 is further limited by means of this plug-in fit to ensure that it can be successfully plugged into the first insertion hole 16 and the second insertion hole 17 set on the docking cabin 12.

[0035] Further, such as Figure 1 and Figure 5 As shown, the fixing part includes a core barrel 21, a waste liquid barrel 22 and a fixing component arranged on the outer wall of the core barrel 21, the fixing component includes a plurality of posting plates 23 arranged around the core barrel 21, a lifting component is arranged between the posting plates 23 and the core barrel 21, the lifting component includes a wedge block 24 arranged on the outer wall of the core barrel 21 and a sliding sleeve 25 arranged on the inner side of the posting plate 23 and slidingly matched with the wedge block 24, the lower end of the wedge block 24 faces the downhole direction, the lifting component also includes a sliding flange 26 mounted on the upper end of the core barrel 21, the lower side of the sliding flange 26 is hingedly connected to the posting plate 23 by means of a traction arm 27, and the posting plate 23 slides along the lifting direction of the wedge block 24 by the pulling of the sliding flange 26.

[0036] During the hoisting of the present invention, the sliding flange 26 is connected to the control rope. When the hoisting rope 2 is lowered into place, the control rope is pulled to move the sliding flange 26 along the core barrel 21. The sliding flange 26 pulls the traction arm 27 to drive the posting plate 23 to be lifted along the wedge block 24, so that the posting plate 23 expands relative to the core barrel 21 and abuts against the well wall. Due to the friction provided by the well wall and the lower end of the wedge block 24 being arranged toward the downhole direction, when the core barrel 21 tends to move downward under the action of its own weight, the posting plate 23 will further press the well wall to prevent the core barrel 21 from falling. When it is necessary to evacuate the equipment, the hoisting rope 2 is directly pulled to move the core barrel 21 upward relative to the posting plate 23. Figure 5 The middle core tube 21 moves rightward relative to the posting plate 23, so that the posting plate 23 is close to the core tube 21 again, thereby reducing the outer diameter surrounded by the posting plate 23 and detaching from the well wall, and continuing to pull the lifting rope 2 to withdraw the equipment.

[0037] Further, such as Figure 5 and Figure 6 As shown, a positioning plug plate 28 is also provided on the poster board 23, a limiting hole is provided on the poster board 23, the positioning plug plate 28 is arranged in the limiting hole, the positioning plug plate 28 is L-shaped and its angled end is hinged to the side wall of the limiting hole, the plug plate portion of the positioning plug plate 28 is flush with the surface of the poster board 23, an oblong hole is provided at the connecting portion of the positioning plug plate 28, a limiting pin 29 is provided on the outer wall of the core tube 21, the connecting portion of the positioning plug plate 28 forms a sliding connection with the limiting pin 29 by means of its oblong hole, and the positioning plug plate 28 has the freedom to swing up or close from the poster board 23 by means of the movement of the poster board 23.

[0038] When the posting plate 23 expands outward, as Figure 6 In the lower middle figure, the positioning plug plate 28 is opened and inserted into the soil of the well wall, which increases the adhesion of the posting plate 23. In addition, since the plate-like structure of the posting plate 23 is in contact with the well wall as a whole, the local density of the well wall is improved, which prevents a large amount of sand from falling after the positioning plug plate 28 is inserted, thereby contaminating the groundwater in the well and preventing interference with sampling.

[0039] Further, such as Figure 1 As shown, the waste liquid cylinder 22 is connected between the core cylinder 21 and the equipment cabin 3, and the core cylinder 21 and the waste liquid cylinder 22 are both hollow cylindrical structures. The upper end of the core cylinder 21 is provided with an injection port 30, and the side wall of the lower end of the core cylinder 21 is provided with a clean water output port 31, the lower end of the waste liquid cylinder 22 is provided with a waste liquid input port 32, and the upper end of the waste liquid cylinder 22 is provided with an air pressure balance port 33, the clean water output port 31 is connected with the clean water flushing side of the detection equipment 1 by means of a clean water pump, and the waste water side of the detection equipment 1 is connected with the waste liquid input port 32 of the waste liquid cylinder 22 by means of a waste liquid pump.

[0040] A clean water pump and a waste liquid pump are also provided in the equipment cabin 3 shown, wherein the detection chamber of the detection equipment 1 is connected to the core barrel 21 by means of the clean water pump, and the core barrel 21 is pre-filled with clean water for cleaning, and the detection chamber is connected to the waste liquid barrel 22 by means of the waste liquid pump, wherein the waste liquid barrel 22 is pre-empty.

[0041] The first inlet and outlet pipe 14 is connected in series with a first switch valve, and the second inlet and outlet pipe 15 is connected in series with a second switch valve.

[0042] When sampling, the first switch valve and the second switch valve in the pod 4 are closed, so that the pod 4 is closed, and the winch is started to lower the pod 4 to a preset depth; after the water body stabilizes for a while, the first switch valve and the second switch valve are opened to allow the water to flow into the pod 4, and after a certain delay, the first switch valve and the second switch valve are closed after the water body stabilizes again, and the sampling is completed;

[0043] Then the winch reverses, the pod 4 floats up and passes into the guide tube 10, then the pick-up plate 11 is lifted up, the first inlet and outlet pipe 14 and the second inlet and outlet pipe 15 are plugged into the corresponding holes of the pick-up plate 11, and the preliminary positioning of the pod 4 is realized. The pod 4 is continuously pulled up until the first inlet and outlet pipe 14 and the second inlet and outlet pipe 15 are inserted into the corresponding holes of the docking cabin 12. At this time, the pick-up plate 11 is clamped between the pod 4 and the docking cabin 12. When the pod 4 needs to be lowered next time, the pick-up plate 11 acts as a counterweight to pull the first inlet and outlet pipe 14 and the second inlet and outlet pipe 15 out of the docking cabin 12.

[0044] Then the first switch valve and the second switch valve are opened, and the delivery pump is started to pump the water sample into the detection chamber; after the detection is completed, the detection results are transmitted back to the monitoring terminal at the wellhead through cables or wirelessly, and the monitoring terminal is then transmitted back to the background server to complete the summary, and this monitoring equipment can be set in multiple monitoring wells in the monitoring area to achieve continuous monitoring of multiple points in space;

[0045] When the detection chamber completes the detection, the waste liquid pump is started to pump the waste liquid into the waste liquid cylinder 22, and then the clean water pump sends clean water for flushing into the detection chamber, and the clean water for flushing then passes through the waste liquid pump into the waste liquid cylinder 22;

[0046] When it is necessary to clean the pod 4, the clean water pump can be started to pump water into the cleaned detection chamber. Since the equipment cabin 3 is located above the pod 4, by opening the bypass switch valve connected in parallel to the two ends of the delivery pump, the clean water for flushing flows into the pod 4 under the action of gravity, and then by closing the bypass switch valve and starting the delivery pump, the clean water for flushing is discharged into the waste liquid cylinder 22 through the detection chamber. Since the delivery pump and the bypass switch valve are connected in parallel, one is opened and the other is closed during use.

[0047] Further, such as Figure 4 As shown, a lifting lug 34 is also provided at the end of the core tube 21 , and the lifting rope 2 is bound and connected to the lifting lug 34 .

Claims

1. An online multi-point continuous monitoring system for groundwater, comprising a detection device (1), a sampling device and a monitoring terminal, wherein the sampling device is arranged in a groundwater sampling well for collecting water samples, the detection device (1) detects the collected water samples and sends the detection results to the monitoring terminal, and the sampling device is sent into the well by means of a suspension rope (2), characterized in that: The sampling device comprises a fixing part connected to a hanging rope (2) and a sampling mechanism, an equipment cabin (3) is arranged below the fixing part, the detection device (1) is placed in the equipment cabin (3), the sampling mechanism comprises a pod (4) and a hanging rope (5), the pod (4) is suspended below the equipment cabin (3) by means of the hanging rope (5), a winch for driving the hanging rope (5) to rise and fall is arranged in the equipment cabin (3), and the pod (4) is connected or disconnected with the detection mechanism by means of the lifting of the winch.

2. The groundwater online multi-point continuous monitoring system according to claim 1 is characterized by: A docking mechanism is also provided below the pod (4), the docking mechanism comprising a reducer (6), a flexible vertical component and a receiving component, the flexible vertical component comprising an upper flange (7), a lower flange (8) and a coil spring (9) connected between the upper flange (7) and the lower flange (8), the receiving component comprising a guide tube (10), a receiving plate (11) and a docking cabin (12), the receiving plate (11) being an annular structure sleeved on the guide tube (10), the guide tube (10) being provided with A recessed slide groove (13), a protruding slider is arranged on the inner ring side of the receiving plate (11), and the slider extends into the slide groove (13) to form a sliding connection. The lower end of the guide tube (10) is a ball cap structure, and the upper end of the guide tube (10) is fixedly connected with the lower flange (8). The docking cabin (12) is a hollow ring structure and is mounted on the upper end of the guide tube (10). The guide tube (10) is bent by a coil spring (9) so that the end of the guide tube (10) is offset in the vertical direction.

3. The groundwater online multi-point continuous monitoring system according to claim 2 is characterized by: The pod (4) is provided with a first inlet and outlet pipe (14) and a second inlet and outlet pipe (15); the docking pod (12) is provided with a first insertion hole (16) and a second insertion hole (17) which are plug-fitted with the first inlet and outlet pipe (14) and the second inlet and outlet pipe (15); the insertion sides of the first insertion hole (16) and the second insertion hole (17) are both in a bell-shaped structure; the first insertion hole (16) is connected to the detection device (1) by means of a sampling tube (18); and the second insertion hole (17) is in communication with the external environment by means of an air filter element (19).

4. The groundwater online multi-point continuous monitoring system according to claim 2 is characterized by: The hanging rope (5) is provided in two groups and passes through the flange holes of the upper flange (7) and the lower flange (8) and forms a limit with the help of the flange holes. The receiving and sending plate (11) is also provided with a through hole for the hanging rope (5) to pass through. The receiving and sending plate (11) is also provided with a primary limit hole (20) with a hole diameter larger than the first inlet and outlet pipe (14) and the second inlet and outlet pipe (15). The first inlet and outlet pipe (14) and the second inlet and outlet pipe (15) have the freedom to insert and withdraw from the primary limit hole (20) by tightening and loosening the hanging rope (2).

5. The groundwater online multi-point continuous monitoring system according to claim 1 is characterized by: The fixing part comprises a core barrel (21), a waste liquid barrel (22) and a fixing assembly arranged on the outer wall of the core barrel (21); the fixing assembly comprises a plurality of posting plates (23) arranged around the core barrel (21); a lifting assembly is arranged between the posting plates (23) and the core barrel (21); the lifting assembly comprises a wedge block (24) arranged on the outer wall of the core barrel (21) and a sliding sleeve (25) arranged on the inner side of the posting plates (23) and slidably matched with the wedge block (24); the lower end of the wedge block (24) faces the downhole direction; the lifting assembly also comprises a sliding flange (26) sleeved on the upper end of the core barrel (21); the lower side of the sliding flange (26) is hingedly connected to the posting plates (23) by means of a traction arm (27); the posting plates (23) slide along the lifting direction of the wedge block (24) by means of the pulling of the sliding flange (26).

6. The groundwater online multi-point continuous monitoring system according to claim 5 is characterized by: The posting board (23) is also provided with a positioning plug plate (28), a limiting hole is provided on the posting board (23), the positioning plug plate (28) is arranged in the limiting hole, the positioning plug plate (28) is L-shaped and its angled end is hinged to the side wall of the limiting hole, the plug plate portion of the positioning plug plate (28) is flush with the surface of the posting board (23), the connecting portion of the positioning plug plate (28) is provided with an oblong hole, the outer wall of the core tube (21) is provided with a limiting pin (29), the connecting portion of the positioning plug plate (28) is slidably connected with the limiting pin (29) by means of the oblong hole, and the positioning plug plate (28) has the freedom of swinging to be lifted up or closed from the posting board (23) by means of the movement of the posting board (23).

7. The groundwater online multi-point continuous monitoring system according to claim 5 is characterized by: The waste liquid cylinder (22) is connected between the core cylinder (21) and the equipment cabin (3); the core cylinder (21) and the waste liquid cylinder (22) are both hollow cylindrical structures; an injection port (30) is provided at the upper end of the core cylinder (21); a clean water output port (31) is provided at the side wall of the lower end of the core cylinder (21); a waste liquid input port (32) is provided at the lower end of the waste liquid cylinder (22); an air pressure balance port (33) is provided at the upper end of the waste liquid cylinder (22); the clean water output port (31) is connected to the clean water flushing side of the detection equipment (1) by means of a clean water pump; and the waste water side of the detection equipment (1) is connected to the waste liquid input port (32) of the waste liquid cylinder (22) by means of a waste liquid pump.

8. The groundwater online multi-point continuous monitoring system according to claim 5 is characterized by: The end of the core tube (21) is also provided with a lifting ear (34), and the lifting rope (2) is tied and connected to the lifting ear (34).

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