Underground water level sensing device for hydrogeological exploration

Abstract

The invention discloses a hydrogeological exploration underground water level sensing device, and relates to the field of underground water monitoring, the hydrogeological exploration underground water level sensing device comprises a detection block and a top block, the detection block is located below the top block, the inner top of the top block is uniformly provided with four cavities and three connecting cavities, the three connecting cavities are located among the four cavities and are communicated with each other, and the four cavities are communicated with the top block. Rotating shafts are rotationally installed in the four cavities correspondingly, binding belts are wound on the four rotating shafts correspondingly, communicating through grooves are formed in the positions, located in the cavities, of the outer wall of the top block correspondingly, the four rotating shafts are connected through winding assemblies, and abutting supporting assemblies are arranged at the positions, located in the four binding belts, of the outer wall of the top block correspondingly; by means of the exploratory well protection device, stripping of loose rock strata and expansion of small cracks can be effectively restrained, a flexible protection barrier is constructed for the well wall, hard friction and impact of a traditional rigid assembly are replaced with flexible contact, the original structure of the exploratory well can be protected, and the exploratory well protection device is suitable for being used for the exploratory well. Therefore, synchronous propulsion of water level monitoring and well wall protection is realized.

Description

Technical Field

[0001] This invention relates to the technical field of groundwater monitoring, specifically a groundwater level sensing device for hydrogeological exploration. Background Technology

[0002] In hydrogeological exploration, accurately grasping the changes in groundwater level is of great significance for the scientific management of water resources, the effective prevention of geological disasters, and the sustainable protection of the ecological environment. Changes in groundwater level not only directly affect the rational development and utilization of regional water resources, but also profoundly influence the stability of the geological environment and the health of the ecosystem.

[0003] A groundwater level monitoring device for hydrogeological exploration described in the prior art includes a shell, a water level detection component, a fixing component, and a clamping component. The water level detection component is installed inside the shell, and the fixing component is fixedly installed on the outside of the shell.

[0004] While the aforementioned technology can fix the housing after the water level probe contacts the groundwater surface using a fixing component, thus ensuring the housing remains stably positioned near the water surface inside the monitoring tube and improving the stability of the device during detection, the housing is prone to tilting, jamming, or even hard collision with the well wall during the lifting and lowering process due to irregular shapes such as uneven well walls, fluid disturbances, or local protrusions or depressions in the well wall. This can cause falling gravel or rock debris to get stuck between the housing and the well wall, hindering further lifting and lowering of the housing and causing the device to jam and fail. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a groundwater level sensing device for hydrogeological exploration, so as to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A groundwater level sensing device for hydrogeological exploration includes a detection block and a top block. The detection block is located below the top block. The top of the top block has four chambers and three connecting chambers evenly distributed within its inner top. The three connecting chambers are located between and connected to the four chambers. A rotating shaft is rotatably installed in each of the four chambers. A strap is wound around each of the four rotating shafts. A through groove is formed on the outer wall of the top block at the chamber location. The ends of the four straps extend through the through grooves to the outside and are fixed with mounting plates. The four mounting plates are fixedly connected to the ground around the exploration well by bolts. The four rotating shafts are connected by a winding assembly, which is used to drive the four rotating shafts uniformly. The outer wall of the top block is provided with abutment support components at four straps. The four abutment support components are used to press the unfolded straps against the inner wall of the exploration well, forming a flexible support that generates a continuous and uniform radial preload on the well wall. In addition, the four abutment support components can also adaptively adjust the abutment degree according to the changes in the well wall when the top block moves up and down, ensuring the stability of the probe block in the exploration well.

[0007] Specifically, the winding assembly includes universal joints disposed in three connecting cavities. Both ends of the three universal joints are connected to the corresponding rotating shafts via couplings. A protective shell is fixed to the outer wall of the top block by screws. A drive motor is fixed to the inner wall of the protective shell by screws. A drive sprocket is fixedly sleeved on the outer wall of the output end of the drive motor.

[0008] Specifically, in this technical solution, a driven sprocket is fixedly sleeved on the outer wall of the shaft of one of the universal joints. The driving sprocket and the driven sprocket are connected by a transmission chain. The transmission chain passes through the wall of the top block and is slidably connected to the contact part. The driving sprocket and the driven sprocket have the same diameter.

[0009] Specifically, the inner core layer of the belt is made of high-strength aramid fiber bundles, the outer layer of the belt is covered with a wear-resistant polyurethane with a thickness of mm, and the outer layer of the belt facing the well wall is pressed with an anti-slip texture.

[0010] Specifically, each of the abutment support components includes two fixed seats and two diagonal braces. The two fixed seats are symmetrically welded to the bottom of the outer wall of the top block. The bottom ends of the two diagonal braces are rotatably connected to the corresponding fixed seats through pins. An abutment rod is fixed between the top ends of the two diagonal braces. The abutment rod is arc-shaped and located above the extended strap. Three rollers are movably sleeved on the outer wall of the abutment rod, and the outer walls of the three rollers abut against the outer wall of the strap.

[0011] Specifically, in this technical solution, a baffle is fixed between the two diagonal braces below the extended strap. The baffle is inclined along the diagonal braces, and a return spring is fixed between the baffle and the outer wall of the top block.

[0012] Specifically, in this technical solution, the top of the outer wall of the probe block is provided with an external thread, the bottom of the top block is provided with a sleeve groove, and the groove wall of the sleeve groove is provided with an internal thread that matches the external thread.

[0013] Specifically, in this technical solution, an annular airbag is bonded to the outer wall of the detector block. The airbag is made of highly elastic and wear-resistant rubber material, and the outer surface of the airbag is coated with an anti-corrosion coating. The lower surface of the top block is in close contact with the upper surface of the airbag.

[0014] Specifically, the bottom of the detection block is provided with an installation groove, a water level probe is installed inside the installation groove, a cable is connected to the top of the detection block, the bottom end of the cable passes through the detection block and is fixedly connected to the top end of the water level probe, and the top end of the cable is connected to a lifting machine for controlling the raising and lowering of the detection block.

[0015] Specifically, the top block has a slot, the outer wall of the cable is snapped into the slot, the slot wall is provided with an elastic rubber pad, and guide rods are rotatably installed above and below the cable tie in the four through slots.

[0016] In summary, the present invention has the following main beneficial effects: By driving four rotating shafts in a unified manner through the winding assembly, the belt can be simultaneously unfolded or wound up. When the probe block descends, the belt, under the action of the return spring of the support assembly, always generates a uniform radial preload on the well wall. This dynamic preload can effectively suppress the peeling of loose rock layers and the expansion of micro-cracks, building a flexible protective barrier for the well wall. Furthermore, the flexible contact between the belt and the well wall replaces the hard friction and impact of traditional rigid components, which can protect the original structure of the exploration well, thereby realizing the simultaneous advancement of water level monitoring and well wall protection. Meanwhile, the roller design that abuts against the support component reduces friction loss between the belt and the component. Combined with the wear-resistant composite material of the belt, it extends the service life of the core transmission components. The probe block and the top block can be detachably connected through the threaded structure and slot, which facilitates quick replacement and maintenance of the top block and reduces the overall maintenance cost of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the positive axis structure of the device of the present invention; Figure 2 This is a schematic diagram showing the separation of the probe block and the top block in this invention; Figure 3 This is a schematic diagram of the top cross-sectional structure of the top block of the present invention; Figure 4 This is a schematic diagram of the top cross-sectional structure of the top block of the present invention; Figure 5 This is a schematic diagram of the winding assembly and belt structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the abutment support component structure of the present invention.

[0018] Figure Descriptions: 1. Detector block; 101. Mounting slot; 102. Water level probe; 103. Airbag; 104. External thread; 2. Cable; 3. Top block; 301. Sleeve groove; 3011. Internal thread; 302. Slot; 303. Chamber; 3031. Connecting cavity; 3032. Through groove; 3033. Guide rod; 4. Rotating shaft; 401. Strap; 402. Mounting plate; 5. Abutment support assembly; 501. Fixed seat; 502. Diagonal brace; 503. Abutment rod; 504. Baffle; 505. Return spring; 506. Roller; 6. Rewinding assembly; 601. Universal joint; 602. Driven sprocket; 603. Drive motor; 604. Drive sprocket; 605. Transmission chain; 606. Protective shell. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] The embodiments of the present invention will now be described.

[0021] It should be noted that the water level probe 102 is electrically connected to the external controller via a cable. The cable 2 is responsible for both signal transmission and power supply. The water level data collected by the water level probe 102 is transmitted to the controller in real time. The drive motor 603 is independently powered and controlled to start and stop via the battery built into the top block and the control board. The control board is connected to the external controller via a wireless signal. The drive motor 603 has a built-in torque sensor, which is connected to the control board via a wire to provide real-time feedback on the tension of the belt 401. Furthermore, the hoist used to control the lifting and lowering of the probe block 1 adopts existing technology and is electrically connected to the controller. The controller synchronously adjusts the lifting and lowering speed of the hoist according to the operating status of the drive motor 603 to ensure that the winding and unwinding of the belt 401 is coordinated with the hoist's movement.

[0022] In this embodiment, please refer to Figure 1 - Figure 6As shown, a groundwater level sensing device for hydrogeological exploration includes a detection block 1 and a top block 3. The detection block 1 is located below the top block 3. The top of the outer wall of the detection block 1 is provided with an external thread 104. The bottom of the top block 3 is provided with a groove 301. The groove wall of the groove 301 is provided with an internal thread 3011 that matches the external thread 104. An annular airbag 103 is bonded to the outer wall of the detection block 1. The airbag 103 is made of highly elastic and wear-resistant rubber material, and the outer surface of the airbag 103 is coated with an anti-corrosion coating. The lower surface of the top block 3 is in close contact with the upper surface of the airbag 103. The bottom of the detection block 1 is provided with an installation groove 101, and a water level probe 102 is installed inside the installation groove 101. A cable 2 is connected to the top of the detection block 1. The bottom end of the cable 2 passes through the detection block 1 and is fixedly connected to the top end of the water level probe 102. The top end of the cable 2 is connected to a lifting machine for controlling the lifting and lowering of the detection block 1. A slot 302 is provided on the top block 3. The outer wall of the cable 2 is snapped into the slot 302. An elastic rubber pad is provided on the groove wall of the slot 302. A guide rod 3033 is rotatably installed above and below the strap 401 in the four through slots 3032. The top block 3 has four chambers 303 and three connecting chambers 3031 evenly distributed on its inner top. The three connecting chambers 3031 are all located between the four chambers 303 and are connected. A rotating shaft 4 is rotatably installed in each of the four chambers 303. A strap 401 is wound around each of the four rotating shafts 4. A through groove 3032 is opened on the outer wall of the top block 3 at the chambers 303. The ends of the four straps 401 extend through the through grooves 3032 to the outside and are fixed with mounting plates 402. The four mounting plates 402 are fixedly connected to the ground around the exploration well by bolts. The inner core layer of the strap 401 is made of high-strength aramid fiber bundles. The outer layer of the strap 401 is covered with a 3mm thick wear-resistant polyurethane. The outer layer of the strap 401 facing the well wall is pressed with an anti-slip texture. The four rotating shafts 4 are connected by a winding assembly 6. The winding assembly 6 is used to drive the four rotating shafts 4 in a unified manner. The winding assembly 6 includes universal shafts 601 disposed in three connecting cavities 3031. Both ends of the three universal shafts 601 are connected to the corresponding rotating shafts 4 via couplings. A protective shell 606 is fixed to the outer wall of the top block 3 by screws. A drive motor 603 is fixed to the inner wall of the protective shell 606 by screws. A drive sprocket 604 is fixedly sleeved on the outer wall of the output end of the drive motor 603. A driven sprocket 602 is fixedly sleeved on the outer wall of the shaft of one universal shaft 601. The drive sprocket 604 and the driven sprocket 602 are connected by a transmission chain 605. The transmission chain 605 passes through the wall of the top block 3 and is slidably connected to the contact part. The diameters of the drive sprocket 604 and the driven sprocket 602 are the same. The outer wall of the top block 3 is provided with abutment support components 5 at the four straps 401. The four abutment support components 5 are used to press the unfolded straps 401 against the inner wall of the exploration well, forming a flexible support to generate a continuous and uniform radial pre-tightening force on the well wall. In addition, the four abutment support components 5 can also adaptively adjust the abutment degree according to the changes in the well wall when the top block 3 moves up and down, so as to ensure the stability of the probe block 1 in the exploration well.

[0023] When performing groundwater level sensing, firstly, four mounting plates 402 are fixed to the ground around the exploration well with bolts to ensure that the four mounting plates 402 are evenly distributed in a ring. Then, the cable 2 is inserted into the slot 302 of the top block 3, so that the detector block 1 is screwed and fixed by the external thread 104 and the internal thread 3011 of the top block 3. At this time, the lower surface of the top block 3 is tightly attached to the airbag 103, completing the assembly of the detector block 1 and the top block 3. Next, the controller sends a signal to the control board to start the drive motor 603 in the winding assembly 6. The drive motor 603 outputs power and transmits it to the driven sprocket 602 through the active sprocket 604 and the transmission chain 605, which drives the corresponding universal shaft 601 to rotate. Through the linkage of the three universal shafts 601, the four rotating shafts 4 rotate synchronously and release the wound strap 4. The hoist lowers the cable 2 synchronously, and the detection block 1 and the top block 3 move down along the exploration well axis. During this process, the diagonal brace 502 in the abutment support assembly 5, under the action of the return spring 505, keeps the strap 401 pressed against the well wall, forming a uniform radial preload. When the well wall has irregular shapes such as protrusions and depressions, the return spring 505 adapts to the extension and retraction to adjust the size of the abutment force, ensuring that the strap 401 is always in contact with the well wall and preventing the detection block 1 from deflecting. When the probe block 1 descends to the point where the water level probe 102 contacts the groundwater surface, the water level probe 102 transmits the water level signal to the controller via cable 2. Upon receiving the signal, the controller stops the drive motor 603 and the hoist. At this time, the strap 401 maintains radial preload on the well wall under the action of the return spring 505, forming a flexible support to suppress the spalling of loose rock layers and the expansion of fractures in the well wall. After monitoring is completed, the controller controls the drive motor 603 to rotate in the opposite direction, driving the four rotating shafts 4 to synchronously wind up the strap 401 via the winding assembly 6. The hoist synchronously winds up the cable 2, driving the probe block 1 and the top block 3 upwards. As the belt 401 rises, the inclined support rod 502 in the support assembly 5 gradually approaches the top block 3 under the tension of the belt 401. The return spring 505 is compressed, but the roller 506 always maintains rolling contact with the outer wall of the belt 401 to reduce friction loss and ensure that the belt 401 can be smoothly wound up. At the same time, the guide rod 3033 guides the belt 401 to prevent the belt 401 from deviating or tangling during the winding process. When the detection block 1 and the top block 3 rise to the wellhead, the drive motor 603 and the hoist are turned off to complete one groundwater level sensing operation. Thus, as the probe block 1 descends, the strap 401, under the action of the support component 5, always generates a uniform radial preload on the well wall. This dynamic preload can effectively suppress the peeling of loose rock layers and the expansion of micro-cracks, building a flexible protective barrier for the well wall. Furthermore, the flexible contact between the strap 401 and the well wall replaces the hard friction and impact of traditional rigid components, which can protect the original structure of the exploration well, thereby achieving the simultaneous advancement of water level monitoring and well wall protection.

[0024] Please see Figure 2 , Figure 3 and Figure 7 As shown, each abutment support assembly 5 includes two fixed seats 501 and two diagonal braces 502. The two fixed seats 501 are symmetrically welded to the bottom of the outer wall of the top block 3. The bottom ends of the two diagonal braces 502 are rotatably connected to the corresponding fixed seats 501 through pins. An abutment rod 503 is fixed between the top ends of the two diagonal braces 502. The abutment rod 503 is arc-shaped and located above the extended strap 401. Three rollers 506 are movably sleeved on the outer wall of the abutment rod 503. The outer walls of the three rollers 506 abut against the outer wall of the strap 401. A baffle 504 is fixed between the two diagonal braces 502 below the extended strap 401. The baffle 504 is inclined along the diagonal braces 502. A return spring 505 is fixed between the baffle 504 and the outer wall of the top block 3.

[0025] During descent, the roller 506 of the abutment support assembly 5 rolls along the surface of the strap 401. The combined design of the baffle 504 and the return spring 505 allows the abutment support assembly 5 to adaptively adjust the tightness according to the actual condition of the well wall. When encountering a protrusion in the well wall, the return spring 505 is compressed, and the diagonal brace 502 drives the abutment rod 503 and the roller 506 to move closer to the top block 3, while still maintaining the tightness of the strap 401. When encountering a depression in the well wall, the return spring 505 returns to its original state, pushing the diagonal brace 502 to drive the abutment rod 503 and the roller 506 to move away from the top block 3, continuing to maintain the tightness of the strap 401, thereby ensuring that the strap 401 is always in close contact with the well wall, providing stable support for the probe block 1.

[0026] The working principle of this invention is as follows: When performing groundwater level sensing, firstly, four mounting plates 402 are fixed to the ground around the exploration well with bolts to ensure that the four mounting plates 402 are evenly distributed in a ring. Then, the cable 2 is inserted into the slot 302 of the top block 3, so that the detector block 1 is screwed and fixed by the external thread 104 and the internal thread 3011 of the top block 3. At this time, the lower surface of the top block 3 is tightly attached to the airbag 103, completing the assembly of the detector block 1 and the top block 3. Next, the controller sends a signal to the control board to start the drive motor 603 in the winding assembly 6. The drive motor 603 outputs power and transmits it to the driven sprocket 602 via the drive sprocket 604 and transmission chain 605, driving the corresponding universal joint 601 to rotate. Through the linkage of the three universal joints 601, the four rotating shafts 4 rotate synchronously, releasing the wound strap 4. The hoist lowers the cable 2 synchronously, and the probe block 1 and top block 3 move downward along the exploration well axis. During this process, the roller 506 abutting the support assembly 5 rolls along the surface of the strap 401. The combined design of the baffle 504 and the return spring 505 makes... The abutment support assembly 5 can adaptively adjust the abutment tightness according to the actual situation of the well wall. When encountering a protrusion in the well wall, the return spring 505 is compressed, and the diagonal brace 502 drives the abutment rod 503 and the roller 506 to move closer to the top block 3, but still maintains the abutment force on the strap 401. When encountering a depression in the well wall, the return spring 505 returns to its original state, pushing the diagonal brace 502 to drive the abutment rod 503 and the roller 506 to move away from the top block 3, and continue to maintain the abutment force on the strap 401, thereby ensuring that the strap 401 is always in close contact with the well wall, providing stable support for the probe block 1 and preventing the probe block 1 from tilting. When the probe block 1 descends to the point where the water level probe 102 contacts the groundwater surface, the water level probe 102 transmits the water level signal to the controller via cable 2. Upon receiving the signal, the controller stops the drive motor 603 and the hoist. At this time, the strap 401 maintains radial preload on the well wall under the action of the return spring 505, forming a flexible support to suppress the spalling of loose rock layers and the expansion of fractures in the well wall. After monitoring is completed, the controller controls the drive motor 603 to rotate in the opposite direction, driving the four rotating shafts 4 to synchronously wind up the strap 401 via the winding assembly 6. The hoist synchronously winds up the cable 2, driving the probe block 1 and the top block 3 upwards. As the belt 401 rises, the inclined support rod 502 in the support assembly 5 gradually approaches the top block 3 under the tension of the belt 401. The return spring 505 is compressed, but the roller 506 always maintains rolling contact with the outer wall of the belt 401 to reduce friction loss and ensure that the belt 401 can be smoothly wound up. At the same time, the guide rod 3033 guides the belt 401 to prevent the belt 401 from deviating or tangling during the winding process. When the detection block 1 and the top block 3 rise to the wellhead, the drive motor 603 and the hoist are turned off to complete one groundwater level sensing operation.

[0027] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A hydrogeological exploration groundwater level sensing device, comprising a detection block (1) and a top block (3), characterized in that, The detection block (1) is located below the top block (3), the inner top of the top block (3) is uniformly provided with four cavities (303) and three connecting cavities (3031), the three connecting cavities (3031) are located between the four cavities (303) and are connected, the four cavities (303) are all rotatably provided with rotating shafts (4), the four rotating shafts (4) are all wound with belts (401), the outer wall of the top block (3) is provided with communicating grooves (3032) at the cavities (303), the ends of the four belts (401) all extend to the outside through the grooves (3032) and are fixed with mounting plates (402), the four mounting plates (402) are all fixedly connected with the ground around the exploration well through bolts, the four rotating shafts (4) are connected through winding assemblies (6), and the winding assemblies (6) are used for uniformly driving the four rotating shafts (4). The outer wall of the top block (3) is provided with abutting supporting assemblies (5) at the four belts (401), the four abutting supporting assemblies (5) are used for abutting the unfolded belts (401) against the inner wall of the exploration well, forming a flexible support and generating a continuous and uniform radial pre-tightening force on the well wall, and the four abutting supporting assemblies (5) can also adaptively adjust the abutting degree when the top block (3) moves up and down, so as to ensure the stability of the detection block (1) in the exploration well.

2. The groundwater level sensing device according to claim 1, wherein The winding assembly (6) comprises universal shafts (601) arranged in the three connecting cavities (3031), both ends of the three universal shafts (601) are connected with the corresponding rotating shafts (4) through couplings, the outer wall of the top block (3) is fixedly provided with a protective shell (606) through screws, the inner wall of the protective shell (606) is fixedly provided with a driving motor (603) through screws, and the output end of the driving motor (603) is fixedly provided with a driving sprocket (604).

3. The groundwater level sensing device according to claim 2, wherein The outer wall of the shaft rod of one universal shaft (601) is fixedly provided with a driven sprocket (602), the driving sprocket (604) and the driven sprocket (602) are drivingly connected through a transmission chain (605), the transmission chain (605) penetrates the wall of the top block (3) and is slidingly connected with the contact part, and the driving sprocket (604) and the driven sprocket (602) have the same diameter.

4. The groundwater level sensing device according to claim 1, wherein The inner core layer of the belt (401) is made of high-strength aramid fiber bundle, the outer layer of the belt (401) is covered with 3mm-thick wear-resistant polyurethane, and the outer layer of one side of the belt (401) facing the well wall is pressed with anti-skid texture.

5. The groundwater level sensing device according to claim 1, wherein Each abutting support assembly (5) comprises two fixed seats (501) and two inclined struts (502), the two fixed seats (501) are symmetrically welded at the bottom of the outer wall of the top block (3), the bottom ends of the two inclined struts (502) are rotatably connected with the corresponding fixed seats (501) through the pin shafts, the top ends of the two inclined struts (502) are fixedly connected with the abutting rod (503) therebetween, the abutting rod (503) is arranged in an arc shape, the abutting rod (503) is located above the extended belt (401), the outer wall of the abutting rod (503) movably sheathes three rollers (506), and the outer walls of the three rollers (506) are in abutment with the outer wall of the extended belt (401).

6. The groundwater level sensing device according to claim 5, wherein A baffle (504) is fixedly arranged between the two inclined struts (502) and below the extended belt (401), the baffle (504) is arranged obliquely along the inclined struts (502), and the baffle (504) is fixedly connected with the outer wall of the top block (3) and the reset spring (505).

7. The groundwater level sensing device of claim 1, wherein, The outer wall of the detection block (1) is provided with external threads (104), and the bottom of the top block (3) is provided with a sleeve groove (301), and the groove wall of the sleeve groove (301) is provided with internal threads (3011) matched with the external threads (104).

8. The groundwater level sensing device of claim 1, wherein, The outer wall of the detection block (1) is bonded with an annular air bag (103), the air bag (103) is made of high-elastic and wear-resistant rubber material, and the outer surface of the air bag (103) is coated with an anti-corrosion coating, and the lower surface of the top block (3) is in close contact with the upper surface of the air bag (103).

9. The groundwater level sensing device of claim 1, wherein, The bottom of the detection block (1) is provided with a mounting groove (101), and the water level probe (102) is mounted in the mounting groove (101), the top of the detection block (1) is connected with a cable (2), the bottom end of the cable (2) penetrates the detection block (1) and is fixedly connected with the top end of the water level probe (102), and the top end of the cable (2) is connected with a lifting machine for controlling the lifting of the detection block (1).

10. The groundwater level sensing device of claim 9, wherein, The top block (3) is provided with a clamping groove (302), the outer wall of the cable (2) is clamped in the clamping groove (302), the groove wall of the clamping groove (302) is provided with an elastic rubber pad, and the guide rods (3033) are rotatably installed above and below the belt (401) in the four through grooves (3032).

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