Underground water level measuring device

Abstract

The invention discloses an underground water level measuring device which comprises a controller and a detection box installed on an observation well, a water supplementing mechanism, a laser detection mechanism and a flushing control mechanism are arranged in the detection box, the water supplementing mechanism is connected with the controller, and the water pumping end of the water supplementing mechanism extends and is immersed in underground water; the laser detection mechanism comprises a sealing cover, a core cylinder, a laser water level gauge and a reflection floating body, the sealing cover is fixedly installed at the bottom of the detection box above the observation well, the core cylinder is fixedly installed at the bottom of the interior of the sealing cover, the core cylinder extends downwards into the observation well and is provided with a detection pipe, the bottom end of the detection pipe is downwards immersed in underground water, and the laser water level gauge is arranged in the detection pipe. A floating body communicating vessel is mounted; the underground water level measuring device is unique in structure and ingenious in design, the underground water level measuring device is high in precision, automatic and self-cleaning, the laser detection system and the blowdown system are integrated, the underground water level measuring device adapts to complex environments, long-term stable operation is guaranteed, and the data detection accuracy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of groundwater detection, and particularly relates to a groundwater level measuring device. Background Art

[0002] Groundwater is widely distributed in every corner of the earth. It not only provides an important water source for agricultural irrigation, industrial water use and residential life, but also plays an irreplaceable role in maintaining ecological balance. With the intensification of the impact of global climate change and human activities, groundwater resources are facing unprecedented challenges, such as overexploitation, pollution and other problems. Therefore, accurately monitoring the change of groundwater level is of crucial significance for evaluating the water resource situation, predicting the water supply capacity, protecting the ecological environment and formulating reasonable water resource management policies. Regular and accurate groundwater level measurement can help us understand the changing trend of groundwater resources and take timely measures to address potential problems.

[0003] Groundwater level measurement usually uses observation wells to detect the groundwater level by using a pressure water level gauge or a laser water level gauge. The pressure water level gauge is a contact-type water level monitoring device that calculates the water level depth by measuring the water pressure. However, due to the complex underground water environment, sediment and debris in the water body will block the pressure probe, resulting in inaccurate measurement results. Although the laser water level gauge is a non-contact measurement device that measures the water surface distance by emitting a laser beam and receiving the reflection from the water surface, avoiding direct contact with the water surface and reducing the influence of floating objects on the measurement, the laser water level gauge is still easily affected by floating objects in the water body because the floating objects may be mistaken for the water surface, resulting in inaccurate data. Summary of the Invention

[0004] Aiming at the defects and problems existing in the existing groundwater level measurement, the present invention provides a groundwater level measuring device with a unique structure and ingenious design, aiming to provide a high-precision, automated and self-cleaning groundwater level measuring device. By integrating a laser detection and sewage discharge system, it can adapt to complex environments, ensure long-term stable operation, and improve the accuracy of data detection.

[0005] The solution adopted by the present invention to solve its technical problems is as follows: A groundwater level measuring device includes a controller and a detection box installed on an observation well. A water replenishing mechanism, a laser detection mechanism, and a flushing control mechanism are provided in the detection box. The water replenishing mechanism is connected to the controller, and the pumping end of the water replenishing mechanism extends and is immersed in the groundwater. The laser detection mechanism includes a sealing cover, a core tube, a laser water level detector, and a reflection float. The sealing cover is fixedly installed on the bottom of the detection box above the observation well. The core tube is fixedly installed on the bottom of the box inside the sealing cover. The core tube extends downward into the observation well and is provided with a detection tube. The bottom end of the detection tube extends downward and is immersed in the groundwater, and a float connector is installed. The reflection float is fitted and installed in the detection tube. The laser water level detector is fitted and installed at the top end of the core tube and is connected to the controller for detecting the height of the reflection float. The flushing control mechanism includes a drain pipe vertically installed on the bottom of the box. A drain valve connected to the controller is fitted and installed at the top of the drain pipe. The bottom end of the drain pipe extends downward into the observation well and communicates with the core tube. A breathing valve is fitted and installed at the bottom end of the drain pipe.

[0006] The detection box includes a cover plate and a box body. The cover plate is fitted and installed at the wellhead of the observation well. The box body is fitted and installed on the cover plate and combines with the cover plate to form a water tank for storing water. The water replenishing mechanism, the laser detection mechanism, and the flushing control mechanism are all fitted and installed on the cover plate inside the box body.

[0007] The water replenishing mechanism includes a water pump box fixedly installed in the detection box. A water pump connected to the controller is fitted and installed in the water pump box. The pumping end of the water pump is fitted and connected with a water suction pipe. The other end of the water suction pipe passes through the bottom of the water pump box and the detection box, extends through the observation well, and is immersed in the groundwater. The drainage end of the water pump is fitted and connected with a water supply pipe. The other end of the water supply pipe extends upward through the water pump box and into the detection box. A water level sensor connected to the controller is fitted and installed in the detection box.

[0008] A cage is fitted and installed at one end of the water suction pipe immersed in the groundwater.

[0009] Limit frames are fitted and installed inside both the bottom end and the top end of the detection tube.

[0010] The float connector includes a connector housing, a partition board, and a combined piston. The connector housing is installed at the bottom of the detection tube. The partition board is fitted and installed inside the connector housing and horizontally divides the internal space of the connector housing into a side cavity and a piston cavity. A drain hole penetrating the housing is provided at the bottom of the piston cavity, and a one-way drain valve is fitted and installed in the drain hole. Strip-shaped communication holes and upward floating holes communicating with the side cavity are vertically spaced on the partition board. A communication hole penetrating the housing is provided on the cavity wall of the piston cavity facing the partition board. The combined piston is fitted and installed in the piston cavity, and under the action of the buoyancy of the water body, the combined piston will move along the inner wall of the piston cavity to control the opening and closing of the communication hole and the on-off of the strip-shaped communication hole and the piston cavity above the combined piston.

[0011] The combined piston includes a wing plate and a floating piston. A plate retaining platform is arranged on the partition between the strip-shaped communication hole and the upper floating hole in the piston cavity in a matching manner. The wing plate is slidably installed vertically on the partition above the plate retaining platform to block and seal the strip-shaped communication hole. And a side hole that always overlaps and communicates with the strip-shaped communication hole is arranged on the partition. The floating piston is installed in the piston cavity on the side of the wing plate away from the partition and is in contact with the wing plate, combining to form a complete piston body. The floating piston can drive the wing plate that has not slid to the limit position to slide synchronously. A connecting channel is arranged in the floating body in a matching manner. The liquid inlet of the connecting channel is located on the upper end face of the floating piston, and the liquid outlet of the connecting channel is located at one end of the floating piston facing the wing plate and is arranged in a matching manner with the side hole.

[0012] The laser water level detector includes a water level detector housing and a laser water level detector body. The water level detector housing is installed at the top of the core barrel in a matching manner and communicates with the internal channel of the core barrel. The laser water level detector body is fixedly installed in the water level detector housing and is connected to the controller. The reflection floating body includes a floating body block placed in the detection tube, and a laser reflection coating is arranged outside the floating body block.

[0013] Advantages of the present invention: Compared with the prior art, the groundwater level measuring device provided by the present invention has the following advantages: 1. The groundwater level measuring device provided by the present invention measures the water level through the laser water level detector and the reflection floating body in the laser detection mechanism, avoiding the influence of floating objects that may be encountered in the traditional method on the measurement result. The reflection floating body is specially designed with a laser reflection coating to ensure that only the laser pulses reflected by the reflection floating body are received by the laser water level detector, improving the accuracy and reliability of the measurement.

[0014] 2. The entire measurement process of the groundwater level measuring device provided by the present invention is automatically controlled by the controller, including steps such as water replenishment, drainage, flushing, and water level measurement, reducing manual intervention, improving work efficiency, and being able to achieve automatic measurement at regular intervals or on demand to meet the requirements of different application scenarios.

[0015] 3. For the groundwater level measurement provided by the present invention, water is filled into the top detection box through the water replenishment mechanism, and gravity is used for pressurized drainage. The discharge of the water body in the detection box is controlled through the holes of the flushing control mechanism, so that the detection tube and the reflection floating body can be automatically cleaned before and after each measurement, preventing impurity accumulation from affecting the measurement accuracy and also extending the service life of the equipment.

[0016] 4. The groundwater level measurement provided by the present invention can precisely control the direction and flow rate of water through the combined piston inside. When the water in the detection box is drained into the observation well, the composite piston automatically adjusts its position according to the water pressure, opening or closing the communication holes to ensure smooth drainage of water and effectively cleaning the detection tube and its internal structure. This design effectively prevents sediment and other impurities from entering the detection tube, reducing the risk of equipment blockage caused by sediment. Especially in the case of high sediment content in groundwater, this anti-blocking function is particularly important, ensuring the long-term stable operation of the measurement system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention.

[0018] Figure 2 is a schematic structural diagram of the detection box of the present invention.

[0019] Figure 3 is a schematic internal structure diagram of the detection tube of the present invention.

[0020] Figure 4 is a schematic three-dimensional structure diagram of the communicating vessel of the present invention.

[0021] Figure 5 is a schematic structural diagram of the outer shell of the communicating vessel of the present invention.

[0022] Figure 6 is a schematic structural diagram of the combined piston of the communicating vessel of the present invention.

[0023] Figure 7 is a schematic diagram of the moving process of the internal combined piston of the communicating vessel of the present invention.

[0024] Reference numerals in the figures: 1 is the observation well, 2 is the detection box, 21 is the cover plate, 22 is the box body, 3 is the flushing control mechanism, 31 is the drain pipe, 32 is the drain valve, 33 is the breathing valve, 24 is the mesh cover, 4 is the water replenishing mechanism, 41 is the water pump box, 42 is the water pump, 43 is the suction pipe, 44 is the water supply pipe, 45 is the wire cage, 5 is the floating body communicating vessel, 51 is the outer shell of the communicating vessel, 511 is the side cavity, 512 is the piston cavity, 513 is the communication hole, 52 is the partition plate, 521 is the strip-shaped communication hole, 522 is the upward floating hole, 53 is the wing plate, 531 is the side hole, 54 is the floating body piston, 541 is the connecting channel, 55 is the one-way drain valve, 56 is the plate blocking platform, 57 is the piston limiting block, 6 is the laser detection mechanism, 61 is the sealing cover, 62 is the core cylinder, 621 is the internal thread sleeve, 63 is the laser water level gauge, 64 is the reflecting floating body, 65 is the detection tube, 66 is the limiting frame. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will be further described below in conjunction with the drawings and embodiments. Embodiment

[0026] In view of the problems raised in the above background art, the present embodiment provides a groundwater level measuring device, as Figure 1-7 shown, which includes a controller and a detection box 2 installed on the observation well 1. A water replenishing mechanism 4, a laser detection mechanism 6, and a flushing control mechanism 3 are correspondingly installed in the detection box 2. The detection box 2 includes a cover plate 21 and a box body 22. The cover plate is correspondingly installed at the wellhead of the observation well 1. A breathing hole is correspondingly provided on the cover plate to maintain the air pressure balance inside and outside the well. A breathable waterproof material, such as a breathable film, is correspondingly provided on the breathing hole of the cover plate, allowing air to circulate but preventing moisture and other particulate matters from entering; the box body is correspondingly installed on the cover plate and combined with the cover plate to form a water tank for storing water. The water replenishing mechanism, the laser detection mechanism, and the flushing control mechanism are all correspondingly installed on the cover plate inside the box body.

[0027] The water replenishing mechanism 4 is connected to the controller, and the pumping end of the water replenishing mechanism 4 passes through the cover plate and extends into the groundwater through the observation well, as Figure 2 shown. The water replenishing mechanism includes a water pump box 41 fixedly installed at the bottom of the detection box. A water pump 42 connected to the controller is correspondingly installed in the water pump box 41. The pumping end of the water pump 42 is correspondingly connected to a water suction pipe 43. The other end of the water suction pipe 43 passes through the side wall of the water pump box and the bottom of the detection box and extends into the groundwater through the observation well. The outer wall of the water suction pipe is sealed with the side wall of the water pump box and the bottom of the detection box, so that during use, the water in the detection box can be effectively prevented from flowing into the water pump box or the observation well; the drainage end of the water pump is correspondingly connected to a water supply pipe 44. The other end of the water supply pipe extends upward through the water pump box into the water tank. A water level sensor connected to the controller is correspondingly installed in the detection box to detect the liquid height in the detection box. The controller can control the water pump to quantitatively inject groundwater into the detection box according to the liquid height detected by the water level sensor.

[0028] The laser detection mechanism 6 includes a sealing cover 61, a core tube 62, a laser water level gauge 63, and a reflection float 64. The sealing cover 61 is correspondingly fixedly installed at the bottom of the detection box above the observation well, sealing and separating the space inside the sealing cover 61 from the space inside the detection box; the core tube 62 is fixedly installed at the bottom of the sealing cover, and the core tube extends downward into the observation well and is provided with a detection tube 65. The bottom end of the detection tube is immersed downward in the groundwater and is provided with a float connector 5. Specifically: As Figure 2 shown, an installation hole is provided coaxially in the vertical direction at the bottom of the detection box inside the sealing cover 61. The core tube is correspondingly fixedly installed in the installation hole, and the bottom end of the core tube extends downward into the observation well and is coaxially provided with a detection tube. There are various connection methods between the core tube and the detection tube. For example: an internal thread sleeve 621 is correspondingly provided coaxially at the bottom end of the core tube, and an external thread matching the internal thread sleeve is provided at the top end of the detection tube, and the detection tube is correspondingly threadedly sleeved in the internal thread sleeve at the bottom end of the core tube, so as to be fixedly connected to the core tube.

[0029] The reflective floating body 64 is fitted and installed in the detection tube, and the laser water level gauge 63 is fitted and installed at the top of the core barrel and connected to the controller for detecting the height of the reflective floating body. Specifically: As Figure 2 and Figure 3 shown, the laser water level gauge 63 includes a water level gauge housing and a laser water level gauge body. The water level gauge housing is fitted and installed at the top of the core barrel, communicates with the internal channel of the core barrel, and seals the top opening of the core barrel; the laser water level gauge body is fixedly installed in the water level gauge housing and connected to the controller; the reflective floating body 64 includes a floating body block placed in the detection tube, and the floating body block does not affect the liquid flow in the detection tube; a laser reflection coating is provided outside the floating body block for reflecting the laser pulse emitted by the laser water level gauge body. After the laser water level gauge body receives the laser pulse reflected by the reflective floating body, by measuring the time difference between the laser emission and the received reflected light (time-of-flight method), the distance to the water surface can be calculated. The laser water level gauge body calculates the accurate water level height based on the above time difference and other calibration parameters and sends the result to the controller.

[0030] Further, limit frames 66 are fitted and installed at both the bottom end and the top end inside the detection tube 65 to intercept the floating body block without affecting the water flow and prevent it from being discharged from the detection tube under the impact of the water flow. There are various types of limit frames. In this embodiment, the limit frame includes an outer ring fixedly sleeved in the detection tube, an inner ring coaxially arranged inside the outer ring, the inner diameter of the inner ring is smaller than the diameter of the reflective floating body, and a plurality of connecting rods are evenly spaced along the circumferential direction on the outer ring surface of the inner ring, and the other ends of the connecting rods are fixedly connected to the inner ring surface of the outer ring.

[0031] As Figure 4 and Figure 5 shown, the floating body communicating vessel 5 includes a communicating vessel housing 51, a partition plate 52 and a combined piston. The communicating vessel housing 51 is installed at the bottom of the detection tube 65 and communicates with the detection tube. There are various ways to fixedly install the two together. In this embodiment, the communicating vessel housing and the detection tube are installed together by means of flange bolts; the partition plate 52 is fitted and installed in the communicating vessel housing and horizontally divides the internal space of the communicating vessel housing into a side chamber 511 and a piston chamber 512. A drain hole penetrating the housing is provided at the bottom of the piston chamber, and a one-way drain valve 55 is fitted in the drain hole; strip-shaped communication holes 521 and floating holes 522 communicating with the side chamber are vertically spaced on the partition plate, and a communication hole 513 penetrating the housing is provided on the chamber wall of the piston chamber facing the partition plate; the combined piston is fitted and installed in the piston chamber, and the combined piston will float along the inner wall of the piston chamber under the action of the buoyancy of the water body to control the opening and closing of the communication hole and the on-off of the strip-shaped communication hole and the piston chamber above the combined piston. Specifically: As[[ID=A]] Figure 6As shown in the figure, the combined piston includes a wing plate 53 and a floating piston 54. A plate retaining platform 56 is arranged in a matching manner on the partition between the strip-shaped communication hole and the upper floating hole in the piston cavity. The wing plate is slidably installed vertically on the partition above the plate retaining platform to block and seal the strip-shaped communication hole. The left and right ends of the wing plate are attached to the inner wall of the adjacent side piston cavity. The plate retaining platform is used to restrict the sliding range of the wing plate. Moreover, a side hole 531 that always overlaps and communicates with the strip-shaped communication hole is provided on the partition. When the wing plate slides up and down along the partition to the extreme position, the wing plate always blocks and seals the strip-shaped communication hole on the partition, and only the side hole overlaps and communicates with the strip-shaped communication hole.

[0032] The floating piston 54 is made of a material that can float under the action of water buoyancy. The floating piston is installed in the piston cavity on the side of the wing plate away from the partition and is in contact with the wing plate, combining to form a complete piston body. The floating piston can drive the wing plate that has not slid to the extreme position to slide synchronously. In the initial state of the communicating vessel, the piston cavity below the combined piston is filled with water. Under the action of the water, the piston floating body will drive the wing plate to slide upward to the extreme position, and in this state, the floating piston blocks the inner hole of the communication hole to seal it. A connecting channel is arranged inside the floating body. The liquid inlet of the connecting channel is located on the upper end surface of the floating piston, and the liquid outlet of the connecting channel 541 is located at one end of the floating piston facing the wing plate and is arranged in a matching manner with the side hole. In the initial state, the liquid outlet of the connecting channel on the floating piston is located above the side hole of the wing plate, and the two do not overlap and communicate. Therefore, when the floating piston drives the wing plate to slide downward to open the communication hole under the impact of the water discharge in the detection box, the combined piston will squeeze the water in the lower piston cavity downward to drive the one-way drainage valve to drain water outwards.

[0033] As Figure 2 As shown in the figure, the flushing control mechanism 3 includes a drain pipe 31 vertically installed at the bottom of the detection box. A drain valve 32 connected to the controller is installed at the top of the drain pipe 31 in a matching manner. The bottom end of the drain pipe extends downward into the observation well and communicates with the core barrel 62. A breathing valve 33 is installed at the bottom end of the drain pipe in a matching manner. When the controller controls the drain valve to open, the detection box is communicated with the detection pipe through the drain pipe and the core barrel. Therefore, the water stored in the detection box will be pressurized and discharged into the communicating vessel through the detection pipe under the action of gravity.

[0034] As Figure 7As shown in the figure, when measuring the groundwater level, the controller will first control the water replenishing mechanism to pump groundwater into the detection tank to submerge the drain valve. When the water level in the detection tank reaches the preset opening height of the communication hole, the controller controls the water replenishing mechanism to close and opens the drain valve. The water stored in the detection tank is pressurized and discharged into the connector through the detection tube under the action of gravity. During this process, the water will wash the detection tube and the reflection float in the detection tube. Since the piston chambers on both sides of the composite piston are separated in the initial state, the water discharged into the connector will drive the float piston in the connector to drive the wing plate to slide downward to the limit position under the action of pressure, opening the communication hole. During this process, the water used to support the height of the composite piston in the lower piston chamber of the composite piston will be discharged from the connector through the one-way drain valve and pressure during the downward movement of the composite piston; as the communication hole is gradually opened, the driving pressure for the composite piston to move downward will gradually decrease. When the communication hole is fully opened, the water discharge pressure is affected by the remaining amount of water in the detection tank and will not drive the float piston to move downward continuously. After the water in the detection tank is drained, the controller will control the drain valve to reset and close. Since the water level in the detection tube is higher than the groundwater level when the drain valve resets and closes, the breathing valve opens to equalize the pressure, making the water level in the detection tube the same as the groundwater level. Thus, the controller can obtain the actual height of the groundwater level by controlling the laser water level detector to detect the height of the reflection float in the detection tube. By using the reflection float to reflect the laser pulse, it can effectively avoid the problem that the laser pulse reflected by floating objects in the well or groundwater is misinterpreted as the water surface, affecting the accuracy of the laser water level gauge detection result.

[0035] After the groundwater level height detection is completed, the controller will control the water replenishing mechanism to pump groundwater into the detection tank to submerge the drain valve. When the water level in the detection tank reaches the preset reset initial height, the controller controls the water replenishing mechanism to close and opens the drain valve. The water stored in the detection tank is pressurized and discharged into the connector through the detection tube under the action of gravity, driving the float piston to move downward, so that the liquid discharge port of the connection channel is connected to the side hole. Thus, a part of the water continuously discharged from the detection tank into the connector will be discharged into the lower chamber of the combined piston through the side chamber. As the liquid in the lower chamber gradually increases, the float piston will drive the wing plate to float upward to the limit position, blocking and closing the communication hole. And after the wing plate slides upward to the limit position, since there is still water in the detection tube, the float piston will continue to float upward alone. Thus, the liquid discharge port of the connection channel is separated from the side hole, separating the upper and lower chambers of the piston chamber, resetting the connector to the initial state, facilitating the next groundwater level detection operation. After the connector is reset to the initial state, the controller controls the drain valve to close.

[0036] The groundwater level measuring device provided in this embodiment utilizes a laser reflective coating on a reflective float to ensure that only signals from the reflective float are received, thereby preventing floating objects in the well or groundwater from affecting the measurement results. Furthermore, the detection tube and reflective float can be automatically cleaned before and after each measurement to prevent impurity accumulation from affecting measurement accuracy. This also extends the service life of the equipment and reduces long-term operating costs. In particular, the design of the float connector and combined piston ensures the correct flow direction of water during the measurement process and resets it to its initial state after the measurement is completed, facilitating the next measurement. The device uses groundwater itself as a cleaning medium, which not only saves resources but is also environmentally friendly and energy-efficient. The controller not only coordinates the work of the various components but is also responsible for recording and processing measurement data, providing convenient data recording and analysis functions and providing a scientific basis and support for water resource management and environmental protection. Example

[0037] 实施例2与实施例1的区别在于,如 Figure 1 As shown, a mesh cage 45 is mounted on one end of the pumping pipe immersed in the groundwater. The mesh cage can effectively prevent sand, gravel and other larger particles from entering the pumping pipe, preventing these substances from clogging the pipe or damaging the pump equipment, thereby helping to extend the service life of the equipment and reduce maintenance costs. In this embodiment, the mesh cage is made of corrosion-resistant materials, such as stainless steel, plastic or special coated metal, which can ensure that the mesh cage will not rust or be damaged when in long-term contact with groundwater. Example

[0038] The difference between Example 3 and Example 2 is that a breathing hole connected to the interior of the test box is matched with the top of the test box to ensure that the pressure inside the test box can be balanced with the external atmospheric pressure; furthermore, a mesh cover is fixedly installed on the bottom of the test box on one side of the sealing cover, and the drain pipe is located inside the mesh cover, which can prevent debris from entering the drain pipe. Example

[0039] The difference between Example 4 and Example 3 is that a sewage outlet connected to the observation well is provided at the bottom of the detection box on one side of the sealing cover, and a sewage valve connected to the controller is matched and installed on the sewage outlet. After the sewage valve is opened, groundwater is extracted through the water replenishment mechanism to flush the bottom of the detection box, and sediment or impurities are directly discharged into the observation well. Example

[0040] 实施例5与实施例4的区别在于,如 Figure 5 As shown, a piston limit block 57 is matched on the wall of the piston cavity below the connecting hole 513. When the floating piston drives the wing plate to slide downward to the limit position and the floating piston continues to move downward and collides with the piston limit block, the drain port of the connecting channel on the floating piston overlaps and is connected with the side hole on the wing plate.

[0041] It should be understood that the above specific embodiments of the present invention are only used for illustrative explanation or interpretation of the principles of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A groundwater level measuring device, comprising a controller and a detection box installed on an observation well, characterized in that, A water replenishing mechanism, a laser detection mechanism, and a flushing control mechanism are provided inside the detection box. The water replenishing mechanism is connected to the controller, and the pumping end of the water replenishing mechanism extends and is immersed in the groundwater. The laser detection mechanism includes a sealing cover, a core barrel, a laser water level detector, and a reflection float. The sealing cover is fixedly installed on the bottom of the detection box above the observation well. The core barrel is fixedly installed on the bottom of the box inside the sealing cover. The core barrel extends downward into the observation well and is provided with a detection tube. The bottom end of the detection tube extends downward and is immersed in the groundwater, and a float connector is installed. The reflection float is fitted and installed inside the detection tube. The laser water level detector is fitted and installed at the top end of the core barrel and is connected to the controller for detecting the height of the reflection float. The flushing control mechanism includes a drain pipe vertically installed on the bottom of the box. A drain valve connected to the controller is fitted and installed at the top of the drain pipe. The bottom end of the drain pipe extends downward into the observation well and is communicated with the core barrel. A breathing valve is fitted and installed at the bottom end of the drain pipe.

2. The groundwater level measuring device according to claim 1, characterized in that The detection box includes a cover plate and a box body. The cover plate is fitted and installed at the wellhead of the observation well. The box body is fitted and installed on the cover plate and forms a water tank for storing water together with the cover plate. The water replenishing mechanism, the laser detection mechanism, and the flushing control mechanism are all fitted and installed on the cover plate inside the box body.

3. The groundwater level measuring device according to claim 1, characterized in that, The water replenishing mechanism includes a water pump box fixedly installed inside the detection box. A water pump connected to the controller is fitted and installed inside the water pump box. The pumping end of the water pump is fitted and connected with a suction pipe. The other end of the suction pipe passes through the bottom of the water pump box and the detection box, extends through the observation well and is immersed in the groundwater. The drainage end of the water pump is fitted and connected with a water supply pipe. The other end of the water supply pipe extends upward through the water pump box to the inside of the detection box. And a water level sensor connected to the controller is fitted and installed inside the detection box.

4. The groundwater level measuring device according to claim 3, characterized in that, A cage is fitted and installed at one end of the suction pipe immersed in the groundwater.

5. The groundwater level measuring device according to claim 1, wherein Limit frames are fitted and installed inside both the bottom end and the top end of the detection tube.

6. The groundwater level measuring device according to claim 1, characterized in that, The float connector includes a connector housing, a partition plate, and a combined piston. The connector housing is installed at the bottom of the detection tube. The partition plate is fitted and installed inside the connector housing and horizontally divides the internal space of the connector housing into a side cavity and a piston cavity. A drain hole penetrating the housing is provided at the bottom of the piston cavity, and a one-way drain valve is fitted and installed inside the drain hole. Strip-shaped communication holes and upward floating holes communicated with the side cavity are vertically spaced on the partition plate. And a communication hole penetrating the housing is provided on the cavity wall of the piston cavity facing the partition plate. The combined piston is fitted and installed inside the piston cavity.

7. The groundwater level measuring device according to claim 6, characterized in that, The combined piston includes a wing plate and a float piston. A plate blocking platform is fitted and provided on the partition plate between the strip-shaped communication hole and the upward floating hole inside the piston cavity. The wing plate is vertically slidably installed on the partition plate above the plate blocking platform to block and seal the strip-shaped communication hole. And a side hole that always overlaps and communicates with the strip-shaped communication hole is provided on the partition plate. The float piston is fitted and installed inside the piston cavity on the side of the wing plate away from the partition plate and contacts the wing plate, combining to form a complete piston body. The float piston can drive the wing plate that has not slid to the limit position to slide synchronously. A connecting channel is fitted and provided inside the float. The liquid inlet of the connecting channel is located on the upper end surface of the float piston. The liquid outlet of the connecting channel is located at one end of the float piston facing the wing plate and is arranged to match the side hole.

8. The groundwater level measuring device according to claim 1, characterized in that, The laser water level gauge includes a water level gauge housing and a laser water level gauge body. The water level gauge housing is fitted and installed at the top of the core barrel and is connected to the internal channel of the core barrel. The laser water level gauge body is fixedly installed in the water level gauge housing and is connected to the controller. The reflective floating body includes a floating body block placed in the detection tube, and a laser reflective coating is provided outside the floating body block.

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