Underground water over-mining early warning device

Abstract

The invention discloses an underground water over-mining early warning device, which relates to the technical field of underground water level monitoring, and comprises a monitoring well, one end of a positioning rod is connected with the lower surface of the well lid, the other end of the positioning rod extends below the water surface of underground water, and a floater mechanism is rotatably arranged on the positioning rod. The floater mechanism can move up and down along the positioning rod and float on the water surface of underground water, the floater mechanism is provided with a plurality of light reflectors in the circumferential direction with the positioning rod as the circle center, the photoelectric sensor is arranged on the lower surface of the well lid, and the photoelectric sensor can monitor the distance between the light reflectors and the photoelectric sensor. The floater mechanism is positioned through the positioning rod, the floater mechanism is forced to only rotate and move up and down along the positioning rod, the light reflector is arranged on the floater mechanism, the influence of underground water flow impact on the floater mechanism can be reduced, the stability of the floater mechanism is improved, and the precision of the sensor and the accuracy of underground water level monitoring data are improved.

Description

Technical Field

[0001] The invention relates to the technical field of groundwater level monitoring, and in particular to a groundwater overexploitation early warning device. Background Art

[0002] Groundwater overexploitation is a serious environmental problem that not only affects the sustainable use of water resources, but may also cause a series of ecological and environmental problems. The main reasons for groundwater overexploitation include the large demand for water resources due to social and economic development and the combined impact of natural factors. Overexploitation leads to a drop in groundwater levels, depletion of aquifers, and depletion of water sources, which in turn leads to land subsidence, shrinkage of rivers and lakes, seawater intrusion, and ecological degradation. Early warning of groundwater overexploitation is an important management measure.

[0003] The existing groundwater overexploitation monitoring and early warning system has the following shortcomings:

[0004] 1. Low monitoring accuracy: Monitoring sensors are mostly mounted on float mechanisms. The floats are easily unstable due to the impact of groundwater flow, and mud and sand are easily accumulated on the surface after long-term use, resulting in reduced sensor accuracy and inaccurate water level monitoring data.

[0005] 2. The early warning mechanism is backward: Early warning generally adopts a quantitative early warning model, and the early warning effect is not ideal.

[0006] 3. Low degree of automation: mainly relying on manual collection and analysis of data, which results in heavy workload and slow response speed.

[0007] In view of this, how to provide a groundwater overexploitation warning device that can partially or completely solve the above-mentioned technical problems is an issue that technical personnel in this field urgently need to solve. Summary of the invention

[0008] The purpose of the present invention is to provide a groundwater overexploitation early warning device to solve the problems existing in the prior art.

[0009] To achieve the above object, the present invention provides the following solution: The present invention provides a groundwater overexploitation early warning device, comprising:

[0010] A monitoring well, which is arranged in the longitudinal direction, has a bottom connected to the aquifer, and a top close to the ground and provided with a well cover;

[0011] A positioning rod, one end of which is fixedly connected to the lower surface of the manhole cover, and the other end of which extends toward the aquifer and extends below the surface of the groundwater;

[0012] A float mechanism, which is rotatably disposed on the positioning rod, and can move up and down along the positioning rod and float on the surface of the groundwater. The float mechanism is centered on the positioning rod and has a plurality of light reflectors disposed along the circumference;

[0013] A photoelectric sensor is disposed on the lower surface of the manhole cover and / or the positioning rod. The photoelectric sensor corresponds to one or more light reflectors, and the photoelectric sensor can monitor the distance between the light reflector and the photoelectric sensor.

[0014] Furthermore, the float mechanism comprises:

[0015] A connecting part, wherein the connecting part is a hollow cylinder, the through hole of the connecting part is adapted to the outer diameter of the positioning rod, and the connecting part is rotatably arranged on the positioning rod and can move up and down along the positioning rod;

[0016] A rotating part, wherein the rotating part is streamlined, one end of which is fixedly connected to the connecting part, and the other end of which is contracted inwardly to form a pointed end, and the rotating part and the connecting part form a teardrop-shaped outer side surface;

[0017] A rotating plate is arranged along the length direction of the rotating part and fixedly connected to the tip. When groundwater flows through the rotating plate, the rotating plate is rotated to the same direction as the water flow direction by the impact force of the groundwater flow.

[0018] Furthermore, an internal power source is provided in the connecting portion and / or the rotating portion, and the internal power source supplies power to the light reflector.

[0019] Furthermore, it also includes a self-cleaning mechanism, and the self-cleaning mechanism includes:

[0020] A spray device, the spray device is fixedly arranged on the inner wall of the monitoring well, and its spray end faces the float mechanism;

[0021] A water inlet pipe, one end of which is connected to the water inlet end of the spray device, and the other end of which extends downward and extends below the surface of the groundwater. A water inlet pump is provided on the water inlet pipe.

[0022] Furthermore, it also includes:

[0023] A locking mechanism, the locking mechanism being arranged on the lower surface of the connecting portion, and the locking mechanism being capable of fixedly connecting the connecting portion and the positioning rod;

[0024] A rotating motor is fixedly arranged on the lower surface of the manhole cover, and the rotating motor is fixedly connected to the positioning rod through a coupling; the coupling extends outward to form a mounting portion, and the photoelectric sensor is arranged on the mounting portion.

[0025] Furthermore, the locking mechanism comprises:

[0026] The first locking ring and the second locking ring, the first locking ring and the second locking ring are symmetrically arranged relative to the positioning rod, and the first locking ring and the second locking ring are connected by a spring, and the spring has an elastic tendency to push the first locking ring and the second locking ring away from each other; a sliding groove is provided on the lower surface of the connecting part, and the first locking ring and the second locking ring are both clamped into the sliding groove by a clamping piece and can move horizontally along the sliding groove, the first locking ring is provided with a first electromagnet and the second locking ring is provided with a second electromagnet, and the first electromagnet corresponds to the second electromagnet; the first electromagnet and the second electromagnet are powered by the internal power supply, and when the first electromagnet and the second electromagnet are energized, a magnetic force is generated between the first locking ring and the second locking ring, and the first locking ring and the second locking ring overcome the elastic force of the spring, move along the sliding groove and approach each other, so that the first locking ring and the second locking ring are clamped on the positioning rod.

[0027] Furthermore, it also includes a photovoltaic mechanism, which is arranged on the ground and supplies power to the rotating motor, the photoelectric sensor and the water inlet pump.

[0028] Furthermore, it also includes a data processing module, the photoelectric sensor converts the distance between the light reflector and the photoelectric sensor into an electrical signal and sends it to the data processing module through LoRa and / or NB-IoT, the data processing module calculates the groundwater level according to the distance between the light reflector and the lower surface of the float mechanism, the water immersion depth of the float mechanism, and the distance between the light reflector and the photoelectric sensor, the data processing module sets the groundwater level warning threshold according to the land irrigation area, irrigation frequency, rainfall and land type in the area where the groundwater is located, and sends an alarm signal when the groundwater level is lower than the groundwater level warning threshold.

[0029] Furthermore, the groundwater level warning threshold is set for different time periods according to the land irrigation area, irrigation frequency and rainfall in the area where the groundwater is located in the previous year. When the photoelectric sensor sends an electrical signal to the data processing module, the data processing module compares the groundwater level with the groundwater level warning threshold for the corresponding time period according to the time period corresponding to the time when the photoelectric sensor sends the electrical signal.

[0030] The present invention discloses the following technical effects:

[0031] 1. The float mechanism is positioned by the positioning rod, forcing the float mechanism to only rotate and move up and down along the positioning rod. The light reflector is set on the float mechanism, which can reduce the impact of groundwater flow on the float mechanism, maximize the stability of the float mechanism, and improve the accuracy of the sensor and the accuracy of groundwater level monitoring data.

[0032] 2. The float mechanism has a connecting part, a rotating part and a rotating plate, which can automatically rotate to a posture in the same direction as the water flow by relying on the action of groundwater flow. After adjusting the posture, the impact force of the groundwater flow on the float mechanism is greatly reduced, and the posture of the float mechanism remains basically unchanged, which can greatly improve the stability of the float mechanism and further improve the accuracy of the sensor and the monitoring data.

[0033] 3. A plurality of light reflectors are arranged circumferentially on the upper edge of the float mechanism. When the float mechanism rotates to adjust its posture, at least one light reflector can correspond to the photoelectric sensor above, thereby ensuring the working stability of the sensor and avoiding the problem that the photoelectric sensor cannot emit light to the light reflector.

[0034] 4. The monitoring well is equipped with a self-cleaning mechanism that can pump groundwater and spray the float mechanism to clean it, thus avoiding the accumulation of mud and sand on the surface after long-term use.

[0035] 5. In order to improve the self-cleaning effect of the float mechanism, the float mechanism is provided with a locking mechanism, which can lock the float mechanism on the positioning rod, and the positioning rod can be driven to rotate by the rotating motor, so that during the spraying process of the self-cleaning mechanism, the float mechanism can be driven to rotate by the rotating motor to clean various positions of the float mechanism, thereby improving the cleaning effect.

[0036] 6. The threshold setting is based on the irrigation area, irrigation frequency, rainfall and land type of the groundwater area. The threshold setting is regional and more in line with the actual needs of over-exploitation warning. In addition, the data processing module adopts dynamic warning thresholds, and sets different warning thresholds according to different time periods. The authenticity of groundwater level warning is improved and the warning effect is more ideal. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0039] Figure 1A for Figure 1 Schematic diagram of the structure of the rotating motor;

[0040] Figure 1B for Figure 1 Structural diagram of the middle spray device;

[0041] Figure 2 It is a cross-sectional view of the float mechanism structure;

[0042] Figure 3 It is a top view of the float mechanism;

[0043] Figure 4 It is a schematic diagram of the locking mechanism structure;

[0044] Figure 5 A schematic diagram of the first locking ring and the second locking ring clamping the positioning rod;

[0045] Figure 6 is a schematic diagram of cooperation between the first locking ring and the connecting portion;

[0046] Among them, 1. monitoring well; 2. aquifer; 3. positioning rod; 4. float mechanism; 401. connecting part; 4011. slide groove; 402. rotating part; 403. rotating plate; 5. photoelectric sensor; 6. light reflector; 7. internal power supply; 8. spray device; 9. water inlet pipe; 10. water inlet pump; 11. locking mechanism; 1101. first locking ring; 1102. second locking ring; 1103. spring; 1104. first electromagnet; 1105. second electromagnet; 12. rotating motor; 13. coupling; 14. photovoltaic mechanism. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] like Figure 1-Figure 6As shown, the embodiment of the present invention provides a groundwater overexploitation early warning device, comprising: a monitoring well 1, the monitoring well 1 is arranged in the longitudinal direction, the bottom of the monitoring well 1 is connected to the aquifer 2, the top of the monitoring well 1 is close to the ground and is provided with a well cover; a positioning rod 3, one end of the positioning rod 3 is fixedly connected to the lower surface of the well cover, and the other end extends to the aquifer 2 and extends below the surface of the groundwater; a float mechanism 4, the float mechanism 4 is rotatably arranged on the positioning rod 3, and can move up and down along the positioning rod 3 and float on the surface of the groundwater, the float mechanism 4 takes the positioning rod 3 as the center of the circle, and is provided with a plurality of light reflectors 6 along the circumferential direction; the inner diameter of the monitoring well 1 is greater than the rotation radius of the float mechanism 4. A photoelectric sensor 5, the photoelectric sensor 5 is arranged on the positioning rod 3 on the lower surface of the well cover, the photoelectric sensor 5 corresponds to at least one light reflector 6, the photoelectric sensor 5 emits a beam of infrared light to the light reflector 6, after the emitted light reaches the light reflector 6, the light reflector 6 reflects the light to the photoelectric sensor 5, after the photoelectric sensor 5 receives the reflected light, the photoelectric sensor 5 can calculate the distance between the light reflector 6 and the photoelectric sensor 5.

[0050] like Figure 2 As shown, the float mechanism 4 includes: a connecting part 401, which is a hollow cylinder, and the through hole of the connecting part 401 is adapted to the outer diameter of the positioning rod 3 (slightly larger than the outer diameter of the positioning rod 3 to avoid excessive friction during the up and down movement of the connecting part 401), and the connecting part 401 can be rotatably arranged on the positioning rod 3 and can move up and down along the positioning rod 3; the light reflector 6 is arranged on the upper surface of the connecting part 401, and the gap between each light reflector 6 is small, and the overall arrangement is circular. No matter which direction the connecting part 401 rotates to, there is at least one light reflector 6 that can receive the infrared light emitted by the photoelectric sensor 5. The rotating part 402, such as Figure 3 As shown, the rotating part 402 is streamlined, one end of which is fixedly connected to the connecting part 401, and the other end is contracted inward to form a tip, and the rotating part 402 and the connecting part 401 form a teardrop-shaped outer side surface; the rotating plate 403 is arranged along the length direction of the rotating part 402 and fixedly connected to the tip. When groundwater flows through the rotating plate 403, the rotating plate 403 is rotated to the same direction as the water flow direction by the impact force of the groundwater flow. For example, when the groundwater flow direction is from left to right, the float mechanism 4 is Figure 3 The posture shown.

[0051] like Figure 2 As shown, an internal power source 7 is disposed in the connecting portion 401 and / or the rotating portion 402 , and the internal power source 7 supplies power to the light reflector 6 .

[0052] like Figure 1 and Figure 1BAs shown, it also includes a self-cleaning mechanism, which includes: a spray device 8, which is fixedly arranged on the inner wall of the monitoring well 1, and its spray end faces the float mechanism 4; an inlet pipe 9, one end of the inlet pipe 9 is connected to the water inlet end of the spray device 8, and the other end extends downward and extends below the water surface of the groundwater, and a water inlet pump 10 is arranged on the inlet pipe 9.

[0053] like Figure 1A and Figure 2 As shown, it also includes: a locking mechanism 11, which is arranged on the lower surface of the connecting part 401, and the locking mechanism 11 can fix the connecting part 401 and the positioning rod 3; a rotating motor 12, which is fixedly arranged on the lower surface of the manhole cover, and the rotating motor 12 is fixedly connected to the positioning rod 3 through a coupling 13; the coupling 13 extends outward to form a mounting part, and the photoelectric sensor 5 is arranged on the mounting part.

[0054] like Figure 4 As shown, the locking mechanism 11 includes: a first locking ring 1101 and a second locking ring 1102, the first locking ring 1101 and the second locking ring 1102 are symmetrically arranged relative to the positioning rod 3, the first locking ring 1101 and the second locking ring 1102 are connected by a spring 1103, and the spring 1103 has an elastic tendency to move the first locking ring 1101 and the second locking ring 1102 away from each other; Figure 6 As shown, a slide groove 4011 is provided on the lower surface of the connecting portion 401, and the first locking ring 1101 and the second locking ring 1102 are both inserted into the slide groove 4011 through a clamping member and can move horizontally along the slide groove 4011, the first locking ring 1101 is provided with a first electromagnet 1104 and the second locking ring 1102 is provided with a second electromagnet 1105, and the first electromagnet 1104 corresponds to the second electromagnet 1105; the first electromagnet 1104 and the second electromagnet 1105 are powered by an internal power supply 7, as shown in FIG. Figure 5 As shown, when the first electromagnet 1104 and the second electromagnet 1105 are powered on, magnetic force is generated between the first locking ring 1101 and the second locking ring 1102, and the first locking ring 1101 and the second locking ring 1102 overcome the elastic force of the spring 1103, move along the slide groove 4011 and approach each other, so that the first locking ring 1101 and the second locking ring 1102 are clamped on the positioning rod 3. It should be noted that when the first electromagnet 1104 and the second electromagnet 1105 are not powered on, there is a gap between the first electromagnet 1104 and the second electromagnet 1105 and the positioning rod 3, and there is also a gap between the positioning rod 3 and the slide groove 4011, and the first electromagnet 1104 and the second electromagnet 1105 do not affect the rotation function of the connecting part 401 under normal conditions. After the first locking ring 1101 and the second locking ring 1102 are clamped on the positioning rod 3 , the rotating motor 12 can drive the float mechanism 4 to rotate, and the spray device 8 can cooperate to spray and clean the float mechanism 4 comprehensively.

[0055] like Figure 1 As shown, it also includes a photovoltaic mechanism 14 , which is arranged on the ground and supplies power to the rotating motor 12 , the photoelectric sensor 5 and the water inlet pump 10 .

[0056] In this embodiment, a data processing module is also included. The photoelectric sensor 5 converts the distance between the light reflector 6 and the photoelectric sensor 5 into an electrical signal and sends it to the data processing module through LoRa and / or NB-IoT. The data processing module calculates the groundwater level (the distance between the light reflector 6 and the lower surface of the float mechanism 4 + the distance between the light reflector 6 and the photoelectric sensor 5 - the depth of the float mechanism 4) according to the distance between the light reflector 6 and the lower surface of the float mechanism 4, the water entry depth of the float mechanism 4 (the water entry depth is a fixed value), and the distance between the light reflector 6 and the photoelectric sensor 5. The data processing module sets the groundwater level warning threshold according to the land irrigation area, irrigation frequency, rainfall and land type in the area where the groundwater is located. For example, when the land irrigation area is large and the irrigation frequency is high, the threshold can be appropriately lowered (representing the lowering of the minimum safe water level of groundwater). When the rainfall is large, the threshold can also be lowered. In the above case, the groundwater level can be replenished and restored in a short time. When the land type is easy to settle or loose land, the threshold should be increased to reduce the risk. When the groundwater level is lower than the groundwater level warning threshold, an alarm signal is issued. The groundwater level warning threshold is set for different time periods according to the land irrigation area, irrigation frequency and rainfall in the area where the groundwater is located in the previous year. When the photoelectric sensor 5 sends an electrical signal to the data processing module, the data processing module compares the groundwater level with the groundwater level warning threshold for the corresponding time period according to the time period corresponding to the time when the photoelectric sensor 5 sends the electrical signal.

[0057] The data processing module generates early warning information based on the analysis results and threshold judgment. It stores, manages and analyzes massive groundwater data to establish a groundwater dynamic change model. Based on deep learning technology, the model is trained to identify the early characteristics and trends of groundwater overexploitation. For example, by analyzing the water level drop rate and water quality change patterns in historical data, the time and degree of overexploitation in the future can be predicted. The system can continuously optimize and adjust the early warning model based on newly collected data to improve the accuracy and reliability of the early warning. For example, when it is found that the model prediction results deviate from the actual situation, the model parameters are automatically adjusted to adapt to the groundwater change patterns in different regions and seasons. The early warning information of groundwater overexploitation is displayed in an intuitive map form through the Geographic Information System (GIS), providing decision makers with a clear visual reference and facilitating the formulation of targeted control measures. When the system monitors that the groundwater data reaches or approaches the preset groundwater level warning threshold, it sends early warning information to relevant departments and personnel through multiple channels such as SMS, email, and mobile applications, and provides detailed overexploitation analysis reports and response suggestions.

[0058] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A groundwater overexploitation early warning device, It is characterized in that include: A monitoring well (1), the monitoring well (1) being arranged in the longitudinal direction, the bottom of which is connected to the aquifer (2), the top of which is close to the ground and provided with a well cover; A positioning rod (3), one end of which is fixedly connected to the lower surface of the manhole cover, and the other end of which extends toward the aquifer (2) and extends below the surface of the groundwater; A float mechanism (4), the float mechanism (4) being rotatably arranged on the positioning rod (3), capable of moving up and down along the positioning rod (3) and floating on the surface of groundwater, the float mechanism (4) being arranged with a plurality of light reflectors (6) along the circumference with the positioning rod (3) as the center of the circle; A photoelectric sensor (5), wherein the photoelectric sensor (5) is arranged on the lower surface of the manhole cover and / or the positioning rod (3), the photoelectric sensor (5) corresponds to one or more light reflectors (6), and the photoelectric sensor (5) is capable of monitoring the distance between the light reflector (6) and the photoelectric sensor (5).

2. A groundwater overexploitation early warning device according to claim 1, It is characterized in that The float mechanism (4) comprises: A connecting portion (401), wherein the connecting portion (401) is a hollow cylinder, the through hole of the connecting portion (401) is adapted to the outer diameter of the positioning rod (3), and the connecting portion (401) is rotatably arranged on the positioning rod (3) and is capable of moving up and down along the positioning rod (3); A rotating part (402), wherein the rotating part (402) is streamlined, one end of which is fixedly connected to the connecting part (401), and the other end of which is contracted inwardly to form a pointed end, and the rotating part (402) and the connecting part (401) form a teardrop-shaped outer side surface; A rotating plate (403) is arranged along the length direction of the rotating part (402) and is fixedly connected to the tip. When groundwater flows through the rotating plate (403), the rotating plate (403) is rotated to the same direction as the water flow direction by the impact force of the groundwater flow.

3. A groundwater overexploitation early warning device according to claim 2, It is characterized in that An internal power source (7) is provided in the connecting portion (401) and / or the rotating portion (402), and the internal power source (7) supplies power to the light reflector (6).

4. A groundwater overexploitation early warning device according to claim 3, It is characterized in that Also included is a self-cleaning mechanism, the self-cleaning mechanism comprising: A spray device (8), the spray device (8) being fixedly arranged on the inner wall of the monitoring well (1), with its spray end facing the float mechanism (4); A water inlet pipe (9), one end of which is connected to the water inlet end of the spray device (8), and the other end of which extends downward and extends below the surface of the groundwater. A water inlet pump (10) is provided on the water inlet pipe (9).

5. A groundwater overexploitation early warning device according to claim 4, It is characterized in that Also includes: A locking mechanism (11), the locking mechanism (11) being arranged on the lower surface of the connecting portion (401), and the locking mechanism (11) being capable of fixedly connecting the connecting portion (401) and the positioning rod (3); A rotating motor (12), the rotating motor (12) is fixedly arranged on the lower surface of the manhole cover, and the rotating motor (12) is fixedly connected to the positioning rod (3) via a coupling (13); the coupling (13) extends outward to form a mounting portion, and the photoelectric sensor (5) is arranged on the mounting portion.

6. A groundwater overexploitation early warning device according to claim 5, It is characterized in that The locking mechanism (11) comprises: A first locking ring (1101) and a second locking ring (1102), wherein the first locking ring (1101) and the second locking ring (1102) are symmetrically arranged relative to the positioning rod (3), and the first locking ring (1101) and the second locking ring (1102) are connected by a spring (1103), and the spring (1103) has an elastic tendency to move the first locking ring (1101) and the second locking ring (1102) away from each other; a sliding groove (4011) is provided on the lower surface of the connecting portion (401), and the first locking ring (1101) and the second locking ring (1102) are both clamped into the sliding groove (4011) by a clamping piece and can move horizontally along the sliding groove (4011), and the first locking ring (1101) is provided with a first electromagnet (1103). 4) The second locking ring (1102) is provided with a second electromagnet (1105), and the first electromagnet (1104) corresponds to the second electromagnet (1105); the first electromagnet (1104) and the second electromagnet (1105) are powered by the internal power supply (7), and when the first electromagnet (1104) and the second electromagnet (1105) are energized, a magnetic force is generated between the first locking ring (1101) and the second locking ring (1102), and the first locking ring (1101) and the second locking ring (1102) overcome the elastic force of the spring (1103), move along the slide groove (4011) and approach each other, so that the first locking ring (1101) and the second locking ring (1102) are clamped on the positioning rod (3).

7. A groundwater overexploitation early warning device according to claim 6, It is characterized in that It also comprises a photovoltaic mechanism (14), which is arranged on the ground and supplies power to the rotating motor (12), the photoelectric sensor (5) and the water inlet pump (10).

8. A groundwater overexploitation early warning device according to claim 1, It is characterized in that It also includes a data processing module, wherein the photoelectric sensor (5) converts the distance between the light reflector (6) and the photoelectric sensor (5) into an electrical signal and sends the signal to the data processing module via LoRa and / or NB-IoT, wherein the data processing module calculates the groundwater level based on the distance between the light reflector (6) and the lower surface of the float mechanism (4), the water entry depth of the float mechanism (4), and the distance between the light reflector (6) and the photoelectric sensor (5), wherein the data processing module sets a groundwater level warning threshold based on the land irrigation area, irrigation frequency, rainfall and land type in the area where the groundwater is located, and sends an alarm signal when the groundwater level is lower than the groundwater level warning threshold.

9. A groundwater overexploitation early warning device according to claim 8, It is characterized in that The groundwater level warning threshold is set for different time periods according to the land irrigation area, irrigation frequency and rainfall in the area where the groundwater is located in the previous year. When the photoelectric sensor (5) sends an electrical signal to the data processing module, the data processing module compares the groundwater level with the groundwater level warning threshold for the corresponding time period according to the time period corresponding to the time when the photoelectric sensor (5) sends the electrical signal.

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