Device for measuring water level difference between underground water and surface water in coal mining subsidence area

Abstract

The utility model belongs to the field of water level difference measurement, and particularly relates to a water level difference measuring device for underground water and surface water in a coal mining subsidence area. A protective cover is arranged at the bottom end of the probe rod, a water level sensor A for detecting the water level of underground water is installed in the protective cover, the bottom side of the protective cover is sleeved with a fixing ring, a supporting plate is arranged in the fixing ring, a micro motor is installed at the bottom of the supporting plate, and the output end of the micro motor penetrates through the supporting plate to be connected with a rotating rod; through the structural design that a micro motor in the protective cover drives a rotating rod to drive a U-shaped rod and a sawtooth-shaped scraping piece to rotate periodically, the function of automatically removing sediment deposited around the underground water A water level sensor is achieved, and the problem that the sensor is distorted due to sediment clogging of a traditional device is solved; and the sediment is stripped and discharged along with the water flow through the fitting movement of the sawtooth scraping blade of the scraping blade and the inner wall of the protective cover, so that the sensor keeps accurate monitoring for a long time, and the reliability of underground water level data is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the technical field of water level difference measurement devices, and in particular to a water level difference measurement device for groundwater and surface water in coal mining subsidence areas. Background Technology

[0002] The North China Plain is one of my country's main coal-producing areas. Due to the thick loose layer and high groundwater level in this region, a large number of coal mining subsidence and water accumulation areas have been formed, which has changed the original hydrological cycle pattern of the region. The cross-flow exchange between surface water and groundwater is one of the important cycle units. Due to the continuous subsidence of the surface, the changes in the water levels of surface water and groundwater have become more complex.

[0003] Patent CN215952690U discloses a dynamic groundwater and surface water level difference measuring device for coal mining subsidence areas, which has the following problems:

[0004] While it can improve the accuracy and efficiency of manual water level monitoring, during groundwater level monitoring, the deposition of sediment in the groundwater can cover the water level sensor, causing the pressure sensing of the water level sensor to become distorted and the monitoring to fail, thus affecting the efficiency of monitoring. In addition, the terrain of the mining subsidence area is complex, and during monitoring, it is impossible to adjust and adapt the fixed monitoring device according to the terrain, which affects the stability of monitoring.

[0005] To address this issue, this application presents a device for measuring the difference in groundwater and surface water levels in coal mining subsidence areas. Summary of the Invention

[0006] This invention addresses the shortcomings of existing technologies, such as the distortion of pressure sensing and monitoring failure caused by sediment deposition in groundwater covering the water level sensor, which affects monitoring efficiency. Furthermore, it addresses the instability of monitoring in complex mining subsidence areas where it is impossible to adjust and adapt the fixed monitoring device according to the terrain, thus affecting monitoring stability. Therefore, this invention provides a device for measuring the difference between groundwater and surface water levels in coal mining subsidence areas.

[0007] The device includes a probe rod; a protective cover is installed at the bottom of the probe rod, and an A-level water level sensor for detecting groundwater level is installed inside the protective cover. A fixing ring is fitted onto the bottom side of the protective cover, and a support plate is installed inside the fixing ring. A micro motor is installed at the bottom of the support plate, and the output end of the micro motor passes through the support plate and connects to a rotating rod. A U-shaped rod is installed on the surface of the rotating rod, and scrapers are embedded on both sides of the U-shaped rod. A connecting block is arranged in a ring array at the top of the probe rod, and the connecting block is movably connected to a telescopic rod. A threaded cap for adjusting tightness is installed on the side of the telescopic rod, and one end of the telescopic rod is connected to a fixing block. The bottom of the fixing block is connected to a fixing ball through a connecting rod. The fixing ball is fitted with a threaded cover, and a threaded plate that wraps around the fixing ball is connected in a ring array inside the threaded cover. A conical disk is installed at the bottom of the threaded plate, and threaded pins are symmetrically arranged at the four corners of the surface of the conical disk. A connecting plate is installed on one side of the top of the probe rod, and the connecting plate is connected to a float. A lifting rod is installed inside the float, and a floating platform is installed at the bottom of the lifting rod. A B-level water level sensor for detecting surface water level is installed at the bottom of the floating platform.

[0008] Preferably, the output shaft of the micro motor is rigidly connected to the rotating rod via a keyway, and the U-shaped rod is welded and fixed to the scraper, with serrated scraping edges on the surface of the scraper.

[0009] Preferably, the telescopic rod is composed of multiple nested square sleeves, and the internal thread of the threaded cap is opposite to the external thread of the telescopic rod, and the outer surface is provided with anti-slip knurling.

[0010] Preferably, the surface of the fixed ball has an annular groove, the inner wall of the threaded cover is provided with an elastic flange that engages with the groove, and the end of the threaded plate is bent to form a fixing claw that fits against the conical disc.

[0011] Preferably, the tapered disc has a threaded hole on its edge that matches the threaded pin, and an anti-loosening washer is provided at the end of the threaded pin.

[0012] Preferably, the bottom of the floating platform is provided with a counterweight block and the center of gravity is symmetrically distributed with the B water level sensor, and the boom and the float are rotatably connected by a waterproof bearing.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model achieves the automatic removal of sediment around the groundwater A-level sensor by using a micro motor inside the protective cover to drive the rotating rod, which in turn drives the U-shaped rod and the serrated scraper to rotate periodically. This solves the problem of sensor distortion caused by sediment blockage in traditional devices. The scraper blades adhere to the inner wall of the protective cover, peeling off the sediment and discharging it with the water flow, so that the sensor can maintain accurate monitoring for a long time and significantly improve the reliability of groundwater level data.

[0015] 2. This utility model, through the structural design of telescopic rods arranged in a ring array at the top of the probe and threaded caps for adjusting tightness, realizes the adaptive fixing function of the device to complex terrain in the subsidence area, solving the problem of unstable installation caused by terrain undulations in traditional devices. By adjusting the length of the telescopic rods and locking the threaded caps, combined with the multi-angle clamping mechanism of the fixing ball and the threaded plate, the conical disc is anchored to different inclined ground through threaded pins, ensuring the stability of the monitoring reference surface and reducing terrain interference errors. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the probe structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the U-shaped rod structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the fixed ball and threaded cap structure of this utility model.

[0020] In the picture,

[0021] 1. Probe rod; 2. Protective cover; 3. A-level water level sensor; 4. Fixing ring; 5. Support plate; 6. Miniature motor; 7. Rotating rod; 8. U-shaped rod; 9. Connecting block; 10. Telescopic rod; 11. Threaded cap; 12. Fixing block; 13. Connecting rod; 14. Fixing ball; 15. Threaded cap; 16. Threaded plate; 17. Conical disc; 18. Threaded pin; 19. Float; 20. Lifting rod; 21. Floating platform; 22. B-level water level sensor; 23. Scraper; 24. Connecting plate. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] Figures 1-4This is a specific embodiment of the present invention, which is a device for measuring the difference in groundwater and surface water levels in a coal mining subsidence area. It includes a probe rod 1; a protective cover 2 is installed at the bottom of the probe rod 1, and an A-level sensor 3 for detecting groundwater level is installed inside the protective cover 2. A fixing ring 4 is sleeved on the bottom side of the protective cover 2, and a support plate 5 is installed inside the fixing ring 4. A micro motor 6 is installed at the bottom of the support plate 5, and the output end of the micro motor 6 passes through the support plate 5 and connects to a rotating rod 7. A U-shaped rod 8 is provided on the surface of the rotating rod 7, and scrapers 23 are embedded on both sides of the U-shaped rod 8. A connecting block 9 is arranged in a circular array at the top of the probe rod 1, and the connecting block 9 is movably connected to a telescopic rod 10. The telescopic rod 10 has a connecting block 9 on its side. The probe 10 is equipped with a threaded cap 11 for adjusting tightness. One end of the telescopic rod 10 is connected to a fixing block 12. The bottom of the fixing block 12 is connected to a fixing ball 14 via a connecting rod 13. The fixing ball 14 is fitted with a threaded cover 15. The threaded cover 15 has a ring array of threads connecting to a threaded plate 16 that wraps around the fixing ball 14. The bottom of the threaded plate 16 is equipped with a conical disc 17. Threaded pins 18 are symmetrically arranged at the four corners of the surface of the conical disc 17. A connecting plate 24 is set on one side of the top of the probe 1. The connecting plate 24 is connected to a float 19. A lifting rod 20 is set inside the float 19. A floating platform 21 is set at the bottom of the lifting rod 20. A B-level sensor 22 for detecting the surface water level is installed at the bottom of the floating platform 21.

[0025] During operation, probe 1 is vertically inserted into the groundwater layer of the coal mining subsidence area. Protective cover 2 encloses A water level sensor 3 to prevent direct impact from silt. Micro motor 6 periodically starts to drive rotating rod 7 to rotate, driving U-shaped rod 8 and serrated scraper 23 to scrape away sediment from the inner wall of protective cover 2. The telescopic rod 10 at the top of probe 1 extends to different lengths by adjusting threaded cap 11. Fixed ball 14 adjusts the angle of conical disk 17 under the clamping of threaded plate 16. Threaded nail 18 is screwed into the ground for anchoring. Float 19 is suspended on the surface water by floating platform 21. B water level sensor 22 monitors the water level in real time, and the data is wirelessly transmitted to the terminal to calculate the water level difference. Micro motor 6 drives scraper 23 to automatically remove silt. A water level sensor 3 provides long-term accurate monitoring. Telescopic rod 10 and conical disk 17 work together to adapt to the terrain, improving installation stability.

[0026] Furthermore, the output shaft of the micro motor 6 is rigidly connected to the rotating rod 7 via a keyway, and the U-shaped rod 8 is welded and fixed to the scraper 23, with serrated scraping blades opened on the surface of the scraper 23;

[0027] During operation, the output shaft of the micro motor 6 is rigidly connected to the rotating rod 7 via a keyway to prevent torque transmission failure.

[0028] Furthermore, the telescopic rod 10 is composed of multiple nested square sleeves, and the internal thread of the threaded cap 11 is opposite to the external thread of the telescopic rod 10 and the outer surface is provided with anti-slip knurling.

[0029] During operation, the telescopic rod 10 is nested by three square sleeves. When the threaded cap 11 with reverse threads is tightened, it squeezes the gap between the sleeves to achieve locking. The anti-slip knurling increases the friction of hand-tightening and improves the accuracy of single adjustment.

[0030] Furthermore, an annular groove is formed on the surface of the fixed ball 14, and an elastic flange that engages with the groove is provided on the inner wall of the threaded cover 15. The end of the threaded piece 16 is bent to form a fixing claw that fits against the conical disk 17.

[0031] During operation, the annular groove of the fixed ball 14 engages with the elastic flange inside the threaded cover 15, allowing the ball to deflect ±25°; the fixing claw at the end of the threaded plate 16 bends and fits against the surface of the conical disc 17, and when the threaded cover 15 is tightened, the fixing claw is pressed to achieve angle locking.

[0032] Furthermore, the edge of the conical disc 17 is provided with a threaded hole that matches the threaded pin 18, and an anti-loosening washer is provided at the end of the threaded pin 18;

[0033] During operation, the screw hole on the edge of the conical disc 17 matches the threaded pin 18. After being screwed into the ground, the anti-loosening washer is squeezed and deformed to fill the thread gap, thus offsetting the backing caused by vibration.

[0034] Furthermore, a counterweight is provided at the bottom of the floating platform 21 and its center of gravity is symmetrically distributed with the B water level sensor 22. The boom 20 and the float 19 are rotatably connected by a waterproof bearing.

[0035] During operation, the counterweight at the bottom of the floating platform 21 is symmetrically distributed with the B water level sensor 22, and the center of gravity sinks vertically to keep the floating platform 21 horizontal; the waterproof bearing allows the boom 20 to rotate freely 360° with the waves, offsetting the effect of water surface fluctuations on the tilt angle of the B water level sensor 22.

[0036] Working principle: The probe rod 1 is inserted into the groundwater layer and driven by the micro motor 6, the rotating rod 7 drives the U-shaped rod 8 and the sawtooth scraper 23 to rotate and remove the sediment in the protective cover 2, ensuring that the A water level sensor 3 accurately monitors the groundwater. The telescopic rod 10 at the top of the probe rod 1 is adjusted in length by the threaded cap 11 and is clamped to the conical disk 17 by the fixed ball 14 and the threaded plate 16. It is anchored to the inclined ground in the subsidence area by the threaded nail 18 to achieve terrain-adaptive fixation. At the same time, the floating platform 21 connected to the hanging rod 20 in the float 19 is kept horizontally suspended by the bottom counterweight and waterproof bearing. The B water level sensor 22 dynamically tracks the surface water level. The data from the two sensors are wirelessly synchronized and the water level difference is calculated. Finally, the automatic dredging, terrain adaptation, dynamic balance and high-precision synchronous monitoring of the groundwater and surface water levels in the subsidence area are realized.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A device for measuring the difference in groundwater and surface water levels in a coal mining subsidence area, comprising a probe (1), characterized in that: The probe (1) is provided with a protective cover (2) at the bottom. The protective cover (2) is equipped with an A-level sensor (3) for detecting groundwater level. The protective cover (2) is fitted with a fixing ring (4) on the bottom side. The fixing ring (4) is provided with a support plate (5). The support plate (5) is equipped with a micro motor (6) at the bottom. The output end of the micro motor (6) passes through the support plate (5) and connects to the rotating rod (7). The rotating rod (7) is provided with a U-shaped rod (8) on the surface. The U-shaped rod (8) is embedded with scrapers (23) on both sides. The probe (1) has a connecting block (9) arranged in a ring array at the top end. The connecting block (9) is movably connected to the telescopic rod (10). The telescopic rod (10) has a threaded cap (11) for adjusting tightness on its side. One end of the telescopic rod (10) is connected to a fixing block (12). The bottom of the fixing block (12) is connected to a fixing ball (14) through a connecting rod (13). The fixing ball (14) is fitted with a threaded cover (15). The threaded cover (15) has a threaded plate (16) that wraps around the fixing ball (14) in a ring array inside. A conical disc (17) is provided at the bottom of the threaded plate (16). Threaded pins (18) are symmetrically arranged at the four corners of the surface of the conical disc (17). A connecting plate (24) is provided on one side of the top of the probe (1). The connecting plate (24) is connected to the float (19). A suspending rod (20) is provided inside the float (19). A floating platform (21) is provided at the bottom of the suspending rod (20). A B-level sensor (22) for detecting the surface water level is installed at the bottom of the floating platform (21).

2. The device for measuring the difference in groundwater and surface water levels in coal mining subsidence areas according to claim 1, characterized in that: The output shaft of the micro motor (6) is rigidly connected to the rotating rod (7) through a keyway. The U-shaped rod (8) is welded and fixed to the scraper (23), and the scraper (23) has a serrated scraping edge on its surface.

3. The device for measuring the difference in groundwater and surface water levels in coal mining subsidence areas according to claim 1, characterized in that: The telescopic rod (10) is composed of multiple nested square sleeves. The internal thread of the threaded cap (11) is opposite to the external thread of the telescopic rod (10), and the outer surface is provided with anti-slip knurling.

4. The device for measuring the difference in groundwater and surface water levels in coal mining subsidence areas according to claim 1, characterized in that: The surface of the fixed ball (14) has an annular groove, the inner wall of the threaded cover (15) is provided with an elastic flange that engages with the groove, and the end of the threaded piece (16) is bent to form a fixing claw that fits with the conical disk (17).

5. The device for measuring the difference in groundwater and surface water levels in coal mining subsidence areas according to claim 1, characterized in that: The conical disc (17) has a threaded hole on its edge that matches the threaded pin (18), and the threaded pin (18) has an anti-loosening washer at its end.

6. The device for measuring the difference in groundwater and surface water levels in coal mining subsidence areas according to claim 1, characterized in that: The bottom of the floating platform (21) is equipped with a counterweight block and the center of gravity is symmetrically distributed with the B water level sensor (22). The boom (20) and the float (19) are rotatably connected by a waterproof bearing.

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