A groundwater level observation device

Abstract

The application discloses a groundwater level observation device, which comprises a drilling assembly, a cleaning assembly is arranged at the upper end of the drilling assembly, a receiving assembly is arranged outside the cleaning assembly, a water level observation assembly is fixedly connected to the outside of the bottom end of the drilling assembly, the drilling assembly comprises a drilling cylinder, a fixing frame is fixedly sleeved at the bottom end of the drilling cylinder, three bolt shafts are threadedly and drivably sleeved outside the fixing frame, fixed screw blades are arranged at the bottom end shaft bodies of the bolt shafts, the water level observation assembly comprises a water level cylinder, a communication pipe is fixedly connected to the bottom end of the water level cylinder, the pipe body of the communication pipe is in communication with the drilling cylinder, a movable box is movably sleeved in the water level cylinder, an air pressure compartment is arranged in the movable box, a partition plate is fixedly installed in the movable box, a left electromagnet is fixedly connected to the left side surface of the partition plate, and a right electromagnet is fixedly connected to the right side surface of the partition plate. The groundwater level observation device has the soil cleaning function after drilling work, and has the intuitive observation structure of the groundwater level.

Description

Technical Field

[0001] This invention relates to the field of auxiliary technology for water conservancy engineering construction, and more specifically to a groundwater level monitoring device. Background Technology

[0002] In water conservancy projects, groundwater level detection is particularly important because the construction of various equipment in water conservancy projects needs to be based on the height of the groundwater level. Therefore, staff often use groundwater level observation devices to measure the water level. However, traditional groundwater level observation devices still have the following shortcomings.

[0003] Firstly, traditional groundwater level monitoring devices are generally used in conjunction with underground wells, that is, the detection device is placed in the underground well for detection. However, in most water conservancy detection activities, there are no existing underground detection wells in the detection area. This requires the staff to first carry out underground drilling work. However, traditional groundwater level monitoring devices do not have the function of underground detection drilling, and the underground soil brought up by the drill shaft during the drilling process is also difficult to clean.

[0004] Secondly, traditional groundwater level monitoring devices generally use water pressure sensors to measure water levels, but electronic sensors are easily affected by temperature, especially in the environment of underground soil and groundwater, where the specific temperature is usually unpredictable, and the cost of using electronic sensors is also high.

[0005] Therefore, in order to solve the above problems, it is necessary to provide a groundwater level monitoring device. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a groundwater level observation device to solve the problems existing in the background art.

[0007] The present invention provides the following technical solution: a groundwater level observation device, including a drilling assembly, a cleaning assembly at the upper end of the drilling assembly, a receiving assembly on the outer side of the cleaning assembly, and a water level observation assembly fixedly connected to the outer side of the bottom end of the drilling assembly.

[0008] The drilling assembly includes a drill barrel, a fixing frame is fixedly sleeved at the bottom end of the drill barrel, and three bolt shafts are threadedly sleeved on the outer side of the fixing frame. Each bolt shaft has a fixing nut at its bottom end.

[0009] The water level observation assembly includes a water level cylinder, with a connecting pipe fixedly connected to the bottom end of the water level cylinder. The body of the connecting pipe is connected to the drill pipe. A movable box is movably fitted inside the water level cylinder. An air pressure chamber is provided inside the movable box. A partition is fixedly installed inside the movable box. A left electromagnet is fixedly connected to the left side of the partition, and a right electromagnet is fixedly connected to the right side of the partition. The front magnetic pole of the left electromagnet after being energized is the N pole, and the front magnetic pole of the right electromagnet after being energized is the S pole.

[0010] Furthermore, a drilling screw is movably sleeved inside the drill barrel, and a central shaft is fixedly sleeved at the middle of the drilling screw. A motor is fixedly connected to the upper end of the central shaft, and a mounting bracket is provided at the bottom end of the motor. The outer side of the mounting bracket is provided with evenly distributed protrusions, each of which has a sleeve hole. A bearing is movably sleeved between the central shaft and the mounting bracket.

[0011] Furthermore, the cleaning assembly includes a water pressure ring box, the bottom end of which is fixedly connected to a uniformly distributed connecting pipe. The connecting pipe is connected to the sleeve holes opened by the protrusion, and the bottom end of each sleeve hole opened by the protrusion is fixedly connected to a cavity column. The inner side of each cavity column is provided with uniformly distributed one-way pressure valves. A piston shaft is movably sleeved on the inner side of the cavity column. The bottom end of the piston shaft is fixedly connected to a fixing ring, which is fixedly sleeved on the outer side of the drill barrel.

[0012] Furthermore, a receiving plate is fixedly sleeved on the shaft of the hollow column, the receiving plate has evenly distributed filter holes, the center of the receiving plate is movably sleeved with the tube body of the drill barrel, a limit ring is fixedly sleeved on the bottom end of the shaft of the hollow column, a hose is fixedly connected to the outside of the water pressure ring box, a water pump is fixedly connected to the bottom end of the hose, and an external pipe is fixedly connected to the input end of the water pump.

[0013] Furthermore, the receiving assembly includes a receiving cylinder, the bottom end of which is fixedly sleeved with the tube body of the drill barrel, the inner side of which is movably sleeved with a receiving plate, and a uniformly distributed pressure pump is fixedly installed at the bottom end of the receiving cylinder, with a drain pipe fixedly connected to the output end of each pressure pump.

[0014] Furthermore, a sealing plate is fixedly connected to the upper end of the active box, and a shaft support plate is provided at both the upper and lower ends of the water level cylinder. An installation shaft is fixedly connected between the shaft support plates. A uniformly distributed water level plate is movably sleeved on the shaft body of the installation shaft. A first permanent magnet plate is fixedly installed on the front and back of the left side panel of the water level plate, respectively. The magnetic poles on the back and front of the first permanent magnet plate are both N poles. A central iron plate is provided between the first permanent magnet plates. The central iron plate can reduce the repulsive force between the two first permanent magnet plates that repel each other, thereby facilitating their fixed installation. A second permanent magnet plate is fixedly installed on the right side panel of the water level plate. The magnetic pole on the back of the second permanent magnet plate is N pole, and the magnetic pole on the front of the second permanent magnet plate is S pole. A fixing ring is provided at both the upper and lower ends of the water level plate. The fixing ring is fixedly sleeved on the shaft body of the installation shaft. A torsion spring is fixedly connected between the fixing ring and the water level plate. In its natural state, the water level plate is in the above-mentioned magnetic pole distribution state. A scale strip is fixedly provided on the back of the left side panel of the water level plate.

[0015] The technical effects and advantages of this invention are as follows:

[0016] 1. This invention includes a cleaning component. When in use, the external pipe can be connected to a water source, and a water pump is used to pump the water into the hollow column, causing the hollow column to move upwards. Similarly, after the water is pumped out of the hollow column, the hollow column moves downwards, driving the drilling screw blades downwards, thus achieving the downward feeding function of the drilling screw blades. After drilling is completed, the water pump continuously pumps water into the hollow column, causing the hollow column to drive the drilling screw blades upwards. At this time, the drilling screw blades are covered with soil and gravel brought out during the drilling process. When the hollow column reaches its highest point, the water pump continues to pump water into the hollow column. After reaching a certain water pressure, the one-way pressure valve opens and sprays water towards the inner drilling screw blades to rinse them, thereby achieving the soil cleaning effect.

[0017] 2. This invention includes a water level observation component. After the drilling screw completes the underground drilling work, the hole is continuously enlarged to allow the device to be placed inside the underground hole. When groundwater flows into the drill cylinder, it flows into the water level cylinder synchronously through the connecting pipe under the action of the communicating vessel. The water level in the water level cylinder is consistent with the groundwater level. Under the buoyancy of the air compressor chamber, the left and right electromagnets move upward. After they are consistent with the water level, the left electromagnet repels the first permanent magnet plate of the same height, and the right electromagnet attracts the second permanent magnet plate of the same height, causing the water level plate to flip. After flipping, the left and right electromagnets simultaneously attract the magnetic poles on both sides of the flipped water level plate, so that the water level plate can be stably maintained at the position of 180 degrees flipped. The scale bar makes it convenient for the staff to observe and record the water level. After the recording is completed and the magnetic force is lost, the water level plate is rotated back to its original position under the action of the torsion spring. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the drilling assembly structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the cleaning component structure of the present invention.

[0021] Figure 4 This is a cross-sectional structural diagram of the cleaning component of the present invention.

[0022] Figure 5 This is a schematic cross-sectional view of the receiving component of the present invention.

[0023] Figure 6 This is a schematic diagram of the water level observation component of the present invention.

[0024] Figure 7 This is a partial cross-sectional structural diagram of the water level observation component of the present invention.

[0025] The attached reference numerals are as follows: 1. Drilling assembly; 101. Drill barrel; 102. Fixing bracket; 103. Bolt shaft; 104. Fixing bolt; 105. Drilling bolt; 106. Central shaft; 107. Motor; 108. Mounting bracket; 109. Plug; 110. Bearing; 2. Cleaning assembly; 201. Hydraulic ring box; 202. Connecting pipe; 203. Hollow column; 204. One-way pressure valve; 205. Piston shaft; 206. Fixing ring; 207. Receiving plate; 208. Limiting ring; 209. Hose; 210. Water pump; 211. External... 3. Connecting pipe; 4. Container assembly; 5. Container cylinder; 6. Pressure pump; 7. Drain pipe; 8. Water level observation assembly; 9. Water level cylinder; 10. Connecting pipe; 11. Movable box; 12. Air compressor chamber; 13. Partition plate; 14. Left electromagnet; 15. Right electromagnet; 16. Sealing plate; 27. Shaft support plate; 38. Mounting shaft; 49. Water level plate; 200. First permanent magnet plate; 311. Center iron plate; 42. Second permanent magnet plate; 43. Fixing ring; 44. Torsion spring; 55. Scale bar. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The groundwater level monitoring device involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Reference Figure 1The present invention provides a groundwater level observation device, including a drilling assembly 1, a cleaning assembly 2 at the upper end of the drilling assembly 1, a receiving assembly 3 on the outer side of the cleaning assembly 2, and a water level observation assembly 4 fixedly connected to the outer side of the bottom end of the drilling assembly 1.

[0028] In this embodiment, the drilling assembly 1 is used to perform underground drilling, the cleaning assembly 2 is used to provide the power required for underground drilling, the collecting assembly 3 is used to collect the soil and some water brought out by the underground drilling, and the water level observation assembly 4 is used to display and observe the water level of the underground water source in the drilling area. The specific structure and working principle of each of the above components will be explained in detail later.

[0029] Reference Figure 2 and Figure 4 The drilling assembly 1 includes a drill barrel 101. A fixing frame 102 is fixedly sleeved at the bottom end of the drill barrel 101. Three bolt shafts 103 are threadedly sleeved on the outside of the fixing frame 102. Each bolt shaft 103 has a fixing screw 104 at its bottom end. Drilling screw 105 is movably sleeved inside the drill barrel 101. A central shaft 106 is fixedly sleeved at the middle of the drilling screw 105. A motor 107 is fixedly connected to the upper end of the central shaft 106. A mounting frame 108 is provided at the bottom end of the motor 107. Evenly distributed protrusions 109 are provided on the outside of the mounting frame 108. Each protrusion 109 has a sleeve hole. A bearing 110 is movably sleeved between the central shaft 106 and the mounting frame 108.

[0030] In this embodiment, the drill barrel 101 can be fixed on the measured area using the bolt shaft 103 and the fixing screw 104. Driven by the motor 107, the central shaft 106 drives the drilling screw 105 to rotate. With the assistance of the subsequent feed motion, the drilling screw 105 rotates to drill holes in the soil below. Its downward feed motion will be described in detail later.

[0031] Reference Figure 3 and Figure 4The cleaning assembly 2 includes a water pressure ring box 201. The bottom end of the water pressure ring box 201 is fixedly connected to evenly distributed connecting pipes 202. The connecting pipes 202 are respectively connected to the sleeve holes opened in the protrusion 109. The bottom end of each sleeve hole opened in the protrusion 109 is fixedly connected to a cavity column 203. The inner side of each cavity column 203 is provided with evenly distributed one-way pressure valves 204. A piston shaft 205 is movably sleeved on the inner side of the cavity column 203. The bottom end of the piston shaft 205 is fixedly connected to a fixing ring 206. Ring 206 is fixedly sleeved on the outer side of drill barrel 101. A receiving plate 207 is fixedly sleeved on the shaft of cavity column 203. The receiving plate 207 has evenly distributed filter holes. The center of the receiving plate 207 is movably sleeved with the tube body of drill barrel 101. A limit ring 208 is fixedly sleeved on the bottom end of the shaft of cavity column 203. A hose 209 is fixedly connected to the outside of water pressure ring box 201. A water pump 210 is fixedly connected to the bottom end of the hose 209. An external pipe 211 is fixedly connected to the input end of water pump 210.

[0032] In this embodiment, the external pipe 211 can be connected to an external water source, and the water pump 210 can pump the water source into the cavity column 203, thereby causing the cavity column 203 to move upward. Similarly, after the water pump 210 extracts the water from the cavity column 203, the cavity column 203 moves downward and drives the drilling screw 105 to move downward, thereby realizing the downward feeding function of the drilling screw 105. After drilling is completed, the water pump 210 continuously pumps water into the cavity column 203, thereby causing the cavity column 203 to drive the drilling screw 105 to move upward. At this time, the drilling screw 105 is covered with soil and gravel brought out during the drilling work. When the cavity column 203 moves to the highest point, the water pump 210 continues to pump water into the cavity column 203. After reaching a certain water pressure, the one-way pressure valve 204 opens and sprays water towards the drilling screw 105 inside to rinse it, thereby achieving the soil cleaning effect.

[0033] Reference Figure 5 The receiving assembly 3 includes a receiving cylinder 301. The bottom end of the receiving cylinder 301 is fixedly sleeved with the tube body of the drill cylinder 101. The inner side of the receiving cylinder 301 is movably sleeved with the receiving plate 207. The bottom end of the receiving cylinder 301 is fixedly installed with a uniformly distributed pressure pump 302. The output end of the pressure pump 302 is fixedly connected with a drain pipe 303.

[0034] In this embodiment, when the one-way pressure valve 204 is cleaning the drilled screw 105, the water will be collected by the receiving plate 207. The water will enter the bottom space of the receiving cylinder 301 through the filter holes opened in the receiving plate 207. The soil solids will accumulate on the upper part of the receiving plate 207, and the soil solids will be easily cleaned after the receiving plate 207 moves upward. The wastewater at the bottom will be discharged to the outside through the pressure pump 302 and the drain pipe 303.

[0035] Reference Figure 6 and Figure 7 The water level observation component 4 includes a water level cylinder 401. A connecting pipe 402 is fixedly connected to the bottom end of the water level cylinder 401. The pipe body of the connecting pipe 402 is connected to the drill barrel 101. A movable box 403 is movably fitted inside the water level cylinder 401. An air pressure chamber 404 is provided inside the movable box 403. A partition 405 is fixedly installed inside the movable box 403. A left electromagnet 406 is fixedly connected to the left side of the partition 405, and a right electromagnet 407 is fixedly connected to the right side of the partition 405. The front magnetic pole of the left electromagnet 406 after energization is the N pole, and the front magnetic pole of the right electromagnet 407 after energization is the S pole. A sealing plate 408 is fixedly connected to the upper end of the movable box 403. Shaft support plates 409 are provided at both the upper and lower ends of the water level cylinder 401. A mounting shaft 410 is fixedly connected between the shaft support plates 409. Water level plates 411 are movably fitted onto the shaft body of the mounting shaft 410. The front and back of the left side panel of the water level plate 411 are respectively fixedly installed with a first permanent magnet plate 412. The magnetic poles of the back and front of the first permanent magnet plate 412 are both N poles. A central iron plate 413 is provided between the first permanent magnet plates 412. The central iron plate 413 can reduce the repulsive force between the two first permanent magnet plates 412 that repel each other, thereby facilitating their fixed installation. The right side panel of the water level plate 411 is fixedly installed with a second permanent magnet plate 414. The magnetic pole of the back of the second permanent magnet plate 414 is N pole, and the magnetic pole of the front of the second permanent magnet plate 414 is S pole. The upper and lower ends of the water level plate 411 are provided with fixing rings 415. The fixing rings 415 are fixedly sleeved with the shaft of the mounting shaft 410. A torsion spring 416 is fixedly connected between the fixing rings 415 and the water level plate 411. In the natural state, the water level plate 411 is in the above-mentioned magnetic pole distribution state. The back of the left side panel of the water level plate 411 is fixedly provided with scale strips 417.

[0036] In this embodiment, after the drilling screw 105 completes the underground drilling work, the hole is continuously enlarged so that the device can be placed inside the underground hole. When groundwater flows into the drill cylinder 101, under the action of the communicating vessel, the groundwater will flow into the water level cylinder 401 through the communicating pipe 402, and the water level in the water level cylinder 401 will be consistent with the groundwater level. Under the buoyancy of the air compressor chamber 404, the left electromagnet 406 and the right electromagnet 407 will move upward. After they are consistent with the water level, the left electromagnet 406 moves upward. Magnet 406 repels the first permanent magnet plate 412 of the same height, while right electromagnet 407 attracts the second permanent magnet plate 414 of the same height, causing the water level plate 411 to flip. After flipping, left electromagnet 406 and right electromagnet 407 simultaneously attract the magnetic poles on both sides of the flipped water level plate 411, thus allowing the water level plate 411 to be stably maintained at a flipped 180-degree position. The scale bar 417 facilitates the observation and recording of the water level height by the staff. After the recording is completed and the magnetic force is lost, the water level plate 411 is rotated back to its original position under the action of torsion spring 416.

[0037] The working principle and beneficial effects of this invention are as follows: When the device is in use, the external pipe 211 can be connected to a water source, and the water pump 210 pumps the water source into the cavity column 203, thereby causing the cavity column 203 to move upward. Similarly, after the water pump 210 extracts the water from the cavity column 203, the cavity column 203 moves downward and drives the drilling screw 105 to move downward, thereby realizing the downward feeding function of the drilling screw 105. After drilling is completed, the water pump 210 continuously pumps water into the cavity column 203. The hollow column 203 drives the drilling screw 105 upward, causing it to move upward. At this point, the drilling screw 105 is covered with soil and gravel brought up during the drilling process. When the hollow column 203 reaches its highest point, the water pump 210 continues to pump water into the hollow column 203. Once a certain water pressure is reached, the one-way pressure valve 204 opens and sprays water towards the inner drilling screw 105 to clean the soil. After the drilling screw 105 completes the underground drilling work, it continuously cleans the hole... The borehole is enlarged to allow the device to be inserted into the underground borehole. When groundwater flows into the drill pipe 101, it is simultaneously drawn into the water level cylinder 401 via the connecting pipe 402, under the action of the communicating vessel. The water level in the water level cylinder 401 is consistent with the groundwater level. Under the buoyancy of the air compressor chamber 404, the left electromagnet 406 and the right electromagnet 407 move upwards. Once they are aligned with the water level, the left electromagnet 406 repels the first permanent magnet of the same height. The magnetic plate 412 and the right electromagnet 407 attract the second permanent magnet plate 414 of the same height, thereby causing the water level plate 411 to flip. After flipping, the left electromagnet 406 and the right electromagnet 407 simultaneously attract the magnetic poles on both sides of the flipped water level plate 411, so that the water level plate 411 can be stably maintained in the position of flipped 180 degrees. The scale bar 417 makes it convenient for staff to observe and record the water level height. After the recording is completed and the magnetic force is lost, the water level plate 411 is rotated back to its original position under the action of the torsion spring 416.

[0038] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0039] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0040] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A groundwater level observation device characterized by comprising: The device includes a drilling assembly (1), a cleaning assembly (2) is provided at the upper end of the drilling assembly (1), a receiving assembly (3) is provided on the outer side of the cleaning assembly (2), and a water level observation assembly (4) is fixedly connected to the outer side of the bottom end of the drilling assembly (1). The drilling assembly (1) includes a drill barrel (101), a fixing frame (102) is fixedly sleeved at the bottom end of the drill barrel (101), and three bolt shafts (103) are threadedly sleeved on the outer side of the fixing frame (102). Each bolt shaft (103) has a fixing screw (104) at the bottom end of its shaft. The water level observation component (4) includes a water level cylinder (401), a connecting pipe (402) is fixedly connected to the bottom end of the water level cylinder (401), the pipe body of the connecting pipe (402) is connected to the drill pipe (101), a movable box (403) is movably sleeved inside the water level cylinder (401), an air compressor chamber (404) is provided inside the movable box (403), a partition (405) is fixedly installed inside the movable box (403), a left electromagnet (406) is fixedly connected to the left side of the partition (405), a right electromagnet (407) is fixedly connected to the right side of the partition (405), the front magnetic pole of the left electromagnet (406) after being energized is the N pole, and the front magnetic pole of the right electromagnet (407) after being energized is the S pole; The drill barrel (101) is movably sleeved with a drilling screw (105), and a central shaft (106) is fixedly sleeved at the middle of the drilling screw (105). A motor (107) is fixedly connected to the upper end of the shaft of the central shaft (106). A mounting bracket (108) is provided at the bottom end of the motor (107). The outer side of the mounting bracket (108) is provided with evenly distributed protrusions (109). Each protrusion (109) has a sleeve hole. A bearing (110) is movably sleeved between the shaft of the central shaft (106) and the mounting bracket (108). The cleaning assembly (2) includes a water pressure ring box (201). The bottom end of the water pressure ring box (201) is fixedly connected to a uniformly distributed connecting pipe (202). The connecting pipe (202) is connected to the sleeve holes opened by the protrusion (109). The bottom end of the sleeve holes opened by the protrusion (109) is fixedly connected to a cavity column (203). The inner side of the cavity column (203) is provided with uniformly distributed one-way pressure valves (204). The inner side of the cavity column (203) is movably sleeved with a piston shaft (205). The bottom end of the piston shaft (205) is fixedly connected to a fixing ring (206). The fixing ring (206) is fixedly sleeved on the outer side of the drill barrel (101).

2. A groundwater level observation device according to claim 1, characterized in that: The hollow column (203) has a fixed sleeve with a receiving plate (207) on its shaft. The receiving plate (207) has evenly distributed filter holes. The center of the receiving plate (207) is movably sleeved with the tube body of the drill barrel (101). The bottom end of the shaft of the hollow column (203) is fixedly sleeved with a limit ring (208). The outside of the water pressure ring box (201) is fixedly connected with a hose (209). The bottom end of the hose (209) is fixedly connected with a water pump (210). The input end of the water pump (210) is fixedly connected with an external pipe (211).

3. The groundwater level observation device according to claim 1, characterized by: The receiving assembly (3) includes a receiving cylinder (301), the bottom end of which is fixedly sleeved with the tube body of the drill barrel (101), the inner side of which is movably sleeved with the receiving plate (207), and a uniformly distributed pressure pump (302) is fixedly installed at the bottom end of the receiving cylinder (301). The output ends of the pressure pump (302) are all fixedly connected to a drain pipe (303).

4. The groundwater level observation device according to claim 1, characterized by: A sealing plate (408) is fixedly connected to the upper end of the movable box (403). Shaft support plates (409) are provided at both the upper and lower ends of the water level cylinder (401). An installation shaft (410) is fixedly connected between the shaft support plates (409). The shaft of the installation shaft (410) is movably sleeved with evenly distributed water level plates (411). First permanent magnet plates (412) are fixedly installed on the front and back of the left side panel of the water level plate (411), respectively. The magnetic poles on the back and front of the first permanent magnet plates (412) are both N poles. A central iron plate (413) is provided between the first permanent magnet plates (412). The central iron plate (413) can weaken the repulsive force between the two mutually repelling first permanent magnet plates (412). For ease of installation, a second permanent magnet plate (414) is fixedly installed on the right side panel of the water level plate (411). The magnetic pole on the back of the second permanent magnet plate (414) is N pole, and the magnetic pole on the front of the second permanent magnet plate (414) is S pole. The upper and lower ends of the water level plate (411) are provided with fixing rings (415). The fixing rings (415) are fixedly sleeved with the shaft of the mounting shaft (410). A torsion spring (416) is fixedly connected between the fixing rings (415) and the water level plate (411). In the natural state, the water level plate (411) is in the above-mentioned magnetic pole distribution state. The back of the left side panel of the water level plate (411) is fixedly provided with scale strips (417).

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