Water level measuring device for hydropower plant with anti-clogging function

Abstract

The present application relates to the technical field of power plant water level measurement, in particular to a water level measuring device for hydraulic power plant with anti-clogging function, comprising a dam base, the lower surface of the dam base is fixed with a base plate through an adjustable support, the inside of the mounting plate is fixed with a plurality of connecting columns through bolts, the bottom end of a plurality of connecting columns is fixed with the same mounting plate, the lower surface of the mounting plate is fixed with a protective cover, and the mounting plate is provided with an anti-clogging mechanism for cleaning the protective cover. The water level measuring device for hydraulic power plant with anti-clogging function drives the hollow rod and the cleaning assembly to rotate through the motor drive gear set, and cooperates with the synergistic effect of the inflatable cleaning head and the fixed scraper to realize omnidirectional and dead angle-free cleaning of the surface of the protective cover. After inflation and expansion, the inflatable cleaning head can tightly fit the curved surface area at the center of the protective cover, and effectively remove the blind area silt under the radar beam which is easily ignored by the rigid scraper by using flexible materials.

Description

Technical Field

[0001] This invention relates to the field of power plant water level measurement technology, specifically to a hydroelectric power plant water level measurement device with anti-siltation function. Background Technology

[0002] Water level measurement is a core component of the operation monitoring and safe dispatching of hydropower plants. Radar level gauges are widely used in various hydrological monitoring scenarios due to their advantages such as non-contact measurement and relatively convenient installation and maintenance. In practical engineering applications, to ensure the transmission quality of the radar beam and protect internal precision components, a transparent or wave-transparent protective cover is usually installed on the outside of the radar transmitter to resist water flow impact and damage from foreign objects. However, the hydropower station environment is complex, and the water often contains a large amount of impurities such as silt, algae, aquatic plants, and floating garbage. During long-term operation, these impurities are very likely to adhere to the surface of the protective cover or form a silt accumulation layer around the probe. As the degree of siltation deepens, it will not only change the physical properties of the protective cover surface, but may also absorb or scatter microwave signals, thereby affecting the accuracy and stability of water level measurement. Therefore, how to effectively prevent siltation on the surface of the protective cover in the underwater environment and keep it clean has become one of the key technical issues for improving the long-term operational reliability of radar level gauges.

[0003] Although various anti-clogging devices have emerged in existing technologies, such as mechanical scraping mechanisms or high-pressure water flushing systems, they still have significant shortcomings in practical applications. First, traditional rigid scraping structures often fail to perfectly fit the central curved area of ​​the protective cover, resulting in a cleaning blind spot in the central area directly below the radar beam, where sludge is difficult to remove once deposited. Second, the media delivery pipelines of existing cleaning devices are mostly directly connected to rotating components, lacking effective rotation sealing and avoidance designs. When the cleaning components rotate with the motor, the connecting water pipes are prone to tangling and breakage. Furthermore, if the inflatable flexible cleaning head is not properly avoided when not in operation, it can easily block the radar transmitter's beam path, causing signal interference or measurement errors. Therefore, there is an urgent need for a new anti-clogging structure that can achieve all-round, blind-spot-free cleaning while ensuring continuous media supply without interfering with radar signals. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a hydroelectric power plant water level measuring device with anti-siltation function, which has the advantages of high efficiency in decontamination through mechanical and hydraulic synergy, and solves the problem of silt easily adhering to the protective cover of traditional radar water level gauges in complex hydrological environments.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hydroelectric power plant water level measuring device with anti-siltation function, comprising a dam base, a base plate fixed to the lower surface of the dam base by an adjustable bracket, a plurality of connecting columns fixed to the inside of the mounting plate by bolts, the bottom ends of the plurality of connecting columns being fixed to the same mounting plate, a protective cover fixed to the lower surface of the mounting plate, an anti-siltation mechanism for cleaning the protective cover being provided on the mounting plate, and a radar transmitter fixed to the lower surface of the mounting plate and inside the protective cover; The anti-siltation mechanism includes a cleaning component and an auxiliary component, with the auxiliary component used to improve the cleaning effect of the cleaning component. The cleaning component specifically includes the following: Motor: It is fixed to the lower surface of the base plate, and the output shaft is vertically downward; Side panel: It is fixed to the left side of the mounting plate and is horizontally positioned; Connecting column: It is rotatably connected to the inside of the side plate via a bearing and is fixed to one end of the motor output shaft; Gear A: It is fixed to the bottom end of the connecting column; Gear B: It is rotatably connected to the outside of the protective cover, and the two are inseparable, while meshing with gear A; Hollow rods: There are two of them, symmetrically distributed, and both are fixed to gear B; Connecting ring: It is connected and fixed to the top of the two hollow rods; Cleaning pads: There are two of them, each connected and fixed to the bottom end of a hollow rod. Inflatable cleaning head: It is connected and fixed to the bottom of the two cleaning plates respectively.

[0006] Furthermore, the auxiliary components include a fan and a water pump respectively fixed on the left and right sides of the upper surface of the mounting plate. The water inlet of the water pump is connected to an external water source through a pipe, and the water outlet of the water pump is connected to and fixed with a connecting water pipe. The other end of the connecting water pipe is connected to and fixed with the right side of the connecting ring. The air outlet of the fan is connected to and fixed with a connecting air pipe, and the other end of the connecting air pipe is connected to and fixed with the left side of the connecting ring.

[0007] Furthermore, the auxiliary component also includes multiple high-pressure nozzles that are fixed in communication with the cleaning plate, and the high-pressure nozzles face the protective cover.

[0008] Furthermore, gear B is a ring gear, and the outer wall of the protective cover is provided with a ring guide rail or a ring groove. Gear B is rotatably sleeved in the ring guide rail or ring groove to achieve rotational connection and axial positioning with the protective cover.

[0009] Furthermore, the hollow rod, connecting ring, cleaning plate, and inflatable cleaning head are internally interconnected, forming a cleaning medium flow channel. The connecting ring is equipped with a rotary joint, and the connecting water pipe and connecting air pipe are respectively connected to the connecting ring through the rotary joint to maintain the continuity of medium delivery when the hollow rod is rotated by gear B.

[0010] Furthermore, the inflatable cleaning head has an elastic bladder structure made of corrosion-resistant rubber or silicone. In its natural state, it is flat and contracted, but expands into a hemispherical or ellipsoidal shape after pressurized water or pressurized gas is introduced.

[0011] Furthermore, the air inlet of the fan is connected to an external heat source to deliver hot air into the medium channel formed by the connecting ring, hollow rod, cleaning plate and inflatable cleaning head, and spray it out toward the outer wall of the protective cover through the high-pressure nozzle to prevent the outer wall of the protective cover from freezing in winter.

[0012] Furthermore, the protective cover is a closed transparent cover with a wave-transparent window in the center of its bottom area, through which the microwaves emitted by the radar transmitter enter the water; the inflatable cleaning head is located outside the area directly below the wave-transparent window when it is in the retracted state.

[0013] Furthermore, the cleaning blade is a flexible scraper with polyurethane bristles or silicone blades on its working surface. The cleaning blade performs mechanical scraping and cleaning of the outer wall of the protective cover when it rotates with gear B.

[0014] Furthermore, the adjustable bracket includes a guide sleeve vertically fixed to the lower surface of the dam foundation and an adjusting rod slidably inserted inside the guide sleeve. The bottom end of the adjusting rod is fixed to the base plate, and a locking bolt is provided between the guide sleeve and the adjusting rod for adjusting the water immersion depth of the mounting plate and the protective cover.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. This hydroelectric power plant water level measuring device with anti-clogging function achieves all-round, no-dead-angle cleaning of the protective cover surface by setting up a motor-driven gear set to rotate the hollow rod and cleaning components, and cooperating with the inflatable cleaning head and fixed scraper. After inflation, the inflatable cleaning head can closely fit the curved area in the center of the protective cover, and effectively remove the silt in the blind spot directly below the radar beam that is easily ignored by the rigid scraper by using flexible materials. At the same time, the motor controls the cleaning components to perform periodic forward and reverse rotation, which not only expands the cleaning coverage area, but also enhances the removal of sticky stains through bidirectional scraping, significantly improving the accuracy of water level measurement and the reliability of long-term operation.

[0016] 2. This hydroelectric power plant water level measuring device with anti-clogging function uses specific hot air injection holes / channels set inside or on the side wall of the air-filled cleaning head. This allows hot air to be sprayed from the surface of the cleaning head towards the outer wall of the protective cover at a specific angle. This directional hot air flow not only accelerates the evaporation of water after cleaning and prevents secondary condensation or icing, but also uses the shear force of the airflow to further peel off the tiny particles attached to the surface of the protective cover. This forms a composite cleaning mechanism of mechanical scraping + fluid flushing + hot air drying. Compared with the traditional single water rinsing or static heating method, this hot air direction design significantly improves the cleaning efficiency. Especially in low temperature and high humidity environments, it can effectively avoid measurement failure caused by water vapor condensation or icing on the surface of the protective cover, ensuring the stable operation of the equipment under various harsh conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the anti-siltation mechanism of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 This is a schematic diagram of the cleaning component structure of the present invention.

[0018] In the diagram: 1 Dam base, 2 Base plate, 3 Connecting column, 4 Mounting plate, 5 Protective cover, 6 Anti-siltation mechanism, 61 Cleaning component, 601 Motor, 602 Side plate, 603 Transmission column, 604 Gear A, 605 Gear B, 606 Hollow rod, 607 Connecting ring, 608 Cleaning plate, 609 Inflatable cleaning head, 62 Auxiliary component, 621 Fan, 622 Water pump, 623 Connecting water pipe, 624 Connecting air duct, 625 High-pressure nozzle, 7 Radar transmitter. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1A water level measuring device for a hydroelectric power plant with anti-siltation function includes a dam base 1. A base plate 2 is fixed to the lower surface of the dam base 1 by an adjustable bracket. Several connecting columns 3 are fixed inside the mounting plate 2 by bolts. The bottom ends of the several connecting columns 3 are fixed to the same mounting plate 4. A protective cover 5 is fixed to the lower surface of the mounting plate 4. An anti-siltation mechanism 6 for cleaning the protective cover 5 is provided on the mounting plate 4. A radar transmitter 7 is fixed to the lower surface of the mounting plate 4 and inside the protective cover 5. The anti-siltation mechanism 6 includes a cleaning component 61 and an auxiliary component 62. The auxiliary component is used to improve the cleaning effect of the cleaning component 61. The cleaning component 61 specifically includes the following: Motor 601: It is fixed to the lower surface of the base plate 2, and its output shaft is vertically downward; Side panel 602: It is fixed to the left side of the mounting plate 4 and is horizontally positioned; Connecting column 603: It is rotatably connected to the inside of the side plate 602 via a bearing and is fixed to one end of the output shaft of the motor 601; Gear A604: It is fixed to the bottom end of the connecting post 603; Gear B605: It is rotatably connected to the outside of the protective cover 5, and the two are inseparable, while meshing with gear A604. Hollow rod 606: There are two of them, which are symmetrically distributed and are both fixed to gear B605; Connecting ring 607: It is connected and fixed to the top ends of the two hollow rods 606; Cleaning pad 608: There are two of them, which are respectively connected and fixed to the bottom ends of two hollow rods 606. Inflatable cleaning head 609: It is connected and fixed to the bottom of the two cleaning plates 608 respectively.

[0021] The motor 601 drives the gear A604 to mesh with the ring gear B605, which in turn drives the symmetrically distributed hollow rod 606, cleaning plate 608 and inflatable cleaning head 609 to rotate, thus realizing all-round mechanical scraping and cleaning of the outer wall of the protective cover 5. This effectively solves the problems of traditional fixed cleaning methods that cannot cover blind spots and are not thorough.

[0022] The auxiliary component 62 includes a fan 621 and a water pump 622, which are respectively fixed to the left and right sides of the upper surface of the mounting plate 4. The water inlet of the water pump 622 is connected to an external water source through a pipe, and the water outlet of the water pump 622 is connected to and fixed with a connecting water pipe 623. The other end of the connecting water pipe 623 is connected to and fixed with the right side of the connecting ring 607. The air outlet of the fan 621 is connected to and fixed with a connecting air pipe 624. The other end of the connecting air pipe 624 is connected to and fixed with the left side of the connecting ring 607.

[0023] By introducing a water pump 622 and a blower 621 as auxiliary power sources, water and air are supplied to the rotating connecting ring 607 through a water pipe 623 and an air pipe 624, respectively, forming a synergistic effect of "mechanical scraping + fluid flushing", which significantly improves the efficiency of removing stubborn sludge and algae.

[0024] The auxiliary component 62 also includes a plurality of high-pressure nozzles 625 that are connected and fixed to the cleaning plate 608, and the high-pressure nozzles 625 face the protective cover 5.

[0025] A high-pressure nozzle 625 facing the protective cover 5 is added to the cleaning plate 608. The high-pressure water flow directly impacts the surface where dirt adheres, further enhancing the cleaning ability, ensuring the cleanliness of the radar transmission window surface, and guaranteeing the stable transmission of measurement signals.

[0026] Among them, gear B605 is a ring gear, and the outer wall of the protective cover 5 is provided with a ring guide rail or a ring groove. Gear B605 is rotatably sleeved in the ring guide rail or ring groove to achieve rotational connection and axial limit with the protective cover 5.

[0027] The ring gear B605 is fitted into the ring guide rail or groove on the outer wall of the protective cover 5, which realizes stable rotational connection and axial limit, ensuring the structural stability and motion accuracy of the cleaning mechanism during long-term operation, and avoiding detachment or jamming caused by vibration.

[0028] The hollow rod 606, connecting ring 607, cleaning plate 608, and inflatable cleaning head 609 are interconnected to form a cleaning medium flow channel. The connecting ring 607 is equipped with a rotary joint, and the connecting water pipe 623 and connecting air pipe 624 are respectively connected to the connecting ring 607 through the rotary joint to maintain the continuity of medium delivery when the gear B605 drives the hollow rod 606 to rotate.

[0029] The rotary joint enables continuous media transport between the stationary pipeline connecting water pipe 623, air pipe 624 and rotating component connecting ring 607, etc., solving the problem of water and air connection in the rotating state, ensuring the continuous supply of water and air during the cleaning process, and improving the reliability and maintenance convenience of the system.

[0030] Among them, the inflatable cleaning head 609 has an elastic bladder structure, which is made of corrosion-resistant rubber or silicone. In its natural state, it is flat and contracted, and expands into a hemispherical or ellipsoidal shape after pressurized water or pressurized gas is introduced.

[0031] The 609 inflatable cleaning head uses an elastic bladder made of corrosion-resistant rubber or silicone, which has the function of contraction and expansion. After the pressure medium is introduced, it can expand and fit the curved surface of the protective cover, especially forming a full-coverage cleaning in the central area, which solves the technical pain point that traditional rigid scrapers have difficulty in handling the curved central blind area.

[0032] The fan 621 has an external heat source connected to its air inlet, which is used to deliver hot air into the medium channel formed by the connecting ring 607, hollow rod 606, cleaning plate 608, and air-filled cleaning head 609. The hot air is then sprayed out through the high-pressure nozzle 625 toward the outer wall of the protective cover 5 to prevent icing on the outer wall of the protective cover 5 in winter. The fan 621, with its external heat source, sprays hot air onto the outer wall of the protective cover 5 through the medium channel, effectively preventing icing and water mist condensation in winter. This ensures the normal operation and measurement accuracy of the equipment in cold and humid environments, and greatly expands the applicable operating conditions of the device.

[0033] Among them, the protective cover 5 is a closed transparent cover with a wave-transparent window in the center of its bottom. The microwaves emitted by the radar transmitter 7 are transmitted into the water through the wave-transparent window; the inflatable cleaning head 609 is located outside the area directly below the wave-transparent window when it is in the retracted state.

[0034] The ingeniously designed inflatable cleaning head 609 is positioned directly below the radar transmission window in its retracted state, achieving both thorough cleaning coverage and avoiding physical obstruction of the microwave emission path by the cleaning components, thus perfectly balancing the requirements of cleaning function and measurement accuracy.

[0035] Among them, the cleaning plate 608 is a flexible scraper, and its working surface is provided with polyurethane bristles or silicone scraper blades. When the cleaning plate 608 rotates with the gear B605, it performs mechanical scraping and cleaning on the outer wall of the protective cover 5.

[0036] The cleaning plate 608 is made of a flexible material with polyurethane bristles or silicone scraper blades. As it rotates with gear B605, it gently and effectively mechanically scrapes the protective cover 5, which can powerfully remove stains without damaging the surface of the protective cover and extend the service life of the equipment.

[0037] The adjustable support includes a guide sleeve vertically fixed to the lower surface of the dam base 1 and an adjusting rod slidably inserted inside the guide sleeve. The bottom end of the adjusting rod is fixed to the base plate 2. A locking bolt is provided between the guide sleeve and the adjusting rod to adjust the water depth of the mounting plate 4 and the protective cover 5.

[0038] The adjustable bracket, which includes a guide sleeve, adjusting rod and locking bolt, allows the base plate 2 and mounting plate 4 to flexibly adjust the water depth, adapt to different water level changes, simplify the installation and adjustment process, and improve the adaptability and ease of operation of the device under different hydrological conditions.

[0039] The working principle is as follows: Installation positioning and depth adjustment: During the initial deployment phase of the device, it is fixed by the adjustable bracket under the dam base 1. The operator slides the adjusting rod inserted in the guide sleeve to adjust the height of the base plate 2. After fixing it with locking bolts, the mounting plate 4 at the bottom of the several connecting columns 3 that are bolted inside the base plate 2 is adjusted to the predetermined depth. The protective cover 5 fixed on the lower surface of the mounting plate 4 is immersed in the water. The radar transmitter 7 inside it emits microwaves into the water through the wave-transparent window at the bottom. At the same time, the outer wall of the protective cover 5 is at risk of adhering to pollutants such as silt and algae, so the anti-siltation mechanism 6 needs to be activated.

[0040] Power transmission and rotating machinery scraping: When the cleaning mode needs to be activated, the motor 601 fixed on the lower surface of the substrate 2 is powered on and operates. Its vertically downward output shaft drives the connecting column 603 to rotate. The gear A604 fixed at the bottom of the connecting column 603 rotates accordingly. Since the gear A604 meshes with the ring gear B605 installed on the outside of the protective cover 5, and the gear B605 achieves rotational connection and axial limitation through the ring guide rail or groove sleeved on the outer wall of the protective cover, the power of the gear A604 is transmitted to the gear B605, driving the gear B605 to rotate around the axis of the protective cover.

[0041] Gear B605 has two symmetrically distributed hollow rods 606 fixed to it, which rotate synchronously with gear B. The cleaning blade 608 fixed at the bottom of each hollow rod 606 moves along a circumferential trajectory on the outer wall of the protective cover 5. The cleaning blade 608 is a flexible scraper with polyurethane bristles or silicone blades. During the rotation, it continuously mechanically scrapes the outer wall of the protective cover 5, removing most of the sticky sludge and biological dirt.

[0042] Water-driven expansion and central area cleaning: At the same time, the water pump 622 fixed on the upper surface of the mounting plate 4 is started, drawing water from an external water source and delivering it through the connecting water pipe 623. The water flows through the rotary joint on the mounting plate 4 into the connecting ring 607, which is connected and fixed to the top of the two hollow rods 606, and further flows into the closed medium flow channel composed of the hollow rods 606, the connecting ring 607, the cleaning plate 608, and the inflatable cleaning head 609.

[0043] After pressurized water enters the air-cleaning head 609, it expands from its naturally contracted and flat shape into a hemispherical or ellipsoidal shape. The expanded air-cleaning head 609 fits tightly against the curved area in the center of the protective cover 5, using elastic, corrosion-resistant rubber or silicone to remove dirt from the central blind area that the rotating cleaning blade 608 may have missed.

[0044] High-pressure jetting and dual synergistic decontamination: As the water pressure increases, the water flows through multiple high-pressure nozzles 625 fixed on the cleaning plate 608 and is sprayed at high speed toward the outer wall of the protective cover 5. The high-pressure water flow not only directly impacts and washes away dirt, but also forms a dual cleaning mechanism of mechanical scraping and fluid flushing with the rotating cleaning plate 608. This combination significantly improves the removal efficiency of stubborn stains and prevents clogging from remaining on the surface of the protective cover.

[0045] Hot air purging and freeze-drying: To address the issue of icing in winter, the system introduces hot air to assist in cleaning. The fan 621, fixed to the upper surface of the mounting plate 4, is started. Its air inlet is connected to an external heat source. The hot air enters through the connecting duct 624 and then through the rotary joint into the connecting ring 607 and the subsequent media channel. Finally, the hot air is sprayed out towards the outer wall of the protective cover 5 through the high-pressure nozzle 625.

[0046] The function of the hot air is twofold: firstly, to melt the ice layer adhering to the surface of the protective cover 5 through heat conduction; and secondly, to accelerate the evaporation of residual moisture after cleaning, preventing water droplets from refreezing or condensing into fog droplets at low temperatures and interfering with radar signals.

[0047] Pressure relief contraction and signal lossless avoidance: When the cleaning cycle ends, the water pump 622 stops supplying water, the fan 621 stops supplying air, the pressure in the channel decreases, and the air-inflating cleaning head 609 naturally shrinks and returns to its flat shape due to the lack of internal pressure support.

[0048] The retracted inflatable cleaning head 609 is located outside the area directly below the radar transmitter 7's wave-transmitting window, no longer obstructing the radar wave's transmission path. This ensures that, in the non-operating state, the microwaves emitted by the radar transmitter 7 can enter the water without obstruction, guaranteeing the continuity and accuracy of water level measurement and achieving perfect decoupling of the cleaning and measurement functions.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water level measuring device for a hydroelectric power plant with anti-siltation function, characterized in that, The dam base (1) is provided with a base plate (2) fixed to the lower surface of the dam base (1) by an adjustable bracket. Several connecting columns (3) are fixed to the inside of the mounting plate (2) by bolts. The bottom ends of the several connecting columns (3) are fixed to the same mounting plate (4). A protective cover (5) is fixed to the lower surface of the mounting plate (4). An anti-siltation mechanism (6) for cleaning the protective cover (5) is provided on the mounting plate (4). A radar transmitter (7) is fixed to the lower surface of the mounting plate (4) and inside the protective cover (5). The anti-siltation mechanism (6) includes a cleaning component (61) and an auxiliary component (62), and the auxiliary component is used to improve the cleaning effect of the cleaning component (61). The cleaning component (61) specifically includes the following: Motor (601): It is fixed to the lower surface of the base plate (2), and the output shaft is vertically downward; Side panel (602): It is fixed to the left side of the mounting plate (4) and is horizontally positioned; Connecting column (603): It is rotatably connected to the inside of the side plate (602) via a bearing, and is fixed to one end of the output shaft of the motor (601); Gear A (604): It is fixed to the bottom end of the connecting column (603); Gear B (605): It is rotatably connected to the outside of the protective cover (5), and the two are inseparable, while meshing with gear A (604); Hollow rod (606): There are two of them, and they are symmetrically distributed. Both are fixed to gear B (605); Connecting ring (607): It is connected and fixed to the top ends of the two hollow rods (606); Cleaning disc (608): There are two of them, which are respectively connected and fixed to the bottom ends of two hollow rods (606). Inflatable cleaning head (609): It is connected and fixed to the bottom of the two cleaning plates (608).

2. The water level measuring device for a hydroelectric power plant with anti-siltation function according to claim 1, characterized in that: The auxiliary component (62) includes a fan (621) and a water pump (622) respectively fixed on the left and right sides of the upper surface of the mounting plate (4). The water inlet of the water pump (622) is connected to an external water source through a pipe. The water outlet of the water pump (622) is connected to a connecting water pipe (623). The other end of the connecting water pipe (623) is connected to the right side of the connecting ring (607). The air outlet of the fan (621) is connected to a connecting air pipe (624). The other end of the connecting air pipe (624) is connected to the left side of the connecting ring (607).

3. The water level measuring device for a hydroelectric power plant with anti-siltation function according to claim 1, characterized in that: The auxiliary component (62) also includes a plurality of high-pressure nozzles (625) that are fixed in communication with the cleaning plate (608) and the high-pressure nozzles (625) face the protective cover (5).

4. A water level measuring device for a hydroelectric power plant with anti-siltation function according to claim 1, characterized in that: The gear B (605) is a ring gear. The outer wall of the protective cover (5) is provided with a ring guide rail or a ring groove. The gear B (605) is rotatably sleeved in the ring guide rail or ring groove to achieve rotational connection and axial positioning with the protective cover (5).

5. A water level measuring device for a hydroelectric power plant with anti-siltation function according to claim 2, characterized in that: The hollow rod (606), connecting ring (607), cleaning plate (608), and inflatable cleaning head (609) are interconnected internally to form a cleaning medium flow channel. The connecting ring (607) is provided with a rotary joint. The connecting water pipe (623) and connecting air pipe (624) are respectively connected to the connecting ring (607) through the rotary joint to maintain the continuity of medium delivery when the gear B (605) drives the hollow rod (606) to rotate.

6. A water level measuring device for a hydroelectric power plant with anti-siltation function according to claim 1, characterized in that: The inflatable cleaning head (609) is an elastic capsule structure made of corrosion-resistant rubber or silicone. In its natural state, it is flat and contracted, and expands into a hemispherical or ellipsoidal shape after pressurized water or pressurized gas is introduced.

7. A water level measuring device for a hydroelectric power plant with anti-siltation function according to claim 2, characterized in that: The air inlet of the fan (621) is connected to an external heat source to deliver hot air into the medium channel formed by the connecting ring (607), hollow rod (606), cleaning plate (608) and air-filled cleaning head (609), and spray it out toward the outer wall of the protective cover (5) through the high-pressure nozzle (625) to prevent the outer wall of the protective cover (5) from freezing in winter.

8. A water level measuring device for a hydroelectric power plant with anti-siltation function according to claim 1, characterized in that: The protective cover (5) is a closed transparent cover with a wave-transparent window in the center of its bottom. The microwave emitted by the radar transmitter (7) enters the water through the wave-transparent window. The inflatable cleaning head (609) is located outside the area directly below the wave-transparent window in the retracted state.

9. A water level measuring device for a hydroelectric power plant with anti-siltation function according to claim 1, characterized in that: The cleaning blade (608) is a flexible scraper with polyurethane bristles or silicone blades on its working surface. The cleaning blade (608) performs mechanical scraping and cleaning on the outer wall of the protective cover (5) when it rotates with gear B (605).

10. A water level measuring device for a hydroelectric power plant with anti-siltation function according to claim 1, characterized in that: The adjustable bracket includes a guide sleeve vertically fixed to the lower surface of the dam base (1) and an adjusting rod slidably inserted in the guide sleeve. The bottom end of the adjusting rod is fixed to the base plate (2). A locking bolt is provided between the guide sleeve and the adjusting rod to adjust the water depth of the mounting plate (4) and the protective cover (5).

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