Flood prevention riverway water level measuring equipment

Abstract

The utility model belongs to the technical field of flood prevention hydrologic monitoring, particularly relates to flood prevention river channel water level measuring equipment, and provides the following scheme aiming at the problems that existing equipment is poor in water flow impact resistance, large in floating object interference and insufficient in sensor data redundancy complementation. Comprising a telescopic rod assembly, a protective net assembly, a pressure type sensor and a laser phase method distance measuring sensor, and the protective net assembly is arranged on the outer side of the telescopic rod assembly in a covering mode and can effectively prevent floating objects, weeds and the like in water from winding and impacting measuring equipment; the measuring assembly adopts dual configuration of a pressure type sensor and a laser phase method distance measuring sensor to form dual measurement, the pressure type sensor adopts contact measurement, the laser phase method distance measuring sensor adopts non-contact measurement, and the pressure type sensor and the laser phase method distance measuring sensor complement each other to ensure that accurate and reliable water level data can be obtained under different water quality and weather conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to a water level measuring equipment, concretely is a flood control river water level measuring equipment, belongs to flood control hydrological monitoring technical field. BACKGROUND

[0002] In the field of flood control hydrological monitoring, the stability and precision of river water level measuring equipment are directly related to the timeliness and reliability of flood control decision. The water level measuring equipment often adopts a fixed installation structure, lacks adaptability to complex water flow environment, especially in the case of turbulent water flow and increased floating objects during flood season, the traditional equipment is prone to tilting under impact, the sensor is easy to be entangled or interfered, leading to data distortion or equipment damage.

[0003] In the prior art, such as the dam water level monitoring device disclosed in publication No. CN222836578U, a column and sleeve structure are adopted to isolate external waves through the sleeve to reduce the interference of water surface fluctuation on the sensor, but the sleeve structure is fixed and cannot dynamically adjust the protection range with the water level, when the water level changes dramatically or floating objects accumulate in the sleeve opening, the equipment may still be blocked or the measurement accuracy may be affected, although the sleeve can reduce wave interference, it lacks optimization of the overall equipment's water flow impact resistance, and the column structure may be unstable under the impact of flood peak during flood season; such as the water conservancy flood control monitoring system disclosed in publication No. CN119063819B, the water level is monitored through a floating plate and a pressure sensor, and the warning accuracy is improved in combination with rainfall data, but the floating plate and the vertical frame structure are easy to swing in high-speed water flow, and the pressure sensor is directly exposed to the water body, which is easy to be affected by silt accumulation or biological attachment after long-term use, leading to increased measurement error, the simple floating plate structure does not solve the problems of floating object entanglement and sensor protection, and the pressure sensor is easy to be disturbed by environmental factors such as water quality and temperature when working alone, and the reliability is insufficient. In addition, the two types of existing equipment do not integrate multi-sensor redundant measurement and self-adaptive adjustment mechanism, and it is difficult to ensure the continuity and accuracy of data under extreme hydrological conditions. UTILITY MODEL CONTENTS

[0004] The utility model discloses a flood control river water level measuring equipment to solve the problems of poor water flow impact resistance, large floating object interference and insufficient sensor data redundancy complement of existing equipment.

[0005] The utility model discloses a flood control river water level measuring equipment, including telescopic link assembly, protective net component and measuring component, the protective net component covers and sets up at the outside of telescopic link assembly, and measuring component includes pressure type sensor and laser phase method ranging sensor, and the top of telescopic link assembly on the liquid surface is connected with control drive component, and pressure type sensor sets up on the pole body of telescopic link assembly below the liquid surface, and laser phase method ranging sensor installs in control drive component,

[0006] The telescopic rod assembly comprises a prismatic inner rod and a prismatic outer rod, the prismatic inner rod is movably inserted into the prismatic outer rod, a plurality of stable plates arranged in layers and horizontally are fixedly connected to the rod body of the prismatic outer rod, and a pressure sensor is fixedly connected to the stable plates;

[0007] The protective net assembly comprises a cylindrical inner net and a cylindrical outer net, the cylindrical inner net is movably sleeved into the cylindrical outer net, and an annular buoyant plate is connected to the upper end of the cylindrical inner net and always floats on the water surface.

[0008] As a further scheme of the utility model: the prismatic inner rod and the prismatic outer rod both adopt a triangular prism structure, and the bottom end of the prismatic outer rod is fixedly connected with a stone pier base which is sunk into the bottom of the river channel.

[0009] As a further scheme of the utility model: a rotating rod is movably connected in the rod of the prismatic inner rod, a bearing is connected between the rotating rod and the prismatic inner rod, an active cavity and a threaded cavity are formed in the rod of the prismatic outer rod, the threaded cavity is below the active cavity, a threaded rod is fixedly connected to the bottom end of the rotating rod in a coaxial manner, the prismatic inner rod is movably inserted into the active cavity, and the rod body of the threaded rod is screwed into the threaded cavity.

[0010] As a further scheme of the utility model: a plurality of positioning outer pipes uniformly distributed along the circumference are fixedly connected to the outer net body of the cylindrical outer net, a telescopic inner rod is movably inserted into the positioning outer pipe, and the upper end of the telescopic inner rod is fixedly connected to the lower plate surface of the annular buoyant plate.

[0011] As a further scheme of the utility model: a limiting cavity is formed in the pipe of the positioning outer pipe, a receiving cavity is formed in the lower end of the rod body of the telescopic inner rod, and a pull rope is connected between the limiting cavity of the positioning outer pipe and the receiving cavity of the telescopic inner rod.

[0012] As a further scheme of the utility model: the control driving assembly comprises a triangular outer shell and a driving motor, the motor body of the driving motor is fixedly connected into the triangular outer shell, the triangular outer shell is fixedly connected to the top end of the prismatic inner rod, a worm wheel is fixedly connected to one end of the rotating rod inserted into the triangular outer shell in a coaxial manner, a worm is fixedly connected to the motor shaft of the driving motor in a coaxial manner, and the worm wheel is meshingly connected with the worm.

[0013] As a further scheme of the utility model: a control terminal and a storage battery are further arranged in the triangular outer shell, a solar panel is embedded in the top shell body of the triangular outer shell, the control terminal is signal-connected with each electrical element, the storage battery is electrically connected with each electrical element, the laser phase method distance measuring sensor is installed on the bottom end shell body of the triangular outer shell in an inclination of 15°, and the distance measuring end of the laser phase method distance measuring sensor points to the flood control river water surface.

[0014] As a further scheme of the utility model: the outer edge of the annular buoyant plate is arranged in an upward inclination.

[0015] As a further scheme of the utility model: the board body of the stabilizing plate is provided with three groups of uniformly distributed sharp-cornered water distribution bases, the board body of the stabilizing plate between two adjacent sharp-cornered water distribution bases is provided with an inclined arc surface, and each sharp-cornered water distribution base is inlaid with a pressure sensor.

[0016] The utility model discloses the beneficial effect is:

[0017] 1、 telescopic rod assembly, protective net assembly and measuring assembly, the protective net assembly is covered in the outer side of telescopic rod assembly, the measuring assembly includes pressure sensor and laser phase method ranging sensor, the top of telescopic rod assembly is connected with control drive assembly on the liquid surface, the pressure sensor is arranged on the rod body of telescopic rod assembly below the liquid surface, and the laser phase method ranging sensor is installed in control drive assembly, and the protective net assembly is covered in the outer side of telescopic rod assembly and can effectively block the entanglement and impact of the floating object, weeds and the like in water to measuring equipment, the measuring assembly adopts the double configuration of pressure sensor and laser phase method ranging sensor, forms double measurement, and the pressure sensor is contact type measurement, and the laser phase method ranging sensor is non-contact type measurement, and the both complement each other to ensure that accurate and reliable water level data can be obtained under different water quality, weather conditions;

[0018] 2、 telescopic rod assembly includes prism inner rod and prism outer rod, and the prism inner rod is movably inserted in the prism outer rod, a plurality of layered horizontal stabilizing plates are fixedly connected on the rod body of the prism outer rod, the pressure sensor is fixedly connected on the stabilizing plate, and the prism inner rod is movably inserted in the prism outer rod to realize flexible adjustment of the height of the equipment to adapt to different water level conditions, the plurality of layered horizontal stabilizing plates fixedly connected on the rod body of the prism outer rod significantly increase the stability of the equipment in water, effectively suppress the swing caused by water flow, and the pressure sensor is fixedly connected on the stabilizing plate to ensure the stability of the installation of the sensor;

[0019] 3、 protective net assembly includes cylinder inner net and cylinder outer net, the upper end of the cylinder inner net is connected with annular buoyancy plate, and the annular buoyancy plate always floats on the water surface, adopts the double-layer movable sleeve structure of the cylinder inner net and the cylinder outer net, the cylinder inner net is movably sleeved in the cylinder outer net, so that the protective structure can adapt to water level change, the annular buoyancy plate connected to the upper end of the cylinder inner net always floats on the water surface, can automatically adjust the coverage range of the protective net assembly along with water level, and continuously provides the protection function. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is whole structure schematic view of the utility model;

[0021] Figure 2 It is telescopic rod assembly structure schematic view of the utility model;

[0022] Figure 3 It is the schematic view of the connection structure of the prismatic inner rod and the prismatic outer rod of the utility model;

[0023] Figure 4 It is the schematic view of the stable plate structure of the utility model;

[0024] Figure 5 It is the schematic view of the sectional structure of the telescopic rod assembly and the control driving assembly of the utility model;

[0025] Figure 6 It is the schematic view of the protective net assembly structure of the utility model;

[0026] Figure 7 It is the schematic view of the connection structure of the inner net and the outer net of the cylinder of the utility model;

[0027] Figure 8 It is the schematic view of the sectional structure of the annular buoyancy plate, the inner net and the outer net of the cylinder of the utility model;

[0028] Figure 9 It is the schematic view of the sectional structure of the positioning outer pipe and the telescopic inner rod of the utility model.

[0029] In the drawing: 1, telescopic rod assembly; 11, prismatic inner rod; 12, prismatic outer rod; 13, rotating rod; 14, bearing; 15, threaded rod; 16, movable cavity; 17, threaded cavity; 2, protective net assembly; 21, inner net of cylinder; 22, outer net of cylinder; 23, positioning outer pipe; 24, telescopic inner rod; 25, storage cavity; 26, limiting cavity; 27, pull rope; 3, control driving assembly; 31, three-ribbed shell; 32, control terminal; 33, worm gear; 34, worm; 35, driving motor; 36, battery; 37, solar panel; 4, annular buoyancy plate; 5, stable plate; 51, inclined camber surface; 52, sharp corner water distribution base; 6, stone pier base; 7, pressure sensor; 8, laser phase method ranging sensor. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] Embodiment one

[0032] As Figures 1 to 9As shown, a flood-prevention river water level measuring device, including a telescopic rod assembly 1, a protective net assembly 2 and a measuring assembly, the protective net assembly 2 is covered outside the telescopic rod assembly 1, the measuring assembly includes a pressure sensor 7 and a laser phase method ranging sensor 8, the top end of the telescopic rod assembly 1 located on the liquid surface is connected with a control driving assembly 3, the pressure sensor 7 is arranged on the rod body of the telescopic rod assembly 1 located below the liquid surface, the laser phase method ranging sensor 8 is installed in the control driving assembly 3, the protective net assembly 2 is covered outside the telescopic rod assembly 1, which can effectively block the entanglement and impact of floating objects, weeds and the like in the water on the measuring device, the measuring assembly adopts the double configuration of the pressure sensor 7 and the laser phase method ranging sensor 8, forming double measurement, the pressure sensor 7 is a contact type measurement, the laser phase method ranging sensor 8 is a non-contact type measurement, both of which are complementary to ensure that accurate and reliable water level data can be obtained under different water quality and weather conditions;

[0033] The telescopic rod assembly 1 includes a prismatic inner rod 11 and a prismatic outer rod 12, the prismatic inner rod 11 is movably inserted into the prismatic outer rod 12, a plurality of layered and horizontally arranged stabilizing plates 5 are fixedly connected to the rod body of the prismatic outer rod 12, the pressure sensor 7 is fixedly connected to the stabilizing plate 5, the prismatic inner rod 11 movably inserted into the prismatic outer rod 12 realizes flexible adjustment of the height of the device to adapt to different water level conditions, the plurality of layered and horizontally arranged stabilizing plates 5 fixedly connected to the rod body of the prismatic outer rod 12 significantly increase the stability of the device in water, effectively suppressing the swing caused by water flow, the pressure sensor 7 is fixedly connected to the stabilizing plate 5, ensuring the stability of the sensor installation;

[0034] The protective net assembly 2 includes a cylindrical inner net 21 and a cylindrical outer net 22, the cylindrical inner net 21 is movably sleeved in the cylindrical outer net 22, the upper end of the cylindrical inner net 21 is connected with a ring-shaped buoyancy plate 4, and the ring-shaped buoyancy plate 4 always floats on the water surface, the double-layer movable sleeving structure of the cylindrical inner net 21 and the cylindrical outer net 22 is adopted, the cylindrical inner net 21 is movably sleeved in the cylindrical outer net 22, so that the protective structure can adapt to the change of water level. The ring-shaped buoyancy plate 4 connected to the upper end of the cylindrical inner net 21 always floats on the water surface, which can automatically adjust the coverage range of the protective net assembly with the change of water level, and continuously provide the protection function.

[0035] Embodiment two

[0036] On the basis of embodiment one, improvements are made:

[0037] As Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the prism inner rod 11 and the prism outer rod 12 are both in a triangular prism structure, and the bottom end of the prism outer rod 12 is fixedly connected with a pier base 6 which is sunk into the bottom of the river channel. The edges of the triangular prism structure can effectively divide the water flow and reduce vortex-induced vibration of the equipment under the impact of the water flow, thereby enhancing the overall stability. The pier base 6 provides a solid and reliable foundation anchoring for the entire equipment, which can effectively resist the impact force of the water flow and the impact force of the floating objects, prevent the equipment from tilting, displacement or being washed away, and is particularly suitable for harsh environments with turbulent water flow during the flood season, providing a stable platform for water level measurement and thereby ensuring the accuracy and continuity of the measurement data.

[0038] Further, the inner rod of the prism inner rod 11 is movably connected with a rotating rod 13, and the rotating rod 13 is connected with the prism inner rod 11 through a bearing 14. The prism outer rod 12 is provided with a movable cavity 16 and a threaded cavity 17 in the inner rod, and the threaded cavity 17 is located below the movable cavity 16. The bottom end of the rotating rod 13 is coaxially fixedly connected with a threaded rod 15, the prism inner rod 11 is movably inserted into the movable cavity 16, and the rod body of the threaded rod 15 is screw-connected in the threaded cavity 17. When the rotating rod 13 rotates, the rotational motion is converted into linear motion through the screw connection between the threaded rod 15 and the threaded cavity 17, thereby driving the prism inner rod 11 to extend or retract relative to the prism outer rod 12, and realizing accurate and stable adjustment of the height of the equipment.

[0039] As shown in Figure 1 , Figures 6 to 9 , the outer side of the cylindrical outer net 22 is fixedly connected with a plurality of positioning outer pipes 23 uniformly distributed along the circumference, and the telescopic inner rod 24 is movably inserted into the positioning outer pipe 23. The upper end of the telescopic inner rod 24 is fixedly connected to the lower plate surface of the annular buoyancy plate 4. The floating of the annular buoyancy plate 4 can be stably transmitted to the cylindrical inner net 21 through the sliding of the telescopic inner rod 24 in the positioning outer pipe 23, and the circumferentially uniform positioning outer pipes 23 ensure that the cylindrical inner net 21 always maintains a vertical posture during the water level rising and falling process, preventing tilting or jamming, so that the protective net assembly 2 can smoothly adapt to changes in water level, while ensuring that the buoyancy of the annular buoyancy plate 4 is uniformly distributed to the upper end of the cylindrical inner net 21, ensuring the coordination and stability of the overall movement of the protective net assembly 2, so that it can effectively expand or contract its protection range with the water level fluctuation, continuously block floating objects of different water depths, and enhance the long-term reliability and protection effect of the equipment in dynamic water level environment.

[0040] Further, the positioning outer tube 23 is provided with a limiting cavity 26 in the tube, and the lower end of the telescopic inner rod 24 is provided with a receiving cavity 25, and the limiting cavity 26 of the positioning outer tube 23 and the receiving cavity 25 of the telescopic inner rod 24 are connected by a pull rope 27. When the water level rises, the annular buoyant plate 4 drives the telescopic inner rod 24 to move upward relative to the positioning outer tube 23, and the pull rope 27 is gradually straightened. When the telescopic inner rod 24 moves to the limit position, the pull rope 27 is completely taut, thereby preventing the telescopic inner rod 24 from being completely separated from the positioning outer tube 23 due to high water level or accidental conditions, thereby avoiding the separation of the inner cylinder net 21 and the outer cylinder net 22 and the loss of the annular buoyant plate 4.

[0041] As shown in Figure 1 , Figure 2 and Figure 5 , the control driving assembly 3 includes a triangular shell 31 and a driving motor 35, the body of the driving motor 35 is fixedly connected in the triangular shell 31, the triangular shell 31 is fixedly connected to the top end of the prismatic inner rod 11, one end of the rotating rod 13 inserted in the triangular shell 31 is fixedly connected with a worm wheel 33 in coaxial line, the motor shaft of the driving motor 35 is fixedly connected with a worm 34 in coaxial line, the worm wheel 33 is meshingly connected with the worm 34, and the meshing connection between the worm wheel 33 and the worm 34 constitutes a worm and gear transmission mechanism. When the driving motor 35 is started, the worm 34 is driven to rotate, the worm 34 drives the worm wheel 33 meshingly connected therewith to rotate, the worm wheel 33 in turn drives the rotating rod 13 to rotate, and finally the cooperation of the threaded rod 15 and the threaded cavity 17 realizes the lifting of the prismatic inner rod 11. The worm and gear mechanism has a reverse self-locking characteristic, that is, the worm 34 can drive the worm wheel 33, but the worm wheel 33 cannot reversely drive the worm 34, so that the height of the telescopic rod assembly 1 can be reliably locked when the driving motor 35 is not working, and the height will not be changed due to external force or self weight.

[0042] Further, the three-pronged shell 31 is also provided with a control terminal 32 and a battery 36, the top shell body of the three-pronged shell 31 is embedded with a solar panel 37, the control terminal 32 is signal connected with each electrical element, the battery 36 is electrically connected with each electrical element, the laser phase method ranging sensor 8 is installed in a 15° inclined manner on the bottom end shell body of the three-pronged shell 31, and the ranging end of the laser phase method ranging sensor 8 points to the flood control river water surface, the control terminal 32 is responsible for processing the data of the pressure sensor 7 and the laser phase method ranging sensor 8, controlling the operation of the driving motor 35, and the battery 36 provides continuous power supply for the entire device, the solar panel 37 embedded in the top shell body of the three-pronged shell 31 can convert solar energy into electrical energy to charge the battery 36, forming a self-sufficient green energy system, especially suitable for long-term work in the field of river environment lacking of power supply; the laser phase method ranging sensor 8 adopts an inclined installation manner, which can effectively avoid the problem of signal loss caused by mirror reflection when the laser beam is vertically incident on the water surface, improve the success rate and accuracy of non-contact measurement, it should be noted that the control terminal 32 can adopt the control terminal in the water conservancy engineering intelligent water level monitor disclosed in the public number CN212007454U, and the laser ranging unit in the water level calibration device and the water level calibration device array disclosed in the public number CN209605912U.

[0043] As shown in Figure 2 and Figure 8 , the outer edge of the annular buoyancy plate 4 is arranged in an upward inclined manner, and the outer edge of the annular buoyancy plate 4 is designed in a streamline shape, so that the floating debris, branches and the like in the water are more easily guided below the plate surface or on both sides and pass through, rather than directly impacting or accumulating on the side and above the annular buoyancy plate 4, effectively reducing the risk of debris loading and entanglement, and maintaining the buoyancy efficiency and action flexibility of the annular buoyancy plate 4.

[0044] As shown in Figure 2 and Figure 4As shown, the plate body of the stabilizing plate 5 is provided with three groups of uniformly distributed sharp corner water distribution bases 52, and the plate body of the stabilizing plate 5 located between two adjacent sharp corner water distribution bases 52 is provided with an inclined arc surface 51, each sharp corner water distribution base 52 is embedded with a pressure sensor 7, and the triangular or wedge-shaped sharp corners of the sharp corner water distribution bases 52 can effectively divide the water flow like a bow when facing the water flow impact, guide the water flow to smoothly transition to both sides, thereby greatly reducing the fluid resistance borne by the stabilizing plate 5, and the inclined arc surface 51 and the sharp corner water distribution base 52 together form a streamlined whole, further optimizing the flow field when the water flow passes through the plate body, avoiding large vortex and pressure difference resistance, which helps the equipment to maintain stability in the flowing water, and the pressure sensor 7 is placed in the area after the water flow is stably divided, which reduces the measurement noise and dynamic pressure interference that may be brought by the direct impact of the water flow on the sensor sensing surface, provides a relatively stable measurement environment for the pressure sensor 7, and is beneficial to improve the accuracy of water level measurement. It should be noted that the model of the pressure sensor 7 is IOT-S500SWL.

[0045] Working principle: the device is stably placed at the bottom of the river channel through the stone pier base 6, and the telescopic rod assembly 1 as the core support structure penetrates up and down through the water surface, when the measurement height needs to be adjusted, the driving motor 35 in the control driving assembly 3 is started to drive the worm 34 to rotate, the worm wheel 33 connected with the rotating rod 13 is driven to convert the rotary motion into the linear lifting motion of the prismatic inner rod 11, and the reverse self-locking characteristic of the worm and gear mechanism ensures that the height after adjustment is locked;

[0046] The measurement system adopts a double-sensing mechanism, a plurality of pressure sensors 7 located underwater directly sense water pressure changes, and a laser phase method ranging sensor 8 located above the water surface in the control driving assembly 3 calculates the distance through the phase difference, and the data of the two sensors is complementary;

[0047] The protective net assembly 2 provides all-around protection through the double-layer movable sleeve structure of the cylindrical outer net 22 and the cylindrical inner net 21, the annular buoyancy plate 4 always floats on the water surface and drives the cylindrical inner net 21 to rise and fall synchronously with the water level, and the pull rope 27 is connected between the limiting cavity 26 of the positioning outer pipe 23 and the storage cavity 25 of the telescopic inner rod 24, and is taut at the limit position to prevent the assembly from separating.

[0048] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0049] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A flood-prevention river water level measuring device, comprising a telescopic rod assembly (1), a protective net assembly (2) and a measuring assembly, characterized in that: The protection net assembly (2) is covered outside the telescopic rod assembly (1), the measuring assembly comprises a pressure sensor (7) and a laser phase method ranging sensor (8), the telescopic rod assembly (1) is connected with the control driving assembly (3) at the top end on the liquid surface, the pressure sensor (7) is arranged on the rod body of the telescopic rod assembly (1) under the liquid surface, and the laser phase method ranging sensor (8) is installed in the control driving assembly (3). The telescopic rod assembly (1) comprises a prism inner rod (11) and a prism outer rod (12), the prism inner rod (11) is movably inserted in the prism outer rod (12), a plurality of stable plates (5) are horizontally arranged in layers and are fixedly connected to the rod body of the prism outer rod (12), and the pressure sensor (7) is fixedly connected to the stable plate (5). The protection net assembly (2) comprises a cylindrical inner net (21) and a cylindrical outer net (22), the cylindrical inner net (21) is movably sleeved in the cylindrical outer net (22), and the upper end of the cylindrical inner net (21) is connected with the annular buoyancy plate (4), and the annular buoyancy plate (4) always floats on the water surface.

2. The flood prevention riverway water level measuring apparatus according to claim 1, characterized by: The prism inner rod (11) and the prism outer rod (12) both adopt a triangular prism structure, and the bottom end of the prism outer rod (12) is fixedly connected with a stone pier base (6), and the stone pier base (6) is sunk into the bottom of the river channel.

3. The flood control river water level measuring device according to claim 2, characterized in that: The inner rod of the prism inner rod (11) movably penetrates and connects with a rotating rod (13), a bearing (14) is connected between the rotating rod (13) and the prism inner rod (11), an active cavity (16) and a threaded cavity (17) are formed in the inner rod of the prism outer rod (12), the threaded cavity (17) is located below the active cavity (16), the bottom end of the rotating rod (13) is fixedly connected with a threaded rod (15) in the same axis, the prism inner rod (11) is movably inserted in the active cavity (16), and the rod body of the threaded rod (15) is screw-connected in the threaded cavity (17).

4. The flood prevention riverway water level measuring apparatus according to claim 1, characterized by: A plurality of positioning outer pipes (23) are fixedly connected to the outer net body of the cylindrical outer net (22) and are uniformly distributed along the circumference, the telescopic inner rod (24) is movably inserted in the positioning outer pipe (23), and the upper end of the telescopic inner rod (24) is fixedly connected to the lower plate surface of the annular buoyancy plate (4).

5. The flood control river water level measuring device according to claim 4, characterized in that: A limiting cavity (26) is formed in the inner pipe of the positioning outer pipe (23), a receiving cavity (25) is formed in the lower end of the telescopic inner rod (24), and a pull rope (27) is connected between the limiting cavity (26) of the positioning outer pipe (23) and the receiving cavity (25) of the telescopic inner rod (24).

6. The flood control river water level measuring device according to claim 3, characterized in that: The control driving assembly (3) comprises a triangular outer shell (31) and a driving motor (35), the machine body of the driving motor (35) is fixedly connected in the triangular outer shell (31), the triangular outer shell (31) is fixedly connected to the top end of the prism inner rod (11), one end of the rotating rod (13) inserted in the triangular outer shell (31) is fixedly connected with a worm wheel (33) in the same axis, the motor shaft of the driving motor (35) is fixedly connected with a worm (34) in the same axis, and the worm wheel (33) is meshingly connected with the worm (34).

7. The flood control river water level measuring device according to claim 6, characterized in that: The three-prism-shaped shell (31) is internally provided with a control terminal (32) and a storage battery (36), the top shell body of the three-prism-shaped shell (31) is internally embedded with a solar panel (37), the control terminal (32) is signal-connected with each electrical element, the storage battery (36) is electrically connected with each electrical element, the laser phase method ranging sensor (8) is installed on the bottom end shell body of the three-prism-shaped shell (31) in a 15° inclination, and the ranging end of the laser phase method ranging sensor (8) points to the flood control river water surface. 8.The flood prevention riverway water level measuring device according to claim 1, characterized in that: The outer edge of the annular buoyancy plate (4) is arranged in a downward inclination.

9. The flood prevention riverway water level measuring apparatus according to claim 1, characterized by: The plate body of the stabilizing plate (5) is provided with three groups of uniformly distributed sharp-cornered water distribution bases (52), the plate body of the stabilizing plate (5) between two adjacent sharp-cornered water distribution bases (52) is provided with an inclined camber (51), and each sharp-cornered water distribution base (52) is internally embedded with a pressure sensor (7).

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