River flow monitoring system

Abstract

The invention relates to the technical field of river flow monitoring, in particular to a river flow monitoring system which comprises a supporting frame, a sliding frame, a driving motor, a transmission part and a plurality of monitoring units, the supporting frame is fixedly arranged, the sliding frame is slidably mounted on the supporting frame, and the driving motor drives the sliding frame to slide up and down along the supporting frame through the transmission part; a plurality of monitoring units are sequentially arranged at intervals in the width direction of the river surface, each monitoring unit is composed of a communicating pipe, a floating ball, a first conductive rod, a first conductive sleeve, an ampere meter and the like, and the system is further provided with a lifting control circuit and a liquid level regulation and control circuit. The flow velocity near the water surface and the water depth are converted into current signals capable of being monitored in real time, indirect and real-time monitoring of the river channel flow is achieved, the problems that manual operation is low in efficiency and precision is interfered are solved, and the river channel flow monitoring device has the advantages that automatic and efficient monitoring of the river channel flow is achieved, the measuring precision and efficiency are improved, and manual dependence and environmental interference are reduced.

Description

Technical Field

[0001] This invention relates to the field of river flow monitoring technology, and in particular to a river flow monitoring system. Background Technology

[0002] River flow is a fundamental hydraulic parameter for river hydrological monitoring. Accurate monitoring of the spatiotemporal changes in river flow plays a crucial role in water-related decision-making, including water resource management, flood control and disaster reduction, water conservancy project design, and ecological protection. For example: (1) By accurately monitoring river flow, the allocation and utilization of water resources can be rationally planned to ensure that water resources can meet the needs of industrial and agricultural production and residents' lives; (2) Real-time understanding of changes in river flow can help predict possible flood disasters in advance, giving relevant departments valuable time to take flood control measures and thus reducing the losses caused by floods; (3) Real-time understanding of changes in river flow helps engineers better understand the hydrodynamic characteristics of rivers, optimize the design of water conservancy projects, and improve the efficiency and safety of projects; (4) Monitoring flow changes helps assess the health status of ecosystems, protect the water ecological balance, and create favorable conditions for the maintenance of biodiversity.

[0003] Traditional methods for measuring river flow mainly include three types: the current meter method, the buoy method, and the weir-channel method. The current meter method involves purchasing a current meter and relying on manual on-site measurement. This method has significant drawbacks: high manpower and material investment, low measurement efficiency, high risk, and untimely data acquisition. The buoy method involves deploying buoys on the river surface, calculating the vertical average velocity by measuring the buoy's drift speed, and then combining this with the cross-sectional area to calculate the flow rate. However, the results are easily affected by external factors such as wind and ship waves, making it difficult to meet the requirements for high-precision monitoring. The weir-channel method involves constructing weir or channel structures in the area to be measured in the channel, establishing a stable single-value relationship between the upstream water level and the flow rate, and finally converting the flow rate through water level measurement. This method requires local modifications to the channel structure, significantly increasing engineering costs, and is often only suitable for artificial ditches and small rivers. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a river flow monitoring system. Based on the innovative coupling of electrical and fluid mechanics principles, it converts near-surface flow velocity and water depth into real-time monitorable current signals, thereby achieving indirect and real-time monitoring of river flow.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A river flow monitoring system includes a support frame, a sliding frame, a drive motor, a transmission component, and multiple monitoring units; wherein

[0007] The support frame is fixedly installed;

[0008] The sliding frame is slidably mounted on the support frame;

[0009] The drive motor is fixedly mounted on the support frame, and the drive motor is connected to the sliding frame through a transmission component to drive the sliding frame to slide up and down along the support frame.

[0010] Multiple monitoring units are arranged at intervals along the width of the river. Each monitoring unit includes a connecting pipe, a float, a first conductive rod, a first conductive sleeve, and an ammeter. The connecting pipe, the first conductive sleeve, and the ammeter are all fixedly mounted on a sliding frame. One opening of the connecting pipe faces upward, while the other opening is operably inserted below the river surface. The float is movably disposed in the connecting pipe, and the first conductive sleeve is located above one opening of the connecting pipe. One end of the first conductive rod is fixedly connected to the float, and the other end is slidably disposed within the first conductive sleeve. The first conductive rod, the first conductive sleeve, and the ammeter are sequentially electrically connected to an external power source.

[0011] Connecting pipes include straight pipes and bends.

[0012] Optionally, multiple monitoring units can be set up sequentially at equal intervals.

[0013] Optionally, the transmission components include a rope drum and a rope. The rope drum is coaxially connected to the shaft of the drive motor, one end of the rope is fixedly connected to the rope drum, and the other end of the rope is fixedly connected to the sliding frame.

[0014] Optionally, the support frame is gantry-shaped, and the two ends of the sliding frame are slidably fitted onto the two support rods of the support frame, with pulleys provided between the ends of the sliding frame and the support rods.

[0015] Optionally, the river flow monitoring system also includes a lifting control circuit, which is electrically connected to the drive motor to adjust the position of the monitoring unit. The control circuit includes a single-pole double-throw switch, a first electromagnet, a second electromagnet, a first protective resistor, a second protective resistor, a first spring switch, a second spring switch, a third spring switch, a fourth spring switch, a first master control switch, and a first power supply.

[0016] The first power supply, the first stationary contact of the single-pole double-throw switch, the first electromagnet, the first spring switch, the first electrode of the drive motor, the second electrode of the drive motor, the second spring switch, the fourth spring switch, the second protective resistor are connected in series and the first main control switch is connected in series.

[0017] The first power supply, the second stationary contact of the single-pole double-throw switch, the second electromagnet, the second spring switch, the second electrode of the drive motor, the first electrode of the drive motor, the first spring switch, the third spring switch, the first protective resistor, and the first master control switch are connected in series.

[0018] The first electromagnet is positioned opposite the third spring switch; the second electromagnet is positioned opposite the fourth spring switch.

[0019] Optionally, the sliding frame is provided with an upper insulating rod and a lower insulating rod from top to bottom at its end. The upper insulating rod is positioned opposite the second spring switch, and the lower insulating rod is positioned opposite the first spring switch. When the sliding frame moves upward, the upper insulating rod can operably abut against and disconnect the second spring switch. When the sliding frame moves downward, the lower insulating rod can operably abut against and disconnect the first spring switch.

[0020] Optionally, the river flow monitoring system also includes a liquid level control circuit, which includes a second power supply, a second main control switch, a third main control switch, a liquid level height switch, a third electromagnet, a fourth electromagnet, a third protective resistor, a fourth protective resistor, a fifth spring switch, and a sixth spring switch.

[0021] The liquid level switch includes a fixed tube, a float, a second conductive rod, and a second conductive sleeve. The fixed tube is fixedly installed on the sliding frame, the float is slidably disposed inside the fixed tube, the second conductive sleeve is fixedly installed on the fixed tube, the middle part of the second conductive rod is insulated, one end of the second conductive rod is fixedly installed on the float, and the other end of the second conductive rod is slidably disposed inside the second conductive sleeve.

[0022] The second power supply, the second master switch, the second conductive sleeve, the lower section of the second conductive rod, the third electromagnet, the second electrode of the drive motor, the first electrode of the drive motor, the sixth spring switch, the fourth protective resistor, and the third master switch are connected in series.

[0023] The second power supply, the second master switch, the second conductive sleeve, the upper section of the second conductive rod, the fourth electromagnet, the first electrode of the drive motor, the second electrode of the drive motor, the fifth spring switch, the third protective resistor, and the third master switch are connected in series.

[0024] Optionally, a second spring switch is connected in series between the third electromagnet and the second electrode of the drive motor; a first spring switch is connected in series between the fourth electromagnet and the first electrode of the drive motor.

[0025] Compared with existing technologies, the river flow monitoring system provided by this invention, through the synergistic action of a support frame, sliding frame, drive motor, transmission components and multiple monitoring units, and based on the innovative coupling of electrical and fluid mechanics principles, converts the near-surface flow velocity and water depth into a real-time monitorable current signal, ultimately realizing indirect and real-time monitoring of river flow. This solves the problems of low efficiency and accuracy interference of manual operation in existing technologies, and has the advantages of realizing automated and efficient monitoring of river flow, improving measurement accuracy and efficiency, and reducing reliance on manual labor and environmental interference. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the river flow monitoring system in an embodiment of the present invention;

[0028] Figure 2 This is a top view of the river flow monitoring system in an embodiment of the present invention.

[0029] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0030] Figure 4 This is a schematic diagram of the liquid level switch in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the overall circuit structure of the lifting control circuit and the liquid level regulation circuit in an embodiment of the present invention.

[0032] In the diagram: 1. Support frame; 2. Sliding frame; 3. Drive motor; 4. Transmission component; 5. Monitoring unit; 6. Connecting pipe; 7. Float; 8. First conductive rod; 9. First conductive sleeve; 10. Ammeter; 11. Rope winding drum; 12. Rope; 13. Single-pole double-throw switch; 14. First electromagnet; 15. Second electromagnet; 16. First protective resistor; 17. Second protective resistor; 18. First spring switch; 19. Second spring switch; 20. Third spring switch; 21. Fourth spring switch; 22. First master switch; 23. First power supply; 24. Second master switch; 25. Third master switch; 26. Liquid level switch; 27. Third electromagnet; 28. Fourth electromagnet; 29. ​​Third protective resistor; 30. Fourth protective resistor; 31. Fifth spring switch; 32. Sixth spring switch; 33. Fixed pipe; 34. Float; 35. Second conductive rod; 36. Second conductive sleeve. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] Traditional methods for monitoring river flow, such as current meter methods, buoy methods, and weir-channel methods, have many limitations in practical applications. Current meter methods involve large investments, low efficiency, high risks, and untimely data acquisition; buoy methods are susceptible to interference from external factors such as wind and ship waves, making them unsuitable for high-precision monitoring; and weir-channel methods require localized modifications to the river channel structure, resulting in high engineering costs and limited applicability. These shortcomings make it difficult for traditional methods to achieve accurate, real-time, and efficient monitoring of river flow.

[0035] To address the aforementioned problems, this application provides a river flow monitoring system. The system includes a support frame 1, a sliding frame 2, a drive motor 3, a transmission component 4, and multiple monitoring units 5. The support frame 1 is fixedly installed, and the sliding frame 2 is slidably mounted on the support frame 1. The drive motor 3 is fixedly mounted on the support frame 1 and connected to the sliding frame 2 via the transmission component 4, driving the sliding frame 2 to slide up and down along the support frame 1. Multiple monitoring units 5 are arranged sequentially at intervals along the width of the river surface. Each monitoring unit 5 includes a connecting pipe 6, a float 7, a first conductive rod 8, a first conductive sleeve 9, and an ammeter 10. The connecting pipe 6, the first conductive sleeve 9, and the ammeter 10 are all fixedly mounted on the sliding frame 2. One opening of the connecting pipe 6 faces upwards, while the other opening is operably inserted below the river surface. The float 7 is movably disposed within the connecting pipe 6, and the first conductive sleeve 9 is located above one opening of the connecting pipe 6. One end of the first conductive rod 8 is fixedly connected to the float 7, and the other end is slidably disposed within the first conductive sleeve 9. The first conductive rod 8, the first conductive sleeve 9, and the ammeter 10 are sequentially electrically connected to an external power source. The structure of the connecting pipe 6 includes a straight pipe and a bent pipe.

[0036] For ease of understanding, the following explains some key terms in this embodiment:

[0037] Support frame 1 is set as the main load-bearing structure of the system, and its function is to provide a stable installation foundation for the entire monitoring system. Support frame 1 is usually fixed to the riverbank or river structure to ensure that the system remains in place under the impact of water flow or other external forces.

[0038] The sliding frame 2 is designed to move up and down along the support frame 1. Its function is to support the monitoring unit 5 and, through the cooperation of the drive motor 3 and the transmission component 4, to adjust the position of the monitoring unit 5 in the vertical direction to adapt to different river water levels or monitoring depth requirements.

[0039] The drive motor 3 provides power to drive the sliding frame 2 to move up and down. This drive motor 3 is usually an electric motor, and its rotational output is converted into linear motion of the sliding frame 2 through the transmission component 4.

[0040] The transmission component 4 is used to convert the rotational motion of the drive motor 3 into the linear sliding motion of the sliding frame 2. The transmission component 4 can take various forms, such as gear and rack, lead screw and nut, or rope 12 winding mechanism, the selection of which depends on the required transmission efficiency, accuracy and load-bearing capacity.

[0041] Monitoring unit 5 is the core component used for actual measurement of river flow. Each monitoring unit 5 is configured to operate independently, outputting an electrical signal by sensing changes in water flow, thereby enabling the monitoring of local water flow conditions. The combined use of multiple monitoring units 5 is designed to cover a wider river surface area to obtain more comprehensive flow data.

[0042] The connecting pipe 6 is designed as a hollow tubular structure with one opening facing upwards and the other opening inserted below the river surface. The function of the connecting pipe 6 is to guide river water into its interior and provide a confined space for the float 7 to move up and down with changes in the water level inside the pipe.

[0043] The float 7 is placed inside the connecting pipe 6. Its density is less than that of water, so it can float on the water surface. The movement of the float 7 directly reflects the change in water level within the connecting pipe 6, and thus indirectly reflects the change in river flow velocity.

[0044] The first conductive rod 8 is fixedly connected to the float 7 and works in conjunction with the first conductive sleeve 9. The first conductive rod 8 moves as the float 7 rises and falls, and the change in its contact state or relative position with the first conductive sleeve 9 is used to change the conduction state or resistance value of the circuit.

[0045] The first conductive sleeve 9 is fixedly installed above the connecting pipe 6 and slides in engagement with the first conductive rod 8. The first conductive sleeve 9 and the first conductive rod 8 together constitute a variable resistor or switch, whose electrical characteristics change with the position of the float 7.

[0046] Ammeter 10 is used to measure the current in the circuit. In this system, ammeter 10 is electrically connected in the circuit consisting of first conductive rod 8 and first conductive sleeve 9, and indicates the position of float 7 by measuring the change in current, thereby indirectly reflecting the change in the velocity of the river flow.

[0047] This application provides a river flow monitoring system, the overall structure of which includes a support frame 1, a sliding frame 2, a drive motor 3, a transmission component 4, and multiple monitoring units 5. The support frame 1 is designed as the basic structure of the system, and its function is to provide a stable installation platform. The support frame 1 can be constructed in various forms, such as a single-column, frame, or truss structure, and is firmly fixed to the riverbank or bridge pier to resist the impact of water flow and wind.

[0048] The sliding frame 2 is mounted on the support frame 1 and configured to slide up and down along the support frame 1. The sliding frame 2 can be slidable by means of a guide rail slider structure, a sleeve sliding structure, or a roller guide structure to ensure its smooth movement in the vertical direction.

[0049] The drive motor 3 is fixedly mounted on the support frame 1, and its function is to provide power for the lifting and lowering of the sliding frame 2. The drive motor 3 can be a DC motor, an AC motor, or a stepper motor, and its output shaft is connected to the transmission component 4.

[0050] The transmission component 4 is used to convert the rotary motion of the drive motor 3 into the linear reciprocating motion of the sliding frame 2. This transmission component 4 can take the form of a gear and rack mechanism, a lead screw and nut mechanism, or a chain drive mechanism to achieve precise control of the position of the sliding frame 2. For example, a gear can mesh with a rack on the sliding frame 2, and the drive motor 3 can drive the gear to rotate, thereby driving the sliding frame 2 to move up and down.

[0051] Multiple monitoring units 5 are arranged at intervals along the width of the river. These monitoring units 5 can be arranged uniformly or non-uniformly, depending on the specific width of the river and the required monitoring accuracy. For example, more densely packed monitoring units 5 can be set in the central area of ​​the river, while they can be appropriately sparsed on both banks.

[0052] Each monitoring unit 5 is the core component of flow monitoring, and its internal components include a connecting pipe 6, a float 7, a first conductive rod 8, a first conductive sleeve 9, and an ammeter 10. These components are configured in concert to sense changes in water level and convert them into electrical signals.

[0053] The connecting pipe 6, the first conductive sleeve 9, and the ammeter 10 are fixedly mounted on the sliding frame 2. This fixing method ensures that the monitoring unit 5 moves up and down synchronously with the sliding frame 2 as a whole, thereby allowing adjustment of its immersion depth in water.

[0054] The connecting pipe 6 is designed with one upward-facing opening and another opening that can be inserted below the river surface. The upward-facing opening can be an open port for communication with the atmosphere, while the other opening is designed to be submerged in the river water to guide the water into the connecting pipe 6. The upper part of the connecting pipe 6 can be designed as a straight pipe, with a bend at the bottom to facilitate the movement of the float 7 and the installation of the conductive rod.

[0055] A float 7 is movably mounted inside the connecting pipe 6. The float 7 is typically made of a lightweight material, such as plastic or foam, and its size is designed to allow it to move freely up and down within the connecting pipe 6 and to float according to changes in the water level inside the pipe.

[0056] The first conductive sleeve 9 is positioned above one opening of the connecting pipe 6. The first conductive sleeve 9 may be a metal ring or a section of metal pipe, with an inner diameter slightly larger than the outer diameter of the first conductive rod 8 to allow the first conductive rod 8 to slide inside it.

[0057] One end of the first conductive rod 8 is fixedly connected to the float 7, while the other end is slidably disposed inside the first conductive sleeve 9. The first conductive rod 8 can be a metal rod with good conductivity, and its length is designed to cover the entire range of motion of the float 7 within the connecting pipe 6, and to always maintain electrical contact with the first conductive sleeve 9.

[0058] The first conductive rod 8, the first conductive sleeve 9, and the ammeter 10 are sequentially electrically connected to an external power source. This connection method constitutes a simple circuit. When the float 7 moves with the water level, the sliding of the first conductive rod 8 within the first conductive sleeve 9 changes the resistance value of the circuit, thereby causing a change in the current indicated by the ammeter 10. By measuring the change in current, the position of the float 7 can be indirectly calculated, and thus the water level information can be obtained.

[0059] The structure of the connecting pipe 6 includes a straight pipe and a bend. For example, the lower part of the connecting pipe 6 can be a vertical straight pipe to guide the water flow and accommodate the float 7, while the upper part is connected to the first conductive sleeve 9 through a bend to provide a smooth transition area and facilitate the installation and sliding of the first conductive rod 8.

[0060] This river flow monitoring system uses a liftable sliding frame 2 to mount multiple monitoring units 5, enabling the monitoring of river surface velocity at different water levels. Each monitoring unit 5 utilizes a float 7, a conductive rod, and a conductive sleeve to convert the kinetic energy of the water flow into water level changes, which are then converted into electrical signals and indicated by an ammeter 10. This design overcomes the limitations of traditional methods in terms of manpower, measurement efficiency, accuracy, and river channel modification, providing more accurate, real-time, and wider-coverage flow data, thereby effectively supporting water-related decision-making in water resource management, flood control and disaster reduction, and ecological protection.

[0061] In some of the embodiments described above in this application, multiple monitoring units 5 are arranged sequentially at intervals along the width of the river surface to monitor river flow. However, in the implementation process, if the intervals of the monitoring units 5 are not uniform, it may lead to insufficient representativeness of the data collection and affect the accuracy and reliability of flow measurement.

[0062] To address this, this application further proposes a series of monitoring units 5 arranged at equal intervals. Specifically, the arrangement of multiple monitoring units 5 at equal intervals means that the distance between each monitoring unit 5 arranged along the width of the river surface is equal. This arrangement aims to ensure uniform sampling across the entire width of the river surface. In practice, equal intervals can be achieved in various ways. For example, during installation, equally spaced installation points can be precisely measured and marked on the sliding frame 2 beforehand, and then each monitoring unit 5 can be fixed in these predetermined positions, ensuring that the center distance or edge distance between adjacent monitoring units 5 remains consistent. Furthermore, the sliding frame 2 itself can be designed with equally spaced installation structures, such as pre-set mounting holes, slots, or guide rails, so that the monitoring units 5 can be easily and accurately installed. A modular design can also be adopted, where each monitoring unit 5 has a standardized width and is connected by spacers of fixed dimensions, thus naturally forming an equally spaced arrangement.

[0063] Through the above technical solution, multiple monitoring units 5 are arranged at equal intervals along the width of the river, ensuring the uniformity and representativeness of data collection across the entire river width. This helps eliminate measurement errors that may be caused by uneven sampling, enabling the system to obtain more accurate and reliable river flow data, thereby improving the overall accuracy of flow monitoring and the effectiveness of data analysis.

[0064] In some embodiments described above in this application, the river flow monitoring system uses a drive motor 3 to drive a transmission component 4 connected to a sliding frame 2, thereby enabling the sliding frame 2 to slide up and down along the support frame 1, thus adjusting the position of the monitoring unit 5. However, in practical applications, the transmission component 4 has various structural forms. If an inappropriate selection is made, it may lead to low transmission efficiency, unstable movement, or insufficient control precision, thereby affecting the reliability and accuracy of the position adjustment of the monitoring unit 5.

[0065] In this regard, this application further proposes a specific implementation of the transmission component 4, which includes a rope winding drum 11 and a rope 12. The rope winding drum 11 is coaxially connected to the shaft of the drive motor 3, one end of the rope 12 is fixedly connected to the rope winding drum 11, and the other end of the rope 12 is fixedly connected to the sliding frame 2.

[0066] Specifically, the transmission component 4 is the key component for realizing the power output of the drive motor 3 to the vertical movement of the sliding frame 2. Specifically defined as a combination of the rope drum 11 and the rope 12, it provides a direct and effective mechanical transmission method. The rope drum 11 is responsible for storing and releasing the rope 12, while the rope 12 acts as a flexible transmission medium, converting the rotational motion of the rope drum 11 into the linear reciprocating motion of the sliding frame 2. The rope drum 11 is coaxially connected to the shaft of the drive motor 3, meaning that the rotational torque of the drive motor 3 can be directly and efficiently transmitted to the rope drum 11, reducing energy loss and transmission errors in intermediate transmission links. This connection method ensures precise control of the rope drum 11 by the drive motor 3, thereby guaranteeing the smoothness and accuracy of the sliding frame 2's movement. Simultaneously, the fixed connection at both ends of the rope 12 is a necessary condition for reliable transmission. The rope 12 is fixedly connected to the rope drum 11, ensuring that the rope drum 11 can effectively wind or release the rope 12 when rotating; the other end of the rope 12 is fixedly connected to the sliding frame 2, ensuring that the extension and retraction of the rope 12 can directly drive the sliding frame 2 to move up and down. This fixed connection method avoids slippage or detachment during transmission, improving the reliability and safety of the system.

[0067] The above technical solution specifically defines the transmission component 4 as a combination of a rope drum 11 and a rope 12, with the rope drum 11 coaxially connected to the shaft of the drive motor 3. The two ends of the rope 12 are fixedly connected to the rope drum 11 and the sliding frame 2, respectively. This provides a simple, efficient, and easily controllable vertical lifting mechanism. The drive motor 3 directly drives the rope drum 11 to rotate via its shaft. The winding or unwinding of the rope 12 by the rope drum 11 precisely controls the up-and-down movement of the sliding frame 2. This transmission method effectively avoids the manufacturing difficulties and maintenance costs that complex gear or screw transmission mechanisms may bring. Furthermore, the flexibility of the rope 12 can absorb impacts to a certain extent, making the lifting process of the sliding frame 2 smoother. Therefore, this solution significantly improves the reliability, stability, and control accuracy of the position adjustment of the monitoring unit 5 in the river flow monitoring system.

[0068] In some embodiments described above in this application, the river flow monitoring system uses a support frame 1 and a sliding frame 2 to raise and lower the monitoring unit 5. However, in practical applications, the sliding fit between the support frame 1 and the sliding frame 2 may have insufficient stability, and may be prone to tilting or jamming, especially when the river environment is complex and the monitoring unit 5 is large in size, which may affect the accuracy of monitoring and the reliability of the system.

[0069] In response, this application further proposes a river flow monitoring system, wherein the support frame 1 is gantry-shaped, and the two ends of the sliding frame 2 are respectively slidably sleeved on the two support rods of the support frame 1, and pulleys are provided between the end of the sliding frame 2 and the support rods.

[0070] Specifically, the support frame 1 is designed as a gantry structure, typically consisting of two vertical support rods and a crossbeam connecting their tops. This gantry structure provides a more robust and stable foundation for the entire monitoring system, effectively resisting disturbances from the external environment (such as wind and water flow), ensuring the long-term stable operation of the system in the river. The support frame 1 can be made of high-strength metal materials (such as stainless steel or galvanized steel) or composite materials and is firmly fixed to the riverbank or riverbed.

[0071] The sliding frame 2 is slidably fitted onto the two support rods of the support frame 1 at both ends. This means that the sliding frame 2 is guided and supported simultaneously by two support rods in the vertical direction, rather than by a single support point. The sliding fitting structure can be achieved by setting sleeves or guide grooves at both ends of the sliding frame 2 that match the shape of the support rods, ensuring that the sliding frame 2 maintains a horizontal posture during lifting and lowering, and avoiding tilting or deflection due to uneven force. This dual-point support and guidance mechanism significantly improves the stability and accuracy of the sliding frame 2's movement.

[0072] To further optimize the lifting performance of the sliding frame 2, pulleys are provided between the ends of the sliding frame 2 and the support rod. These pulleys are typically installed inside or outside the sliding frame 2, contacting the surface of the support rod. The introduction of pulleys converts sliding friction into rolling friction, thereby significantly reducing the resistance when the sliding frame 2 moves on the support rod. The pulleys can be made of wear-resistant materials (such as polyurethane, nylon, or special alloys) and can be configured with bearings to ensure smooth rotation. By rationally arranging the pulleys, for example, by providing multiple pulleys at each end of the sliding frame 2 to provide multi-directional support and guidance, the stability and smoothness of the sliding frame 2 during lifting can be further ensured, and component wear can be reduced.

[0073] Through the above technical solution, the gantry-shaped support frame 1 provides the river flow monitoring system with higher structural stability and anti-overturning capability, effectively addressing the complexity of the river environment. The two ends of the sliding frame 2 are respectively slidably fitted onto the two support rods of the support frame 1, ensuring that the sliding frame 2 maintains a horizontal posture during lifting and lowering, avoiding tilting or jamming problems that may occur with single-point support. Furthermore, pulleys are installed between the ends of the sliding frame 2 and the support rods, significantly reducing sliding friction and ensuring the smoothness and stability of the lifting and lowering process of the sliding frame 2. This reduces the load on the drive motor 3 and the wear of components, thereby improving the operational reliability and service life of the entire river flow monitoring system and ensuring the accuracy of the monitoring data.

[0074] In some of the above embodiments, the river flow monitoring system drives the sliding frame 2 to slide up and down via the drive motor 3 and the transmission component 4, thereby adjusting the position of the monitoring unit 5. However, in actual operation, how to accurately and safely control the lifting and lowering movement of the sliding frame 2, avoid overshooting or misoperation, and ensure that the monitoring unit 5 can stably remain in the preset position is a technical problem that needs to be solved.

[0075] In response, this application further proposes a river flow monitoring system, which also includes a lifting control circuit electrically connected to a drive motor 3 to adjust the position of the monitoring unit 5. The control circuit includes a single-pole double-throw switch 13, a first electromagnet 14, a second electromagnet 15, a first protective resistor 16, a second protective resistor 17, a first spring switch 18, a second spring switch 19, a third spring switch 20, a fourth spring switch 21, a first master switch 22, and a first power supply 23. The first power supply 23, the first stationary contact of the single-pole double-throw switch 13, the first electromagnet 14, the first spring switch 18, the first electrode of the drive motor 3, the second electrode of the drive motor 3, the second spring switch 19, the second protective resistor 17, and the first master switch 22 are connected in series. Simultaneously, the first power supply 23, the second stationary contact of the single-pole double-throw switch 13, the second electromagnet 15, the second spring switch 19, the first electrode of the drive motor 3, the second electrode of the drive motor 3, the first spring switch 18, the first protective resistor 16, and the first master switch 22 are also connected in series. In addition, the first electromagnet 14 is positioned opposite the third spring switch 20, and the second electromagnet 15 is positioned opposite the fourth spring switch 21.

[0076] The lifting control circuit is used to electrically control the drive motor 3 to achieve precise lifting and positioning of the sliding frame 2. Its core function is to receive operation commands and control the start, stop, and direction of the drive motor 3 according to preset logic, thereby adjusting the vertical position of the monitoring unit 5. This circuit can be integrated into the control box and connected to an external operating interface via wired or wireless means. The single-pole double-throw switch 13 is an electrical component with one moving contact and two stationary contacts, where the moving contact can switch between the two stationary contacts. In this application, the single-pole double-throw switch 13 is used to select the power supply circuit of the drive motor 3, thereby controlling the rotation direction of the drive motor 3 and realizing the upward or downward movement of the sliding frame 2. For example, when the switch is flipped to the first stationary contact, the drive motor 3 rotates forward, and the sliding frame 2 rises; when the switch is flipped to the second stationary contact, the drive motor 3 reverses, and the sliding frame 2 descends. The first electromagnet 14 and the second electromagnet 15 act as actuators, generating a magnetic field through current to trigger or reset the corresponding spring switches under specific conditions, thereby controlling the drive motor 3 circuit. For example, when the electromagnet is energized, the magnetic force it generates can disconnect the contacts of the spring switch directly opposite it. The first protective resistor 16 and the second protective resistor 17 are electronic components connected in series in the circuit to limit current. They are connected in series in the two control circuits of the drive motor 3 respectively to prevent excessive current in the circuit, thereby protecting the drive motor 3, the electromagnet, and other electronic components from overload damage and improving the stability and reliability of the system. The first spring switch 18, the second spring switch 19, the third spring switch 20, and the fourth spring switch 21 are spring switches that change the contact state by mechanical force acting on their internal spring mechanism. In this application, these spring switches are used as limit switches or feedback switches. For example, the first spring switch 18 and the second spring switch 19 can serve as travel limit switches. When the sliding frame 2 reaches a preset upper or lower limit position, the power supply to the drive motor 3 is disconnected through mechanical contact to prevent the sliding frame 2 from overtraveling. The third spring switch 20 and the fourth spring switch 21 cooperate with the electromagnet as part of an electromagnetic control circuit to achieve more complex logic control. The first power supply 23 provides the necessary electrical energy to the lifting control circuit. It is typically a DC power supply, and its voltage and current parameters must match the operating requirements of the drive motor 3 and other circuit components to ensure the stable and reliable operation of the entire control system. The lifting control circuit controls the drive motor 3 through a specific series connection. Specifically, the first power supply 23, the first stationary contact of the single-pole double-throw switch 13, the first electromagnet 14, the first spring switch 18, the first electrode of the drive motor 3, the second electrode of the drive motor 3, the second spring switch 19, the second protective resistor 17, and the first master control switch 22 are connected in series to form a loop, which controls the drive motor 3 to rotate in one direction, causing the sliding frame 2 to move upwards.Similarly, the first power supply 23, the second stationary contact of the single-pole double-throw switch 13, the second electromagnet 15, the second spring switch 19, the first electrode of the drive motor 3, the second electrode of the drive motor 3, the first spring switch 18, the first protective resistor 16, and the first master control switch 22 are connected in series to form another circuit, which is used to control the drive motor 3 to rotate in the opposite direction and drive the sliding frame 2 downward. This design ensures that only one direction of the drive circuit is activated at any given time, avoiding short circuits or simultaneous reverse driving of the motor. The first electromagnet 14 is positioned opposite the third spring switch 20, and the second electromagnet 15 is positioned opposite the fourth spring switch 21. This relationship allows the electromagnets to control the spring switches in a non-contact manner, thereby introducing electromagnetic relay-like logic functions into the control circuit, preventing short circuits and controlling the circuit on and off, further enhancing the automation and safety of the lifting control circuit.

[0077] Through the above technical solution, this application effectively solves the problems of inaccurate and unsafe lifting and lowering control of the sliding frame 2. Specifically, the single-pole double-throw switch 13 allows the operator to easily select the upward or downward direction of the monitoring unit 5. Two independent series control circuits, each containing a first electromagnet 14, a second electromagnet 15, a first spring switch 18, a second spring switch 19, a third spring switch 20, a fourth spring switch 21, and a protective resistor, together constitute a complete motor drive and protection mechanism. When the sliding frame 2 needs to rise, the corresponding circuit is selected through the single-pole double-throw switch 13, and the motor 3 starts working; when the sliding frame 2 reaches the preset position or encounters an obstacle, the relevant spring switch is triggered, cutting off the power supply to the motor in time to prevent overshoot or mechanical damage. At the same time, the direct alignment of the first electromagnet 14 with the third spring switch 20, and the second electromagnet 15 with the fourth spring switch 21, provides the system with additional logic control capabilities, such as automatic limit, emergency stop, or position feedback functions, thereby significantly improving the accuracy of the position adjustment of the monitoring unit 5, the safety of operation, and the automation level of the system. This control scheme ensures that monitoring unit 5 can remain stably and reliably at the required height, greatly improving the practicality and reliability of the river flow monitoring system.

[0078] In some embodiments described above, a lifting control circuit is proposed to be electrically connected to the drive motor 3 to adjust the position of the monitoring unit 5. This lifting control circuit includes a single-pole double-throw switch 13, a first electromagnet 14, a second electromagnet 15, a first protective resistor 16, a second protective resistor 17, a first spring switch 18, a second spring switch 19, a third spring switch 20, a fourth spring switch 21, and a first power supply 23. The control circuit enables the drive motor 3 to rotate in both directions, thereby driving the sliding frame 2 to move up and down. However, in practice, if an effective limiting mechanism is lacking, the sliding frame 2 may exceed the preset travel range under the drive of the drive motor 3, leading to equipment damage or inaccurate positioning, thus affecting the stability and reliability of the system.

[0079] In this regard, this application further proposes that the end of the sliding frame 2 is provided with an upper insulating pressure rod and a lower insulating pressure rod from top to bottom. The upper insulating pressure rod is directly opposite the second spring switch 19, and the lower insulating pressure rod is directly opposite the first spring switch 18. When the sliding frame 2 moves upward, the upper insulating pressure rod can operably abut against and disconnect the second spring switch 19. When the sliding frame 2 moves downward, the lower insulating pressure rod can operably abut against and disconnect the first spring switch 18.

[0080] Specifically, the upper and lower insulating pressure bars are mechanical limiting components located at the ends of the sliding frame 2. They are typically made of insulating materials, such as engineering plastics, ceramics, or composite materials, to ensure that they do not cause a short circuit when in contact with the spring switches. The upper insulating pressure bar triggers the corresponding switch when the sliding frame 2 moves upward to its upper limit position, while the lower insulating pressure bar triggers the corresponding switch when the sliding frame 2 moves downward to its lower limit position. The precise positions of these pressure bars determine the effective travel range of the sliding frame 2, thus preventing it from exceeding the safe operating area. The upper insulating pressure bar is positioned opposite the second spring switch 19, meaning that when the sliding frame 2 moves upward, the upper insulating pressure bar will first contact and act on the second spring switch 19. Similarly, the lower insulating pressure bar is positioned opposite the first spring switch 18, indicating that when the sliding frame 2 moves downward, the lower insulating pressure bar will contact and act on the first spring switch 18. This alignment ensures that the corresponding spring switch can be accurately triggered when the sliding frame 2 reaches the preset upper or lower limit position, thereby achieving control of the drive motor 3. When the sliding frame 2 moves upward under the drive of the drive motor 3, the upper insulating pressure bar at its end gradually approaches and eventually abuts against the second spring switch 19. This abutting action causes the contacts of the second spring switch 19 to change from a closed state to an open state. Since the second spring switch 19 is connected in series in the power supply circuit of the drive motor 3, its opening will cut off the power supply to the drive motor 3 in the upward direction, thereby stopping the drive motor 3 and preventing the sliding frame 2 from continuing to move upward beyond the preset upper limit position. Similarly, when the sliding frame 2 moves downward, the lower insulating pressure bar at its end abuts against the first spring switch 18. This abutting action causes the contacts of the first spring switch 18 to change from a closed state to an open state. Since the first spring switch 18 is also connected in series in the power supply circuit of the drive motor 3, its opening will cut off the power supply to the drive motor 3 in the downward direction, thereby stopping the drive motor 3 and preventing the sliding frame 2 from continuing to move downward beyond the preset lower limit position.

[0081] By employing the aforementioned technical solution, an upper insulating pressure rod and a lower insulating pressure rod are installed at the end of the sliding frame 2, respectively, and positioned directly opposite the second spring switch 19 and the first spring switch 18. This application provides an effective mechanical limiting mechanism. When the sliding frame 2 moves upward to the preset upper limit, the upper insulating pressure rod abuts against and disconnects the second spring switch 19, promptly cutting off the power supply to the drive motor 3 for upward movement, thereby preventing the sliding frame 2 from continuing to move upward beyond the safe range. Similarly, when the sliding frame 2 moves downward to the preset lower limit, the lower insulating pressure rod abuts against and disconnects the first spring switch 18, cutting off the power supply to the drive motor 3 for downward movement, preventing the sliding frame 2 from descending excessively. This design can precisely control the lifting and lowering stroke of the sliding frame 2, effectively preventing damage to the equipment due to overload or over-extension, significantly improving the operational safety and reliability of the river flow monitoring system, and ensuring that the monitoring unit 5 always operates stably within the effective working range.

[0082] In some embodiments described above, the position of the monitoring unit 5 is adjusted manually or semi-automatically via a lifting control circuit to adapt to changes in river water level. However, in practical applications, river water level may fluctuate frequently, causing the monitoring unit 5 to be unable to follow the water level changes in real time, thus affecting the accuracy and efficiency of monitoring and requiring frequent manual intervention for adjustment.

[0083] In response, this application further proposes a river flow monitoring system, which also includes a liquid level control circuit. This liquid level control circuit aims to enable the monitoring unit 5 to automatically track the liquid level in order to cope with real-time fluctuations in the river water level. The liquid level control circuit includes a second power supply, a second master control switch 24, a third master control switch 25, a liquid level height switch 26, a third electromagnet 27, a fourth electromagnet 28, a third protective resistor 29, a fourth protective resistor 30, a fifth spring switch 31, and a sixth spring switch 32.

[0084] The liquid level control circuit is a dedicated control circuit designed to automatically adjust the height of the monitoring unit 5 based on real-time changes in the river water level. Electrically connected to the drive motor 3, it receives water level change signals and controls the drive motor 3 to perform lifting and lowering operations, ensuring the monitoring unit 5 remains at a suitable water level depth. This circuit can be integrated into the main control unit or exist as a separate module. Its core function is to receive signals from the liquid level height switch 26 and control the forward and reverse rotation of the drive motor 3 based on the signal status, thereby achieving automatic lifting and lowering of the sliding frame 2. A second power supply provides operating power to the liquid level control circuit. This power can be a DC power source, such as a battery pack or a regulated power module, or it can be obtained from AC mains power through a rectifier circuit. Its voltage and current should meet the operating requirements of each component in the liquid level control circuit. A master control switch controls the overall on / off state of the liquid level control circuit. This can be a manual toggle switch, a push-button switch, or a relay controlled by an electrical signal from the main controller. When the master control switch is closed, the liquid level control circuit starts working; when the master control switch is open, the circuit stops working.

[0085] The liquid level switch 26 is used to detect the real-time height of the river water level and outputs corresponding electrical signals according to water level changes. The liquid level switch 26 includes a fixed tube 33, a float 34, a second conductive rod 35, and a second conductive sleeve 36. The fixed tube 33 is fixedly mounted on the sliding frame 2, ensuring it rises and falls with the monitoring unit 5. The float 34 is slidably disposed inside the fixed tube 33, allowing it to float up and down with the water level. The second conductive rod 35 is insulated in the middle, with one end fixedly mounted on the float 34 and the other end slidably disposed inside the second conductive sleeve 36. The second conductive sleeve 36 is fixedly mounted on the fixed tube 33. When the water level changes, the float 34 drives the second conductive rod 35 to move up and down. The relative position of the second conductive rod 35 and the second conductive sleeve 36 changes, causing different conductive sections (upper or lower) of the second conductive rod 35 to contact the second conductive sleeve 36, thereby forming different conductive paths and outputting different electrical signals to indicate whether the water level is rising or falling.

[0086] In terms of circuit connection, the second power supply, the second master switch 24, the second conductive sleeve 36, the lower section of the second conductive rod 35, the third electromagnet 27, the second electrode of the drive motor 3, the first electrode of the drive motor 3, the sixth spring switch 32, the fourth protective resistor 30, and the third master switch 25 are connected in series. This path is used to control the drive motor 3 to rotate upwards. When the liquid level rises, the lower section of the second conductive rod 35 contacts the second conductive sleeve 36, forming a path, energizing the third electromagnet 27, thereby controlling the drive motor 3 to rise. Simultaneously, the second power supply, the second master switch 24, the second conductive sleeve 36, the upper section of the second conductive rod 35, the fourth electromagnet 28, the first electrode of the drive motor 3, the second electrode of the drive motor 3, the fifth spring switch 31, the third protective resistor 29, and the third master switch 25 are connected in series. This path is typically used to control the drive motor 3 to rotate downwards. When the liquid level falls, the upper section of the second conductive rod 35 contacts the second conductive sleeve 36, forming a path, energizing the fourth electromagnet 28, thereby controlling the drive motor 3 to descend.

[0087] Through the above technical solution, this system can sense changes in river water level in real time. When the water level rises or falls, the liquid level height switch 26 can accurately detect this change and trigger the corresponding electromagnet, thereby controlling the drive motor 3 to automatically adjust the position of the sliding frame 2. This allows the monitoring unit 5 to follow the fluctuations in river water level in real time and always maintain the preset monitoring depth, greatly improving the real-time performance and accuracy of monitoring, and reducing the frequency and labor intensity of manual intervention. At the same time, in conjunction with the original lifting control circuit, this system adds an intelligent automatic liquid level tracking function to provide manual or semi-automatic adjustment capabilities, making the entire river flow monitoring system more intelligent, efficient, and reliable.

[0088] In some embodiments described above, continuous monitoring is achieved by automatically adjusting the position of the monitoring unit 5 according to changes in the liquid level using a liquid level control circuit. However, in actual operation, if the sliding frame 2 is continuously driven to move under the control of the liquid level height switch 26 by the liquid level control circuit, and the sliding frame 2 has reached the upper or lower limit of its physical stroke, it may cause overload of the drive motor 3, damage to the mechanical structure, or the system to fail to respond effectively to changes in the liquid level, thereby affecting the accuracy of monitoring and the reliability of the equipment.

[0089] To address this, this application further proposes connecting a second spring switch 19 in series between the third electromagnet 27 and the second electrode of the drive motor 3, and connecting a first spring switch 18 in series between the fourth electromagnet 28 and the first electrode of the drive motor 3. Specifically, this technical feature integrates the second spring switch 19 into the liquid level control circuit, specifically by connecting it in series between the third electromagnet 27 and the second electrode of the drive motor 3. The second spring switch 19 acts as an upper limit switch; when the sliding frame 2 moves upward to the preset upper limit position, the second spring switch 19 is abutted by the upper insulating pressure rod and disconnected. Through this series connection, once the sliding frame 2 reaches the upper limit, the disconnection of the second spring switch 19 will cut off the circuit between the third electromagnet 27 and the second electrode of the drive motor 3, thereby immediately stopping the upward movement of the drive motor 3 and preventing the sliding frame 2 from continuing to move upward beyond the safe range. Simultaneously, this technical feature also integrates the first spring switch 18 into the liquid level control circuit, specifically by connecting it in series between the fourth electromagnet 28 and the first electrode of the drive motor 3. The first spring switch 18 acts as a lower limit switch. When the sliding frame 2 moves down to the preset lower limit position, the first spring switch 18 is abutted by the lower insulating pressure rod and disconnected. Through this series connection, once the sliding frame 2 reaches the lower limit, the disconnection of the first spring switch 18 will cut off the circuit between the fourth electromagnet 28 and the first electrode of the drive motor 3, thereby immediately stopping the drive motor 3 from moving downward and preventing the sliding frame 2 from continuing to descend beyond the safe range.

[0090] Through the above technical solution, the second spring switch 19 and the first spring switch 18, used to limit the stroke of the sliding frame 2, are connected in series to the circuit paths of the liquid level control circuit that control the upward and downward movement of the drive motor 3. When the liquid level control circuit drives the sliding frame 2 to move upward to the upper limit position, the second spring switch 19 is triggered to open, promptly cutting off the power supply for the drive motor 3 to move upward, thereby effectively preventing the sliding frame 2 from continuing to move upward. Similarly, when the sliding frame 2 moves downward to the lower limit position, the first spring switch 18 is triggered to open, promptly cutting off the power supply for the drive motor 3 to move downward, thereby effectively preventing the sliding frame 2 from continuing to move downward. This design ensures that the liquid level control circuit, while automatically tracking changes in the liquid level, is always protected by physical limit switches, avoiding mechanical damage or overload of the drive motor 3 caused by the sliding frame 2 exceeding its safe stroke due to misjudgment by the liquid level height switch 26 or system failure. This significantly improves the operational safety and equipment reliability of the river flow monitoring system, ensuring that the monitoring unit 5 operates stably within a safe range.

[0091] Through the aforementioned system, multiple monitoring units 5 can acquire water level data at different widths of the river channel in real time. Combined with pre-set river cross-sectional information, the system can calculate the real-time cross-sectional area. Further combining flow velocity measurement or calculating flow velocity from water level changes yields the river flow rate. This integrated, automated monitoring system, compared to the current meter method, avoids the dangers and inefficiencies of on-site personnel measurement; compared to the buoy method, the cooperation of the connecting pipe 6 and the float 7 improves the anti-interference capability and accuracy of water level measurement; and compared to the weir method, it eliminates the need for large-scale modifications to the river channel structure, reducing engineering costs and environmental impact. This system provides a safe, efficient, accurate, and highly adaptable solution for river flow monitoring.

[0092] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0093] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A river flow monitoring system, characterized in that: It includes a support frame, a sliding frame, a drive motor, transmission components, and multiple monitoring units; in The support frame is fixedly installed; The sliding frame is slidably mounted on the support frame; The drive motor is fixedly mounted on the support frame, and the drive motor is connected to the sliding frame through the transmission component to drive the sliding frame to slide up and down along the support frame; Multiple monitoring units are arranged at intervals along the width of the river surface. Each monitoring unit includes a connecting pipe, a float, a first conductive rod, a first conductive sleeve, and an ammeter. The connecting pipe, the first conductive sleeve, and the ammeter are all fixedly mounted on the sliding frame. One opening of the connecting pipe faces upward, while the other opening is operably inserted below the river surface. The float is movably disposed within the connecting pipe. The first conductive sleeve is located above one opening of the connecting pipe. One end of the first conductive rod is fixedly connected to the float, and the other end is slidably disposed within the first conductive sleeve. The first conductive rod, the first conductive sleeve, and the ammeter are sequentially electrically connected to an external power source. The connecting pipe includes straight pipes and bends.

2. The river flow monitoring system as described in claim 1, characterized in that: Multiple monitoring units are arranged sequentially at equal intervals.

3. The river flow monitoring system as described in claim 1, characterized in that: The transmission component includes a rope winding drum and a rope. The rope winding drum is coaxially connected to the shaft of the drive motor. One end of the rope is fixedly connected to the rope winding drum, and the other end of the rope is fixedly connected to the sliding frame.

4. The river flow monitoring system as described in claim 1, characterized in that: The support frame is gantry-shaped, and the two ends of the sliding frame are slidably sleeved on the two support rods of the support frame, respectively. A pulley is provided between the end of the sliding frame and the support rod.

5. The river flow monitoring system as described in any one of claims 1 to 4, characterized in that: It also includes a lifting control circuit, which is electrically connected to the drive motor to adjust the position of the monitoring unit. The control circuit includes a single-pole double-throw switch, a first electromagnet, a second electromagnet, a first protective resistor, a second protective resistor, a first spring switch, a second spring switch, a third spring switch, a fourth spring switch, a first master control switch, and a first power supply. in The first power supply, the first stationary contact of the single-pole double-throw switch, the first electromagnet, the first spring switch, the first electrode of the drive motor, the second electrode of the drive motor, the second spring switch, the fourth spring switch, the second protection resistor are connected in series and the first main control switch is connected in series. The first power supply, the second stationary contact of the single-pole double-throw switch, the second electromagnet, the second spring switch, the second electrode of the drive motor, the first electrode of the drive motor, the first spring switch, the third spring switch, the first protective resistor, and the first main control switch are connected in series; The first electromagnet is positioned opposite the third spring switch; the second electromagnet is positioned opposite the fourth spring switch.

6. The river flow monitoring system as described in claim 5, characterized in that: The sliding frame has an upper insulating rod and a lower insulating rod arranged from top to bottom at its end. The upper insulating rod is directly opposite the second spring switch, and the lower insulating rod is directly opposite the first spring switch. When the sliding frame moves upward, the upper insulating rod can be operated to abut against and disconnect the second spring switch. When the sliding frame moves downward, the lower insulating rod can be operated to abut against and disconnect the first spring switch.

7. The river flow monitoring system as described in claim 6, characterized in that: It also includes a liquid level control circuit, which comprises a second power supply, a second master control switch, a third master control switch, a liquid level switch, a third electromagnet, a fourth electromagnet, a third protective resistor, a fourth protective resistor, a fifth spring switch, and a sixth spring switch. The liquid level switch includes a fixed tube, a float, a second conductive rod, and a second conductive sleeve. The fixed tube is fixedly installed on the sliding frame, the float is slidably disposed inside the fixed tube, the second conductive sleeve is fixedly installed on the fixed tube, the middle part of the second conductive rod is insulated, one end of the second conductive rod is fixedly installed on the float, and the other end of the second conductive rod is slidably disposed inside the second conductive sleeve. The second power supply, the second master control switch, the second conductive sleeve, the lower section of the second conductive rod, the third electromagnet, the second electrode of the drive motor, the first electrode of the drive motor, the sixth spring switch, the fourth protective resistor, and the third master control switch are connected in series. The second power supply, the second master control switch, the second conductive sleeve, the upper section of the second conductive rod, the fourth electromagnet, the first electrode of the drive motor, the second electrode of the drive motor, the fifth spring switch, the third protective resistor, and the third master control switch are connected in series.

8. The river flow monitoring system as described in claim 7, characterized in that: The second spring switch is connected in series between the third electromagnet and the second electrode of the drive motor; the first spring switch is connected in series between the fourth electromagnet and the first electrode of the drive motor.

Images