An assembled flow measuring box

Abstract

The application relates to the technical field of flow measuring boxes, in particular to an assembled flow measuring box which comprises a machine box assembly, a floating part is vertically and slidingly connected to the inner side of the machine box assembly, driving plates are slidingly and clamped to the two sides of the floating part through connecting components, a driving hole is formed in one side of each driving plate, a sensor is slidingly connected to the inner side of each driving hole, the floating part moves the driving plates by the buoyancy brought by water flow, the driving plates change the positions of the sensors through the driving holes, the floating part changes the positions and the intervals of the sensors in real time through water level changes, the sound channel is always in the optimal position, and due to the angle changes of the sensors in the driving holes, the intervals and the positions of the sensors realize nonlinear self-adaptive matching, flow state disturbance and signal interference caused by the sudden shrinkage of the intervals under low water level are avoided, and the measurement range and the precision are considered.

Description

Technical Field

[0001] This invention relates to the field of flow meter technology, specifically an assembled flow meter. Background Technology

[0002] The core components of the flow meter include the main body, multiple pairs of cross-distributed ultrasonic transducers, an electronic water level gauge or ultrasonic level gauge, a data acquisition module, a communication module, and a power supply module. The main body is made of high-strength stainless steel and aluminum alloy, with an IP68 protection rating, making it suitable for harsh outdoor conditions. The ultrasonic transducers are used to measure the laminar flow velocity, while the electronic water level gauge or ultrasonic level gauge accurately monitors the water depth. The data acquisition module processes sensor signals and calculates flow rate using built-in algorithms. The communication module supports the Modbus protocol for remote data transmission. Some flow meters also feature locking mechanisms and instrument panels for convenient maintenance and data viewing. The flow meter primarily operates using the velocity-area method and the ultrasonic time-of-flight method, enabling 24-hour continuous monitoring of water flow and real-time output of instantaneous and cumulative flow rates. It automatically identifies sediment thickness and deducts errors to ensure measurement accuracy, with minimal head loss and no need to alter the original flow pattern.

[0003] Chinese Patent CN114152297B discloses an ultrasonic flow measurement method and apparatus, comprising: installing multiple ultrasonic velocity probes on the flow measurement cross-section of a flow measurement box; each ultrasonic velocity probe is used to measure the water flow velocity at multiple velocity measurement points in the direction of ultrasonic wave propagation; the ultrasonic wave propagation directions of each ultrasonic velocity probe are parallel to each other, coplanar, and intersect the water flow direction at an angle; the velocity measurement points are evenly distributed throughout the entire flow measurement cross-section; when the flow measurement box is full, the flow rate measured by the flow measurement box is obtained based on the number of velocity measurement points on the flow measurement cross-section, the measured water flow velocity along the direction of ultrasonic wave propagation at each velocity measurement point, and the cross-sectional area of ​​the flow passage perpendicular to the water flow direction around the corresponding velocity measurement point.

[0004] In practical applications of existing flow measurement devices, the sensor spacing is generally fixed and cannot be adjusted, failing to fully consider the dynamic characteristics of water flow. When water flow fluctuates or velocity changes, the fixed spacing cannot be adaptively adjusted according to the actual width and depth of the water flow cross-section. At high water levels, insufficient spacing fails to cover the entire water flow cross-section, resulting in incomplete measurement range and incomplete data acquisition. At low water levels, excessive spacing leads to decreased measurement accuracy, making it impossible to accurately capture the true flow state, thus affecting the accuracy and reliability of the measurement results. Alternatively, relying on motors or electric devices for active spacing adjustment presents a core problem: the inability to simultaneously meet the different adjustment needs at high and low water levels. In high water level scenarios, to fully cover the entire water flow cross-section, the sensors need to quickly separate to increase the spacing, and this adjustment method can meet this requirement. However, in low water level scenarios, if the sensors quickly move closer together, the spacing becomes too small, disrupting the normal flow state and causing turbulence, making it difficult to meet the comprehensive requirements for measurement accuracy, range, and adaptability in actual flow measurement work.

[0005] Therefore, the present invention provides an assembled flow measurement box that can achieve non-linear adjustment of sensor spacing with water level changes and can be adapted to measurement of multiple water level intervals. Summary of the Invention

[0006] To address the problems in existing technologies that do not fully consider the dynamic characteristics of water flow, such as the inability of sensor spacing to be adaptively adjusted according to the actual width and depth of the water flow cross-section when water flow fluctuates, an assembled flow measurement box was designed.

[0007] The technical solution adopted by this invention to solve its technical problem is: an assembled flow measurement box, including a chassis assembly, a floating part vertically slidably connected to the inner side of the chassis assembly, and a drive plate slidably connected to both sides of the floating part through connecting parts. A drive hole is opened through one side of each drive plate, and a sensor is slidably connected to the inner side of each drive hole. The floating part relies on the buoyancy brought by the water flow to drive the drive plate to move. The drive plate changes the position of the sensor through the drive hole. The floating part changes the position and spacing of the sensor in real time according to the water level change, so that the measurement channel is always in the optimal position. Moreover, due to the change of the angle of the sensor in the drive hole, the spacing and position of the sensor achieve nonlinear adaptive matching. The higher the water level, the faster the drive plate drives the sensor to separate, which can quickly cover the wide cross-section of the water flow and ensure the integrity of the measurement channel. The lower the water level, the slower the drive plate drives the sensor to approach, avoiding the flow disturbance and signal interference caused by the sudden reduction of the spacing at low water levels, thus balancing the measurement range and accuracy.

[0008] Furthermore, the chassis assembly includes a frame, a motherboard detachably connected to the top of the frame, side panels detachably connected to both sides of the frame, an electrical board box detachably connected inside the motherboard, lifting lugs fixed to the top of the motherboard, support plates detachably connected to the adjacent side of the two side panels, a main beam detachably connected to the adjacent side of the two support plates, and a base plate detachably connected to the bottom of the frame.

[0009] Furthermore, a set of limiting rods is fixed to the inner side of each of the two side plates. The two limiting rods form a set, and the two drive plates are slidably engaged with the outer sides of the two sets of limiting rods. The limiting rods are used to restrict the movement direction of the drive plates, thereby ensuring that the drive plates move horizontally along the water flow direction.

[0010] Furthermore, there are multiple drive holes, and the number of drive holes is the same as the number of sensors. Each drive hole is set as an arc-shaped hole. All drive holes have the same length along the water flow direction but different lengths along the vertical direction. The closer the drive hole is to the main board, the longer the vertical length. Different sensors have different positions and start and end angles in different drive holes. When the adjustment plate moves along the water flow direction, the vertical movement speed of the sensors shows obvious non-linear differences. As a result, the higher the water level, the faster the sensor spacing separates, and the lower the water level, the slower the sensor spacing approaches.

[0011] Furthermore, multiple sensors are provided, and a driving block is fixed on the side of each sensor near the side plate. Each driving block is slidably connected to the inside of one of the driving holes. A through hole is opened through the top of each sensor. A sliding groove is fixed on the side of each of the two support plates that are far apart from each other. A sliding rod is fixed inside the sliding groove, and the sliding rod is located inside the through hole.

[0012] Furthermore, a linkage hole is provided through one side of the drive plate, and a connecting rod is slidably engaged inside the linkage hole. The floating part is fixedly connected to one end of the two connecting rods. The floating part is set as a high-density foam float, a stainless steel hollow float, or other device that can move by using the buoyancy of water flow.

[0013] Furthermore, the connecting rod is slidably connected to the inside of the main beam. The main beam and the drive plate cooperate to restrict the connecting rod and the floating part to move only in the vertical direction. The ends of the two connecting rods away from the floating part are rotatably connected to rollers. The rollers can reduce the frictional loss between the connecting rod and the drive plate when the floating part is impacted by water flow and rotates, thereby improving the service life of the equipment.

[0014] Furthermore, each chute and each main beam is fixed with a sealing element. The sealing element can be set as an accordion-style protective cover or a flexible diaphragm. Stainless steel frame and rubber accordion-style protective covers are installed between the outer edge of the sensor and the chute, as well as between the connecting rod and the main beam. The protective cover moves with the sensor or connecting rod, completely covering the gap between the sensor and the chute, connecting rod and main beam, blocking water flow and impurities.

[0015] The beneficial effects of this invention are: (1) The assembled flow measurement box of the present invention adopts a floating part and a driving plate. The floating part relies on the buoyancy of the water flow to drive the driving plate to move. The driving plate changes the position of the sensor through the driving hole. The floating part adjusts the position and spacing of the sensor in real time with the rise and fall of the water level, so that the measurement channel is always kept in the optimal layout state. At high water level, the driving plate drives the sensor to separate faster, which can quickly cover the wide cross-section of the water flow, ensuring the integrity of the measurement channel and avoiding measurement deviation caused by the inability to cover part of the water flow cross-section due to excessively high water level. At low water level, the driving plate drives the sensor to move closer at a slower speed, which effectively avoids the flow disturbance and signal interference caused by the sudden reduction of the sensor spacing at low water level, and prevents the decrease in measurement accuracy caused by the instability of the flow field. This adaptive adjustment method does not require manual intervention and can automatically adjust according to the actual water flow and water level changes, adapting to the full range of measurement needs from high water level to low water level. Whether it is a wide cross-section with large flow or a narrow cross-section with small flow, it can ensure the rationality of the sensor layout, ensure the comprehensiveness and accuracy of the measurement data, and greatly improve the applicability and scene adaptability of the flow measurement equipment.

[0016] (2) The assembled flow measurement box of the present invention does not require additional power drive, is energy-saving and environmentally friendly, and operates stably and reliably, reducing the cost of equipment use and maintenance difficulty. The sensor position and spacing adjustment of the flow measurement box is achieved entirely by the buoyancy of the water flow and the weight of the components themselves, without the need for additional power devices such as motors and water pumps, which saves electricity consumption. The floating part is raised and lowered under the action of the buoyancy of the water flow, and the connecting rod drives the drive plate to move by the cooperation of its own weight and buoyancy. The sensor adjusts its position by the guidance of its own weight and the drive hole. The entire adjustment process does not require an external power supply and a complex control mechanism. The structure is simple and the operation is smooth, which can effectively avoid equipment downtime caused by power component failure, and reduce the number of equipment maintenance and maintenance costs.

[0017] (3) The assembled flow measurement box of the present invention has an arc-shaped drive hole. All drive holes have the same length along the water flow direction but different lengths along the vertical direction. The closer the drive hole is to the main board, the longer the vertical length. The position and start and end angle of different sensors in different drive holes are also different. Therefore, when the drive board moves along the water flow direction, the vertical movement speed of the sensor shows obvious nonlinear differences. This nonlinear adaptive matching method enables the spacing and position of the sensors to be accurately adjusted according to the water level change, avoiding the disadvantage of not being able to take into account the accuracy of high and low water level measurement under the linear adjustment method. It keeps the sensor in the optimal measurement position and greatly improves the accuracy and reliability of water flow measurement.

[0018] (4) The assembled flow measurement box of the present invention adopts a detachable structural design. The frame is detachably connected to the main board and the side plates, and the support plate is detachably connected to the side plates and the main beam to the support plate. This modular design allows the equipment to be disassembled and packaged during transportation, which greatly reduces the space occupied during transportation, reduces the risk of collision damage during transportation, and also reduces transportation costs. During on-site installation, it can be quickly assembled according to the actual measurement needs without the need for complicated installation tools and professional installation techniques, thus improving installation efficiency. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the frame of the present invention; Figure 4 This is a three-dimensional structural diagram of the motherboard of the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the side plate of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the base plate of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the three-dimensional structure of the base plate of the present invention. Figure 2 ; Figure 8 This is a three-dimensional structural diagram of the driving hole of the present invention; Figure 9 This is a schematic diagram of the three-dimensional structure of the support plate of the present invention; Figure 10 This is a schematic diagram of the three-dimensional structure of the drive board of the present invention; Figure 11 This is a schematic diagram of the sensor's three-dimensional structure according to the present invention; Figure 12 This is a three-dimensional structural diagram of the floating part of the present invention.

[0021] In the diagram: 11. Frame; 12. Main board; 13. Base plate; 14. Electrical board box; 15. Side plate; 16. Lifting lug; 17. Support plate; 18. Main beam; 2. Floating part; 21. Connecting rod; 3. Drive plate; 31. Linkage hole; 32. Drive hole; 33. Limiting rod; 4. Sensor; 41. Through hole; 42. Drive block; 43. Slide rod; 44. Slide groove; 5. Seal. Detailed Implementation

[0022] To make the technical means, technical features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] Example: Figures 1-12 As shown, the assembled flow meter box of the present invention includes a chassis assembly, which includes a frame 11. A main board 12 is detachably connected to the top of the frame 11, and side plates 15 are detachably connected to both sides of the frame 11. An electrical board box 14 is detachably connected inside the main board 12. A lifting lug 16 is fixed to the top of the main board 12. A support plate 17 is detachably connected to the side of the two side plates 15 that are close to each other. A main beam 18 is detachably connected to the side of the two support plates 17 that are close to each other. A base plate is detachably connected to the bottom of the frame.

[0024] In this embodiment, the entire flow meter box can be easily hoisted and moved using the lifting lugs 16, facilitating installation and use at different measurement locations. The circuit board box 14 is detachably connected to the main board 12, facilitating the inspection and maintenance of the internal electronic components. The detachable connection method between the frame 11 and the main board 12, side plate 15, and base plate 13 (e.g., through bolts and sealing rings or other detachable connection methods) makes the flow meter box more convenient to transport and assemble, allowing for flexible adjustment and replacement of components according to actual needs.

[0025] Specifically, a floating part 2 is vertically slidably connected to the inner side of the chassis assembly. Both sides of the floating part 2 are slidably connected to drive plates 3 via connecting components. Each drive plate 3 has a drive hole 32 extending through one side. A sensor 4 is slidably connected to the inner side of each drive hole 32. The sensor 4 can be configured as an ultrasonic transducer, which senses physical quantities related to water flow velocity and converts them into a processable signal for layered measurement of water flow velocity. It is one of the core sensing components in the flow measurement box. Different weights of counterweights can be designed and installed according to actual needs. The floating part 2 relies on the buoyancy of the water flow to move the drive plates 3. The driving plate 3 changes the position of the sensor 4 through the driving hole 32. The floating part 2 changes the position and spacing of the sensor 4 in real time according to the water level change. The measurement channel is always in the optimal position. Due to the angle change of the sensor 4 in the driving hole 32, the spacing and position of the sensor 4 achieve non-linear adaptive matching. The higher the water level, the faster the driving plate 3 drives the sensor 4 to separate, which can quickly cover the wide cross-section of water flow and ensure the integrity of the measurement channel. The lower the water level, the slower the driving plate 3 drives the sensor 4 to approach, avoiding the flow disturbance and signal interference caused by the sudden reduction of the spacing at low water level, and taking into account both measurement range and accuracy.

[0026] In this embodiment, the high water level state is as follows: Figures 1-12 As shown, the floating part 2 keeps the connecting rod 21 in a position under the buoyancy of the water flow. Figure 8At the indicated position, the connecting rod 21 maintains the distance between the sensor 4 and the drive plate 3 and drive block 42, ensuring that the sensor 4 is below the water surface. If the water flow decreases and the water level drops, the buoyancy of the floating part 2 decreases, and the floating part 2 and the connecting rod 21 begin to move downwards under their own weight. The connecting rod 21 slides downwards inside the main beam 18, and the connecting rod 21 drives the drive plate 3 to move horizontally along the limit rod 33 towards the floating part 2 through the linkage hole 31, gradually releasing the restriction on the drive plate 3. At the same time, the sensor 4 moves towards the side closer to the bottom plate 13 due to its own weight. The sensor 4 pulls the drive plate 3 forward through the cooperation of the drive block 42 and the drive hole 32. During this process, because the drive hole 32 is an arc-shaped hole with different lengths along the vertical direction, when the drive plate 3 moves, the drive block 42 drives the sensor 4 to move forward. The sensors 4 slide within the hole 32. The different positions and start and stop angles of the sensors 4 within the different drive holes 32 result in a significant nonlinear difference in the vertical movement speed of the sensors 4. The spacing between the sensors 4 begins to slowly approach, with the sensors 4 closer to the main board 12 moving the fastest and the sensors 4 closer to the base plate 13 moving the slowest. As the water level continues to drop, the spacing between the sensors 4 will further decrease. However, due to the cooperation between the drive block 42 and the arc-shaped drive hole 32, a nonlinear adaptive matching of the sensor spacing is formed between the measurement channel of the sensor 4 and the water flow, avoiding the situation of sudden spacing reduction. This avoids the flow disturbance and signal interference caused by sudden spacing reduction at low water levels, thus ensuring the accuracy of the measurement. Even at low water levels, the sensors 4 can still accurately measure the water flow, providing reliable data for water flow measurement.

[0027] Specifically, a set of limiting rods 33 are fixed on the inner side of each of the two side plates 15. The two limiting rods 33 form a set, and the two drive plates 3 are respectively slidably engaged with the outer side of the two sets of limiting rods 33. The limiting rods 33 are used to restrict the movement direction of the drive plates 3, thereby ensuring that the drive plates 3 move horizontally along the water flow direction.

[0028] In this embodiment, the limiting rod 33 ensures the stability and accuracy of the drive plate 3 during movement. When the floating part 2 drives the connecting rod 21 to move, the connecting rod 21 drives the drive plate 3 through the linkage hole 31. The limiting rod 33 prevents the drive plate 3 from shifting or shaking, ensuring that the drive plate 3 can only move horizontally along the water flow direction. This ensures that the sensor 4 can change its position and spacing in a predetermined manner. This stable movement helps improve the accuracy and reliability of the sensor 4's measurement and avoids positional deviation of the sensor 4 due to unstable movement of the drive plate 3, which would affect the measurement results.

[0029] Specifically, multiple drive holes 32 are provided, and the number of drive holes 32 is the same as the number of sensors 4. Each drive hole 32 is set as an arc-shaped hole. All drive holes 32 have the same length along the water flow direction but different lengths along the vertical direction. The closer the drive hole 32 is to the main board 12, the longer its vertical length. Different sensors 4 have different positions and start and stop angles in different drive holes 32. When the adjustment plate moves along the water flow direction, the vertical movement speed of the sensors 4 shows obvious non-linear differences. Therefore, the higher the water level, the faster the sensors 4 separate; the lower the water level, the slower the sensors 4 approach each other. Multiple sensors 4 are provided. Each sensor 4 has a drive block 42 fixed on the side near the side plate 15. Each drive block 42 is slidably connected to the inside of one of the drive holes 32. Each sensor 4 has a through opening at the top. Through hole 41, two support plates 17 are fixed with sliding grooves 44 on opposite sides, and sliding rods 43 are fixed inside each sliding groove 44, with the sliding rods 43 located inside the through hole 41. One side of drive plate 3 is provided with a linkage hole 31, and a connecting rod 21 is slidably engaged inside the linkage hole 31. Floating part 2 is fixedly connected to the near end of the two connecting rods 21. Floating part 2 is configured as a high-density foam float, a stainless steel hollow float, or other device that can move using the buoyancy of water flow. Connecting rod 21 is slidably connected to the inside of main beam 18. Main beam 18 and drive plate 3 cooperate to restrict connecting rod 21 and floating part 2 to move only in the vertical direction. Rollers are rotatably connected to the ends of the two connecting rods 21 away from floating part 2. The rollers can reduce the frictional wear between connecting rod 21 and drive plate 3 when floating part 2 is impacted and rotated by water flow, thereby improving the service life of the equipment.

[0030] In this embodiment, the shape and parameters of the drive hole 32 can be customized according to actual needs or the drive plate 3 can be replaced during use. When the water level rises again, the buoyancy of the floating part 2 increases, and it begins to move upward. The connecting rod 21 slides upward inside the main beam 18. The connecting rod 21 drives the drive plate 3 to move horizontally in the opposite direction along the limit rod 33 through the linkage hole 31. During the movement of the drive plate 3, the sensor 4 is driven to move upward through the drive hole 32 and the drive block 42. Since the drive hole 32 is an arc-shaped hole with different lengths in the vertical direction, and the positions and start and end angles of different sensors 4 in different drive holes 32 are different, the vertical movement speed of the sensor 4 shows obvious nonlinear differences. The higher the water level, the faster the separation speed of the sensor 4, which can quickly cover the wide cross-section water flow and ensure the integrity of the measurement channel. Thus, the measurement channel of the sensor 4 is always in the optimal position. The position and spacing between each sensor 4 will adapt to the rise of the water level and change, better adapting to the change of water flow conditions, and providing accurate channel positions for water flow measurement at different water levels. Throughout the water level change process, this assembled flow measurement box can flexibly adjust the position and spacing of sensor 4 according to the actual water level, taking into account the measurement range and accuracy under different water levels, which greatly improves the efficiency and reliability of water flow measurement and reduces the risk of measurement errors and equipment damage caused by water level changes.

[0031] Specifically, a sealing element 5 is fixed inside each slide 44 and each main beam 18. The sealing element 5 can be set as an accordion-style protective cover or a flexible diaphragm. Stainless steel frame and rubber accordion-style protective covers are installed between the outer edge of the sensor 4 and the slide 44, as well as between the connecting rod 21 and the main beam 18. The protective cover moves with the sensor 4 or the connecting rod 21, completely covering the gap between the sensor 4 and the slide 44, the connecting rod 21 and the main beam 18, blocking water flow and impurities.

[0032] In this embodiment, the seal 5 moves along with the sensor 4 and the connecting rod 21, always completely covering the gap between the sensor 4 and the slide 44, the connecting rod 21 and the main beam 18, effectively blocking water flow and impurities from entering the equipment and protecting the normal operation of the equipment. This is prior art and will not be described in detail here.

[0033] Working principle: In high water level conditions, such as Figure 1 - Figure 12 As shown, under the action of buoyancy from the water flow, the floating part 2 keeps the connecting rod 21 in a position as shown. Figure 8 The position shown. At this time, the connecting rod 21, with the help of the drive plate 3 and the drive block 42, keeps the sensor 4 at a certain distance and keeps the sensor 4 below the water surface.

[0034] If the water flow decreases and the water level drops, the buoyancy of the floating part 2 decreases, and the floating part 2 and the connecting rod 21 begin to move downward under their own weight. The connecting rod 21 drives the drive plate 3 to move horizontally along the limit rod 33 towards the floating part 2 through the linkage hole 31, gradually releasing the restriction on the drive plate 3. At the same time, the sensor 4 moves towards the side closer to the bottom plate 13 due to its own weight. The sensor 4 pulls the drive plate 3 forward through the cooperation of the drive block 42 and the drive hole 32. During this process, since the drive hole 32 is an arc-shaped hole with different lengths in the vertical direction, the drive block 42 slides in the drive hole 32 when the drive plate 3 moves. The positions and starting and ending angles of different sensors 4 in different drive holes 32 are different, which makes the vertical movement speed of the sensor 4 show obvious non-linear differences. The spacing of the sensor 4 begins to slowly approach. The sensor 4 closer to the main board 12 moves the fastest, and the sensor 4 closer to the bottom plate 13 moves the slowest, avoiding the situation of sudden shrinkage of the spacing and ensuring measurement accuracy. When the water level rises again, the buoyancy of the floating part 2 increases, and it begins to move upward. The connecting rod 21 slides upward inside the main beam 18, driving the drive plate 3 to move horizontally in the opposite direction along the limit rod 33 through the linkage hole 31. The higher the water level, the faster the sensor 4 spacing separation speed, which can quickly cover the wide cross-section of the water flow, ensuring the integrity of the measurement channel, thus always keeping the measurement channel of the sensor 4 in the optimal position, providing accurate channel position for water flow measurement at different water levels.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An assembled flow meter box, comprising a chassis assembly, characterized in that: The inner side of the chassis assembly is vertically slidably connected to a floating part. Both sides of the floating part are slidably connected to a drive plate through a connecting component. A drive hole is opened through one side of each drive plate, and a sensor is slidably connected to the inner side of each drive hole. The floating part relies on the buoyancy of the water flow to move the drive plate. The drive plate changes the position of the sensor through the drive hole. The floating part changes the position and spacing of the sensor in real time according to the water level change. The measuring channel is always in the optimal position. Moreover, due to the change of the angle of the sensor in the drive hole, the spacing and position of the sensor achieve non-linear adaptive matching. The higher the water level, the faster the drive plate drives the sensor to separate. The lower the water level, the slower the drive plate drives the sensor to move closer.

2. The assembled flow meter according to claim 1, characterized in that: The chassis assembly includes a frame, a motherboard detachably connected to the top of the frame, side panels detachably connected to both sides of the frame, an electrical board box detachably connected inside the motherboard, lifting lugs fixed to the top of the motherboard, support plates detachably connected to the adjacent side of the two side panels, a main beam detachably connected to the adjacent side of the two support plates, and a base plate detachably connected to the bottom of the frame.

3. The assembled flow meter box according to claim 2, characterized in that: A set of limiting rods is fixed to the inner side of each of the two side plates. The two limiting rods form a set, and the two drive plates are slidably engaged with the outer sides of the two sets of limiting rods. The limiting rods are used to restrict the movement direction of the drive plates, thereby ensuring that the drive plates move horizontally along the water flow direction.

4. The assembled flow meter box according to claim 3, characterized in that: The drive hole is provided in multiple ways, and the number of drive holes is the same as the number of sensors. Each drive hole is set as an arc-shaped hole. All drive holes have the same length along the water flow direction, but different lengths along the vertical direction. The closer the drive hole is to the main board, the longer the vertical length. Different sensors have different positions and start and end angles in different drive holes. When the adjustment plate moves along the water flow direction, the vertical movement speed of the sensors shows obvious non-linear differences. As a result, the higher the water level, the faster the sensor spacing separates, and the lower the water level, the slower the sensor spacing approaches.

5. The assembled flow meter box according to claim 4, characterized in that: The sensor is provided in multiple ways. Each sensor has a drive block fixed on the side near the side plate. Each drive block is slidably connected to the inside of one of the drive holes. Each sensor has a through hole at the top. The two support plates are fixed with a sliding groove on the side away from each other. A sliding rod is fixed inside the sliding groove and the sliding rod is located inside the through hole.

6. The assembled flow meter according to claim 2, characterized in that: One side of the drive plate is provided with a linkage hole, and the inner side of the linkage hole is slidably engaged with a connecting rod. The floating part is fixedly connected to the near end of the two connecting rods. The floating part is set as a high-density foam float or a stainless steel hollow float or other device that can move by the buoyancy of water flow.

7. The assembled flow meter box according to claim 6, characterized in that: The connecting rod is slidably connected to the inside of the main beam. The main beam and the drive plate cooperate to restrict the connecting rod and the floating part to move only in the vertical direction. The ends of the two connecting rods away from the floating part are rotatably connected to rollers. The rollers can reduce the frictional loss between the connecting rod and the drive plate when the floating part is impacted by water flow and rotates, thereby improving the service life of the equipment.

8. The assembled flow meter according to claim 5, characterized in that: Each of the aforementioned chutes and the inner side of each main beam is fixed with a sealing element. The sealing element can be set as an accordion-style protective cover or a flexible diaphragm. Stainless steel frame and rubber accordion-style protective covers are installed between the outer edge of the sensor and the chutes, as well as between the connecting rod and the main beam. The protective covers move with the sensor or the connecting rod, completely covering the gap between the sensor and the chutes, connecting rod and main beam, blocking water flow and impurities.

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