A portable high-precision water depth measuring device for a water measuring weir

Abstract

The utility model discloses a portable high-precision water depth measuring device for water measuring weir relates to hydraulic engineering monitoring technical field. The device includes door -shaped support, vertical lifting mechanism, measuring scale, conductivity probe and signal processing and display unit. Door -shaped support is used for being straddled on the water measuring weir side wall, forms stable measuring platform, and measuring scale is installed on door -shaped support through vertical lifting mechanism, can move vertically, and conductivity probe is located at the bottom of measuring scale, is used for contacting water body, and signal processing and display unit real -time monitoring conductivity signal. The device utilizes conductivity sudden change principle to determine the contact water surface, eliminates visual error and surface tension influence in traditional manual observation, improves the objectivity and precision of measurement, and simultaneously, the door -shaped support structure makes the operating personnel not to probe to weir groove edge, greatly improves the operation safety, has the data automatic record and the calculation function, improves work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering monitoring technology, specifically to a portable, high-precision water depth measurement device for monitoring the head of water measuring weirs, particularly those downstream of dams. Background Technology

[0002] In the operation and management of water conservancy projects, measuring weirs (such as triangular weirs and rectangular weirs) are important facilities for monitoring the seepage flow of dams. In order to ensure the accuracy of flow calculation, the water head (water depth) above the measuring weir must be accurately measured and calibrated regularly.

[0003] In existing technologies, on-site water depth measurement mainly relies on manual contact measurement using probes, measuring tapes, or rulers. This method has significant drawbacks: First, due to the surface tension of water, the probe deforms upon contact with the water surface, leading to reading inaccuracies. Second, in poor lighting conditions or when the water surface is oily or foamy, it is difficult for the human eye to accurately determine the contact line between the water surface and the measuring tape, resulting in significant subjective errors. Third, measurement personnel often need to lean out or even descend into slippery weir edges to operate, posing safety hazards such as falls. Finally, traditional manual recording methods are inefficient and the data is not traceable.

[0004] Therefore, there is an urgent need for a high-precision measuring device that can eliminate visual errors, ensure personnel safety, and is easy to operate. Utility Model Content

[0005] The purpose of this invention is to provide a portable, high-precision water depth measuring device for water measuring weirs, in order to solve the problems of low accuracy, high safety risks, and low efficiency of manual measurement in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A portable, high-precision water depth measuring device for a water measuring weir, comprising: A portal frame, serving as the main support structure, includes a crossbeam and two legs connected to both ends of the crossbeam. The two legs are used to span the side wall of the measuring weir. A vertical lifting mechanism is installed on the crossbeam of the portal frame; A measuring ruler is connected to the vertical lifting mechanism, and the measuring ruler can move vertically up and down relative to the crossbeam under the drive of the vertical lifting mechanism. A conductivity probe is fixedly installed at the bottom end of the measuring ruler; The signal processing and display unit is electrically connected to the conductivity probe and is used to monitor the conductivity signal in real time. When the conductivity changes abruptly, it automatically records and displays the scale value of the current measuring scale.

[0008] Furthermore, the portal frame is also equipped with a horizontal calibration device to indicate the horizontal state of the device; the bottom of the support leg is equipped with a height-adjustable support pad to adjust the level of the support, thereby ensuring that the measuring ruler is vertical.

[0009] Furthermore, the vertical lifting mechanism includes an adjustment knob rotatably mounted on the crossbeam, and a rack and pinion transmission assembly connecting the adjustment knob and the measuring scale, for achieving precise manual lifting adjustment. Alternatively, the vertical lifting mechanism can also employ a micro stepper motor for automated control.

[0010] Furthermore, the signal processing and display unit integrates a data recording and calculation module, which can record the height H1 when the probe contacts the water surface and the height H2 when it contacts the bottom of the weir, and automatically calculate the water depth H=H2-H1.

[0011] The beneficial effects of this utility model are as follows: High measurement accuracy: By utilizing the principle of conductivity change to replace human eye interpretation, surface tension and visual errors are eliminated, and the measurement accuracy can reach the millimeter level.

[0012] Operational safety: The unique gantry bracket design adopts a "straddle" installation, allowing surveyors to operate from a safe position above the weir wall without having to lean into the danger zone.

[0013] Highly adaptable to the environment: conductivity testing is minimally affected by water color, oil, foam, and light.

[0014] Data traceability: Electronic recording and calculation avoid errors caused by manual reading and calculation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a partial structural schematic diagram of the vertical lifting mechanism of this utility model;

[0017] Figure 3 This is the measurement principle flow chart and signal unit block diagram of this utility model.

[0018] Figure 4 This is a schematic diagram of the usage state of this utility model.

[0019] Reference numerals: 1. Portal bracket; 11. Crossbeam; 12. Support leg; 13. Support foot pad; 2. Vertical lifting mechanism; 21. Adjustment knob; 31. Precision rack; 3. Measuring ruler; 4. Conductivity probe; 5. Signal processing and display unit; 6. Horizontal calibration device. H1. Distance between the crossbeam and the water surface; H2. Distance between the crossbeam and the bottom plate of the measuring weir. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] like Figure 1 As shown, the present invention provides a portable high-precision water depth measuring device for measuring weirs, which mainly includes a portal frame 1, a vertical lifting mechanism 2, a measuring ruler 3, a conductivity probe 4, and a signal processing and display unit 5.

[0022] The portal frame 1 consists of a crossbeam 11 and two legs 12, preferably made of lightweight, high-strength aerospace-grade aluminum or carbon fiber. The spacing of the legs 12 is designed to cover the width of a common measuring weir, or it can be designed as an adjustable structure. Supporting feet 13 are provided at the bottom of the legs 12, and these feet are threaded together for fine-tuning the height. A leveling device 6 (such as a circular bubble level) is mounted on the upper surface of the crossbeam 11. Before use, the bubble level is centered by adjusting the supporting feet 13, ensuring that the crossbeam 11 is level. This, in turn, ensures that the measuring ruler 3 passing through the crossbeam remains vertical, avoiding measurement errors caused by tilting.

[0023] The measuring ruler 3 is vertically inserted through the middle of the crossbeam 11. The vertical lifting mechanism 2 is used to drive the measuring ruler 3 to move up and down. In this embodiment, as... Figure 2 As shown, the vertical lifting mechanism 2 is manually operated, including an adjustment knob 21 and internal gears (not shown). The measuring scale 3 has a precision rack 31 on its side. Rotating the adjustment knob 21 will drive the measuring scale 3 to rise and fall smoothly and accurately.

[0024] The conductivity probe 4 is fixed at the bottom of the measuring scale 3 and is made of corrosion-resistant stainless steel. The probe is connected to the signal processing and display unit 5, which is mounted on the crossbeam or held in the hand, via a wire.

[0025] Working principle explanation:

[0026] During measurement, first place the device across the side wall of the measuring weir and level it.

[0027] Step 1 (Water Surface Measurement): Operate the vertical lifting mechanism 2 to slowly lower the measuring scale 3. Due to air insulation, the conductivity is extremely low; the instant the tip of the conductivity probe 4 contacts the water surface, the circuit medium changes to water, and the conductivity undergoes a jump (abrupt change) of orders of magnitude. The signal processing and display unit 5 captures this abrupt change signal, issues a buzzer alert, and automatically locks or allows manual confirmation to record the scale reading (or the displacement value of the internal sensor) at this moment, denoted as H1.

[0028] Step 2 (Weir Bottom Measurement): Continue lowering the measuring ruler 3 until the conductivity probe 4 (or the dedicated bottom-contact probe at the bottom of the measuring ruler) physically contacts the bottom of the weir channel. At this point, the operator feels resistance or observes the bottom contact and records the reading as H2.

[0029] Step 3 (Calculation): The microprocessor inside the signal processing and display unit 5 automatically calculates the current water depth value according to the formula water depth H = H2 - H1 and displays it on the screen.

[0030] In summary, this device achieves high-precision contact measurement under non-visual conditions through electromechanical integration, solving the pain points in traditional hydraulic surveying.

[0031] It should be understood that the above embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. All equivalent structural modifications made based on the overall concept of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A portable, high-precision water depth measuring device for a water measuring weir, characterized in that, include: A portal frame (1) includes a crossbeam (11) and two legs (12) connected to both ends of the crossbeam (11). The two legs (12) are used to span the side wall of the measuring weir. A vertical lifting mechanism (2) is installed on the crossbeam (11) of the portal frame (1); The measuring ruler (3) is connected to the vertical lifting mechanism (2), and the measuring ruler (3) can move vertically up and down relative to the crossbeam (11) under the drive of the vertical lifting mechanism (2). The conductivity probe (4) is fixedly installed at the bottom of the measuring ruler (3); The signal processing and display unit (5) is electrically connected to the conductivity probe (4) and a DC power supply respectively; the signal processing and display unit (5) is used to monitor the conductivity change signal of the conductivity probe (4) and record the corresponding height value of the measuring ruler (3) according to the sudden change of conductivity.

2. The portable high-precision water depth measuring device for a water measuring weir according to claim 1, characterized in that, The portal frame (1) is also equipped with a horizontal calibration device (6); the bottom of the support leg (12) is equipped with a height-adjustable support pad (13).

3. A portable high-precision water depth measuring device for a water measuring weir according to claim 2, characterized in that, The horizontal calibration device (6) is a circular bubble level or an electronic level, which is fixedly installed on the upper surface of the crossbeam (11).

4. A portable high-precision water depth measuring device for a water measuring weir according to claim 1, characterized in that, The vertical lifting mechanism (2) includes: Adjust the knob (21), which is rotated on the crossbeam (11); The transmission component is located inside or on the side of the crossbeam (11) and connects the adjustment knob (21) and the measuring scale (3) to convert the rotational motion of the adjustment knob (21) into the linear lifting motion of the measuring scale (3).

5. A portable high-precision water depth measuring device for a water measuring weir according to claim 4, characterized in that, The transmission component is a gear and rack mechanism. The measuring ruler (3) has a rack on its side, and the adjusting knob (21) is connected to a gear that meshes with the rack.

6. A portable high-precision water depth measuring device for a water measuring weir according to claim 1, characterized in that, The vertical lifting mechanism (2) is a micro stepper motor, which is connected to the signal processing and display unit (5) through a control circuit to drive the measuring ruler (3) to automatically lift and lower.

7. A portable high-precision water depth measuring device for a water measuring weir according to claim 1, characterized in that, The signal processing and display unit (5) includes a microprocessor module, a signal conditioning circuit, a display screen, and a keypad; The display screen is used to display real-time measurement data and calculated water depth results; The microprocessor module is configured to: record the first height value H1 when the conductivity probe (4) is detected to be in contact with the water surface and generate a conductivity step signal; and record the second height value H2 when the conductivity probe (4) is detected to be in contact with the bottom of the weir, and calculate the water depth H=H2-H1.

8. A portable high-precision water depth measuring device for a water measuring weir according to claim 1, characterized in that, The conductivity probe (4) is made of corrosion-resistant stainless steel, and the measuring ruler (3) has millimeter-precision scale lines engraved on its surface.

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