An automatic flow measuring device for channel section with telescopic rod

Abstract

The utility model discloses a telescopic rod formula channel section automatic flow measuring device, including the track on the channel of horizontal crossing and the measurement trolley on the track of running, the measurement trolley is equipped with driving wheel and driven wheel, driving wheel is by motor I drive, carries the telescopic rod of vertical setting, measurement and data processing module and data remote transmission module on the measurement trolley, the telescopic rod is by motor II drive, and the flow velocity measuring device and water depth measuring device are installed to the lower extreme of telescopic rod, be equipped with encoder on driven wheel, measurement and data processing module analog artificial flow velocity appearance fine measurement method control measurement trolley realizes flow velocity measurement, and adopts flow velocity area method to calculate section flow. The utility model can realize the accurate measurement of channel section flow, can greatly improve work efficiency, save the measurement cost.

Description

Technical Field

[0001] This utility model belongs to the field of water conservancy surveying, and in particular, it is an automatic flow measurement device for channel cross-sections using a telescopic rod. Background Technology

[0002] Currently, there are many devices and methods for automated and intelligent cross-sectional flow measurement in open channels. Generally, flow measurement is based on the velocity-area method theory, which calculates the average flow velocity per unit time of a certain cross-section, and then measures the cross-sectional area of ​​the same section during the same period. The product of the two yields the flow rate of the cross-section at that time.

[0003] However, no single device is suitable for all flow measurement conditions, especially for branch canals and distribution canals with high sediment content. No single device is suitable for measuring cross-sectional flow during canal discharge, because during discharge, the water level and flow velocity vary due to flow control. At higher flow rates, the water level is relatively high and the flow velocity is fast, making sediment deposition less likely. At lower flow rates, the water level is low and the flow velocity is relatively slow, causing sediment to accumulate at the canal bottom, resulting in uneven sediment deposition and altering the original designed cross-sectional area. This phenomenon is dynamic and changes with flow control, making accurate calculation of the actual flow area difficult.

[0004] In this situation, it is difficult to achieve accurate flow measurement under these conditions using methods such as water level-flow curves, flow measurement boxes, radar flow meters, and ultrasonic time-of-flight flow meters. Currently, the only method for measuring this condition is the traditional manual flow meter method. This involves workers first setting up measuring verticals on the measuring bridge according to the existing water surface width and the water measurement regulations. Then, holding a measuring rod, they use the rod to detect the actual water depth at each vertical position. Following the regulations, a rotor flow meter is placed at the corresponding position on the measuring rod and submerged in the water to measure the flow velocity along that vertical. Because of the different siltation patterns at the bottom of the channel, each vertical must be measured using a measuring rod. Finally, an integration method is used to calculate the actual flow area of ​​the entire cross-section.

[0005] Patent document CN110954069A, published on April 3, 2020, discloses a precise flow measurement device and method for river cross-section probing, which automates the precise measurement method using a manual current meter. The device includes an armored signal cable, a drive motor, a winding device, a pulley-oriented measuring device, a cable anti-sway structure, a water depth measuring device, and a flow velocity measuring device. The drive motor of the winding device is connected to the winding reel via a transmission shaft. One end of the armored signal cable is inserted into and fixed to the winding reel, and the armored signal cable is wound around the winding reel. The armored signal cable passes through the directional pulley, and the measuring device passes downward through the middle cable fixing hole of the anti-sway frame body. The other end of the armored signal cable is connected to the water depth measuring device and the flow velocity measuring device. This device uses an armored cable lowered and fixed to connect the water depth measuring device and the flow velocity measuring device. Because the cable is flexible, it will sway under the action of water flow, causing deviation in the measurement position and resulting in inaccurate measurement results. Furthermore, the float-type bottom-probing limit switch is designed at the lower end of the current meter, affecting the minimum water depth that the current meter can measure. Utility Model Content

[0006] This utility model provides a telescopic rod type automatic flow measurement device for channel cross-sections to solve the technical problems existing in the prior art. This device can realize accurate measurement of the flow rate of the channel cross-section, which can greatly improve work efficiency and save measurement costs.

[0007] The technical solution adopted by this utility model to solve the technical problems existing in the prior art is as follows: a telescopic rod type automatic flow measurement device for channel cross-sections, including a track spanning the channel and a measuring trolley traveling on the track. The measuring trolley is equipped with a drive wheel and a driven wheel. The drive wheel is driven by motor I. A vertically arranged telescopic rod, a measurement and control and data processing module, and a data transmission module are mounted on the measuring trolley. The telescopic rod is driven by motor II. A flow velocity measuring device and a water depth measuring device are installed at the lower end of the telescopic rod. The water depth measuring device includes a housing, a water surface measurement contact point, and a float-type bottom-probing limit switch. The water surface measurement contact point is located on the outside of the housing, and the float-type bottom-probing limit switch is located inside the housing. An encoder is provided on the driven wheel. The measurement and control and data processing module controls the measuring trolley to realize flow velocity measurement by simulating the precise measurement method of a manual flow meter and calculates the cross-sectional flow rate using the flow velocity area method. The processed and calculated data of the measurement and control and data processing module are transmitted through the data transmission module.

[0008] Based on the above solution, the present invention has made the following improvements:

[0009] The water depth measuring device is located behind the flow velocity measuring device.

[0010] The motor I is a variable speed motor.

[0011] The motor II is a Hall motor.

[0012] The measuring trolley is also equipped with a battery to power the device.

[0013] The flow velocity measuring device is a rotor flow velocity meter.

[0014] The trolley track is fixed on a support frame that spans the channel. Both ends of the support frame are supported by bases. Anti-theft net covers are fixed on the support frame and installed on uprights. The uprights are fixed on both sides of the support frame. The anti-theft net covers have access doors at both ends and are located at the ends of the support frame.

[0015] The advantages and positive effects of this invention are as follows: The use of a rigid telescopic rod to mount the flow velocity measuring device realistically simulates the manual measurement of water depth using a measuring rod, solving the problem of insufficient accuracy in flow measurement using a wire rope-mounted flow velocity meter; the use of an encoder on the driven wheel to determine displacement achieves precise positioning of the measuring trolley; the use of a variable-speed motor to drive the measuring trolley, with deceleration before braking, further improves the positioning accuracy of the measuring trolley; by improving the positioning accuracy of the measuring trolley and the flow velocity meter, accurate measurement of channel cross-sectional flow can be achieved; the use of a measurement and control and data processing module to automate and intelligentize the measurement process greatly improves work efficiency and saves measurement costs. This device is applicable to various types of channel flow measurement, especially channels with high sand content, where siltation and cross-sectional flow change in real time, enabling accurate measurement of cross-sectional flow. This invention effectively automates the manual flow velocity meter measurement method and avoids the manual calculation and archiving process after measurement, greatly improving work efficiency and saving measurement costs. Furthermore, by placing the water depth measuring device behind, rather than below, the flow velocity measuring device is not limited in its measurement depth. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the application of this utility model;

[0017] Figure 2 This is a schematic diagram of the measuring trolley of this utility model;

[0018] In the diagram: 1. Measuring trolley; 1-1. Drive wheel; 1-2. Driven wheel; 2. Trolley track; 3. Telescopic rod; 4. Flow measurement device; 5. Water depth measurement device; 6. Battery; 7. Support frame; 8. Base; 9. Upright pole. Detailed Implementation

[0019] To further understand the utility model's content, features, and effects, the following embodiments are provided, along with detailed descriptions in conjunction with the accompanying drawings:

[0020] Please see Figures 1-2 An automatic flow measurement device for channel cross-section using a telescopic rod includes a track 2 spanning the channel and a measuring trolley 1 traveling on the track 2.

[0021] The measuring trolley 1 is equipped with a drive wheel 1-1 and a driven wheel 1-2. The drive wheel 1-1 is driven by a motor I, which is connected to the drive wheel 1-1 through a transmission mechanism. The measuring trolley 1 is equipped with a vertically arranged telescopic rod 3, a measurement and control and data processing module, and a data remote transmission module. The telescopic rod 3 is driven by a motor II. A flow velocity measuring device 4 and a water depth measuring device 5 are installed at the lower end of the telescopic rod 3. For the specific structure of the water depth measuring device 5, please refer to patent document CN110954069A. The water depth measuring device 5 includes a housing, a water surface measuring contact point, and a float-type bottom-probing travel switch. The water surface measuring contact point is located on the outside of the housing, and the float-type bottom-probing travel switch is located inside the housing. The water surface measuring contact point obtains the time point of contact with the water surface, and the float-type bottom-probing travel switch obtains the time point of contact with the bottom.

[0022] An encoder is provided on the driven wheel 1-2.

[0023] The measurement and control and data processing module simulates the precise measurement method of an artificial flow meter to control the measuring trolley to achieve flow velocity measurement and uses the flow velocity area method to calculate the cross-sectional flow rate.

[0024] The data processed and calculated by the measurement, control and data processing module is sent through the data transmission module.

[0025] The aforementioned automatic flow measurement device uses a rigid telescopic rod to carry a flow velocity measuring device for flow measurement, which can realistically simulate the process of manually measuring water depth with a measuring rod, thus solving the problem of insufficient accuracy in flow measurement using a wire rope-mounted flow velocity meter. It uses an encoder on the driven wheel to determine the displacement to achieve precise positioning of the measuring trolley. It uses a measurement and control and data processing module to achieve automation and intelligence in the measurement.

[0026] The more preferred solution in this embodiment is as follows:

[0027] The water depth measuring device 5 is located behind the flow velocity measuring device 4, rather than below it, so as not to affect the lower limit of the water depth measured by the flow velocity measuring device, making the lower limit of the water depth measured by the automatic flow measuring device the same as the lower limit of the water depth measured by the manual measuring rod.

[0028] The motor I is a variable speed motor that decelerates before the measuring carriage 1 brakes, allowing the measuring carriage to be positioned more precisely on the measuring vertical line, which can further improve the measurement accuracy.

[0029] The motor II is a Hall motor, which enables the telescopic rod to provide an accurate telescopic distance, thereby making water depth measurement more accurate.

[0030] The measuring trolley 1 is also equipped with a battery 6 to power the device, which is convenient to use and avoids the need to set up temporary power supply.

[0031] The flow velocity measuring device 4 is a rotor flow meter, which has stable and reliable performance.

[0032] The trolley track 2 is fixed on the support frame 7 that spans the channel. The two ends of the support frame 7 are supported by bases 8. An anti-theft mesh cover is fixed on the support frame 7. The anti-theft mesh cover is installed on the uprights 9. The uprights 9 are fixed on both sides of the support frame 7. An anti-theft door is provided at both ends of the anti-theft mesh cover. The anti-theft door is located at the end of the support frame 7. The anti-theft mesh cover can protect the safety of the measuring trolley.

[0033] Application examples:

[0034] Once the measurement work begins, the measuring trolley moves to the middle of the channel and lowers the telescopic boom. The lowering stops the moment the water surface measurement contact point touches the water surface. The measurement, control, and data processing module records the lowering distance of the boom as... The distance from the initial position of the telescopic boom to the original designed depth of the channel is denoted as . The current water level .

[0035] The distance between the water level h and the slope ratio r (assuming both slope ratios are the same) can be calculated and denoted as: and ,Right now , The width of the canal bottom is known. The water surface is wide According to the "Specification for Water Measurement of Irrigation Canal Devices GB / T 21303-2017", the spacing of the water surface measurement vertical lines is automatically set.

[0036] The equipment then returns to the starting point at the edge of the channel and travels from one side of the channel to the other, determining the location of the measuring points according to the vertical spacing. Upon reaching the first measuring point, the telescopic rod is lowered until it stops at the bottom of the water. During this process, the telescopic rod has been lowered a distance from the water surface when the water surface measurement contact point comes into contact with the water. The distance the telescopic rod descends after it touches the bottom and stops is recorded as . The actual water depth .

[0037] The measurement and control and data processing module can automatically determine the relative water depth position of the flow meter when collecting stratified flow velocity based on the actual water depth and in accordance with the standard GB / T21303-2017 "Specification for Water Measurement of Irrigation Canal Devices". Then, the telescopic rod is activated to raise the flow meter to the water depth to be measured for stratified flow velocity collection.

[0038] After completing the measurement at the first measuring point, repeat the above flow velocity measurement steps until the flow velocity measurements at all vertical measuring positions are completed.

[0039] Finally, the cross-sectional flow rate is calculated using the velocity-area method. For specific calculation steps, please refer to patent document CN110954069A.

[0040] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and these all fall within the protection scope of the present invention.

Claims

1. A telescopic rod type automatic flow measurement device for channel cross-sections, characterized in that, This includes a track spanning the canal and a measuring trolley traveling on the track. The measuring trolley is equipped with a drive wheel and a driven wheel. The drive wheel is driven by motor I. The measuring trolley is equipped with a vertically arranged telescopic rod, a measurement and control and data processing module and a data remote transmission module. The telescopic rod is driven by motor II. A flow velocity measuring device and a water depth measuring device are installed at the lower end of the telescopic rod. The water depth measuring device includes a housing, a water surface measuring contact point and a float-type bottom-probing limit switch. The water surface measuring contact point is located on the outside of the housing, and the float-type bottom-probing limit switch is located inside the housing. An encoder is provided on the driven wheel; The measurement and control and data processing module simulates the precise measurement method of an artificial flow meter to control the measuring trolley to achieve flow velocity measurement and uses the flow velocity area method to calculate the cross-sectional flow rate. The data processed and calculated by the measurement, control and data processing module is sent through the data transmission module.

2. The telescopic rod type automatic flow measurement device for channel cross-sections according to claim 1, characterized in that, The water depth measuring device is located behind the flow velocity measuring device.

3. The telescopic rod type automatic flow measurement device for channel cross-sections according to claim 1, characterized in that, The motor I is a variable speed motor.

4. The telescopic rod type automatic flow measurement device for channel cross-sections according to claim 1, characterized in that, The motor II is a Hall motor.

5. The telescopic rod type automatic flow measurement device for channel cross-sections according to claim 1, characterized in that, The measuring trolley is also equipped with a battery to power the device.

6. The telescopic rod type automatic flow measurement device for channel cross-sections according to claim 1, characterized in that, The flow velocity measuring device is a rotor flow velocity meter.

7. The telescopic rod type automatic flow measurement device for channel cross-sections according to claim 1, characterized in that, The trolley track is fixed on a support frame that spans the channel. Both ends of the support frame are supported by bases. Anti-theft net covers are fixed on the support frame and installed on uprights. The uprights are fixed on both sides of the support frame. The anti-theft net covers have access doors at both ends and are located at the ends of the support frame.

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