Rectangular open channel water flow weighing device, automatic flow measuring device and flow measuring method

Abstract

The invention provides a rectangular open channel water flow weighing device, an automatic flow measuring device and a flow measuring method. The weighing sensor comprises a shell and a sensor body arranged in the shell, and the bottom of one end of the shell is connected with the top of the mounting base; the weighing plate is arranged along the width direction of the rectangular open channel; the top end of the force transmission column is connected with the weighing plate, and the bottom end of the force transmission column extends into the shell and then is connected with the input end of the sensor body; the input end of the signal conversion module is electrically connected with the output end of the sensor body, and the signal conversion module is used for converting a pressure signal sensed by the weighing sensor into a weight signal; the input end of the digital display instrument is electrically connected with the output end of the signal conversion module; the device has the advantages of being simple in structure, convenient to install and maintain, low in equipment cost, capable of conducting real-time detection, high in detection efficiency, capable of adapting to a complex water flow environment and accurate in detection result. The method is suitable for the technical field of rectangular open channel automatic flow measurement.

Description

Technical Field

[0001] The present application relates to the technical field of automatic flow measurement for rectangular open channels, and particularly relates to a rectangular open channel water flow weighing device, an automatic flow measurement device, and a flow measurement method. Background Art

[0002] In water conservancy projects, environmental monitoring, and agricultural irrigation, the accurate measurement of water flow in open channels is an indispensable technology. Currently, common flow measurement methods include the velocity - area method, ultrasonic flowmeter measurement method, and electromagnetic flowmeter measurement method. These methods show certain advantages in different application scenarios, but their limitations also restrict their widespread promotion and use.

[0003] Among them, the velocity - area method is a traditional and widely used flow measurement method, which mainly calculates the flow rate by measuring the flow velocity and the cross - sectional area of the water flow. However, this method requires arranging multiple measuring points within the measurement section, and accurate flow velocity data needs to be collected at each measuring point, and the final flow rate result is obtained through complex calculations. This not only increases the work complexity, but also the measurement result is easily affected by factors such as water flow turbulence, impurities, and uneven distribution of measuring points, thus affecting the measurement accuracy.

[0004] The ultrasonic flowmeter is a relatively advanced non - contact measurement technology that uses the change in the propagation time of ultrasonic signals in the water flow to calculate the flow rate. This technology is applicable to different water body environments and has high sensitivity and response speed. However, it has high linear requirements for the installation environment and needs to ensure stable water flow and uniform flow velocity at the measurement position. In addition, air bubbles or suspended particles in the water may interfere with the propagation of ultrasonic signals, resulting in data errors.

[0005] The electromagnetic flowmeter, as another high - precision flow measurement instrument, can determine the flow rate by measuring the voltage change when a conductive liquid flows through a magnetic field. Although this technology shows excellent stability and accuracy in closed - pipe measurements, its equipment cost is high, and water shutdown operations are usually required during installation and maintenance, increasing the operation difficulty and cost.

[0006] In summary, there is an urgent need for a flow measurement device that is convenient for flow measurement, has accurate measurement results, and low cost. Summary of the Invention

[0007] To solve one of the above - mentioned technical defects, the present application provides a rectangular open channel water flow weighing device, an automatic flow measurement device, and a flow measurement method.

[0008] According to the first aspect of the present application, a rectangular open channel water flow weighing device is provided, which is installed in a preset installation groove at the bottom of the rectangular open channel. The installation groove is arranged along the width direction of the rectangular open channel. The water flow weighing device includes:

[0009] Installation base, arranged at the bottom of the installation groove;

[0010] At least one weighing sensor, each weighing sensor includes a housing and a sensor body arranged inside the housing, and the bottom of one end of the housing is connected to the top of the installation base;

[0011] Weighing plate, arranged along the width direction of the rectangular open channel, and the length of the weighing plate is the same as the width of the rectangular open channel; the position of the weighing plate in the vertical direction is the weighing area;

[0012] Force transmission column, the top end is connected to the weighing plate, and the bottom end extends into the housing and is connected to the input end of the sensor body; the weighing plate and the housing are arranged at intervals in the vertical direction;

[0013] Signal conversion module, its input end is electrically connected to the output end of the sensor body, and converts the pressure signal sensed by the weighing sensor into a weight signal;

[0014] Digital display, the input end of the digital display is electrically connected to the output end of the signal conversion module.

[0015] Preferably, an inverted conical through hole for the force transmission column to extend into is arranged at the top of the housing.

[0016] Preferably, the surface of the installation groove is paved with an aluminum alloy layer, and an anti-slip pad is arranged at the bottom of the installation groove.

[0017] Preferably, the weighing sensor is a cantilever beam weighing sensor, and the cantilever beam weighing sensor includes:

[0018] Cantilever beam, including a fixed end and a free end, the fixed end is connected to the inside of the housing, and the free end is close to the end of the force transmission column far from the weighing plate;

[0019] Wheatstone bridge circuit, including four strain gauges pasted on the cantilever beam, and the four strain gauges are connected by wires to construct a Wheatstone bridge circuit. The input end of the Wheatstone bridge circuit is connected to the excitation power supply, and the output end of the Wheatstone bridge circuit is connected to the input end of the signal conversion module.

[0020] More preferably, the signal conversion module includes an amplifier, a filter and an A / D converter that are electrically connected in sequence;

[0021] Taking the input end of the amplifier as the input end of the signal conversion module, and the output end of the analog-to-digital converter as the output end of the signal conversion module;

[0022] The output end of the Wheatstone bridge circuit is electrically connected to the input end of the amplifier, and the output end of the analog-to-digital converter is electrically connected to the input end of the digital display.

[0023] More preferably, the signal conversion module and the digital display are both arranged on the top of the rectangular open channel.

[0024] According to the second aspect of the present application, a weighing type rectangular open channel automatic flow measurement device is provided, including: a water flow weighing device and a host computer, and the water flow weighing device is the water flow weighing device described in any one of the above;

[0025] The input end of the host computer is electrically connected to the output end of the digital display instrument, and the host computer receives the weight signal in the digital display instrument and processes it into flow data.

[0026] According to the third aspect of the present application, a flow measurement method for a weighing type rectangular open channel automatic flow measurement device is provided, including the following steps:

[0027] S10, preset the installation groove:

[0028] Set a pit adapted to the water flow weighing device as the installation groove in the measurement area of the rectangular open channel;

[0029] Lay an aluminum alloy layer on the surface of the installation groove, and set an anti-slip pad at the bottom of the installation groove;

[0030] S20, install the water flow weighing device in the installation groove;

[0031] S30, electrically connect the input end of the host computer to the output end of the digital display instrument;

[0032] S40, construct a flow-weight mapping formula through the host computer:

[0033] Inject sample water flow into the measurement area of the rectangular open channel according to the preset sample water flow data;

[0034] After the sample water flow is stable for 1-2 minutes, collect the sample weight data, specifically including:

[0035] The sample water body gives a force to the weighing plate, and this force is transmitted to the sensor body through the force transmission column;

[0036] Convert the pressure signal sensed by the sensor body into a weight signal through the signal conversion module, and display it through the digital display instrument to obtain the sample water flow weight data;

[0037] Calculate the total sample water flow weight data in the rectangular open channel based on the sample water flow weight data according to the proportion of the weighing area in the rectangular open channel;

[0038] Perform the above operations in a loop according to the next preset sample water flow data until the preset number of sample water flow data and the corresponding total sample water flow weight data are obtained;

[0039] Input all the sample water flow data and the corresponding total sample water flow weight data into the host computer, and fit the flow-weight mapping formula through the host computer;

[0040] S50, perform automatic flow measurement through the constructed flow-weight mapping formula:

[0041] Collect the current water flow weight data through the water flow weighing device;

[0042] Based on the proportion of the weighing area in the rectangular open channel, calculate the total current water flow weight data in the rectangular open channel based on the current water flow weight data;

[0043] Input the current total water flow weight data into the flow-weight mapping formula in the upper computer, and process the current total water flow weight data into the current water flow rate data.

[0044] Preferably, for S20, install the water flow weighing device in the installation groove, specifically including:

[0045] Set the installation base in the installation groove through at least one first bolt assembly, and leave a gap of 0.5 - 1 cm between the installation base and the bottom of the installation groove;

[0046] Set the weighing sensor above the installation base through at least one second bolt assembly;

[0047] Set a force transmission column on the top of the end of the weighing sensor away from the installation base, and the bottom end of the force transmission column extends into the housing and is connected to the input end of the sensor body;

[0048] Set a weighing plate at the top end of the force transmission column;

[0049] Electrically connect the output end of the sensor body to the input end of the signal conversion module, and electrically connect the output end of the signal conversion module to the input end of the digital display.

[0050] The beneficial effects of this application are as follows:

[0051] The water flow weighing device provided in this application has a simple structure, is convenient for installation and maintenance, and has a low equipment cost. The weighing sensor is set at the bottom of the rectangular open channel, in direct contact with the water flow, and can detect the water flow weight in the rectangular open channel in real time, with high detection efficiency, can adapt to complex water flow environments, and the detection results are accurate. Among them, the weighing sensor is stably set in the installation groove through the installation base. When the water flow passes above the weighing sensor, the pressure borne by the weighing plate is transmitted to the input end of the sensor body through the force transmission column, and then the sensor body outputs the sensed pressure signal. The signal conversion unit can convert this pressure signal into a weight signal and output it through the digital display.

[0052] Other features and advantages of the present application will be described in the subsequent specification, and partly will become apparent from the specification, or will be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained by the content pointed out in the written specification and the drawings. Description of the Drawings

[0053] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0054] Figure 1 is a schematic structural diagram of a rectangular open channel and an installation groove provided by the present application;

[0055] Figure 2 is a schematic structural diagram of a weighing area provided by the present application;

[0056] Figure 3 is a schematic structural diagram of a water flow weighing device provided by the present application;

[0057] Figure 4 is a cross-sectional view of a water flow weighing device provided by the present application;

[0058] In the figure:

[0059] 1 is an installation base, 2 is a weighing sensor, 21 is a housing, 211 is an inverted conical through hole, 3 is a weighing plate, 4 is a force transmission column, 6 is a digital display, 7 is a first bolt assembly, 8 is a second bolt assembly, 110 is a rectangular open channel, 120 is an installation groove, and 130 is a weighing area. Detailed Description of the Embodiments

[0060] In order to make the technical solutions and advantages in the embodiments of the present application clearer, the following further describes the exemplary embodiments of the present application in detail with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0061] As Figures 1 to 4 shown, Figure 2 in which A is the water flow direction. In response to the above problems, an embodiment of the present application provides a rectangular open channel water flow weighing device, which is installed in an installation groove 120 preset at the bottom of the rectangular open channel 110. The bottom of the installation groove is set flat. The installation groove 120 is arranged along the width direction of the rectangular open channel. An aluminum alloy layer is laid on the surface of the installation groove 120. The aluminum alloy layer is detachably connected to the surface of the installation groove. A rubber anti-slip pad is arranged at the bottom of the installation groove 120. The settings of the aluminum alloy layer and the rubber anti-slip pad provide a stable support environment for the installation of the water flow weighing device.

[0062] Furthermore, the water flow weighing device includes:

[0063] An installation base 1, which is arranged at the bottom of the installation groove 120;

[0064] At least one weighing sensor 2, each weighing sensor includes a housing 21 and a sensor body arranged inside the housing 21, and the bottom of one end of the housing 21 is connected to the top of the installation base 1; specifically, the weighing plane of the weighing sensor 2 is parallel to the bottom of the rectangular open channel; in the actual application process, when the number of weighing sensors 2 is multiple, the obtained water flow weight data is the sum of the weights sensed by multiple weighing sensors;

[0065] A weighing plate 3, which is arranged along the width direction of the rectangular open channel 110, and the length of the weighing plate 3 is the same as the width of the rectangular open channel; the position of the weighing plate 3 in the vertical direction is the weighing area 130;

[0066] A force transmission column 4, the top of which is connected to the weighing plate 3, and an inverted conical through hole 211 for the force transmission column 4 to extend into is arranged at the top of the housing 21. The arrangement of the inverted conical through hole facilitates the installation of the force transmission column, so that the bottom end of the force transmission column 4 can smoothly extend into the housing 21 through the inverted conical through hole and then be connected to the input end of the sensor body; the weighing plate 3 and the housing 21 are spaced apart in the vertical direction;

[0067] A signal conversion module, the input end of which is electrically connected to the output end of the sensor body, and converts the pressure signal sensed by the weighing sensor 2 into a weight signal. This pressure signal is an analog signal and the weight signal is a digital signal; specifically, the output end of the sensor body is connected to the input end of the signal conversion module through a shielded cable, which can avoid noise interference;

[0068] A digital display 6, the input end of the digital display 6 is electrically connected to the output end of the signal conversion module.

[0069] The water flow weighing device provided in this application has a simple structure, is convenient for installation and maintenance, and has a low equipment cost. The weighing sensor is arranged at the bottom of the rectangular open channel and is in direct contact with the water flow, which can detect the weight of the water flow in the rectangular open channel in real time, has a high detection efficiency, can adapt to complex water flow environments, and the detection results are accurate. Among them, the weighing sensor is stably arranged in the installation groove through the installation base. When the water flow passes above the weighing sensor, the pressure borne by the weighing plate is transmitted to the input end of the sensor body through the force transmission column. Then, the sensor body outputs the sensed pressure signal, and the signal conversion unit can convert this pressure signal into a weight signal and output it through the digital display.

[0070] Specifically, a waterproof and anti-corrosion coating is provided on the exterior of the housing, enabling it to adapt to the environment of long-term underwater operation; a bellows is disposed around the exterior of the sensor body, which can waterproof the sensor body, and an anti-interference device can also be provided on the exterior of the sensor body to ensure the stability of the sensor body during long-term operation in water and extend its service life.

[0071] In practical applications, the selection of the weighing sensor can be flexibly determined according to factors such as actual measurement accuracy, installation method, and water body characteristics.

[0072] Specifically, the weighing sensor can be a resistive weighing sensor, a capacitive weighing sensor, a piezoelectric weighing sensor, an electromagnetic weighing sensor, an optical fiber weighing sensor, etc. Any weighing sensor in the prior art can be selected.

[0073] Specifically, the resistive weighing sensor can have structures such as a cantilever beam type, an S type, a column type, etc. As a specific implementation method, the resistive weighing sensor can be a cantilever beam weighing sensor, and the cantilever beam weighing sensor includes:

[0074] A cantilever beam, including a fixed end and a free end, the fixed end is connected to the interior of the housing, and the free end is close to one end of the force transmission column 4 away from the weighing plate 3; specifically, the cantilever beam is an elastic metal;

[0075] A Wheatstone bridge circuit, including four strain gauges pasted on the cantilever beam, and the four strain gauges are connected by wires to construct a Wheatstone bridge circuit. The input end of the Wheatstone bridge circuit is connected to an excitation power supply, and the output end of the Wheatstone bridge circuit is connected to the input end of the signal conversion module. Specifically, the strain gauge is a sensitive element supported by the characteristic that the resistance changes with stretching or compression, and is composed of resistance wire or metal foil.

[0076] The weighing sensor in this application has high sensitivity. Through the cantilever beam type weight sensor, the minute pressure changes of the water flow can be captured in real time, making the subsequent converted water flow weight data more accurate. At the same time, it also has the capabilities of anti-vibration and anti-impact, and can be applied to the weight measurement in complex water flow environments. Among them, after the cantilever beam is subjected to the pressure transmitted by the weighing plate and the force transmission column, it undergoes elastic deformation, resulting in a change in the resistance of the strain gauge. The Wheatstone bridge circuit converts the resistance change of the strain gauge into a change in the electrical signal. The intensity of the electrical signal is proportional to the magnitude of the force on the cantilever beam, thus accurately reflecting the weight of the water flow. The Wheatstone bridge circuit has high sensitivity and anti-interference ability.

[0077] Furthermore, the signal conversion module includes an amplifier, a filter and an analog-to-digital converter (24-bit Delta-Sigma A / D converter) which are electrically connected in sequence; the amplifier can amplify weak pressure signals, the filter can filter noise and interference, and the A / D converter can convert pressure signals into weight signals, which need to be calibrated by weight calibration or weight-free calibration before use to ensure the accuracy of the conversion results;

[0078] The input end of the amplifier is used as the input end of the signal conversion module, and the output end of the analog-to-digital converter is used as the output end of the signal conversion module;

[0079] The output end of the Wheatstone bridge circuit is electrically connected to the input end of the amplifier, and the output end of the analog-to-digital converter is electrically connected to the input end of the digital display 6 .

[0080] Furthermore, the signal conversion module and the digital display 6 are both arranged on the top of the rectangular open channel 110 to avoid direct contact with the water flow, thereby increasing the service life and facilitating real-time observation of the collected data.

[0081] Specifically, the digital display can automatically eliminate abnormal data and save normal data while displaying the weight signal in real time.

[0082] The present application also provides a weighing type rectangular open channel automatic flow measurement device, comprising: a water flow weighing device and a host computer, wherein the water flow weighing device is a water flow weighing device as described in any one of the above items;

[0083] The input end of the host computer is electrically connected to the output end of the digital display 6 , and the host computer receives the weight signal from the digital display 6 and processes it into flow data.

[0084] The automatic flow measuring device provided in the present application breaks the traditional flow measuring method and pioneered the method of using weight and flow conversion. It can conveniently process the weight signal into flow data, solving the problems in the prior art that flow measurement requires the deployment of multiple measuring points, complex calculations, and is easily interfered by external factors. It has high sensitivity and fast response speed, and can achieve real-time measurement.

[0085] The electrical connection mentioned in this application can be a wired electrical connection, a wireless connection, or a dual-mode electrical connection (including wired and wireless) to facilitate data transmission and make it more convenient. Among them, the wired electrical connection uses a shielded cable, and the shielded cable is waterproof and sealed. A PVC pipe is set on the outer wall of the shielded cable and then buried to prevent electromagnetic interference and achieve better data transmission effect.

[0086] The present application also provides a flow measurement method of a weighing-type rectangular open channel automatic flow measurement device, comprising the following steps:

[0087] S10, Preset installation groove 120:

[0088] In the water area to be measured of the rectangular open channel 110, a pit adapted to the water flow weighing device is set as the installation groove 120; the size of the installation groove is adapted to the structure of the water flow weighing device, so that the water flow weighing device can be exactly arranged in the installation groove while minimizing the disturbance to the water flow and avoiding large eddies in the pit, making the measurement result more accurate; the bottom of the installation groove is set flat to facilitate the subsequent installation and stable measurement of the water flow weighing device;

[0089] Lay an aluminum alloy layer on the surface of the installation groove 120 and set an anti-slip pad at the bottom of the installation groove 120;

[0090] S20, Install the water flow weighing device in the installation groove 120;

[0091] S30, The input end of the upper computer is electrically connected to the output end of the digital display 6;

[0092] S40, Construct a flow-weight mapping formula through the upper computer:

[0093] Inject sample water flow into the water area to be measured of the rectangular open channel according to the preset sample water flow rate data;

[0094] After the sample water flow is stable for 1 - 2 minutes, collect the sample weight data, specifically including:

[0095] The sample water body gives a force to the weighing plate 3, and this force is transmitted to the sensor body through the force transmission column 4;

[0096] Convert the pressure signal sensed by the sensor body into a weight signal through the signal conversion module and display it through the digital display 6 to obtain the sample water flow weight data;

[0097] According to the proportion of the weighing area 130 in the rectangular open channel 110, calculate the total weight data of the sample water flow in the rectangular open channel based on the sample water flow weight data; since the position corresponding to the weighing plate 3 in the vertical direction is used as the weighing area 130, and the length of the weighing plate 3 is the same as the width of the rectangular open channel, therefore, calculate the ratio of the length of the rectangular open channel to the width of the weighing plate 3 to obtain the total weight data of the sample water flow in the rectangular open channel, that is: Total weight data of sample water flow = (Length of rectangular open channel / Width of weighing plate) × Sample water flow weight data;

[0098] Perform the above operations in a cycle according to the next preset sample water flow rate data until the preset number of sample water flow rate data and the corresponding total weight data of the sample water flow are obtained;

[0099] All sample water flow data and the corresponding sample water flow total weight data are input into the host computer, and the flow weight mapping formula is fitted by the host computer; the least square method is used for linear or nonlinear regression fitting during fitting;

[0100] In this application, when the sample water flow rate is controllable, the corresponding sample water flow weight can be measured to facilitate the fitting of the flow weight mapping formula; in practical applications, the preset sample water flow data range can be 10L / s to 100L / s. At least ten sets of sample water flow weight data need to be obtained for each sample water flow data, and the average value is calculated to ensure the accuracy of the flow weight mapping formula.

[0101] S50, automatically measures flow through the constructed flow weight mapping formula:

[0102] After the rectangular open channel is put into use, the current water flow weight data is collected through the water flow weighing device;

[0103] According to the proportion of the weighing area 130 to the rectangular open channel 110, the total weight data of the current water flow in the rectangular open channel is calculated based on the current water flow weight data; as above, the total weight data of the current water flow = (the length of the rectangular open channel / the width of the weighing plate) × the current water flow weight data;

[0104] The current total water flow weight data is input into the flow weight mapping formula in the host computer, and the current total water flow weight data is processed into the current water flow data.

[0105] The flow measurement method of the automatic flow measuring device provided in the present application is the first to adopt a method of converting weight and flow, and calculates the water flow by measuring the weight. The operation is simple, and it solves the problems in the prior art of needing to deploy multiple measuring points, complex calculations, and easy interference by external factors. It also has high sensitivity and fast response speed, and can realize real-time measurement.

[0106] Further, S20, installing a water flow weighing device in the installation tank 120, specifically including:

[0107] The mounting base 1 is set in the mounting groove 120 by at least one first bolt assembly 7, and a gap of 0.5 to 1 cm is left between the mounting base 1 and the bottom of the mounting groove 120; the gap between the mounting base and the bottom of the mounting groove can avoid the impact interference of water flow, and is more stable and safe;

[0108] The weighing sensor 2 is arranged above the mounting base 1 by at least one second bolt assembly 8;

[0109] A force transmission column 4 is arranged on the top of one end of the weighing sensor 2 away from the mounting base 1, and the bottom end of the force transmission column 4 extends into the housing 21 and is connected to the input end of the sensor body;

[0110] A weighing plate 3 is provided at the top of the force transmission column 4;

[0111] The output end of the sensor body is electrically connected to the input end of the signal conversion module, and the output end of the signal conversion module is electrically connected to the input end of the digital display 6.

[0112] Working principle:

[0113] When the rectangular open channel 110 is put into use, when the water flow in the rectangular open channel 110 passes through the weighing area 130, the weighing plate 3 is in direct contact with the water flow, and the water flow gives the weighing plate 3 a downward pressure. The weighing plate 3 transmits the pressure to the input end of the sensor body through the force transmission column 4 ( Figure 4 the B direction in is the pressure transmission direction), the cantilever beam in the sensor body undergoes elastic deformation, and strain gauges at different positions will record the specific situation of the deformation of the cantilever beam, thereby indirectly reflecting the magnitude of the force received by the cantilever beam. The Wheatstone bridge circuit converts the resistance change of the strain gauge into a change in the electrical signal, and then transmits the pressure signal to the signal conversion module. The pressure signal is converted into a weight signal after passing through the amplifier, filter and A / D converter in the signal conversion module in sequence. The weight signal is output and saved by the digital display, and the total current water flow data is calculated by the upper computer, and then the current water flow data is calculated through the flow-weight mapping formula.

[0114] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0115] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0116] In this application, unless otherwise clearly stipulated and defined, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or capable of communicating with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0117] Although the preferred embodiments of this application have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0118] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.

Claims

1. A rectangular open channel flow weighing device is installed in a preset installation groove (120) at the bottom of a rectangular open channel (110), and the installation groove (120) is arranged along the width direction of the rectangular open channel. It is characterized in that, The water flow weighing device includes: An installation base (1), which is arranged at the bottom of the installation groove (120); At least one weighing sensor (2), each weighing sensor includes a housing (21) and a sensor body arranged inside the housing (21), and the bottom of one end of the housing (21) is connected to the top of the installation base (1); A weighing plate (3), which is arranged along the width direction of the rectangular open channel (110), and the length of the weighing plate (3) is the same as the width of the rectangular open channel; the position of the weighing plate (3) in the vertical direction is the weighing area (130); A force transmission column (4), the top end of which is connected to the weighing plate (3), and the bottom end extends into the housing (21) and is connected to the input end of the sensor body; the weighing plate (3) and the housing (21) are arranged at intervals in the vertical direction; A signal conversion module, the input end of which is electrically connected to the output end of the sensor body, and converts the pressure signal sensed by the weighing sensor (2) into a weight signal; A digital display (6), the input end of the digital display (6) is electrically connected to the output end of the signal conversion module.

2. The rectangular open-channel flow weighing device according to claim 1, wherein A reverse conical through hole (211) for the force transmission column (4) to extend into is arranged at the top of the housing (21).

3. The rectangular open channel flow weighing device according to claim 1, characterized in that, An aluminum alloy layer is laid on the surface of the installation groove (120), and an anti-slip pad is arranged at the bottom of the installation groove (120).

4. The rectangular open-channel flow weighing device according to claim 1, characterized in that The weighing sensor is a cantilever beam weighing sensor, and the cantilever beam weighing sensor includes: A cantilever beam, which includes a fixed end and a free end, the fixed end is connected to the inside of the housing, and the free end is close to one end of the force transmission column (4) far from the weighing plate (3); A Wheatstone bridge circuit, which includes four strain gauges pasted on the cantilever beam, and the four strain gauges are connected by wires to construct a Wheatstone bridge circuit. The input end of the Wheatstone bridge circuit is connected to an excitation power supply, and the output end of the Wheatstone bridge circuit is connected to the input end of the signal conversion module.

5. The rectangular open channel flow weighing device according to claim 4, characterized in that, The signal conversion module includes an amplifier, a filter and an A / D converter that are electrically connected in sequence; Taking the input end of the amplifier as the input end of the signal conversion module, and the output end of the analog-to-digital converter as the output end of the signal conversion module; The output end of the Wheatstone bridge circuit is electrically connected to the input end of the amplifier, and the output end of the analog-to-digital converter is electrically connected to the input end of the digital display (6).

6. The rectangular open channel flow weighing device according to claim 5, characterized in that, The signal conversion module and the digital display (6) are both arranged on the top of the rectangular open channel (110).

7. An automatic flow measurement device for a weighing type rectangular open channel, characterized in that, Including: A water flow weighing device and a host computer, and the water flow weighing device is the water flow weighing device described in any one of claims 1 to 6; The input end of the host computer is electrically connected to the output end of the digital display (6), and the host computer receives the weight signal in the digital display (6) and processes it into flow data.

8. The flow measurement method of the weighing type rectangular open channel automatic flow measurement device according to claim 7, characterized in that, Including the following steps: S10, preset the installation groove (120): Set a pit adapted to the water flow weighing device as the installation groove (120) in the measurement area of the rectangular open channel (110); Lay an aluminum alloy layer on the surface of the installation groove (120), and set an anti-slip pad at the bottom of the installation groove (120); S20, install the water flow weighing device in the installation groove (120); S30, electrically connect the input end of the host computer to the output end of the digital display (6); S40, construct a flow-weight mapping formula through the host computer: Inject sample water into the basin to be measured in the rectangular open channel according to the preset sample water flow rate data; After the sample water flow is stable for 1 - 2 minutes, collect the sample weight data, specifically including: The sample water body exerts a force on the weighing plate (3), and this force is transmitted to the sensor body through the force - transmitting column (4); Convert the pressure signal sensed by the sensor body into a weight signal through the signal conversion module, and display it through the digital display (6) to obtain the sample water flow weight data; Based on the proportion of the weighing area (130) in the rectangular open channel, calculate the total weight data of the sample water flow in the rectangular open channel based on the sample water flow weight data; Perform the above operations cyclically according to the next preset sample water flow rate data until the preset number of sample water flow rate data and the corresponding total weight data of the sample water flow are obtained; Input all the sample water flow rate data and the corresponding total weight data of the sample water flow into the upper computer, and fit the flow - weight mapping formula through the upper computer; S50, perform automatic flow measurement through the constructed flow - weight mapping formula: Collect the current water flow weight data through the water flow weighing device; Based on the proportion of the weighing area (130) in the rectangular open channel, calculate the total weight data of the current water flow in the rectangular open channel based on the current water flow weight data; Input the total weight data of the current water flow into the flow - weight mapping formula in the upper computer, and process the total weight data of the current water flow into the current water flow rate data.

9. The flow measurement method of the weighing type rectangular open channel automatic flow measurement device according to claim 8, characterized in that, S20, install the water flow weighing device in the installation groove (120), specifically including: Set the installation base (1) in the installation groove (120) through at least one first bolt assembly (7), and leave a gap of 0.5 - 1 cm between the installation base (1) and the bottom of the installation groove (120); Set the weighing sensor (2) above the installation base (1) through at least one second bolt assembly (8); Set a force - transmitting column (4) at the top of the end of the weighing sensor (2) far from the installation base (1), and the bottom end of the force - transmitting column (4) extends into the housing (21) and is connected to the input end of the sensor body; Set the weighing plate (3) at the top end of the force - transmitting column (4); Electrically connect the output end of the sensor body to the input end of the signal conversion module, and electrically connect the output end of the signal conversion module to the input end of the digital display (6).

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