Automatic open channel flow measuring device, system and method for underground coal mine

Abstract

The invention relates to the technical field of open channel flow measurement, and discloses an automatic open channel flow measurement device, system and method for an underground coal mine. A proper measurement position is selected, a fixing support is installed, and then the measurement device is installed over an open channel through the fixing support; the flow of the open channel can be measured in real time by setting parameters of the installation height and the width of the open channel, the measuring device is wirelessly connected with a mining intrinsic safety type handheld terminal through Bluetooth to achieve setting of equipment and parameters of the open channel, and then the measuring device is connected with upper-level receiving equipment through an RS485 module to achieve automatic uploading of data. According to the measuring device, automatic measurement and data processing in the whole process are achieved, and manual intervention is not needed. The device can automatically collect flow data, automatic uploading and wireless communication of the data are achieved through the RS485 interface and the Bluetooth module, the monitoring efficiency and real-time performance are improved, the labor intensity of coal mine workers is relieved, and the intelligent level of coal mine water regimen monitoring is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of open channel flow measurement, and in particular to an open channel flow automatic measurement device, system and method for underground coal mines. Background Art

[0002] The coal mining industry is a high-risk working environment, in which groundwater conditions are one of the main hidden dangers affecting coal mine safety production. Open channels play an important role in drainage and ventilation in coal mines, and the monitoring of their water flow conditions plays an important role in preventing flood accidents and ensuring mine safety production. With the widespread application of intelligent technology in the coal mining industry, companies have an increasing demand for real-time monitoring and data collection. Through underground open channel flow monitoring technology, water data can be automatically collected and monitored in real time, which not only improves the level of intelligence in mine management, but also provides reliable technical support for coal mine water control.

[0003] The continuous progress of sensor technology and Internet of Things technology has also brought significant improvements to underground open channel flow monitoring technology. Modern monitoring equipment and data processing systems can efficiently manage and analyze open channel flow data, which is of great significance for real-time monitoring of coal mine water conditions and prevention of flood accidents.

[0004] However, real-time monitoring of open channel flow in coal mines faces technical challenges. Traditional monitoring methods, such as the buoy method and the volumetric method, are simple and easy to use, but they require manual operation, have low monitoring frequency, and lack timely data collection. Modern monitoring methods, such as the use of standard weirs such as Parshall weirs, rectangular weirs, and triangular weirs, can calculate open channel flow through empirical formulas, but the production cost of standard weirs is high, and different sizes of open channels require the production of weirs of corresponding sizes. There are disadvantages such as high and cumbersome installation requirements and low measurement accuracy. Summary of the invention

[0005] In order to solve the problems of the prior art that the monitoring frequency is low and the data collection is not timely due to reliance on manual operation, and the standard weir flume has high production cost and complicated manufacturing, the present invention provides an automatic open channel flow measurement device, system and method for underground coal mines with high collection accuracy, simple installation, high degree of automation and high monitoring efficiency.

[0006] The technical contents of the present invention are as follows:

[0007] One aspect of the present invention provides an automatic open channel flow measuring device for underground coal mines, comprising a shell, a bottom cover arranged on one side of the shell and a probe mounting plate arranged on the other side of the shell, wherein an ultrasonic probe, a radar, a liquid crystal screen and a main board are arranged inside the shell, wherein the ultrasonic probe is fixed on the inner wall of the probe mounting plate, the main board is connected to the radar and the ultrasonic probe via a wire, and a connector is arranged on one end of the shell.

[0008] Furthermore, a group of mounting parts, a lampshade and a transparent window are arranged on the bottom cover, the mounting parts are located between the lampshade and the transparent window, the transparent window is embedded on the bottom cover, and the liquid crystal screen is fixed on the inner wall of the transparent window.

[0009] Furthermore, a side of the shell close to the radar is configured as a radar cover.

[0010] Another aspect of the present invention provides an open channel flow automatic measurement system for underground coal mines, comprising any of the above-mentioned measuring devices, data receiving equipment and a mine-used intrinsically safe handheld terminal, wherein the measuring device is connected to the data receiving equipment via a connector, the measuring device is wirelessly connected to the mine-used intrinsically safe handheld terminal, and the measuring device further comprises:

[0011] MCU module, used for logic control and data calculation processing;

[0012] Radar module, used to output target speed information;

[0013] Ultrasonic module, used for ultrasonic distance measurement;

[0014] Light alarm module, used for alarm flashing;

[0015] Display module, used for equipment information and real-time data display;

[0016] RS485 module, used for data communication with the upper level data receiving device or data receiving server;

[0017] Storage module, used for storing historical data;

[0018] Bluetooth module, used for wireless communication and setting measurement device parameters;

[0019] Power module, used to provide stable power supply and protect power supply;

[0020] The ultrasonic module is located on the ultrasonic probe of the measuring device, the radar module is located on the radar of the measuring device, and the MCU module, light alarm module, display module, RS485 module, storage module, Bluetooth module and power module are all arranged on the main board.

[0021] Furthermore, the MCU module is connected to the ultrasonic module and the radar module through the UART interface for data interaction, the MCU module is connected to the RS485 module through the UART interface for communication interaction, the MCU module is connected to the data receiving device through the RS485 module, the MCU module is connected to the Bluetooth module through the UART interface for Bluetooth wireless communication, and the MCU module is connected to the mining intrinsically safe handheld terminal through the Bluetooth module.

[0022] Furthermore, the MCU module is connected to the light alarm module through the IO interface to flash the alarm, and the MCU module is connected to the display module and the storage module through the SPI interface to display on the LCD screen and store and read data.

[0023] Another aspect of the present invention also provides a method for automatically measuring flow in an open channel in a coal mine, comprising the following steps:

[0024] S1: Install fixed brackets on both sides of the open channel and set the fixed brackets parallel to the open channel;

[0025] S2: Use screws to install the measuring device on the fixed bracket through a set of mounting parts on the measuring device, and adjust the fixed bracket until the measuring device is located in the center of the open channel and vertical to the open channel;

[0026] S3: Use a ruler to measure parameters: installation height H and channel width D;

[0027] S4: After powering the measuring device, use the mining intrinsically safe handheld terminal to connect to the measuring device via Bluetooth, and set the installation height H and channel width D through the terminal;

[0028] S5: After completing step S4, the measuring device can automatically measure the open channel flow rate and display the open channel flow rate data on the LCD screen of the measuring device.

[0029] Furthermore, the step S5 comprises:

[0030] The ultrasonic module calculates the distance of the target to be measured from the ultrasonic module according to the ultrasonic signal sending and receiving time, that is, the air height L;

[0031] The radar module calculates the moving speed q of the target according to the frequency change of the transmitted signal;

[0032] The MCU module calculates the water level value h according to the difference between the installation height H and the empty height L, and then calculates the cross-sectional area S of the open channel water body according to the product of the channel width D and the water level value h;

[0033] The MCU module then calculates the open channel flow rate Q based on the product of the moving speed q and the cross-sectional area S.

[0034] Finally, the MCU module controls the display module through the SPI interface to display the open channel flow Q on the LCD screen.

[0035] Furthermore, it also includes step S6: when the measuring device is connected to the intrinsically safe handheld terminal for mining through the Bluetooth module, the setting information sent by the intrinsically safe handheld terminal for mining is received, and finally the MCU module transfers it to the storage module for storage, and the stored data includes setting parameters and flow data.

[0036] Furthermore, it also includes step S7: when the measuring device receives an instruction sent by the upper-level device, i.e., the data receiving device, through the RS485 module, the MCU module extracts the flow data from the storage module and sends it to the RS485 module, and the RS485 module sends the flow data to the upper-level device, thereby completing the upload of the open channel flow data.

[0037] The beneficial effects of the present invention include at least:

[0038] (1) Compared with traditional manual monitoring methods such as the buoy method and the volumetric method, the measuring device of the present invention uses ultrasonic and radar technology, and its measurement accuracy is much higher than that of manual measurement. It can achieve high-precision flow measurement and more accurately reflect the real-time changes of open channel flow;

[0039] (2) Compared with modern monitoring methods using standard weirs such as Parshall weirs, rectangular weirs, and triangular weirs, the measurement device of the present invention is simple and quick to install. It only requires installing fixed brackets on both sides of the open channel, fixing the measurement device on the brackets, and performing simple parameter settings before it can be put into use. There is no need to make and install complex weir structures, which greatly reduces the difficulty and cost of installation;

[0040] (3) The measuring device of the present invention realizes full-process automatic measurement and data processing without manual intervention. The device can automatically collect flow data and realize automatic data upload and wireless communication through RS485 interface and Bluetooth module, which improves the efficiency and real-time performance of monitoring, reduces the labor intensity of coal mine workers, and improves the intelligent level of coal mine water monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The present invention is a schematic structural diagram of an automatic open channel flow measurement device for underground coal mines.

[0042] Figure 2 The present invention is a schematic structural diagram of an automatic open channel flow measurement system for underground coal mines.

[0043] Figure 3 The present invention provides a schematic diagram of the principle of an MCU module of an automatic open channel flow measurement system for underground coal mines.

[0044] Figure 4 The present invention provides a schematic diagram of the 485 bus principle of an automatic open channel flow measurement system for underground coal mines.

[0045] Figure 5 A schematic diagram of the principle of a Bluetooth module of an automatic open channel flow measurement system for underground coal mines provided by the present invention.

[0046] Figure 6A Flash principle schematic diagram of an open channel flow automatic measurement system for underground coal mines provided by the present invention.

[0047] Figure 7 A schematic diagram of the principle of a power supply module of an automatic open channel flow measurement system for underground coal mines provided by the present invention.

[0048] Figure 8 The present invention provides a schematic diagram of the principle of an ultrasonic module of an automatic open channel flow measurement system for underground coal mines.

[0049] Among them: 1-shell; 2-bottom cover; 3-probe mounting plate; 4-ultrasonic probe; 5-radar cover; 6-radar; 7-LCD screen; 8-mainboard; 9-connector; 10-transparent window; 11-mounting piece; 12-lamp cover. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Combination Figure 1 As shown, one aspect of the present invention provides an automatic open channel flow measuring device for underground coal mines, comprising a shell 1, a bottom cover 2 arranged on one side of the shell 1 and a probe mounting plate 3 arranged on the other side of the shell 1, wherein an ultrasonic probe 4, a radar 6, a liquid crystal screen 7 and a main board 8 are arranged inside the shell 1, wherein the ultrasonic probe 4 is fixed to the inner wall of the probe mounting plate 3, wherein the main board 8 is connected to the radar 6 and the ultrasonic probe 4 through a wire, wherein a connector 9 is arranged on one end of the shell 1, wherein the connector 9 penetrates into the shell 1 from the outside, and the measuring device is connected to other data receiving devices through the connector 9.

[0052] Furthermore, a group of mounting parts 11, a lampshade 12 and a transparent window 10 are provided on the bottom cover 2, the mounting part 11 is located between the lampshade 12 and the transparent window 10, the transparent window 10 is inlaid on the bottom cover 2, and the LCD screen 7 is fixed on the inner wall of the transparent window 10. Two mounting parts 11 are provided on the bottom cover 2, and the two mounting parts 11 are arranged side by side and in parallel on the bottom cover 2, and the measuring device is fixed above the open channel through the mounting parts 11.

[0053] Furthermore, a surface of the housing 1 close to the radar 6 is configured as a radar cover 5 .

[0054] The radar cover 5 can be made of high-strength, corrosion-resistant materials with a smooth surface and good wave-transmitting performance, which can effectively protect the radar module from the external environment and ensure the accurate transmission of radar signals. A sealing design is adopted between the cover 2 and the housing 1 to prevent moisture and dust from entering and improve the protection level of the device.

[0055] The transparent window 10 can be made of scratch-resistant glass with high light transmittance, and can clearly display the information on the LCD screen 7. The connection between the transparent window 10 and the bottom cover 2 can be made of waterproof sealing strips to ensure the safety and stability of the internal circuit.

[0056] The probe mounting plate 3 is designed with a precise positioning structure, which can firmly fix the ultrasonic probe 4 to ensure the stability and measurement accuracy of the probe. An interface for easy maintenance and replacement of the probe can also be reserved on the board to facilitate later maintenance work.

[0057] The measuring device of the present invention is suitable for various types of open channels in coal mines, such as rectangular open channels, trapezoidal open channels, circular open channels, etc. In rectangular open channels, the device can accurately measure the width and height of water flow and calculate the cross-sectional area and flow rate of the open channel; in trapezoidal open channels, the device measures the water level and channel width, combined with the geometric parameters of the trapezoidal open channel, to calculate the cross-sectional area and flow rate of the open channel; in circular open channels, the device can measure the diameter and speed of water flow and calculate the cross-sectional area and flow rate of the open channel. In different types of open channel applications, the measuring principles and methods of the device are basically the same, but corresponding parameter settings and adjustments need to be made according to the specific shape and size of the open channel.

[0058] The housing of the measuring device can be designed to be dustproof, and the internal circuits and modules are sealed inside the housing, which can effectively prevent the intrusion of dust in the underground environment of the coal mine and ensure the normal operation and service life of the device. At the same time, in view of the possible presence of corrosive gases or liquids in the underground environment of the coal mine, the housing and some key parts of the measuring device can be made of corrosion-resistant materials, which can effectively resist corrosion and extend the service life of the device.

[0059] Combination Figure 2 As shown, another aspect of the present invention provides an open channel flow automatic measurement system for underground coal mines, comprising any of the above-mentioned measuring devices, data receiving equipment and a mine-used intrinsically safe handheld terminal, wherein the measuring device is connected to the data receiving equipment via a connector, the measuring device is wirelessly connected to the mine-used intrinsically safe handheld terminal, and the measuring device further comprises:

[0060] MCU module, used for logic control and data calculation processing;

[0061] Radar module, used to output target speed information;

[0062] Ultrasonic module, used for ultrasonic distance measurement;

[0063] Light alarm module, used for alarm flashing;

[0064] Display module, used for equipment information and real-time data display;

[0065] RS485 module, used for data communication with the upper level data receiving device or data receiving server;

[0066] Storage module, used for storing historical data;

[0067] Bluetooth module, used for wireless communication and setting measurement device parameters;

[0068] Power module, used to provide stable power supply and protect power supply;

[0069] The ultrasonic module is located on the ultrasonic probe of the measuring device, the radar module is located on the radar of the measuring device, and the MCU module, light alarm module, display module, RS485 module, storage module, Bluetooth module and power module are all arranged on the main board.

[0070] Furthermore, the MCU module is connected to the ultrasonic module and the radar module through the UART interface for data interaction, the MCU module is connected to the RS485 module through the UART interface for communication interaction, the MCU module is connected to the data receiving device through the RS485 module, the MCU module is connected to the Bluetooth module through the UART interface for Bluetooth wireless communication, and the MCU module is connected to the mining intrinsically safe handheld terminal through the Bluetooth module.

[0071] Furthermore, the MCU module is connected to the light alarm module through the IO interface to flash the alarm, and the MCU module is connected to the display module and the storage module through the SPI interface to display on the LCD screen and store and read data.

[0072] The measuring device completes the equipment power supply and RS485 bus communication through a 4-core coal safety cable. Two cores of the 4-core coal safety cable are power supply lines (power positive and power negative), and two cores are RS485 bus communication lines (485A, 485B). The power supply line is connected to the mine intrinsically safe power supply, and the RS485 bus communication line can be connected to the upper-level data receiving device or data receiving server.

[0073] like Figure 3As shown, the MCU module selects the STM32 series microcontroller, the microcontroller model is: STM32F103RE, which is a 32-bit high-density performance microcontroller unit, providing 3 12-bit analog-to-digital converters, 4 general-purpose 16-bit timers, 3 SPIs, 1 SDIO, 5 USARTs, 1 USB and 1 CAN, with up to 64K bytes of SRAM and 512K flash memory. In terms of control logic, the MCU module first receives the data sent by the ultrasonic module and the radar module through the UART interface, and then processes and calculates the data according to the preset algorithm to obtain the open channel flow value. Then, the MCU module controls the display module through the SPI interface to display the flow data on the LCD screen, and transmits the data to the RS485 module and the Bluetooth module through the UART interface to realize data upload and wireless communication. During the whole process, the MCU module is also responsible for monitoring and managing the working status of each module to ensure the normal operation of the device.

[0074] In the data processing flow, after the MCU module receives the empty height L data sent by the ultrasonic module, it first calculates the water level value h = installation height H-empty height L, and then calculates the cross-sectional area S = hD of the open channel water body according to the set channel width D. Next, the MCU module receives the moving speed q data sent by the radar module, and finally calculates the open channel flow Q = Sq. During the entire data processing process, the MCU module will also filter and correct the data to improve the accuracy and stability of the measurement.

[0075] For the selection of RS485 module, the communication circuit chip model ADM2582 is selected. Figure 4 The 485 bus schematic shown is a fully integrated isolated data transceiver with ±15kV ESD protection, suitable for high-speed communication applications on multi-point transmission lines. The signal output part is a protection circuit composed of fuses, diodes, etc., which is used for data communication between the measuring device and the upper-level data receiving device or data receiving server.

[0076] The Bluetooth module uses the ZX-D30 Bluetooth chip. Figure 5 As shown, the design has an onboard antenna and an LED light-emitting diode on the periphery. The Bluetooth status can be determined by flashing, which is used for wireless communication and setting the parameters of the measuring device. The measuring device is connected to the mining intrinsically safe handheld terminal through Bluetooth wireless communication.

[0077] The storage module uses a storage circuit chip model: W25Q256JVFIQ, which has a flash memory capacity of 256M bits and supports the standard serial peripheral interface (SPI). The SPI clock frequency supports up to 133MHZ, and the transmission rate is better than the standard asynchronous 8-bit and 16-bit parallel flash memory. Figure 6 It is a Flash schematic diagram used for storing historical data.

[0078] like Figure 7 As shown, the power module mainly stabilizes the supply voltage to 5V and 3.3V for use by various modules. The power module includes a power supply voltage stabilization unit and a power supply protection unit. The DCDC5V voltage stabilization uses MP1584EN to stabilize the supply voltage to 5V; the LDO3.3V uses LM1117-3.3 to stabilize the 5V voltage to 3.3V. The front end of the DCDC5V circuit is designed with varistors, common-mode inductors, diodes, TVS tubes and other devices, which have a certain conditioning and protection effect on the input supply voltage. The back end of the DCDC5V circuit uses BT134W, which is combined with the voltage stabilizing diode to form a dual overvoltage protection circuit, which has a certain protection effect on the circuit. The power module uses the power protection chip model: LTC4380, which is used for power protection and providing stable power.

[0079] The ultrasonic module uses the ultrasonic distance measurement circuit chip model: RCWL-9622, which is used for ultrasonic distance measurement; Figure 8 The ultrasonic principle diagram is provided. The ultrasonic module is suitable for integrated transceiver ultrasonic ranging, which can complete the automatic measurement of the distance of the measured target.

[0080] The radar module uses the CL-08M radar circuit chip, which can directly output target speed information; the display module uses a 2.4-inch LCD screen to display device information and real-time data.

[0081] Another aspect of the present invention also provides a method for automatically measuring flow in an open channel in a coal mine, comprising the following steps:

[0082] S1: Install fixed brackets on both sides of the open channel and set the fixed brackets parallel to the open channel;

[0083] S2: Use screws to install the measuring device on the fixed bracket through a set of mounting parts on the measuring device, and adjust the fixed bracket until the measuring device is located in the center of the open channel and vertical to the open channel;

[0084] S3: Use a ruler to measure parameters: installation height H and channel width D;

[0085] S4: After powering the measuring device, use the mining intrinsically safe handheld terminal to connect to the measuring device via Bluetooth, and set the installation height H and channel width D through the terminal;

[0086] S5: After completing step S4, the measuring device can automatically measure the open channel flow rate and display the open channel flow rate data on the LCD screen of the measuring device.

[0087] Furthermore, the step S5 comprises:

[0088] The ultrasonic module uses the ultrasonic reflection principle to send out ultrasonic signals of a certain frequency through the ultrasonic transducer. When the ultrasonic signal encounters the target, it will be reflected. The ultrasonic transducer receives the reflected ultrasonic signal and calculates the distance of the target from the ultrasonic module according to the sending and receiving time of the ultrasonic signal, that is, the air height L.

[0089] The radar module is based on the principle of radar Doppler effect. The radar module transmits a transmission signal of a certain frequency. When the transmission signal contacts the target, a reflection signal is generated. The frequency of the reflection signal is related to the moving speed of the target. The radar module calculates the moving speed q of the target according to the frequency change of the transmission signal.

[0090] After the MCU module receives the empty height L sent by the ultrasonic module through the UART serial port, the MCU module calculates the water level value h according to the difference between the installation height H and the empty height L, and then calculates the cross-sectional area S of the open channel water body according to the product of the channel width D and the water level value h, that is, the cross-sectional area of ​​the open channel water body (S) = water level value (h) * channel width (D);

[0091] After the MCU module receives the moving speed q sent by the radar module through the UART serial port, the MCU module calculates the open channel flow Q according to the product of the moving speed q and the cross-sectional area S, that is, the open channel flow (Q) = cross-sectional area (S) * moving speed (q);

[0092] Finally, the MCU module controls the display module through the SPI interface to display the open channel flow Q on the LCD screen.

[0093] Furthermore, it also includes step S6: when the measuring device is connected to the intrinsically safe handheld terminal for mining through the Bluetooth module, the setting information sent by the intrinsically safe handheld terminal for mining is received, and finally the MCU module transfers it to the storage module for storage, and the stored data includes setting parameters and flow data.

[0094] Furthermore, it also includes step S7: when the measuring device receives an instruction sent by the upper-level device, i.e., the data receiving device, through the RS485 module, the MCU module extracts the flow data from the storage module and sends it to the RS485 module, and the RS485 module sends the flow data to the upper-level device, thereby completing the upload of the open channel flow data.

[0095] Compared with traditional manual monitoring methods such as buoy method and volumetric method, the measuring device of the present invention adopts ultrasonic and radar technology to achieve high-precision flow measurement. The measurement accuracy of the ultrasonic module reaches ±1mm, and the measurement accuracy of the radar module is ±0.05m / s, which is much higher than the accuracy of manual measurement and can more accurately reflect the real-time changes of open channel flow.

[0096] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An automatic open channel flow measurement device for underground coal mines, characterized in that: It includes a shell, a bottom cover arranged on one side of the shell and a probe mounting plate arranged on the other side of the shell. An ultrasonic probe, a radar, a liquid crystal screen and a main board are arranged inside the shell. The ultrasonic probe is fixed on the inner wall of the probe mounting plate. The main board is connected to the radar and the ultrasonic probe through wires. A connector is arranged on one end of the shell.

2. The automatic open channel flow measuring device for underground coal mines according to claim 1 is characterized in that: The bottom cover is provided with a group of mounting parts, a lampshade and a transparent window, the mounting parts are located between the lampshade and the transparent window, the transparent window is inlaid on the bottom cover, and the liquid crystal screen is fixed on the inner wall of the transparent window.

3. The automatic open channel flow measuring device for underground coal mines according to claim 1 is characterized in that: A side of the shell body close to the radar is arranged as a radar cover.

4. An automatic open channel flow measurement system for underground coal mines, characterized in that: The device comprises the measuring device, data receiving device and mining intrinsically safe handheld terminal according to any one of claims 1 to 3, wherein the measuring device is connected to the data receiving device via a connector, the measuring device is wirelessly connected to the mining intrinsically safe handheld terminal, and the measuring device further comprises: MCU module, used for logic control and data calculation processing; Radar module, used to output target speed information; Ultrasonic module, used for ultrasonic distance measurement; Light alarm module, used for alarm flashing; Display module, used for equipment information and real-time data display; RS485 module, used for data communication with the upper level data receiving device or data receiving server; Storage module, used for storing historical data; Bluetooth module, used for wireless communication and setting measurement device parameters; Power module, used to provide stable power supply and protect power supply; The ultrasonic module is located on the ultrasonic probe of the measuring device, the radar module is located on the radar of the measuring device, and the MCU module, light alarm module, display module, RS485 module, storage module, Bluetooth module and power module are all arranged on the main board.

5. The open channel flow automatic measurement system for underground coal mines according to claim 4 is characterized by: The MCU module is connected to the ultrasonic module and the radar module through the UART interface for data interaction, the MCU module is connected to the RS485 module through the UART interface for communication interaction, the MCU module is connected to the data receiving device through the RS485 module, the MCU module is connected to the Bluetooth module through the UART interface for Bluetooth wireless communication, and the MCU module is connected to the mining intrinsically safe handheld terminal through the Bluetooth module.

6. The open channel flow automatic measurement system for underground coal mines according to claim 4, characterized in that: The MCU module is connected to the light alarm module through the IO interface to flash the alarm, and the MCU module is connected to the display module and the storage module through the SPI interface to display on the LCD screen and store and read data.

7. An automatic open channel flow measurement method for underground coal mines, characterized in that: The following steps are involved: S1: Install fixed brackets on both sides of the open channel and set the fixed brackets parallel to the open channel; S2: Use screws to install the measuring device on the fixed bracket through a set of mounting parts on the measuring device, and adjust the fixed bracket until the measuring device is located in the center of the open channel and vertical to the open channel; S3: Use a ruler to measure parameters: installation height H and channel width D; S4: After powering the measuring device, use the mining intrinsically safe handheld terminal to connect to the measuring device via Bluetooth, and set the installation height H and channel width D through the terminal; S5: After completing step S4, the measuring device can automatically measure the open channel flow rate and display the open channel flow rate data on the LCD screen of the measuring device.

8. The method for automatically measuring flow in an open channel for underground coal mines according to claim 7, characterized in that: The step S5 comprises: The ultrasonic module calculates the distance of the target to be measured from the ultrasonic module according to the ultrasonic signal sending and receiving time, that is, the air height L; The radar module calculates the moving speed q of the target according to the frequency change of the transmitted signal; The MCU module calculates the water level value h according to the difference between the installation height H and the empty height L, and then calculates the cross-sectional area S of the open channel water body according to the product of the channel width D and the water level value h; The MCU module then calculates the open channel flow rate Q based on the product of the moving speed q and the cross-sectional area S. Finally, the MCU module controls the display module through the SPI interface to display the open channel flow Q on the LCD screen.

9. The method for automatically measuring flow in an open channel for underground coal mines according to claim 8, characterized in that: It also includes step S6: when the measuring device is connected to the intrinsically safe handheld terminal for mining through the Bluetooth module, it receives the setting information sent by the intrinsically safe handheld terminal for mining, and finally transfers it to the storage module for storage by the MCU module. The stored data includes setting parameters and flow data.

10. The method for automatically measuring flow in an open channel for underground coal mines according to claim 9, characterized in that: It also includes step S7: when the measuring device receives an instruction sent by the upper-level device, i.e., the data receiving device, through the RS485 module, the MCU module extracts the flow data from the storage module and sends it to the RS485 module, and the RS485 module sends the flow data to the upper-level device, thereby completing the upload of the open channel flow data.

Images