A wind tube air volume sensor

Abstract

The utility model discloses a kind of air duct air volume sensors, it includes mounting seat, first detection device and second detection device, the first detection device and second detection device are rotatably connected with mounting seat, the first detection device and second detection device are oppositely arranged, mainboard and power board are provided in the first detection device, vice board is provided in the second detection device, vice board is electrically connected with mainboard by cable, the power board is the power supply for mainboard and vice board;The mainboard includes MCU module, communication module and first attitude detection module, the communication module and first attitude detection module are electrically connected with MCU module, and the first attitude detection module is used to detect the inclination angle of first detection device.The utility model provides a kind of air duct air volume sensors, adopts inclination angle detection mode, it can realize more accurate air duct air volume measurement in pit, and it is convenient for promotion.

Description

Technical Field

[0001] This utility model relates to an air volume sensor for ventilation ducts, belonging to the field of coal mine safety monitoring technology. Background Technology

[0002] Currently, the coal mining industry across the country is developing rapidly. Therefore, ensuring the safe mining of coal is of paramount importance to the development of mines. This inevitably requires a stable mine ventilation system, which can provide sufficient fresh air underground and expel harmful gases to prevent the accumulation of methane.

[0003] Ventilation ducts are important facilities for ensuring local ventilation underground. They can deliver fresh air to areas that need ventilation. If the air volume in the ventilation duct is insufficient, fresh air cannot be supplied to the area that needs ventilation, leading to safety hazards. Therefore, it is necessary to have a device that can detect whether the air volume in the ventilation duct is sufficient in real time.

[0004] Traditional clamp-type ventilation duct airflow sensors are a relatively common type of sensor. Currently, almost all of these sensors are clamp-type with iron frames, suspended by hanging rings and straddling the flexible ventilation duct. When there is wind, the ventilation duct supports the iron frame, and the sensor magnet approaches the main unit, activating the internal reed switch. When there is no wind, the flexible ventilation duct is empty, the iron frame retracts, the sensor magnet moves away from the main unit, and the reed switch disengages. When detecting the presence or absence of wind in a mine ventilation duct, the weak air pressure at the end of the duct causes it to sway from side to side, leading to misjudgments by the clamp-type ventilation duct airflow sensor. This can cause the fan to shut down, and the ventilation duct airflow sensor participates in the wind power interlock control. When the ventilation duct airflow sensor detects an erroneous signal, it causes the fan to lose power, workers to stop operating, and mining efficiency to be affected.

[0005] Therefore, there is an urgent need for a stable ventilation duct airflow detection device to ensure safe production in mines. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a ventilation duct air volume sensor that adopts the tilt angle detection method. It can achieve more accurate measurement of ventilation duct air volume in underground mines and is easy to promote.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A duct airflow sensor includes a mounting base, a first detection device, and a second detection device. Both the first and second detection devices are rotatably connected to the mounting base and are arranged opposite to each other. The first detection device contains a main board and a power board, and the second detection device contains a sub-board. The sub-board is electrically connected to the main board via a cable, and the power board supplies power to the main board and the sub-board. The motherboard includes an MCU module, a communication module, and a first attitude detection module. Both the communication module and the first attitude detection module are electrically connected to the MCU module. The first attitude detection module is used to detect the tilt angle of the first detection device, and the communication module is used to communicate with the host computer monitoring system. The sub-board includes a second attitude detection module, which is electrically connected to the MCU module. The second attitude detection module is used to detect the tilt angle of the second detection device.

[0008] Furthermore, the first detection device is also equipped with a display panel, which is electrically connected to the main board, and the power board supplies power to the display panel.

[0009] Furthermore, the display panel includes a display module, which is electrically connected to the MCU module.

[0010] Furthermore, the MCU module includes an MCU chip U3, the model of which is STM32F103RCT6.

[0011] Furthermore, the communication module is an RS485 transceiver, and the model of the RS485 transceiver is SN65HVD72DR.

[0012] Furthermore, the first attitude detection module includes a first attitude detection chip U5, and the second attitude detection module includes a second attitude detection chip U1. Both the first attitude detection chip U5 and the second attitude detection chip U1 are MPU6050.

[0013] Furthermore, the power board includes a power input protection module, a transient suppression module, a common-mode filtering module, and a power conversion module. The power input protection module is used to provide surge overvoltage protection for the input power supply. The transient suppression module is used to suppress transient high voltage of the input power supply. The common-mode filtering module is used to suppress common-mode interference of the input power supply. The power conversion module is used to convert the input power supply into a voltage for use by the motherboard, sub-board, and display board.

[0014] By adopting the above technical solution, this utility model uses dual MPU6050 attitude detection chips, respectively located on the main board and the sub-board. By monitoring the attitude changes of the two chips, the presence or absence of airflow inside the duct can be determined, achieving comprehensive and high-precision detection of the duct's airflow status and improving detection accuracy. The power board features multiple input protections, supports wide voltage input, resists electromagnetic interference and voltage fluctuations, and adapts to complex industrial environments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the airflow sensor for the wind tunnel of this utility model; Figure 2 for Figure 1 The right view; Figure 3 This is a schematic diagram of the state of the air duct of this utility model when there is no wind. Figure 4 This is a schematic diagram showing the state of the air duct of this utility model when there is air inside; Figure 5 This is a circuit block diagram of the airflow sensor for the duct of this utility model. Figure 6 The circuit schematics are for the MCU module, memory chip, and first attitude detection module of this utility model. Figure 7 This is a circuit schematic diagram of the communication module of this utility model; Figure 8 This is a circuit diagram of the second attitude detection module of this utility model; Figure 9 This is a circuit diagram of the power supply board of this utility model. Detailed Implementation

[0016] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] like Figures 1-4 As shown, this embodiment provides a duct airflow sensor, which includes a mounting base 1, a first detection device 21, and a second detection device 22. The first detection device 21 is fixed on a first movable plate 31, and the second detection device 22 is fixed on a second movable plate 32. A shaft 11 is fixed inside the mounting base 1. The first movable plate 31 and the second movable plate 32 are arranged opposite to each other and are both hinged to the shaft 11, thereby realizing the rotatable connection between the first detection device 21 and the second detection device 22 and the mounting base 1. Both the first detection device 21 and the second detection device 22 adopt an IP68 waterproof housing to ensure that they can be used in underground coal mine environments.

[0018] The ventilation duct 4 is a flexible mine ventilation duct, such as a cloth duct. When there is no air inside the ventilation duct 4, the first movable plate 31 and the second movable plate 32 droop under their own weight, clamping the ventilation duct 4. When there is air inside the ventilation duct 4, the ventilation duct 4 will bulge and become full, spreading the first movable plate 31 and the second movable plate 32 clamped on both sides of the outer wall of the ventilation duct 4. The first movable plate 31 and the second movable plate 32 cause the first detection device 21 and the second detection device 22 to tilt. The first detection device 21 and the second detection device 22 can detect their own posture changes, indicating that there is air inside the ventilation duct 4. By observing the posture changes of the first detection device 21 and the second detection device 22, it can be determined whether there is air or no air inside the ventilation duct 4.

[0019] like Figure 5 As shown, the first detection device 21 in this embodiment contains a main board, a power board, and a display board, while the second detection device 22 contains a sub-board. Each circuit board is fixed to studs inside the housing using screws. The sub-board is electrically connected to the main board via cables placed in a corrugated pipe 5, which connects the housings of the first and second detection devices 21 and 22. The display board is electrically connected to the main board. The power board supplies power to the main board, sub-board, and display board. The housing of the first detection device 21 has an observation window 211 for viewing the display board.

[0020] like Figure 5 As shown, the mainboard in this embodiment includes an MCU module, a communication module, and a first attitude detection module. Both the communication module and the first attitude detection module are electrically connected to the MCU module. The first attitude detection module is used to detect the tilt angle of the first detection device 21, and the communication module is used to communicate with the host computer monitoring system. The sub-board includes a second attitude detection module, which is electrically connected to the MCU module. The second attitude detection module is used to detect the tilt angle of the second detection device 22.

[0021] like Figure 6 As shown, the MCU module in this embodiment includes an MCU chip U3, which is an STM32F103RCT6. It operates on a 3.3V power supply, and its I / O ports are connected to the first attitude detection module, the second attitude detection module, the communication module, and the storage chip U6. The high-capacity storage chip U6 works in conjunction with the MCU chip U3 to back up and store the data collected by the first and second attitude detection modules.

[0022] like Figure 7 As shown, the communication module in this embodiment is an RS485 transceiver U2, model number SN65HVD72DR. The MCU module communicates with the host computer monitoring system through the RS485 transceiver U2, which facilitates the connection of the duct air volume sensor to the monitoring system.

[0023] like Figure 8 As shown, the first attitude detection module in this embodiment includes a first attitude detection chip U5, and the second attitude detection module includes a second attitude detection chip U1. Both the first attitude detection chip U5 and the second attitude detection chip U1 are MPU6050. The MPU6050 has built-in accelerometers and gyroscopes in three directions to detect its own angle relative to the spatial coordinate axis 11.

[0024] like Figure 5As shown, the display panel in this embodiment includes a display module, which is electrically connected to the MCU module. The display panel uses a conventional four-digit LED display and transistor circuitry to display sensor parameters.

[0025] like Figure 9 As shown, the power board in this embodiment includes a power input protection module, a transient suppression module, a common-mode filter module, and a power conversion module U7. The power input protection module is used to provide surge overvoltage protection for the input power supply, the transient suppression module is used to suppress transient high voltage of the input power supply, the common-mode filter module is used to suppress common-mode interference of the input power supply, and the power conversion module U7 is used to convert the input power supply into a voltage for use by the motherboard, sub-board, and display board.

[0026] The power input protection module consists of a varistor RV1, inductors L1 and L5, and a glass discharge tube D4. When the input power supply experiences surge voltage or overvoltage (such as lightning strikes or grid fluctuations), the varistor RV1 will quickly break down, discharging the overvoltage energy to ground and preventing damage to downstream components from high voltage. Inductors L1 and L5, working in conjunction with the varistor RV1, suppress surge current, preventing large current surges when the varistor is conducting. The glass discharge tube D4 is used for circuit overvoltage protection, providing protection against lightning strikes or surges.

[0027] The transient suppression module consists of a TVS diode D5 and a capacitor C34, and is used to suppress transient high voltage and filter high-frequency spike interference.

[0028] The common-mode filter module is a common-mode inductor L4, which filters interference signals between the positive and negative lines of the input power supply and the ground line.

[0029] The power conversion module U7 is packaged with a power chip TPS5450 and a voltage regulator chip AMS1117. The power chip TPS5450 converts the 9-30V input power to 5V, and then the voltage regulator chip AMS1117 converts the 5V voltage to 3.3V for use by the motherboard, sub-board and display board.

[0030] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A duct airflow sensor, characterized in that: It includes a mounting base (1), a first detection device (21) and a second detection device (22). The first detection device (21) and the second detection device (22) are rotatably connected to the mounting base (1). The first detection device (21) and the second detection device (22) are arranged opposite to each other. The first detection device (21) contains a main board and a power board. The second detection device (22) contains a sub-board. The sub-board is electrically connected to the main board through a cable. The power board supplies power to the main board and the sub-board. The motherboard includes an MCU module, a communication module and a first attitude detection module. The communication module and the first attitude detection module are both electrically connected to the MCU module. The first attitude detection module is used to detect the tilt angle of the first detection device (21). The communication module is used to communicate with the host computer monitoring system. The sub-board includes a second attitude detection module, which is electrically connected to the MCU module. The second attitude detection module is used to detect the tilt angle of the second detection device (22).

2. The airflow sensor for a ventilation duct according to claim 1, characterized in that: The first detection device (21) is also equipped with a display board, which is electrically connected to the main board, and the power board supplies power to the display board.

3. The airflow sensor for a ventilation duct according to claim 2, characterized in that: The display panel includes a display module, which is electrically connected to the MCU module.

4. The airflow sensor for a ventilation duct according to claim 1, characterized in that: The MCU module includes an MCU chip U3, which is an STM32F103RCT6.

5. The airflow sensor for a ventilation duct according to claim 1, characterized in that: The communication module is an RS485 transceiver U2, and the model of the RS485 transceiver U2 is SN65HVD72DR.

6. The airflow sensor for a ventilation duct according to claim 1, characterized in that: The first attitude detection module includes a first attitude detection chip U5, and the second attitude detection module includes a second attitude detection chip U1. Both the first attitude detection chip U5 and the second attitude detection chip U1 are MPU6050.

7. The airflow sensor for a ventilation duct according to claim 2, characterized in that: The power board includes a power input protection module, a transient suppression module, a common-mode filtering module, and a power conversion module. The power input protection module is used to provide surge overvoltage protection for the input power supply. The transient suppression module is used to suppress transient high voltage of the input power supply. The common-mode filtering module is used to suppress common-mode interference of the input power supply. The power conversion module is used to convert the input power supply into a voltage for use by the motherboard, sub-board, and display board.

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