Underground coal mine personnel identification system

Abstract

The utility model discloses a coal mine underground personnel identification system, which comprises a camera, a visual processing module, a UWB communication module, a UWB antenna and a master control module, the output end of the camera is connected with the visual processing module, the visual processing module is connected with the master control module, the UWB antenna is connected with the UWB communication module, and the master control module is connected with the UWB communication module. And the UWB communication module is connected with the main control module. The utility model provides a coal mine underground personnel identification system which can more effectively identify the identities of underground personnel, reduce the error identification rate, improve the working efficiency of the coal mine underground personnel and guarantee the safety.

Description

Technical Field

[0001] The utility model relates to a coal mine underground personnel identification system, belonging to the technical field of coal mine safety monitoring. Background Art

[0002] With the rapid development of information technology, coal mine monitoring technology is constantly being updated and upgraded, including the widely used personnel identification system. Designed specifically for the unique environment of coal mines, these systems aim to improve the effectiveness and safety of personnel identification underground in coal mines. Traditional personnel identification systems use identification card technology, whereby individual information is written onto each identification card. Reading stations are installed in designated areas underground to identify the individual's identity. However, if an underground worker wears the wrong identification card, this method can lead to misidentification, resulting in errors in identification and compromising the safety of underground workers. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the existing technology and provide a coal mine underground personnel identification system that can more effectively identify the identities of underground personnel, reduce the misidentification rate, improve the work efficiency of underground coal mine personnel and ensure safety.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A coal mine underground personnel identification system includes a camera, a visual processing module, an UWB communication module, a UWB antenna and a main control module, wherein the output end of the camera is connected to the visual processing module, the visual processing module is connected to the main control module, the UWB antenna is connected to the UWB communication module, and the UWB communication module is connected to the main control module.

[0006] Furthermore, the visual processing module includes a visual power supply circuit, a visual processor, a visual peripheral voltage conversion circuit, a visual communication circuit and a visual peripheral expansion circuit. The visual power supply circuit is used to power the visual processor, the visual peripheral voltage conversion circuit, the visual communication circuit and the visual peripheral expansion circuit. The visual peripheral voltage conversion circuit, the visual communication circuit and the visual peripheral expansion circuit are all connected to the visual processor. The visual processor communicates with the main control module through Ethernet via the visual communication circuit, and the camera is connected to the visual processor.

[0007] Furthermore, the main control module includes a main control power supply circuit, a main control processor and a main control Ethernet communication circuit. The main control power supply circuit is used to power the main control processor, the main control Ethernet communication circuit and the UWB communication module. The UWB communication module performs SPI communication with the main control processor. The main control Ethernet communication circuit is connected to the main control processor. The main control processor performs Ethernet communication with the visual processing module through the main control Ethernet communication circuit.

[0008] Furthermore, the main power supply circuit includes a main voltage conversion circuit and a thyristor protection circuit. The main voltage conversion circuit is used to convert the external intrinsically safe power supply into a voltage for use by the main processor, the main Ethernet communication circuit and the UWB communication module. The thyristor protection circuit is used to perform overvoltage protection on the voltage output by the main voltage conversion circuit.

[0009] By adopting the above technical solution, the utility model collects facial data of personnel through the camera and visual processing module, and simultaneously collects personnel identification card information through the UWB communication module and UWB antenna. Finally, the main control module combines the two information again, and compares and confirms the information of the person belonging to the current facial image with the information of the personnel identification card within the current range, further improving the accuracy and reliability of personnel identification. It ensures the safety of personnel in coal mines and promotes the intelligent upgrading of the coal mining industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a functional block diagram of the underground coal mine personnel identification system of the present utility model;

[0011] Figure 2 This is a circuit diagram of the visual power supply circuit of the present utility model;

[0012] Figure 3 The visual processor and visual peripheral voltage conversion circuit of the utility model

[0013] Figure 4 This is a circuit schematic diagram of the visual processor and visual communication circuit of the utility model;

[0014] Figure 5 This is a circuit schematic diagram of the vision processor and vision peripheral expansion circuit of the utility model;

[0015] Figure 6 This is a circuit schematic diagram of the UWB communication module of the present utility model;

[0016] Figure 7 This is a circuit diagram of the main control power supply circuit of the present utility model;

[0017] Figure 8 This is a circuit schematic diagram of the main control Ethernet communication circuit of the present utility model. DETAILED DESCRIPTION

[0018] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, this embodiment provides a coal mine underground personnel identification system, which includes a camera, a visual processing module, a UWB communication module, a UWB antenna and a main control module. The output end of the camera is connected to the visual processing module, the visual processing module is connected to the main control module, the UWB antenna is connected to the UWB communication module, and the UWB communication module is connected to the main control module.

[0020] After the system captures facial images of underground personnel through a camera, it transmits the video stream over Ethernet to the visual processing module. The visual processing module transmits the facial data of the personnel via Ethernet to the main control module. After correlating it with the corresponding personnel data stored in the main control module, the visual image data of the personnel is obtained. While the camera is capturing the images, the main control module uses the UWB communication module to collect real-time data from the identification card worn by the personnel. After the main control module collects the visual image data of the personnel and the identification card data, it correlates them. After the unique facial feature value of the personnel is connected with the corresponding unique identification card, the collected information is interactively uploaded to the host computer, realizing personnel identity recognition based on face and identification card.

[0021] like Figure 1 As shown, the visual processing module of this embodiment includes a visual power supply circuit, a visual processor, a visual peripheral voltage conversion circuit, a visual communication circuit and a visual peripheral expansion circuit. The visual power supply circuit is used to power the visual processor, the visual peripheral voltage conversion circuit, the visual communication circuit and the visual peripheral expansion circuit. The visual peripheral voltage conversion circuit, the visual communication circuit and the visual peripheral expansion circuit are all connected to the visual processor. The visual processor communicates with the main control module through Ethernet via the visual communication circuit, and the camera is connected to the visual processor.

[0022] The visual power supply circuit of this embodiment has the following features: a first voltage conversion circuit, a second voltage conversion circuit, and a third voltage conversion circuit:

[0023] like Figure 2As shown, the first voltage conversion circuit serves as the power input for the visual processing module. It utilizes power conversion chip U1, model TPS5450, which supports a wide input voltage range of 5.5V to 36V, provides up to 5A of continuous output current, and 18μA of shutdown current. Input voltage feedforward improves line regulation and transient response, and the system is protected by overcurrent limiting, overvoltage protection, and thermal shutdown. The circuit utilizes dual diodes for freewheeling to ensure smooth current flow and prevent damage to subsequent circuitry caused by reverse connection errors. The circuit is designed to output 5V for components such as the back-end visual processor and also serves as a 3.3V power input.

[0024] like Figure 2 As shown, the second voltage conversion circuit is the power conversion portion of the vision processing module. It uses power conversion chip U2, model TPS54202, to convert DC 5V to DC 3.3V for use in external circuits such as switches, relays, and lighting. C21 and C23 in this circuit act as filters. The SYS_RESET net label connects to the vision processor and is used to reset the 3.3V control circuitry used by subsequent circuits. Resistors R21, R25, and R29 are selected based on chip characteristics to provide a precise DC 3.3V output.

[0025] like Figure 2 As shown, the third voltage conversion circuit uses a power conversion chip U3, model LM1117-1.8, which outputs a DC 1.8V voltage to supply the 1.8V power supply required by the visual processor. Capacitor C13 is used to filter low-frequency interference, and capacitor C15 is used to filter high-frequency interference.

[0026] like Figures 3-5 As shown, the visual processor of this embodiment adopts NVIDIA graphics card U4, model NVIDIA-TM660M-A2.

[0027] like Figure 3 As shown, the visual peripheral voltage conversion circuit of this embodiment uses two TXB0108RGYR voltage conversion chips (U5 and U6) to convert the input DC 3.3V power supply to a high-precision DC 1.8V for use in the vision processor's serial port, general-purpose input and output ports, and other components. Using low-voltage communication reduces power consumption and increases communication speed. The FM24CL64 chip (U7) in the circuit uses IIC communication and is connected to pins 232 and 234 of the machine vision processor.

[0028] like Figure 4As shown, the visual communication circuit of this embodiment is the Ethernet communication circuit connection portion and USB debugging portion of the visual processor. R44 and R45 in the circuit are 120Ω resistors, which serve as Ethernet terminal matching resistors and are used to enhance signal continuity and improve the Ethernet circuit's anti-interference capability. The USB pins use MINI-USB, which is easy to plug and connect and can drive and debug various USB devices. R8 selects the USB interface function and is used if soldered; unsoldered. U11 is an N-type MOS tube AO3415, which acts as a switch.

[0029] like Figure 5 As shown, the visual peripheral expansion circuit of this embodiment is a USB 3.0 interface, which can be used to plug in expansion disks and connect terminal devices such as mice and keyboards for debugging the visual processor. Capacitors C39 and C40 are used to filter out interference and improve the stability of USB devices.

[0030] like Figure 6 As shown, the UWB communication module of this embodiment uses the DW1000 chip U10, which complies with the IEEE 802.15.4-2011 ultra-wideband standard, boasts high recognition accuracy, and provides bidirectional recognition capabilities. In the circuit, chip U10 is powered by the USB_3V3 input, which is filtered by capacitors C21, C22, C23, C24, C25, C26, C27, and C28 to achieve a higher-quality power supply. This embodiment also utilizes the HHM1595A1 balun, based on the DW1000's built-in radio frequency, to adjust impedance, expand bandwidth support, improve the quality of received and transmitted personnel identification radio frequency signals, and enhance system stability. In the circuit, D1 is a light-emitting diode, and resistor R16 is a current-limiting resistor to ensure the proper operation of the light-emitting diode. When chip U10 establishes normal SPI communication with the main control processor, the UWB_Status pin outputs a low level, generating a potential difference across the LED D1 to illuminate, indicating that chip U10 is operating normally. Pins 39, 40, 41, and 45 of DW1000 are SPI1_MOSI, SPI1_MISO, SPI1_CLK, and SPI1_IRQn, respectively, which together constitute the SPI communication circuit to the main control processor.

[0031] like Figure 1As shown, the main control module of this embodiment includes a main control power supply circuit, a main control processor and a main control Ethernet communication circuit. The UWB communication module and the main control processor are arranged on the same main control board, and the UWB communication module communicates with the main control processor through SPI. The main control power supply circuit is used to power the main control processor, the main control Ethernet communication circuit and the UWB communication module. The main control Ethernet communication circuit is connected to the main control processor, and the main control processor communicates with the visual processing module through the main control Ethernet communication circuit. Among them, the main control power supply circuit includes a main control voltage conversion circuit and a thyristor protection circuit. The main control voltage conversion circuit is used to convert the external intrinsically safe power supply into a voltage for use by the main control processor, the main control Ethernet communication circuit and the UWB communication module. The thyristor protection circuit is used to protect the voltage output by the main control voltage conversion circuit from overvoltage. The main control processor of this embodiment adopts the LPC1778FBD144 chip, which has the characteristics of high stability and high scalability. It supports multiple communication interfaces such as Ethernet, USB 2.0, UART, SPI, I2C, etc., and improves the compatibility of the system.

[0032] like Figure 7 As shown, the main control voltage conversion circuit uses a synchronous step-down converter chip U8, model LMR16020. The chip supports a wide input voltage range of 4.3V to 60V and an adjustable output voltage of 800mV to 50V. Capacitors C34 and C40 in the circuit are ceramic capacitors. C34 filters low-frequency interference signals from the input power supply, while C40 filters high-frequency interference signals, improving the power quality of the converter chip. Capacitor C32 is the bootstrap capacitor of the converter chip, which is used for normal output within the chip. Schottky diode D3 provides a freewheeling circuit during the step-down chip's shutdown period, ensuring normal operation of the converter chip. Inductor L1 serves as an energy storage element in the step-down circuit, meeting the requirements for the converter chip's use. Resistors R15 and R20 regulate the circuit's output voltage to meet the requirements of subsequent loads. The voltage calculation formula here is R15 = ((Vout - 0.75) / 0.75) * R20. Here, R15 uses a commonly used 47K resistor, and Vout is the 5V voltage required by the subsequent circuit. The calculated resistance of R20 is 8.1K. Resistor R21 is used to adjust the output power frequency of the step-down chip. The formula is R21 = 42904 * Fsw (KHZ) to the power of -1.088. Here, the commonly used frequency is 853 Hz, and the calculated resistance of R21 is 51K.

[0033] like Figure 7As shown in Figure 1, the thyristor protection circuit consists of thyristors D4, D5, and D16; Zener diodes D6, D7, and D16; resistors R24, R25, and R74; capacitors C38, C39, and C70; and other filter capacitors. The circuit's overvoltage protection principle is that Zener diodes D6, D7, and D16 use 1N4733 diodes, with a regulated voltage of 5.1V and a power of 1W. When the output voltage exceeds the load voltage, reaching 5.1V or above, the Zener diode turns on, triggering the thyristor through resistor voltage division, short-circuiting the subsequent circuit to provide protection.

[0034] like Figure 8 As shown, the master Ethernet communication circuit uses a low-power 100M Ethernet physical layer (PHY) chip U9, model LAN8720A. It supports a data rate of 100 Mbps and full-duplex transmission. This chip serves as a crucial communication path between the vision processor and the master processor, and also serves as the communication interface for uploading human analysis results. Resistors R37, R40, and R41 are 22 ohm resistors, used for signal matching during communication and enhancing the circuit's anti-interference capabilities. R35 is a pull-up resistor on the MDIO pin, ensuring stable signal transmission and enabling normal operation of the master processor. After establishing a connection with the master processor's pins, chip U9 pulls the LED1 / REGOFF pin high, applying a conduction voltage to the base of NPN transistor Q8, which illuminates the indicator connected to LED1 / LINK. When chip U9 is communicating data, LED2 / nINTSEL triggers a high or low level signal, applying an off or on voltage to the base of PNP transistor Q9, causing the indicator connected to LED1 / LINK to flash, indicating normal communication with the master processor.

[0035] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coal mine underground personnel identification system, characterized by: It includes a camera, a visual processing module, a UWB communication module, a UWB antenna and a main control module. The output end of the camera is connected to the visual processing module, the visual processing module is connected to the main control module, the UWB antenna is connected to the UWB communication module, and the UWB communication module is connected to the main control module. The visual processing module includes a visual power supply circuit, a visual processor, a visual peripheral voltage conversion circuit, a visual communication circuit and a visual peripheral expansion circuit. The visual power supply circuit is used to power the visual processor, the visual peripheral voltage conversion circuit, the visual communication circuit and the visual peripheral expansion circuit. The visual peripheral voltage conversion circuit, the visual communication circuit and the visual peripheral expansion circuit are all connected to the visual processor. The visual processor communicates with the main control module through Ethernet via the visual communication circuit, and the camera is connected to the visual processor.

2. The coal mine underground personnel identification system according to claim 1, characterized in that: The main control module includes a main control power supply circuit, a main control processor and a main control Ethernet communication circuit. The main control power supply circuit is used to supply power to the main control processor, the main control Ethernet communication circuit and the UWB communication module. The UWB communication module performs SPI communication with the main control processor. The main control Ethernet communication circuit is connected to the main control processor. The main processor performs Ethernet communication with the visual processing module through the main control Ethernet communication circuit.

3. The coal mine underground personnel identification system according to claim 2, characterized in that: The main power supply circuit includes a main voltage conversion circuit and a thyristor protection circuit. The main voltage conversion circuit is used to convert the external intrinsically safe power supply into a voltage for use by the main control processor, the main Ethernet communication circuit and the UWB communication module. The thyristor protection circuit is used to perform overvoltage protection on the voltage output by the main voltage conversion circuit.

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