Electronic warning board for rail transit

Abstract

The utility model provides an electronic warning board for rail transit, and relates to the technical field of warning devices. In the electronic warning board, a display screen is connected to a microcontroller through a level shifter; the communication module, the light sensor, the memory and the multi-channel switching value input detection circuit are respectively connected to the microcontroller; the communication module communicates with an upper computer to receive the warning state and the operation information; the memory stores the warning picture; the multi-channel switching value input detection circuit switches warning pictures according to the warning state; the microcontroller obtains the warning picture, the warning state and the operation information, transmits the warning picture, the warning state and the operation information to the display screen for display and controls the brightness of the display screen according to the illumination intensity; and when the signal at the sending point of the level translator is abnormal, the communication module sends maintenance prompt information to the upper computer. According to the electronic warning board, dynamic display of warning content can be achieved, and the working efficiency is improved; clear display of warning content under various illumination conditions can be achieved, the damage state of the display screen can be monitored, and the safety degree in the operation process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of warning devices, in particular to an electronic warning sign used in rail transportation. Background Art

[0002] Rail transit typically requires maintenance of vehicles, equipment, and roads after daily outages. When inspecting the catenary and related equipment, personnel must enter the track sections. To remind maintenance personnel of the current catenary status, confirm whether they can inspect the catenary or other equipment, and avoid electric shock or equipment damage, a sign is typically hung on the disconnector operating box to alert them to the current catenary status.

[0003] The current process for hanging signs on disconnector control boxes is as follows: When rail transit is shut down and overhead line work or testing is required, maintenance personnel must obtain paper signs and manually hang them on the disconnector control boxes in the designated area. After the work is completed, maintenance personnel must remove the paper signs from the control boxes and return them to the designated area. The cumbersome process of collecting and storing the paper signs, as well as manually hanging and removing them on-site, hinders operational efficiency. Furthermore, paper signs are not easily visible at night and are difficult to read.

[0004] On the other hand, each time the warning content of a light box warning sign is changed, manual labor is required to replace the background material on site or multiple warning signs need to work together. The content is single and fixed, and it is impossible to display dynamic content or automatically switch warning content, and the damage status of the warning sign cannot be obtained. Utility Model Content

[0005] In order to solve the above-mentioned technical problems existing in the prior art, the utility model aims to provide a warning sign that can reduce the complexity of operation, improve work efficiency, switch the warning content, and realize self-inspection of damage status.

[0006] Specifically, the present invention provides an electronic warning sign for rail transit, which includes: a display screen, a level converter, a communication module, a light sensor, a shading plate, a memory, a multi-channel switch input detection circuit and a microcontroller;

[0007] The display screen is connected to the microcontroller via a level converter; the communication module, the light sensor, the memory and the multi-channel switch input detection circuit are respectively connected to the microcontroller; the shading plate is arranged around the top edge and two side edges of the display screen;

[0008] The communication module is used to communicate with the host computer and receive warning status and operation information; wherein the warning status includes the contact network grounding status, maintenance operation status and no warning status;

[0009] The memory is used to store warning pictures;

[0010] The multi-channel switch input detection circuit is used to switch the warning picture according to the warning status;

[0011] The microcontroller is used to obtain the warning image, warning status and operation information and transmit them to the display screen for display, and control the brightness of the display screen according to the light intensity detected by the light sensor;

[0012] The microcontroller is also used to send maintenance prompt information to the host computer through the communication module when the signal at the level converter sending point is abnormal.

[0013] Furthermore, it also includes a USB interface;

[0014] The USB interface is connected to the storage device for updating the warning text and pictures on the external device.

[0015] Preferably, the communication module includes an external communication circuit and an RS485 communication interface;

[0016] The external communication circuit includes SP3485E chip U1, resistor R1, resistor R2, resistor R3, resistor R4, capacitor C1, TVS diode D1 and TVS diode U2;

[0017] The A and B lines of the RS485 communication interface are connected to the A and B pins of the SP3485E chip U1 respectively;

[0018] One end of resistor R1 is connected to line B and the other end is grounded;

[0019] One end of resistor R4 is connected to line B, and the other end is grounded;

[0020] One end of resistor R2 is connected to the RE and DE pins of the SP3485E chip U1, and the other end is grounded;

[0021] One end of resistor R3 is connected to the DI pin of SP3485E chip U1, and the other end is connected to the power module;

[0022] One end of capacitor C1 is connected to the VCC pin of the power module and SP3485E chip U1, and the other end is grounded;

[0023] TVS diode D1 is connected between line A and line B;

[0024] TVS diode U2 includes four Zener diodes; the cathode of the first Zener diode is connected to line A, and the anode is connected to the anode of the second Zener diode; the cathode of the second Zener diode is connected to the cathode of the third Zener diode and is grounded; the anode of the third Zener diode is connected to the anode of the fourth Zener diode; and the cathode of the fourth Zener diode is connected to line B.

[0025] The technical solution provided by the present invention can realize the dynamic display of warning content by replacing the warning picture according to the warning status through the communication module; further, it can reduce the number of installation and removal times of warning signs and improve work efficiency; in addition, the display screen is combined with the light sensor to realize clear display of warning content under various lighting conditions, and the setting of the level converter can monitor the damage status of the display screen and improve the safety level during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a schematic diagram of manually hanging paper signs in the prior art.

[0027] Figure 2 The figure is a schematic diagram of the appearance of an electronic warning sign in one embodiment of the present invention.

[0028] Figure 3 This is a circuit structure diagram of an electronic warning sign in one embodiment of the present utility model.

[0029] Figure 4 1 is a topological diagram of a multi-channel switch input detection circuit in one embodiment of the present invention.

[0030] Figure 5 This is a circuit topology diagram of a microcontroller chip in one embodiment of the present invention.

[0031] Figure 6 This is a topological diagram of the functional circuits in one embodiment of the present invention; wherein, (a) is the real-time clock circuit; (b) is the monitoring circuit of the MCU; and (c) is the oscillation source circuit of the MCU.

[0032] Figure 7 This is a MCU power supply decoupling circuit in one embodiment of the present invention.

[0033] Figure 8 This is a program download interface circuit in one embodiment of the present invention.

[0034] Figure 9 This is a circuit topology diagram of a communication module in one embodiment of the present invention.

[0035] Figure 10 FIG. 4 is a topological diagram of a level converter in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] Hereinafter, the technical solution provided by the present invention will be further elaborated in combination with embodiments and drawings.

[0037] like Figure 1 As shown, during the current rail transit maintenance process, warning signs are still mainly paper signs that need to be hung and removed by operating personnel according to the work content and procedures.

[0038] In addition, the light box warning signs with fixed content display are designed by the operators in advance based on the work content and display content. The film in the warning device is replaced and the light is controlled to be turned on and off according to the work content and procedures.

[0039] It can be seen that the above two traditional warning sign types require manual content replacement according to changes in the work content, and the warning content cannot be dynamically replaced according to needs, which affects work efficiency; and without auxiliary lighting or single auxiliary lighting, it is impossible to achieve clear display of warning content under various light intensities; further, when the warning film is damaged or a display failure occurs, it is difficult for the operator to discover it in the first time, making it impossible to guarantee the safety of the work process.

[0040] Example 1

[0041] This embodiment uses an LCD (Liquid Crystal Display) as the display device, enabling dynamic display without the need for manual sign replacement. Through control and status acquisition by an internal MCU (Microcontroller Unit), external communication, and linkage with other devices, the warning status can be automatically changed remotely and displayed automatically. The warning sign also includes a self-test function to check whether the display is functioning properly.

[0042] Specifically, such as Figure 2 、 Figure 3 As shown, the electronic warning sign provided in this embodiment adopts a high-brightness LCD large-screen display, a built-in 32-bit high-performance MCU controller, a power conversion circuit, a communication circuit, and an external input status acquisition circuit. When a communication command is received or a warning status is collected, the display screen will display the warning picture and warning status accordingly, and the operation information can be obtained through communication and displayed on the screen.

[0043] Warning status includes contact network grounding status, maintenance operation status (maintenance work in progress), and no warning status (rail transit equipment operating normally). Operation information includes the name, phone number, company name, department, and construction content of the operator (person in charge).

[0044] Before any maintenance or construction work begins on rail transit equipment, operational information is registered and recorded in the backend system. During the work, the backend system transmits this information via the host computer to warning signs, which display the relevant information. This allows construction workers and other personnel to easily confirm the current status of the vehicle.

[0045] The electronic warning sign should be designed with a sunshade to ensure clear visibility in direct sunlight. At night, the illumination should automatically adjust to avoid discomfort or glare. It should also be clearly visible in inclement weather, including but not limited to heavy rain and fog. The main technical parameters of the electronic warning sign are shown in Table 1.

[0046] Table 1 Technical parameters of electronic warning signs

[0047]

[0048] The functions of the electronic warning sign are as follows:

[0049] (1) Warning information display

[0050] The device can obtain the warning text (including warning status and operation information) that needs to be displayed through RS485 communication or external input detection. An electronic warning sign can display a variety of different warning information, namely warning pictures and warning text.

[0051] (2)RS485 communication

[0052] The device has one RS485 communication function, which is used to receive warning text or operation information from the host computer or other master station control display, and supports ModbusRTU protocol.

[0053] (3) Input detection

[0054] The device features a 4-channel switch input detection circuit that can switch to display different warning images based on the detected input status. In actual applications, the number of channels can be adjusted according to needs.

[0055] (4) Update of warning content

[0056] The electronic warning sign's memory contains three commonly used warning images used in rail transit. If the warning content needs to be modified or adjusted, it can be updated using a USB flash drive via the USB interface. Images are created based on the resolution of the warning sign's display and stored in a fixed file path on the USB flash drive. Simply inserting the flash drive into the sign allows the warning image to be updated. In practice, the number of warning images and the text content can be adjusted as needed. The USB flash drive can also be used with other devices that can exchange information via the USB interface.

[0057] Specifically, such as Figure 4 As shown, the circuit for input detection provided in this embodiment is a 4-channel switch input detection circuit.

[0058] In the diagram, F6 is a resettable fuse, D8 is a TVS diode (Transient Voltage Suppression Diode), R21, R23, and R25 are resistors, C35 and C37 are capacitors, D6 is a Zener diode, and U12 is an optocoupler. F6 and D8 form an overvoltage and surge protection circuit. When the input voltage exceeds 26V, TVS diode D8 conducts, generating a large current, and resettable fuse F6 applies overcurrent protection, safeguarding downstream circuitry. R21 is the primary current-limiting resistor, dissipating most of the power dissipation when an external signal is input. D6, R25, and C35 form an undervoltage and interference filtering circuit. Zener diode D6 turns off when the voltage drops below 5.1V, allowing current to flow back through R25. If the input signal experiences short-term interference voltage spikes, filter capacitor C35 absorbs the interference energy, which is then released through R25, preventing the interference signal from entering the downstream circuitry. U12 is an optocoupler that isolates the input signal from the subsequent circuit to prevent the input detection circuit from being damaged due to the voltage difference between the input signal and the subsequent circuit.

[0059] When the external communication module receives warning text and operation information, it switches the corresponding warning picture display according to the operation information.

[0060] In the microcontroller used in this embodiment, Figure 5 As shown, U4 is the main control MCU chip; Figure 6 As shown in (a), U5 is a real-time clock chip. Figure 6 As shown in (b), U6 is a watchdog chip that monitors the MCU power supply voltage and MCU operating status. C13-C18, a total of 6 ceramic capacitors, are MCU power filter capacitors to ensure MCU power supply stability. L1 is a magnetic bead that filters high-frequency interference from the MCU power supply. Figure 6 As shown in (c), C10, C12, X1, and R11 form the MCU's oscillation source circuit. The MCU power supply decoupling circuit is as follows: Figure 7 As shown, the program download interface circuit is as follows Figure 8 shown.

[0061] like Figure 9 As shown, the communication module used in this embodiment includes an external communication circuit and an RS485 communication interface. Among them, U1, U2, R1, R4, and D1 constitute the external communication circuit. The U1 chip converts the single-ended level signal of the MCU controller into a differential communication signal, enhancing the communication distance and anti-interference performance. The pull-up and pull-down resistors on R1 and R4 maintain the communication bus in a stable state when idle, which can greatly improve the anti-interference performance. U2 and D1 are TVS diodes, which turn on when there is an external high pulse surge voltage, suppressing the common-mode interference and differential-mode interference of the communication bus. Through the above circuit, low-bit-error-rate communication with external devices is achieved.

[0062] Specifically, the external communication circuit includes an SP3485E chip U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a TVS diode D1, and a TVS diode U2;

[0063] The A and B lines of the RS485 communication interface are connected to the A and B pins of the SP3485E chip U1 respectively;

[0064] One end of resistor R1 is connected to line B and the other end is grounded;

[0065] One end of resistor R4 is connected to line B, and the other end is grounded;

[0066] One end of resistor R2 is connected to the RE and DE pins of the SP3485E chip U1, and the other end is grounded;

[0067] One end of resistor R3 is connected to the DI pin of SP3485E chip U1, and the other end is connected to the power module;

[0068] One end of capacitor C1 is connected to the VCC pin of the power module and SP3485E chip U1, and the other end is grounded;

[0069] TVS diode D1 is connected between line A and line B;

[0070] TVS diode U2 includes four Zener diodes; the cathode of the first Zener diode is connected to line A, and the anode is connected to the anode of the second Zener diode; the cathode of the second Zener diode is connected to the cathode of the third Zener diode and is grounded; the anode of the third Zener diode is connected to the anode of the fourth Zener diode; and the cathode of the fourth Zener diode is connected to line B.

[0071] The level converter in this embodiment is as follows Figure 10 As shown, the main control MCU communicates with the LCD display screen through U3 level conversion. When the LCD display screen is damaged, the sending point of U3 will not have the correct signal. After the MCU detects it, it can notify the external device that the warning sign is damaged and needs to be repaired.

[0072] In combination with the above embodiments and accompanying drawings, it can be seen that the technical solution provided by the present invention can realize the dynamic display of warning content by replacing the warning picture according to the warning status through the communication module; further, it can reduce the number of installation and removal of warning signs and improve work efficiency; in addition, the display screen is combined with the light sensor to realize clear display of warning content under various lighting conditions, and the setting of the level converter can monitor the damage status of the display screen and improve the safety level during the operation process.

[0073] Furthermore, on the basis of achieving the above-mentioned beneficial effects, each preferred scheme also achieves the following beneficial effects: the setting of the memory and the multi-channel switch input detection circuit can realize the replacement of the warning content locally according to the instructions of the host computer; the USB interface can realize the adjustment of local warning text and pictures, and further ensure that the electronic warning sign can locally replace the warning content in different application environments, avoiding replacement delays caused by network problems; the external circuit can realize low-error rate communication with external equipment.

Claims

1. An electronic warning sign for rail transit, characterized in that: It includes a display screen, a level converter, a communication module, a light sensor, a light shield, a memory, a multi-channel switch input detection circuit and a microcontroller; The display screen is connected to the microcontroller via a level converter; the communication module, the light sensor, the memory and the multi-channel switch input detection circuit are respectively connected to the microcontroller; the shading plate is arranged around the top edge and two side edges of the display screen; The communication module is used to communicate with the host computer and receive warning status and operation information; wherein the warning status includes the contact network grounding status, maintenance operation status and no warning status; The memory is used to store warning pictures; The multi-channel switch input detection circuit is used to switch the warning picture according to the warning status; The microcontroller is used to obtain the warning image, warning status and operation information and transmit them to the display screen for display, and control the brightness of the display screen according to the light intensity detected by the light sensor; The microcontroller is also used to send maintenance prompt information to the host computer through the communication module when the signal at the level converter sending point is abnormal.

2. The electronic warning sign for rail transit according to claim 1, characterized in that: Also includes a USB port; The USB interface is connected to the storage device for updating the warning image via an external device.

3. The electronic warning sign for rail transit according to claim 1, characterized in that: The communication module includes an external communication circuit and an RS485 communication interface; The external communication circuit includes SP3485E chip U1, resistor R1, resistor R2, resistor R3, resistor R4, capacitor C1, TVS diode D1 and TVS diode U2; The A and B lines of the RS485 communication interface are connected to the A and B pins of the SP3485E chip U1 respectively; One end of resistor R1 is connected to line B and the other end is grounded; One end of resistor R4 is connected to line B, and the other end is grounded; One end of resistor R2 is connected to the RE and DE pins of the SP3485E chip U1, and the other end is grounded; One end of resistor R3 is connected to the DI pin of SP3485E chip U1, and the other end is connected to the power module; One end of capacitor C1 is connected to the VCC pin of the power module and SP3485E chip U1, and the other end is grounded; TVS diode D1 is connected between line A and line B; TVS diode U2 includes four Zener diodes; the cathode of the first Zener diode is connected to line A, and the anode is connected to the anode of the second Zener diode; the cathode of the second Zener diode is connected to the cathode of the third Zener diode and is grounded; the anode of the third Zener diode is connected to the anode of the fourth Zener diode; and the cathode of the fourth Zener diode is connected to line B.

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