Brake plugboard of railway locomotive shunting operation safety auxiliary protection system

Abstract

The utility model belongs to the technical field of locomotive shunting operation, and particularly relates to a railway locomotive shunting operation safety auxiliary protection system brake plugboard which is installed on a shunting main machine and provided with a circuit structure. The circuit structure comprises an MCU unit, a power supply module, a communication interface module, a brake signal output circuit and a brake signal detection circuit. The power supply module obtains a working power supply of a brake plugboard from an adjusting and defending host. The MCU unit communicates with a debugging and defending host through the communication interface module to obtain a protection instruction; the brake signal output circuit receives a control instruction of the MCU unit, and a locomotive power supply generates a brake pulse signal; and the brake signal detection circuit is used for detecting whether the brake pulse signal is abnormal or not. According to the invention, the braking and parking functions of the locomotive before accidents such as collision of a soil barrier, crossing of a station boundary and breakthrough of a shunting closing signal in shunting operation can be realized, and the safety risk of shunting operation is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of locomotive shunting operations, and in particular relates to a brake plugboard of a safety auxiliary protection system for railway locomotive shunting operations. Background Art

[0002] For many years, shunting operations have been complex and entirely dependent on manual control. Accidents such as running blue lights, squeezing switches, crossing station boundaries, and disrupting train routes have been a common occurrence, especially with main locomotives. In addition to routine shunting operations such as entering and exiting the depot, switching, and coupling, main locomotives also perform temporary shunting tasks at some intermediate stations. These shunting operations lack technical and equipment safety assurances. Shunting operations at intermediate stations are connected to the mainline, and accidents can be highly hazardous and easily impact passenger safety. The gradual installation of the "Wireless Shunting Locomotive Signaling and Monitoring System (STP)" on dedicated shunting locomotives has significantly improved the safety of these operations. In contrast, main locomotives lack any technical safety measures for shunting operations, and the frequent occurrence of accidents in these operations has not been fundamentally improved. There is an urgent need to install advanced and practical technical safety equipment to improve the safety of shunting operations such as shunting within the depot and switching within stations, thereby preventing inertia accidents and other serious incidents.

[0003] During operations such as leaving the station, entering the station, changing lines, and trailering in the station yard, the locomotive may cross the closed shunting signal, hit the earth barrier, go out of the station boundary, press the derailer, or the electric locomotive may enter the no-grid area. In special scenarios, only voice alarms can be issued, and the locomotive cannot be braked in time, posing a great safety risk. Summary of the Invention

[0004] The purpose of the utility model is to address the problem that there is a lack of effective technical protection measures in the current shunting operation of the main locomotive, and to propose a brake plug plate of the railway locomotive shunting operation safety auxiliary protection system. When the shunting host monitors that the locomotive is in an overspeeding and over-advancing state within the protection range, the brake plug plate receives the protection instruction of the shunting host and sends a brake signal to the LKJ device according to the instruction. The LKJ device controls the locomotive emergency brake solenoid valve and generates braking.

[0005] In order to achieve the above purpose, the technical solutions adopted are:

[0006] A brake plugboard for a railway locomotive shunting operation safety auxiliary protection system is provided. The brake plugboard is installed on a shunting host and is provided with a circuit structure, which includes an MCU unit, a power module, a communication interface module, a brake signal output circuit, and a brake signal detection circuit. The power module obtains the working power of the brake plugboard from the shunting host; the MCU unit communicates with the shunting host through the communication interface module to obtain protection instructions; the brake signal output circuit receives the control instructions of the MCU unit and generates a brake pulse signal from the locomotive power supply; and the brake signal detection circuit is used to detect whether there is any abnormality in the brake pulse signal.

[0007] According to the brake plug board of the railway locomotive shunting operation safety auxiliary protection system of the utility model, the power supply module further includes an overcurrent protection and filtering circuit, a DCDC chip and an LDO voltage regulator chip. After the 12V power supply of the shunting host passes through the overcurrent protection and current protection and filtering of the filtering circuit, one route is converted into 5V voltage by the DCDC chip, and the other route is converted into 3.3V working power for the system by the LDO voltage regulator chip.

[0008] According to the brake plug plate of the railway locomotive shunting operation safety auxiliary protection system of the utility model, further, the communication interface module includes a communication conversion circuit and a backplane bus, the communication conversion circuit is connected to the shunting host through the RS485 bus, and the communication conversion circuit converts the RS485 level signal into a UART level signal and transmits it to the MCU unit.

[0009] According to the brake plug plate of the railway locomotive shunting operation safety auxiliary protection system of the utility model, further, the brake signal output circuit includes a hardware logic control circuit, and after the MCU unit receives the protection instruction from the shunting host, it sends a control instruction to the hardware logic control circuit.

[0010] According to the brake plugboard of the railway locomotive shunting operation safety auxiliary protection system of the utility model, further, the brake signal output circuit also includes two high-voltage optical isolators connected in series, and the two high-voltage optical isolators are controlled by the hardware logic control circuit to output the brake pulse signal.

[0011] According to the brake plug board of the railway locomotive shunting operation safety auxiliary protection system of the utility model, the circuit structure further includes an isolating switch, and the brake pulse signal output from the two high-voltage optical isolators passes through the isolating switch and then is transmitted to the LKJ device via a cable.

[0012] According to the brake plug plate of the railway locomotive shunting operation safety auxiliary protection system of the utility model, further, the brake signal detection circuit is connected to the isolating switch and the MCU unit, and has three-way switch quantity detection functions, namely the brake signal output state, the brake signal state after passing through the isolating switch, and the current state of the isolating switch.

[0013] According to the brake plugboard of the railway locomotive shunting operation safety auxiliary protection system of the utility model, further, the circuit structure also includes a hardware watchdog arranged between the MCU unit and the hardware logic control circuit.

[0014] The beneficial effects achieved by adopting the above technical solution are:

[0015] After installing the brake plug on the shunting host, the shunting operation safety auxiliary protection system (LSP) obtains the locomotive's precise position, the location of ground control points, and the activation status of station signals to comprehensively generate the protection instructions required for shunting operations for the main locomotive. The brake plug receives the protection instructions from the shunting host and sends a braking signal to the LKJ device according to the instructions. The LKJ device controls the emergency brake solenoid valve, which can brake and stop the locomotive before accidents such as hitting earth barriers, crossing station boundaries, and violating shunting shutdown signals during shunting operations, effectively reducing the safety risks of shunting operations. A hardware watchdog is added to prevent the MCU from freezing or outputting erroneous brake signals under abnormal conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings of the embodiments of the present invention. The drawings are only used to illustrate some embodiments of the present invention, and are not intended to limit all embodiments of the present invention to these drawings.

[0017] Figure 1 This is a circuit structure block diagram of a brake plugboard of a railway locomotive shunting operation safety auxiliary protection system according to an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of a power module according to an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of a communication interface module according to an embodiment of the present utility model;

[0020] Figure 4 This is a circuit diagram of a 2-way 485 communication interface of the backplane bus of an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of a brake signal generation and protection circuit according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of a brake signal output circuit and a brake signal detection circuit according to an embodiment of the present invention;

[0023] Figure 7 This is a brake signal output circuit diagram of an embodiment of the utility model;

[0024] Figure 8It is a block diagram of the braking principle of the brake plugboard in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings of specific embodiments of the present invention to clearly and completely describe the exemplary embodiments of the present invention. Unless otherwise defined, technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field.

[0026] like Figure 1 As shown, this embodiment provides a brake plate for a railway locomotive shunting operation safety auxiliary protection system. The brake plate is mounted on a shunting host and is provided with a circuit structure comprising an MCU unit, a power module, a communication interface module, a brake signal output circuit, and a brake signal detection circuit. The power module obtains the operating power for the brake plate from the shunting host. The MCU unit communicates with the shunting host via the communication interface module to obtain protection instructions. The brake signal output circuit receives control instructions from the MCU unit and generates a brake pulse signal from the locomotive power supply. The brake signal detection circuit is used to detect whether there is any abnormality in the brake pulse signal.

[0027] The power module includes overcurrent protection and filtering circuit, DCDC chip and LDO voltage regulator chip, which supplies power to the brake plug board through the DC12V power interface of the host bottom board. Specifically, after the 12V power supply is protected and filtered by the overcurrent protection and filtering circuit, one channel is converted to 5V / 2A by the DCDC chip, and the other channel is converted to 3.3V / 800mA working power by the LDO voltage regulator chip. Figure 2 shown.

[0028] like Figure 3 and Figure 4 As shown, the communication interface module includes a communication conversion circuit, a backplane bus, and card ID detection. The brake board communicates with the main control unit via a high-speed backplane bus. Alarm information is sent to the main control unit via the backplane bus, enabling data exchange with the main control unit. Specifically, the communication conversion circuit connects to the main control unit via an RS485 bus. The circuit converts RS485 level signals into UART level signals before transmitting them to the MCU. The main control unit can identify the brake board's slot location based on a 4-bit address code.

[0029] like Figure 5 and Figure 6As shown, the brake signal is derived from the locomotive system power supply (main locomotive power supply 110VDC / 74VDC). The brake signal output circuit includes a protection circuit, a hardware logic control circuit, and two series-connected high-voltage optical isolators. To prevent external interference signals from disrupting the brake pulse signal, the protection circuit incorporates overcurrent protection, overvoltage protection, and reverse polarity protection. Upon receiving protection commands from the main control unit, the MCU controls the output status of the brake pulse signal according to the control logic. The hardware logic control circuit, receiving control commands from the MCU, switches the two high-voltage optical isolators on and off, generating the brake pulse signal.

[0030] The circuit structure also includes an isolating switch, a hard switch that must be in the isolated state when the locomotive does not need the brake plug-in control function. The MCU receives protection instructions from the main control unit and controls the hardware logic control circuit and two high-voltage optical isolators to output a brake pulse signal. The brake pulse signal passes through the isolating switch and panel connector, and then is sent via a cable to the LKJ device. The LKJ device receives the brake signal and applies the brake to the locomotive, achieving the air release operation.

[0031] like Figure 6 and Figure 7 As shown, the brake signal detection circuit's input is connected to the isolating switch, and its output is connected to the MCU. It includes a signal protection circuit, an optoelectronic isolation circuit, and a signal conditioning circuit. It features three switch detection functions: the brake signal output status, the brake signal status after passing through the isolating switch, and the current isolating switch status. Upon receiving a protection command, the brake plug-in board transmits a brake pulse signal and monitors it in real time. If an abnormal output is detected, the brake pulse signal output is immediately disabled to prevent erroneous braking and an abnormality alarm is sent to the system.

[0032] In addition to the above structure, the circuit structure also includes a hardware watchdog set between the MCU unit and the hardware logic control circuit to prevent the output of erroneous braking signals when the MCU crashes or the program runs abnormally; when the MCU program runs abnormally, the hardware watchdog starts to prohibit the output, so that no braking pulse signal is output when the MCU failure causes an IO control logic error.

[0033] Here's how it works:

[0034] When the isolating switch is turned to "On," the MCU receives protection commands from the control host. The MCU controls the hardware logic control circuit and two high-voltage optical isolators to output brake pulse signals. Simultaneously, the brake signal detection circuit monitors the brake pulse signals in real time. If an abnormal output is detected, the brake signal output is immediately shut off and an abnormality alarm is sent to the system. Four LED indicators on the brake panel indicate operating status.

[0035] like Figure 8 As shown, the brake signal of the shunting main engine brake plug-in board is connected in parallel with the X31-2 terminal of the LKJ device. The LKJ device is then connected to the locomotive brake system via the X30-15 terminal to output an emergency brake signal, thus achieving emergency braking of the locomotive. The specific braking process is as follows: when the starting control conditions are met during the shunting operation, the brake plug-in board sends a brake pulse signal via the X1-1 terminal to the X31-2 pin of the LKJ device. After the LKJ device detects the brake pulse signal, it outputs a high-level signal to the emergency brake solenoid valve of the locomotive brake system via the X30-15 terminal to perform the air release action, thus achieving emergency braking of the locomotive. According to different locomotive control logic requirements, the locomotive can achieve braking functions at all parking points such as prohibited signals, earth barriers, station boundaries, and no-grid areas.

[0036] While preferred embodiments for implementing the present invention have been described in detail above, it should be understood that these embodiments are provided for illustrative purposes only and are not intended to limit the scope, applicability, or configuration of the present invention in any way. The scope of protection of the present invention is defined by the appended claims and their equivalents. Persons skilled in the art may make numerous modifications to the aforementioned embodiments based on the teachings of this invention, and such modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A brake plate for a railway locomotive shunting operation safety auxiliary protection system, characterized in that: The brake plugboard is installed on the deployment host, and a circuit structure is provided on the brake plugboard, which includes an MCU unit, a power module, a communication interface module, a brake signal output circuit and a brake signal detection circuit. The power module obtains the working power of the brake plugboard from the deployment host; the MCU unit communicates with the deployment host through the communication interface module to obtain protection instructions; the brake signal output circuit receives the control instruction of the MCU unit and generates a brake pulse signal from the locomotive power supply; the brake signal detection circuit is used to detect whether there is any abnormality in the brake pulse signal.

2. The railway locomotive shunting operation safety auxiliary protection system brake plug plate according to claim 1 is characterized in that: The power supply module includes an overcurrent protection and filtering circuit, a DCDC chip and an LDO voltage regulator chip. After the host 12V power supply passes through the overcurrent protection and filtering circuit, one route is converted into 5V voltage by the DCDC chip, and the other route is converted into 3.3V working power for the system by the LDO voltage regulator chip.

3. The railway locomotive shunting operation safety auxiliary protection system brake plug plate according to claim 1, characterized in that: The communication interface module includes a communication conversion circuit and a backplane bus. The communication conversion circuit is connected to the alarm host via an RS485 bus. The communication conversion circuit converts the RS485 level signal into a UART level signal and transmits it to the MCU unit.

4. The railway locomotive shunting operation safety auxiliary protection system brake plug plate according to claim 1, characterized in that: The brake signal output circuit includes a hardware logic control circuit. After the MCU unit receives the protection instruction from the defense host, it sends a control instruction to the hardware logic control circuit.

5. The railway locomotive shunting operation safety auxiliary protection system brake plug plate according to claim 4, characterized in that: The braking signal output circuit further includes two high-voltage optical isolators connected in series, and the two high-voltage optical isolators are controlled by the hardware logic control circuit to output a braking pulse signal.

6. The railway locomotive shunting operation safety auxiliary protection system brake plug plate according to claim 5, characterized in that: The circuit structure also includes an isolating switch. The braking pulse signals output from the two high-voltage optical isolators pass through the isolating switch and are then transmitted to the LKJ device via a cable.

7. The railway locomotive shunting operation safety auxiliary protection system brake plug plate according to claim 6, characterized in that: The brake signal detection circuit is connected to the isolating switch and the MCU unit, and has three switch quantity detection functions, namely the brake signal output state, the brake signal state after passing through the isolating switch, and the current state of the isolating switch.

8. The railway locomotive shunting operation safety auxiliary protection system brake plug plate according to claim 4, characterized in that: The circuit structure also includes a hardware watchdog arranged between the MCU unit and the hardware logic control circuit.

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