The intelligent maintenance system can fully meet the maintenance needs of subway vehicles and can achieve comprehensive information management in subway management. It utilizes real-time monitoring of subway information and forms information resource sharing with the intelligent maintenance system, ensuring that subway vehicles can improve work efficiency in various management tasks and streamline information flow. In the intelligent maintenance system, maintenance data can be stored, and specific problems with the subway can be analyzed in future work, continuously optimizing the maintenance system, improving the maintenance skills of staff, standardizing maintenance processes, and reducing maintenance costs for subway vehicles. It ensures that under the role of intelligent maintenance, effective and scientific management of vehicles can be achieved, creating a scientific management model to ensure the normal and safe operation of subway vehicles during daily travel.
The Yanfang Line in Beijing is an important subway line in the suburbs of Beijing, with a total length of 20.5 km, including a branch line of 6.1 km, with 12 stations and 1 vehicle base. The maximum speed during subway operation can reach 80 km/h. The Yanfang Line was fully connected on May 25, 2017, and began trial operation on December 30, 2017. The intelligent maintenance system is mainly divided into the intelligent control system of the vehicle section and the microcomputer error prevention interlocking system. This article analyzes subway vehicle maintenance through these two intelligent systems.
The main function of the intelligent control system of the vehicle section is to manage vehicles. The intelligent control system has automatic haul technology and maintenance tracking processes, forming information data stored in the system hard disk. This system can scientifically and reasonably achieve vehicle maintenance, improve maintenance efficiency and quality. The system has the following goals for subway vehicle maintenance:
(1) Improve the efficiency of subway planning and ensure that planning can be automated and released to staff when vehicles cannot be maintained. Timely feedback to upper management, and timely replacement of damaged parts and components in vehicles.
(2) Conduct comprehensive monitoring of the materials being maintained, and during the maintenance process, establish vehicle signage and maintenance material identification to ensure that staff use materials consistent with original materials during maintenance, ensuring the lifecycle of parts.
(3) During the maintenance operation, through the intelligent collaboration of the vehicle section’s intelligent control, it can comprehensively record maintenance operation information and the maintenance strategies proposed during the maintenance process.
(4) Maintenance visibility ensures that other parts of the vehicle are not damaged.
(5) During the maintenance of subway vehicles, it can control the quality inspection process of vehicles to ensure that maintenance quality meets the requirements for safe operation of vehicles.
(6) An intelligent fault storage library and information on the vehicle’s manufacturer and service life can be established within the intelligent control system of the vehicle section.
(7) During the maintenance work, effective management of the maintenance implementation and systematic analysis of the entire maintenance process, along with proper record-keeping, is essential.
(8) Provide professional training for staff to ensure they can quickly become proficient in using the intelligent control system of the vehicle section, timely follow up on subway vehicle maintenance, and comprehensively improve the technical and management capabilities of staff.
The microcomputer error prevention interlocking system utilizes a relatively advanced graphical simulation system. This system can set up workflow tables and simulate detection graphics based on the specific workflow of subway vehicle maintenance, providing significant assistance for future maintenance work. Additionally, during maintenance, staff can perform systematic operations based on the simulated detection graphics and verify maintenance quality. The system can operate subway vehicle equipment and verify maintenance results. After ensuring that the maintenance is correct, operations can be performed using the correct maintenance methods to meet the needs of subway stations.
Moreover, this system contains a computer graphical simulation system that can utilize multimedia technology to ensure that during maintenance, the quality of vehicle components remains consistent with the original components. This avoids performing maintenance in a state where switches are not isolated and prevents the closure of isolation switches. Additionally, this system avoids maintenance while the vehicle is energized.
(1) Composition of the Intelligent Control System of the Vehicle Section
The main components of this system include the central control platform, intelligent maintenance, equipment management, and safety during maintenance.
(1) Central Control Platform
This platform mainly includes five sub-functions: system management, data integration, maintenance planning, maintenance report data analysis, and system interface management. As shown in Figure 1.
(2) Intelligent Maintenance
Intelligent maintenance can supervise and manage the entire maintenance process and develop a comprehensive maintenance workflow, including preparation for maintenance, plan writing, repair of damaged parts, vehicle quality maintenance, vehicle accident maintenance, maintenance management, and staff training management. Given the current development of subways, it is necessary to input maintenance cycles, maintenance procedures, and production capacity into the system. This system can automatically generate plans and scientifically design maintenance procedure templates through adjustments based on explanations, systematically analyze existing vehicles, and automatically generate work reports.
(3) Scientific Management of Equipment
This system needs to comprehensively collect detection data when automatically generating detection data and analyze the data, transmitting it to the system storage library and monitoring changes in real time to ensure that its operating status meets operational requirements. It also records the last maintenance time and can automatically remind about maintenance and record data based on specific times. When staff need maintenance data, they can query it within the system.
Additionally, this system has a fault storage library that can issue warnings or alarms for detected faults during maintenance, and the system display can automatically prompt staff with specific fault inspection and resolution plans. The system can also automatically monitor the status of on-site vehicles and record their status and license plate numbers for timely maintenance in future work.
(4) Safety During Maintenance
For the intelligent control system of the vehicle section, it can ensure personnel safety during vehicle maintenance and systematically manage and control vehicle equipment. After controlling the isolation switch of the maintenance platform, staff can implement remote network control when accessing the system, and utilize the video linkage in the system to protect against hazardous incidents during maintenance. In case of an unexpected danger, the intelligent image alarm function can automatically activate to ensure the safety of staff during maintenance. Additionally, considering the geographical location of safety production in the vehicle section and the entire production process, all aspects can be included in effective management, establishing a programmatic and networked safety management system, ensuring the safety of staff during maintenance.
(2) Composition of the Microcomputer Error Prevention Interlocking System
The components of the microcomputer error prevention interlocking system mainly include a communication configurator, a system data collection library, and an intelligent voice system.
The communication configurator mainly transmits data generated during maintenance operations and is equipped with functions such as computer keys, error prevention interlocking, and maintenance training. The system data collection library has multiple maintenance functions for vehicle equipment and can automatically draw and modify graphics during maintenance, allowing for definitions and modifications of computer interlocking programs, improving extensibility.
Moreover, this system mainly includes an operation ticket expert system, which can print maintenance data and display accurate maintenance data. During data transmission, the data is finally stored in the database. When the database exceeds storage capacity, unnecessary data can be deleted in a timely manner, and hierarchical permission management for data can be implemented. The intelligent voice system configured in the system can provide specific maintenance process voice broadcasts during maintenance, allowing staff to perform data operations under simulated rehearsals, with all processes using voice prompts and proposing erroneous operation types with professional maintenance awareness.
The intelligent maintenance system can integrate into various industries and perform comprehensive maintenance on any equipment. In various subway industries, due to the presence of numerous hidden issues in subway vehicles, it is essential to ensure the safety of vehicles during operation. For vehicle maintenance, when utilizing the intelligent maintenance system, maintenance instruments can be integrated into the intelligent system, as shown in Table 1.
All equipment contained in the above vehicles can be connected to the intelligent device, and during the detection process, the intelligent maintenance system will collect data from the vehicles, and when damage is detected, it can promptly issue alerts, prompting staff to maintain the equipment in a timely manner, ensuring the safety of subway vehicle operations.
Due to the limited application of intelligent maintenance systems in the subway industry in China, some regions are unable to timely identify the operational status of subway vehicles. If there are hidden issues during operation, over time, the potential problems will become more apparent.
Therefore, this article analyzes the intelligent maintenance system, which can timely maintain vehicles and collect maintenance data, providing certain assistance for future work. Additionally, it studies the composition of the intelligent maintenance system and finally describes the maintenance equipment that can be integrated into the intelligent maintenance system for subway vehicles, highlighting the significant role of the intelligent maintenance system in ensuring vehicle safety during maintenance.
Author’s Biography:
Wang Maorun (1989—), male, from Benxi, Liaoning, holds a bachelor’s degree, currently works at China CNR Changchun Railway Vehicles Co., Ltd., assistant engineer, research direction: railway vehicle maintenance.
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