It is the peak period of the return of the Spring Festival, and the high-speed rail EMU train is full of passengers on the high-speed rail line every day, but many people report that the train ticket can not be bought, and the public reflects the difficulty of buying tickets, 12306 customer service staff said that due to the large number of passengers, the train is almost in operation, and it is difficult to temporarily add trains. As we all know, EMUs are not running on the road 24 hours a day, and they are generally overhauled at night, so do you know how often EMUs are overhauled? How is the EMU maintenance cycle divided?
China's EMU trains implement a planned preventive maintenance system, the maintenance cycle is mainly based on kilometers, supplemented by time, and the maintenance cycle is divided into five levels, namely first-level repair, second-level repair, first-class repair, fourth-level repair and fifth-level repair. Thereinto.
The first and second levels belong to the application and maintenance, which is mainly maintenance, mainly completed in the EMU; Level 3, 4 and 5 belong to advanced maintenance, which is mainly to restore basic performance, and is mainly completed in the EMU or the main engine factory. Let's take a look at the overhaul content included in the repair process at all levels:
1) Level 1 overhaul - routine inspection
In order to improve the utilization rate of EMUs, the first-level maintenance is generally carried out during the night parking of EMUs, mainly for inspection, including braking, running, pantograph including comprehensive inspection, toilet sewage, cleaning and cleaning.
2) Secondary overhaul - special overhaul.
For secondary inspection items, the maintenance cycle and content of each work item are different. The main contents include hollow axle flaw detection, tread modification, gearbox oil change, bearing lubrication, functional testing of important systems and components, etc.
3) ** overhaul - bogie disassembly overhaul.
* The overhaul is mainly the disassembly and maintenance of the bogie, and the status inspection and functional test of the braking, traction, air conditioning and other systems.
4) Four-level overhaul - system disassembly overhaul.
The four-level overhaul is mainly aimed at the decomposition and maintenance of various systems of the EMU, mainly including the disassembly and maintenance of bogie, braking system and pantograph, the performance testing and replacement of motors and electrical appliances, and the maintenance of in-vehicle facilities.
5) Five-level overhaul - comprehensive disassembly and overhaul of the whole vehicle.
The fifth-level overhaul is a comprehensive disassembly and overhaul of the whole vehicle, updating parts and components on a larger scale, replacing the entire EMU bogie and wheelset, gear transmission system and braking system, traction motor and other components. Modernize and transform EMUs as needed. It mainly includes EMU disassembly, cleaning, inspection, repair, replacement, repainting of the car body, etc. In order to rationally allocate maintenance resources, modern EMU maintenance bases have been established in Beijing, Shanghai, Wuhan, Guangzhou, Chengdu, Xi'an, Zhengzhou and other places. A number of service stations are set up at major passenger terminals.
In order to better ensure the safe operation of the train and ensure that passengers can go home safely, do you know?