[Explanation] Just like the regular maintenance of a car in a 4S shop, the train has to go back to the "4S shop" for maintenance and repair for a period of time.
In mid-to-late February, the reporter came to the Lanzhou West Depot of the China Railway Lanzhou Bureau Group, known as the "train 4S shop," and entered the plant. The sound of beating and machine running came one after another.
Axle decorator Liu Xiaoyan operates a CNC cylindrical grinder to inspect and repair the axle wheel seat.
During the operation of the machine, she closely followed the values on the screen and compared and analyzed the deviation data.
She said that it seems that the work is simple, but the data is slightly biased, which directly affects the assembly of the wheel and axle, so I dare not slack off.
[Concurrent] Liu Xiaoyan, Axle Fitting Worker, Lanzhou West Depot, China Railway Lanzhou Bureau Group
We must ensure that the roundness, cylindricity, and roughness of the processed axle wheel seats meet the requirements. If there is a size error in our place, it will affect the assembly of the rear wheel pair.
[Explanation] Lanzhou West Depot is the largest vehicle maintenance base of Lanzhou Railway Administration. Every day, freight trains receive comprehensive "maintenance".
Dismantling, cleaning, testing, locomotive assembly...The employees in each process operate large machinery or high-tech equipment.
He Qiang, who has been working in overhaul jobs for more than 20 years, has witnessed the process from manual overhaul to machine assistance.
[Concurrent] He Qiang, Axle Fitting Worker, Lanzhou West Depot, China Railway Lanzhou Bureau Group
(Previously) Fastening the claws of the wheel cake, tightening by hand, there are a total of 3 claws, each time one piece is processed, it needs to be three times, and after processing, it needs to be loosened three times, and then find the leveling, alignment, Look for roundness, (and) the hands may get blisters, the work clothes are particularly dirty, and the whole body is greasy.
[Explanation] He Qiang, with neat and clean tooling, operates the machine to transport the wheels to the CNC boring machine, enter the values, and start the machine overhaul.
According to He Qiang's recognition, wheel and axle decoration is a chore, but nowadays, the application of high-tech equipment makes work a lot easier.
[Concurrent] He Qiang, Axle Fitting Worker, Lanzhou West Depot, China Railway Lanzhou Bureau Group
Now it is processed with a numerical control boring machine. After the computer program is set up, the target size is input and the processing is automatically performed. The finish is good, the pass rate is high, relatively speaking, the labor intensity is low, and the clothes are clean.
[Explanation] Zhang Mingfu, party branch secretary of the wheel and axle workshop of the Lanzhou West Depot, said that the train is affected by various external factors such as weather during operation, and the wheel damage rate is high. Therefore, it needs to be disassembled and repaired. The required accuracy is one thousandth of a millimeter, which is one sixtieth of a hair strand.
[Concurrent] Zhang Mingfu, Party Branch Secretary, Axle Workshop, Lanzhou West Depot, China Railway Lanzhou Bureau Group
The press-fitting accuracy of the axles and bearings is selected according to the standard of one thousandth (mm). After a unified measurement and selection, we can ensure that the precision dimensions we choose are accurate, so as to ensure that our wheel sets are installed on the car. , Can run safely, if there is a mistake, our axle will have a hot axle (phenomenon), which will eventually cause the train to subvert.
[Commentary] Li Yi, deputy secretary of the party committee of the Lanzhou West Depot, told reporters that they are "heroes behind the scenes" on the Wanli Railway, and they silently contribute to ensure that the train runs far away.
[Concurrent] Li Yi, Deputy Secretary of the Party Committee of Lanzhou West Depot of China Railway Lanzhou Bureau Group
Our Lanxi Depot is a unit responsible for the overhaul of freight cars, just like the "4S shop" of freight cars. It can be said that 50,000 freight cars running on national railway lines every day belong to Lanxi Depot overhaul.
Ai Qinglong reports from Lanzhou, Gansu
Editor in charge: 【Luo Pan】