Recently, good news came from the East Wing Return Air Main Roadway of Liuzhuang Coal Mine: the mining dual-shield full-face hard rock tunnel boring machine "Xindun No. 1" (China Railway 1429), jointly developed by China Coal Xinji and China Railway Engineering Equipment Group, has successfully completed its tunneling task and achieved smooth breakthrough of the roadway.

"Xindun No. 1" has an excavation diameter of 6.03 meters, a total length of 85 meters, and a total weight of about 750 tons. It integrates tunneling, support, and mucking functions, and can carry out key processes such as tunneling, support, and mucking simultaneously. During equipment tunneling, it achieved excellent results of a maximum monthly advance of 371 meters and a maximum daily advance of 17.5 meters, and successfully completed U-shaped curve tunneling construction with a turning radius of 70 meters and a length of 264 meters, realizing integrated intelligent operation of "tunneling, support, and transport." This provides valuable experience for efficient tunneling under complex geological conditions in the coal mine field and effectively solves the current problem of "imbalance between mining and excavation" restricting the coal mining industry.

Adhering to the service philosophy of "efficient and professional," the China Railway Engineering Equipment Group service team worked closely with the mine owner during construction. Through continuous process optimization and technological innovation, they solved technical challenges in coal mine roadways such as difficult construction under broken roof conditions in sandstone strata, low efficiency caused by easy clogging of the cutterhead in mudstone strata, and high risk of trolley tilting in curve sections, ensuring smooth progress of construction and providing solid guarantees for efficient equipment operation. The team was commended by the mine owner, which specifically noted in a letter of thanks: "This is the mine's first shield tunneling operation line and is of milestone significance for improving the level of mechanization!"

In recent years, China Railway Engineering Equipment Group has deeply implemented General Secretary Xi Jinping's important instruction of the "Three Transformations." While maintaining its market share in shield tunneling machines in traditional fields, it has increased R&D investment in emerging fields such as mining and continued technological innovation. It has successfully developed a number of high-performance, highly adaptable tunneling tools, including the world's first mining small-turning-radius TBM, China's first dual-support mining TBM, China's first mining shield-type TBM, China's first mining steep-gradient TBM, and China's first low-profile semi-coal-rock bolter-miner. These have been widely used in coal mines and non-coal mines, helping mining enterprises achieve efficient shaft and roadway tunneling and actively promoting the development of the green mining industry.