On March 31, the world's largest range-extended rotary drilling rig rolled off the production line in Changsha, central China's Hunan Province.

The 200-tonne machine, designed to meet the demands of super-large infrastructure projects, delivers a torque of 620 kNm and features a maximum drilling diameter of 3.5 meters.

It utilizes breakthroughs in multi-motor synchronization, transient heavy-load control and main hoist energy recovery (over 70%), improving overall energy efficiency by 5-10%.