National IV. XCMG QYa500 crane fully integrates advanced domestic and foreign design and manufacturing technologies, and has obtained national patents for a number of proprietary core technologies. As of October 31, 2022, it belongs to the National IV version of XCMG loaders. The loaders have been on duty for more than three months and have performed satisfactorily. They have efficiently completed all types of finished coal loading operations and shipped them across the country.