The agronomic technology of whole plastic-film mulching on double ridges has been widely promoted in the arid region northwest China, which caused serious residual film pollution field. Mechanized collecting is main way, but this way more complicated. To prove effect typical film-lifting parts performance by a numerical simulation method, further evaluate and select working suitable for improve...

The operation quality of shovel-truck systems (STSs) at open-pit coal mines in the summer and transitional autumn-spring periods differs markedly. This is due to a decrease speed haul trucks during season compared season. leads an increase travel time trucks. Shovels must work longer ensure planned volumes loading transportation required number hauls. Consequently, duration working shift (or da...