Getting the hang of it

LONG Ying Construction Engineering has become the first customer in China to purchase Sandvik Mobile Crushers and Screens’ QI442 HS, described as producing ‘highly accurate material reduction at high rates of throughput’ and, through the use of Sandvik’s modular hanging screen.

The QI442 HS supplied to Long Ying comes equipped with a range of features including a pre-screen, which Sandvik explained is fitted to ensure maximum scalping capability and to prevent any undersize material passing through the impactor, maximising throughput and reducing wear costs. This also allows a specific-sized product to be produced from the natural fines conveyor.

The pre-screen has a choice of grizzly or punch plate top deck and mesh bottom, while an under-pan feeder beneath the impactor protects the main conveyor belt from the material exiting the impact crusher. The QI442 HS can operate in either primary or secondary crushing modes. The two hydraulically assisted curtains can be adjusted to produce a range of product sizes.

One feature incorporated into the machine is an optional double-deck modular hanging screen system. This is interchangeable and allows the crusher to operate in open or closed circuit.

The hanging screen enables the machine to produce two screened products and recirculate the oversize back into the feed conveyor. The oversize conveyor may be hydraulically rotated for material stockpiling (90°) of up to three products on the floor, or removal (180°). The tail section can be raised hydraulically to give improved ground clearance for transport when loading or unloading.

Long Ying is using its machine to crush mainly construction and demolition waste with a maximum feed size of 800mm, producing two core products: 0-10mm and 10-40mm, at an average production rate of 200tph.