Sandvik has expanded its mining cone crushers, releasing two new mid-range models.
The new CH860 crusher is designed for high capacity secondary crushing, while its other new model – the CH865 – has been built for high-reduction tertiary and pebble applications.
According to Sandvik both crushers feature a range of advanced automation features as well as higher crushing forces relative to mantle diameter, and a 500kW motor.
The crushers were field tested for around one year in a Chinese iron ore mine.
Andreas Christoffersson, the product line manager for cone crushers at Sandvik Mining, explained how "“we scaled down our larger Sandvik CH890 and Sandvik CH895 mining cone crushers to create two mid-range models that are even more productive, robust and reliable, and feature enhanced environmental, health and safety characteristics".
He went on to state that "depending on the application Sandvik CH860 and Sandvik CH865 outperform competing equipment in the mid-range segment by as much as 30 per cent and deliver a two-fold increase in performance range”.
The new crushers have been designed with intelligent systems that allow for real-time performance optimisation, and with a more compact build to reduce dynamic load which in turn reduces engineering and installation work.
"The crushers feature fewer moving parts than competing models," Sandvik added.
"Non-welded, bolted liners on the top and bottom shell also enable safer, easier maintenance."
Both new crushers also feature the company’s ASRi (Automatic Setting Regulation control system) and Hydroset to ensure automatic operation at peak performance around the clock.
ASRi constantly monitors pressure, power draw and mainshaft position and automatically adjusts the setting during full load.
The Hydroset main shaft support system provides protection from overloads by permitting tramp iron and other uncrushables to pass through the crusher before automatically returning to the original setting.
The system automatically compensates for crushing chamber wear to provide consistent product size.
“Hydroset enables us to incorporate our unique PLC-controlled electric dump valve for tramp iron protection, which significantly reduces pressure peaks and mechanical stress on the crusher, greatly improving reliability,” Christoffersson said.
“In these challenging times mines are often looking for increased productivity without necessarily expanding their plant,” he said, "the CH860 and the CH865 are easy to install as replacements to achieve this. In the test site we replaced a similar sized crusher, on the same foundation, to greatly increase final product and significantly extend crushing chamber liner life. The electric dump valve repeatedly proved its tramp iron protection value, reducing costly unplanned breakdowns.”