Dedicated design

In today’s market it’s important to optimize both performance and durability. “The price of metals is very high right now,” says Torbjörn Nilsson Wulff, Sandvik product line manager for mining cone crushers. “Mining customers want higher performance and higher durability from cone crushers. This way, every operational second is utilized to the fullest and the time lost for unplanned maintenance is very low.”

But even without high market prices, performance and durability in cone crushers have always been keys to improving productivity. “Mining companies always want to maximize output and minimize downtime,” Wulff says. “If you do not have enough size reduction in the crushing stage, you end up with material circulating instead of going out as product to the next process stage.” This issue has inspired the development of the Sandvik CH890 and CH895 mining cone crushers. Both cone crushers are unique because of their specially designed, strength-optimized topshells and dedicated crushing chambers.

Previously, secondary and tertiary crushers have worked off a single design. The CH895 is dedicated to tertiary and pebble crushing applications. The increased crushing force of the design facilitates higher reduction, finer product size and less circulating load in closed circuits. Meanwhile, the CH890 is dedicated to secondary crushing applications, and with a 1,000-hp motor it can utilize maximum throw at all times – increasing capacity while maintaining product size.

“With the CH890, customers can either increase the throughput with the same suitable product to fit the tertiary stage or increase the reduction to make more ready product also from the secondary stage crushing,” Wulff says. Apart from their topshells, the CH890 and CH895 are identical in design and construction, incorporating a mainshaft made from a new high-strength material designed to withstand the toughest treatment and supported at both ends to better absorb the crushing force and increase durability. To further increase performance, the unique Sandvik Hydroset™ and ASRi™ systems are in place to allow online adjustment during a full load.

“The online adjustment means that the crushers are utilized 100 percent without exceeding the maximum parameters,” Wulff explains. The CH890 and CH895 bottomshells are also optimized to take greater loads than previous models, and the screw joints have been further developed to maintain the rigid Sandvik unibody structure. Other design features of the CH890 and CH895 cone crushers include a relocated external dump valve for quicker and safer access and a new over pressure system to keep the lubrication oil clean and thereby increase time between services. These improvements are both aimed to minimize downtime.

Åke R Malm

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