Mobile and semimobile crushing, screen- ing, washing and materials handling equipment supplier Pilot Crushtec International has delivered a Sandvik UJ440i heavy-duty mobile jaw crusher to South African crushing specialist Danoher Contracting.

The customer urgently needed a high-capacity machine at Cape Town-based construction company Haw & Inglis’ site, on the N10 between Cradock and Cookhouse.

For a South African National Roads Agency Limited project, which involves the upgrading of 40 km of degenerated road, Haw & Inglis subcontracted a substantial portion of the crushing component – the supply of 160 000 t of subbase material – to Danoher Contracting.

According to Pilot Crushtec national sales manager Nicolan Govender, the R8.3-million machine was functioning reliably “in the minimum possible time”.

“The Sandvik UJ440i docked in Durban on March 12 and arrived on site on March 16, accompanied by installation manager Kobus Joubert and Sandvik product manager Peter Delbrant, from Sweden.

“The entire installation and commissioning process was completed without a hitch and, by that Saturday afternoon, the crusher was fully operational,” says Govender.

Since its arrival, the Sandvik UJ440i has been consistently crushing blasted dolerite with a maximum feed size of about 500 mm.

The crushed material is fed from the Sandvik UJ440i into a cone crusher supplied by anther manufacturer. The two units are working well in tandem, producing 250 t/h 24 hours a day.

Govender, however, is convinced that output could reach the 300 t/h with the addition of a higher-capacity screen.
“These two pieces of equipment working efficiently in tandem is possible because of communication using a downstream cable connection. When the secondary crusher senses an overload, this is signalled to the Sandvik UJ440i and the feed rate is immediately halted or reduced.”

The Sandvik UJ440i is powered by Volvo’s low-revving D 13 Stage 3b diesel engine, delivering 315 kW of power directly to the jaw crusher through V-belts.

“The average fuel consumption recorded on site after nearly two months of continuous operation is 31.8 ℓ/h, an astonishing performance for a machine of this size and produc-tion capacity,” says Govender.

Danoher Contracting’s Neil Danoher says the company is satisfied with the performance and the economy of the machine. “It is crushing a difficult material, while meeting our production targets and handling the job well.”