Metso’s research and development has taken its line of cone crushers to the next level, with the Nordberg MP1250. This crusher provides up to 30% more capacity as a result of advanced crushing dynamics, while increasing the horsepower to 1,250 HP. This is achieved with an installation that uses the same footprint as the MP1000, which means greater productivity without additional expense.
The MP1250 has nearly a dozen key features and benefits that include: a redesigned mainframe for improved durability; a new eccentric design that provides improved surface finish and protects the eccentric in the event of overload; and a new head bushing design that further reduces head spin during no-load operation without the need for a mechanical clutch assembly.
Design improvements in the mantle locknut make maintenance quicker and easier, and there are also upgrades in the hydraulic tramp protection system, bowl adjustment and removal, and faster hydraulic repressurisation times. An advanced gradation autosetting system eliminates the need for frequent calibration and continually monitors product size for more consistent crushing and output.
Easier maintenance is achievable with bolt-on counterweight liners; a new head-nut or locknut that only requires common hand tools to replace; fewer accumulators to charge and monitor; fewer adjustment motors to service; and faster bowl removal.
Improved eccentric design reduces bushing wear during reduced feed conditions. Robust design of the fullymachined sleeved eccentric provides less wear and more protection in overload conditions. A new tramp system provides better protection from mechanical overload, and new drive ring pads provide longer life.
Users of the existing MP1000 cone crusher can apply the company’s MP1250 retrofit kit for upgrading to highthrow and high pivot point. The kit includes a new sleeved, highthrow eccentric; large counterweight with bolton guard; upper head bushing; head ball; and socket liner.