From the discussion so far it is obvious that two energy factors determine a crusher’s productivity:
(1) Total power drawn affects the quantity produced of any given size or range of sizes.
(2) The energy applied, previously defined as the crusher’s Power Rate (kilowatt hours per ton of feed) will determine the size reduction. This has just been clearly demonstrated by the pendulum tests.
In a previous paper, we have shown that the theoretical forces achieved in a crushing chamber are a direct result of the design geometry and driving power applied to the crusher. Machines from three manufacturers can theoretically apply different crushing forces to processed material, according to Table (1).
The energy intensity within the crushing chamber will differ for various machines. The wide range of eccentric throws and connected powers for various units will give different crushing impacts, which might be considered anologous to the pendulum. The angle of the mantle for the crushing head varies between manufacturers as does the length of the crushing zone from less than 200mm (8 inches) to more than 600mm (24 inches) but as has been indicated from the pendulum size distribution correlations it is the energy input to the feed material which determines the ….Read more