Investigation of High Speed Cone Crushing Using Laboratory Scale Experiments and DEM
Övrigt konferensbidrag, 2015
Cone crushers are commonly used in secondary and tertiary crushing stages in comminution circuits. A multitude
of factors and variables influence the performance in terms of throughput capacity, size reduction, power draw and wear.
Crushers are normally installed and operated at a fixed eccentric speed setting. By installing variable frequency drives and realtime
optimization algorithms Hulthén and Evertsson have shown that the eccentric speed can be used as a variable to optimize
the yield and improve the performance. However, the influence of eccentric speeds above the normal operational range has
been scarcely reported on in the literature.
This paper aims at reporting on the result from an exploratory study where experiments and simulations have been used to
evaluate cone crusher operation at high eccentric speed levels ranging from 10-40 Hz. A laboratory Morgårdshammar cone
crusher has been refurbished for the purpose of the study. A preliminary set of experiments have been performed where results
showed that the chamber geometry has a vital importance. The same behaviour as observed in the experiments was also further
understood by using DEM simulations leading to the design of a new chamber geometry.
The new chamber design have been evaluated using DEM at four eccentric speeds and two different close side settings. The
rock model has been calibrated by single particle breakage experiments and is based on the bonded particle model. The product
particle size distribution has been estimated by image analysis of the bonded cluster discharge. The work addresses and shows
results relevant to three areas in comminution and engineering research; Simulation driven design, DEM modelling, Cone