Page 54 - Hub-4 Magazine Issue 59

Quarrying
Efficient use of cone
crushers - how users
achieve optimum results
A cone crusher is often used in the second to third crushing stage and operates according to the pressure crushing principle. It is suitable primarily for use in medium-hard to hard and abrasive natural stone and in mining applications. In the second and third crushing stage cone crushers produce a very high final grain quality.
However, perfect results can only be achieved with optimum
 Adapt the processes in case of overload.
Overloading of the crusher is characterised by strong movements on the bowl and by briquetted material on the crusher discharge conveyor. Prior to feeding, the feed material must be pre-crushed to make it smaller or fine material must be prescreened. If necessary, the crushing gap must be increased. An increase in speed can also have a positive effect.
operation of the crusher. Apart from the selection of the correct crushing tool, there are a large number of variables that influence the crushing capacity of a cone crusher. The following points must be observed in order to operate a cone crusher efficiently and reliably.
 Avoid fines.
When fine material is fed in, tool wear and the crusher load is significantly higher than with prescreened feed material. Therefore activate the primary screening at the upstream jaw crusher or, alternatively, position a screen
Do’s machine before the cone crusher to separate fine material.  Fill evenly and avoid running empty.
A material layer should always be present in the feed hopper because this reduces wear. Avoid overfilling and ensure that filling is even because this guarantees a constant load and prevents serious fluctuations. Your process and plant run more stably.
 Observe the maintenance and inspection intervals.
Regular maintenance and observance of the inspection intervals increase plant availability and thus the productivity.
 Monitor the process regularly during operation.
Regular monitoring allows operators to detect overloads in good time and to adapt process parameters. Overfilling of hoppers must be avoided, also in the case of material return sections.
 Prior to starting: check the process.
Before using in a new application, you have to check whether the installed tool is suitable for the task and which crushing gap can be operated. Process simulation can provide support in this area.
Dont’s
 Avoid loading wet and sticky feed material.
This can lead to a blockage of the crushing process which, in turn, increases the risk of overloading and permanent damage to the crusher.
 Observe the correct feed size.
Feed sizes that are too large or too small can both have negative effects on the process and can damage the cone crusher. Select the tool to match the feed size and the final product and adapt the feed size to match the tool. Ensure that only material of the same type is loaded and avoid gap grading.
Continuous Feed System This system monitors the crusher fill level with a sensor and automatically controls the supply of the feed material.
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www.hub-4.com November/December 2019 - Issue 59