Apron settings can be infinite and its entirely up to you, the operator, as to what size and when you set the apron gaps. If you have 2 or 3 impact aprons it makes a difference as does the type of material you are crushing.
Impact crushers differ from jaws and cones in the fact they impact the rock and don’t compress the rock. So it is important we all make sure we actually understand the term ‘impact’.
Impact definition: ”The action of one object coming forcibly into contact with another”.
60% of the crushing in an impactor will be done on initial impact with the blow bars and the primary apron. Then the secondary apron will do 30% and finally the tertiary apron kicks in and does the final 10%.
Back to the primary setting. If you squeeze that down and close the gap up you will reduce your production. This is because you are reducing the volumetric capacity of the crusher. Make sure that when you are starting you open up the primary arm and give the crusher a chance to do its job, then start to play with the secondary and tertiary arms.
The conjecture comes when we talk about the tertiary apron. Not all impactors have them and some have whats called a grinding path. That is where a lot of money can be spent…. grinding.
Grinding definition: ”Reduce to a powder using friction or to rub two surfaces together forcefully.”
That takes us back to the first point, impact crushers should crush using impact force. Adjust your apron accordingly.
If you need any help with application specific apron settings give the team a call +61 8 6444 7917.