Crushing and Screening Tip #42 - Stopping Ring Bounce

How to avoid ring bounce with your mobile cone crusher

• Article reproduced from Striker

"Ring bounce is a function of the material being crushed. In some instances, the material will break up at the base of the crushing members and it is retained either by the crushing action or moisture or even by the effects of gravity. The crushing forces involved to achieve ring bounce have been calculated and therefore ring bounce should be avoided. This can be avoided by opening up the CSS.?

Ring bounce is a term that is referring to one of the issues that is caused by overloading a cone crusher. The cone crusher is made up of 3 main parts to a cone, the upper frame, the main (lower) frame and the head. The head is the bit that spins and does the crushing in the middle of the cone, the upper frame sits on the lower frame on an angled seat, sort of like a lid sits on a pan.

If the forces inside the crusher get too much, overload, you sometimes get the top frame bounce on the lower frame, this is what is referred to as the “ring bounce”.

The ring is like the area where the saucepan lid and the saucepan meet together.

There are however limits that the machine can work within. There are four important factors that have to all be considered at the same time Closed Side Setting, Power Draw, Ring Bounce and Choke feed.?"

If Ring Bounce is allowed to continue on a regular basis it can result in expensive repairs to the crusher.

Open the CSS (Closed Side Setting), screen fines out before the cone - it can also be caused by packing of clay in the bowl or by a lot of undersize material entering the cone.