Optimising Jaw Crusher Performance Focus on Feed

Jaw crusher is generally the primary crushing equipment of the whole production line, and its efficiency has a great influence on the production line. The main purpose of jaw crusher is to reduce the feed material to a small enough size that it can be transported by conveyors to the next crushing stages. Feeding is the first step in crushing and following the proper feeding practices not only increases component wear life but improves the productivity and efficiency of the entire production line. Improper feeding is a major cause of slowdown and production capacity gaps.

In-line feeding

Jaw crushers should only be fed in line with a feeder or scalping screen. This means the discharge end of the feeder should align with the feed opening or gape of the crusher. In-line feeding limits opportunities for the material to clog the jaw crusher.

Choke feeding

Jaw crushers should be routinely choke fed to maximize the production capacity. Choke feeding results in stone-on-stone crushing, which can help break apart more flaky materials. Jaw crushers work best when the entire crushing chamber is used for material size reduction. Choke feeding a jaw crusher maintains a crushing chamber that is at least 80% full. This will help to draw the material down into the crushing chamber, as well as create a better material shape and improve overall efficiency.

However, choke feeding also often results in a finer output. Trickle-feeding material into the jaw crusher could achieve fewer fines and result in larger products but this would have an adverse effect on particle shape, and it also reduces throughput capacity, hindering the crusher’s efficiency.