The first stage of size reduction of hard and large lumps of run-of-mine (ROM) ore is to crush and reduce their size. Softer ores, like placer deposits of tin, gold, mineral sands etc. do not require such treatment. Large scale crushing operations are generally performed by mechanically operated equipment like jaw crusher equipment, gyratory crusher and roll crushers.
For very large ore pieces that are too big for receiving hoppers of mechanically driven crushers, percussion rock breakers or similar tools are used to break them down to proper size. The mechanism of crushing is either by applying impact force, pressure or a combination of both. The jaw crusher machine is primarily an compression crusher while the others operate primarily by the application of impact.
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The jaw crusher machines have various structures while their working principle are similar. This working manner of jaw crushing plant is hyperbolic extrusion, and its working principle is as follows. Through the motor's wheels, the eccentric shaft is driven by the belt and the belt wheel to make the jaw stock move by a regulated track. The angle between the toggle plate and jaw stock will become large as the up of the jaw stock.
This will push the moveable jaw plate towards the fixed jaw plate, which can realize the multi-crushing of the materials. The angle between the toggle plate and jawstock will become small as the down of the jaw stock. The moveable jaw plate will leave the jaw plate at the pressure of the tension rod and spring, meanwhile, the final products will be discharged from the discharge opening. Along with the continuous rotating, the crusher will complete the periodic crushing and discharging movement, which can realize the batch process.
1. Simple structure and easy maintenance.
2. Stable performance and low operating cost.
3. High crushing ratio.
4. Use high manganese steel, one-off foundry.
5. High resistance to friction, abrasion and compression with longer operating life span.