The Blake crusher was patented by Eli Whitney Blake in 1858. The Blake type jaw crusher has a fixed feed area and a variable discharge area. Blake crushers are of two types- single toggle and double toggle jaw crushers. In the single toggle jaw crushers, the swing jaw is suspended on the eccentric shaft which leads to a much more compact design than that of the double toggle jaw crusher.
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Methods used in Crushing & Screening Plants on ore range from a simple combination of a grizzly and one crusher to an elaborate arrangement in series of grizzly, jaw crusher, screens, and rolls or cone crushers. Crushing is done underground at a few large mines.
Jaw crushers are the most common solution in underground applications when the throughput is less than 1000 tons per hour, depending somewhat on the scalping solutions. Above 1000 tph primary gyratory crushers begin to look interesting, and after the throughput reaches 2000 tph, jaw crushers are very rare, with the exception of a parallel plant layout.
Scalping is recommended for a jaw crusher for three main reasons: Capacity increases when material below the crusher setting bypasses the crusher; also the energy consumption is lower. The life of wear parts increases; a jaw crusher usually wears more manganese steel per crushed ton than a gyratory crusher.