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The development of concrete and rock crushers

Posted on August 22, 2012 05:09 AM, in nicole009py

The development of concrete and rock crushers

The earliest versions of concrete and rock crushers involved the use of two rocks being slammed against each other. An anvil was formed by one rock, while the weight of the other was used through manual power to achieve the necessary crushing. A crusher that was called the Cornish stamp was developed in the 19th century for breaking up tin and was used in mining.  A cone crusher of 48 inches developed in the 1960's had a capacity to crush 170 tons of rock. The present development in technology has led to the same size of crusher being able to crush 300 tons of rock. The design of the cone crusher remained the same, but higher speeds and stronger chambers used in the crushers helped to increase the output.
The breakthrough in crusher design came from the hydraulic relief system that is a comparatively recent invention. This has helped to increase the life span of the crusher and also reduce its down time when repairs are necessary on the equipment. This in turn increases profit as well as productivity. Hydraulics is an invention that allows hard material like concrete to be crushed without any damage to the machinery and made for a major breakthrough in equipment for crushers.
Crusher is the exclusive compound content of particles larger than 3 mm of the total emission rate 50% or more of the crushing machine. Operations often broken by feeding and nesting into coarse grain size of the broken, the broken and petty. Way under the crushing force of the crusher can be roughly divided into two categories: (1) crusher; (2) grinding machine. Breakers general handling larger pieces of material, coarse granularity, usually greater than 8 mm. Its structure is characterized by a certain gap between the broken pieces, not touch each other. Crusher can be divided into coarse crusher, the crusher and fine crusher. Generally speaking, grinding machines, material handling smaller, product size is fine, up to 0.074 mm, or even more detailed. The structure of a broken part (or media) are in contact, the medium used is steel balls, steel bars, such as gravel or mineral block. But some machines are also both crushing and grinding effects, such as from the mill. ∮ 5. 5 × 1. 8 ç±³ mill processing ore from the upper limit of up to 350-400 mm in size, product fineness can reach about 40% -200 purpose.
 

Tags: the, development, concrete, and, rock, crushers

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