Crushing Machinery:The Past And Present
In China,retro jordan sale, there had been the most simple crushing tool--ball and socket in 2000 BC. From the 200 BC to 100 BC,the crushing machinery--ball and socket further evolved into the foot pestle. These tools using the leverage were the initial prototype of the crushing machine, but their action was still intermittent crushing.

The earliest crushing machine with continuous crushing action was invented by the Lu Ban living in the late Spring and Autumn Period. The other with continuous grinding action was the roller grinding machinery, it appeared later. 200 AD later, Du Yu and other Chinese had developed the water-mill based on the foot pestle, and the water was the driving force, which improved production efficiency to a new level. These machines were used for grain processing, but also extended to other materials on the crushing operations.

Modern crusher had been created after the gradual improvement of steam engine and electric motors. In 1806 there appeared steam engine-driven roller crusher. In 1858, Blake, in the United States, invented the jaw crusher. Rotary crusher was developed in 1878, the production efficiency was higher than the jaw crusher with intermittent crushing action. In 1895, American William invented impact crusher which was lower energy consumption.

Meanwhile, the grinding machinery also had a corresponding development. In the early 19th century, ball mill had been widely used. Rod mill with uniform size of the discharge was invented based on the development of ball mill in 1870. In the 1930s, Americans and Germans had developed a roller bowl mill, roller mill and other vertical shaft mill.

With the development of technology, so far crushing machinery development has made considerable progress. Especially after the 1990s, crusher production and sales increased rapidly, while the number of enterprises continued to increase. These enterprises could produce 30 ton vibrating crusher, 24 ton static roller crusher and 30 ton tire crusher and other range of varieties of products. They had self-development and production of complete crusher manufacturing system, and the gap with international advanced level was gradually narrowing. Therefor, crushing machinery industry was entering a new period of development.

In the twenty-first century, there are a group of outstanding enterprises in the crushing machinery industry. In these companies,air jordans 2012 outlet, you can see the latest development of crushing machinery,jordans 4 high heels outlet. A lot of experts who are dedicated to advanced research and development of crushing equipment have developed crusher with international technical standards,retro jordan outlet. Some high-quality products are as follows: jaw crusher, impact crusher, cone crusher, mobile crushing plant,air jordans evolution 85 sales, high pressure suspension grinder, sand making machine, and the production line with the feeder, vibrating screen and a full set of aggregate conveyors.
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