24 Mar 2013, 10:32pm
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Impact Crusher

In the late fifties, our country has already designed the crusher, in the eighties, the domestic impact crushers are limited to process coal and limestone, and the other kinds of hard materials. until the former construction machinery factory introduced the KHD type hard rock impact crusher in the late eighties, which filling this gap. These two Crushers are fundamentally different in the cavity design, rotor structure, especially on the the hammer plate material and chucking method .the core parts-board hammer of our previously hard rock impact crusher mainly relied on import, but after listing it as the ministerial-level scientific research projects in the Eighth Five-Year Plan period, we obtained great success on this project, the domestic plate hammer not only replace imports, but also has been exported to Europe, America, Japan and other countries. The breakthrough of wear-resistant materials promoted the hard rock Crusher to get marvelous progress, which contribute to China s basic construction projects. According to statistics, in the highway construction of all provinces and cities, the Hard Rock Crushers have been adopted as the preparation equipment to crush the basalt, andesite and the other hard materials whose compressive strength to 300MPa achieves, The percentage content of the flakiness is less than 10%. For adopting the rapid development, the crushers our countries produced can be divided into coarse crushing, medium crushing and fine crushing these three kinds, and also be divided into being suitable for hard materials and medium hard materials these two different occasions, so that the combination of crushers achieves to a dozen of models to meet the different needs of the market. In contrast, Although there was a breakthrough in terms of hard rock crushing, varieties defections exists, specifications.from the market demand point of view, we should strengthen the development of the following product types. There are five methods to the grind solid materials, namely, extrusion, bending, splitting, grinding and impact.The first four use the static force, the final kinetic energy the applicate. In most crushing machine, the material is often crushed in two or more crush method, for example, in the gyratory crusher, the main applications are extrusion, splitting and bending; the main applications are impact and grind in a ball mill. With the development of science and technology, Chinese crushing machinery has obtained great development, especially in the 1990s, the crushing machines sale amount gradually increase, the technology gap between our country and the global decrease gradually. This situation of growth will promote this industry to a new high was.