Impact crusher under impact crushing materials often fragmentation along its most vulnerable level, the probability of this selective fragmentation method, the particles are cubic form higher percentage of flakiness, so the impact crusher products content can be less than 10%, while the jaw crusher, cone crusher and roll crusher flakiness percentage content of the product will be 15 percent higher. Impact crusher crushing materials with impact principle, blow to pieces, such as: hammer, hammer, counterattack plate wear in use is very fast. This deficiency in quite a long time, limit the scope of the impact crusher. Can only be used for the crushing of hard materials.
In the eighties, the domestic impact crusher limited to the processing of coal and limestone, hard materials. Until the the original construction machine factory in the late eighties introduction KHD type hard rock impact crusher, fill the gaps. But behind decades abroad. Domestic hard rock impact crusher, the beginning of its core parts board hammer dependence on imports, as a ministerial-level scientific research projects the localization board hammer in the Eighth Five-Year Plan "period, after the success of the project, the domestic plate hammer not only replace imports, and has a large number of exports to Europe and the United States, Japan and other countries. The breakthrough of wear-resistant materials, hard rock counterattack crusher unleashed just building Luqiao Machinery Co., Ltd., for example: decades, Hard Rock Crusher sales growth of 15 times. Exports increased by 10 times, to make contributions to China's basic construction projects. Example: to improve the quality of China's highway construction, the Ministry of Transportation has proposed the pavement concrete stone crushing station research projects, and included in the national "Eighth Five-Year Plan" key project. The trial of the project equipment failed in northeast a site use. Users to switch to the Hard Impact Crusher production of stone, in full compliance with the motorway slip road concrete requirements. So the Hard Rock Impact Crusher reputation has been boosted.
Provincial Communications Department once have this equipment, as necessary conditions of the tender to undertake road construction. According to statistics, in the highway construction in the provinces and cities have been using the Hard Rock Impact Crusher preparation equipment as pavement stone crushing compressive strength of 300MPa basalt, andesite and other hard materials and gradation 19.6mm below stone. Flakiness percentage content of less than ten percent.
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