1. Common broken machinery of the top-five, counter-breakers and hammer crusher belong mainly to the impact of brittle materials to broken machines, it is often referred to as the impact crusher. Impact crusher with a compression-based breakers, such as the jaw, Park and roller cone crushers, and other than the following characteristics:

A. Broken ratio. Impact crusher broken more than 50 can be achieved, and jaw, Park and roller cone crusher to more than 20. Therefore, in need of single broken occasions, such as broken limestone cement industry, the impact crusher use is widespread.

B. Particle good product. Under the impact, was broken along its materials are often the most vulnerable level fragmentation, this selective broken, the particles form a cube the probability of a higher, the impact crusher machine needle products can be low in percentage Flake 10%, and jaw, Park and roller cone crusher products such as needles Flake percentage content will be higher than 15%. Thus, the need cube particles occasions. For example, the non-slippery highway pavement, usually impact crusher used as a final break equipment, the production of concrete aggregate.

These characteristics, the impact crusher in numerous broken machinery occupy important positions.

2 However, due to the impact crusher principle is broken by the impact of materials, their anti pieces, such as: hammer, hammer plate, plate counterattack, in a very short period of use and wear. Such deficiencies in the long term, the impact crusher limit the scope of application. Hard materials can only be used in the crusher. In the early 1950s, with the application of new wear-resistant materials, Germany KHD company first launched counterattacks hard rock crusher, breaking the limitations of this type, this improved version of the current model is still in production.

China in the late 1950s has come out counter-breakers, in the 1980s, the domestic counter-breakers confined to the processing of coal and limestone in such hard materials. Until the late 1980s when the former Shanghai construction machinery manufacturer to introduce counter-KHD-hard rock crushing machine, fill the gaps. But behind abroad more than 20 years. Figure

 

1, shown in two two-crusher in counter-shaped cavity design, rotor structure, especially in the board materials and equipment hammer card method is fundamentally different. Domestic counter the hard rock crusher, at the beginning, its core components plate hammer dependence on imports, the domestic plate hammer in the "Eighth Five" during a ministerial-level scientific research projects, the success, not only of domestic plate hammer replace imports, but has also been export huge quantities of Europe and the United States, Japan and other countries. Wear-resistant materials breakthroughs have led to hard rock crusher to redouble their might counterattack, only Shanghai Road and Bridge Construction Machinery Co., Ltd. (hereinafter referred to construction firms) as an example: 10 years, hard rock-crushing machine counter sales growth 15 times. 10-fold increase in exports to China's contribution to capital projects.

 

For example: China's Ministry of Communications to improve the quality of highway construction, raised pavement concrete stone crusher station projects, and included in the national "Eighth Five" key project. Preparation of the project equipment in the Northeast use of a site failure. And users to switch to hard rock crusher counterattack after the production of stone, in full compliance with non-slippery highway pavement concrete demands.

 

So hard rock crusher counterattack reputation his colleagues. Liaoning Provincial Communications Department, transferred possession of such equipment, as a bid for highway construction prerequisite. According to statistics, in the country's provinces and cities have been used in highway construction counterattack hard rock crusher stone by the road system as a device to the compressive strength of 300 MPa broken basalt, andesite, and other hard materials, and reached 19.6 mm below the level with stone.

 

Flake percentage of its needles in less than 10%. At present, there are more than 400 in use around Taiwan, in addition to solving the expressway construction in a dilemma, but also block the imports, as a hard rock crusher counterattack the leading manufacturing enterprises, the Shanghai construction firms also gained, Hard Rock counterattack Breakers have three series of dozens of specifications. Figure 3 shows the standard. Figure 4 shows the derived type Ⅲ, allowing feed size of 600 mm, applicable to the reinforced concrete broken. Figure 5 shows the V-type derivatives, in both full-board increase, a material change in the distribution of particle size, increasing the proportion of fine materials.