As a crushing machine developed in the 1980s, it has been widely used in sand quarries, and is considered to be an effective sand making equipment by users. It is usually called a sand making machine. The impact crusher uses the diameter of the impeller as the standard to divide the specifications, and is divided into open type and closed type according to the impeller form. According to whether the shell is equipped with a counterattack, it can be divided into two types of crushing methods, namely stone-on-stone and stone-on-iron, so that it is combined into 4 basic forms. From an international perspective, the mature technology of Impact Crusher is reflected in three aspects: flexible mechanical properties, good wear-resistant materials and parts design, and effective dust control. For the domestic market, at least the first two are common. (A) technical performance The open impeller will allow 100-150mm feed granularity, and there is no commercial open impeller impact crusher available to the market in China. Therefore, the domestic vertical shaft impact crusher can only be used as a three-stage or four-stage crushing equipment in a sand and gravel yard, but not as a two-stage crushing equipment as abroad. Foreign companies have equipment with impeller diameters up to 1.6m and supporting motor power Shibang1103kW, which are suitable for various large production lines, while domestic impact crusher specifications rarely exceed 1.2m. Mature impeller channels can be changed between 3-7, with different structures and different speeds to adapt to different materials and feed grain levels, to achieve higher sand production capacity and the need for fineness modulus, and The domestic closed rotor is basically fixed to 4 channels and rarely changes, so the adaptability to different working conditions is poor.
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