Development Course of Hammer Crusher
Since the hammer crusher was invented in 1924, it only has over 80 years of history, but it has been developing very fast. Because the machine has many advantages such as high crushing ratio, even discharging granularity, low proportion of over grinding products, low energy consumption, low manufacturing cost and convenient maintenance, it has wide application in many industries of cement, building materials, coal, chemistry and metallurgy and mining.
According to the amount of the rotors, the hammer crusher can be divided into single rotor hammer crusher and double rotor type, and the single rotor can be subdivided in to reversible type and irreversible type.
Before the 1970s, the development of hammer crusher in our country has been very slow and it did not develop rapidly until recent decade and it has universal medium and fine crushing series, coal medium and fine crushing series and more than ten specifications. The irreversible hammer crusher is mainly used for medium crusher and the reversible hammer crusher is mainly used for fine crushing. In addition, there is also the single stage hammer crusher that is able to crusher the materials such as the limestone with the granularity of 1900mm into 25mm or smaller only once, so that it is able to simplify the traditional two-stage or three-stage crushing into single-stage crushing and saves a lot of infrastructure cost and production cost. In recent years, the ring hammer crusher which is mainly used for crushing coals is also developed and this type of crusher is a new type with advanced structure and it has more than ten specifications. However, until now, there is no double-rotor hammer crusher manufactured in our country and we can only produce the single rotor type.raymond mill:http://www.hxjq-crusher.com/11.html
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The model and specifications and the presentation methods of the hammer crusher are not unified and they vary in different manufacturing companies. The common presentation method is to use the phonetic letters and the diameter of the rotor D and the length L, among them, D refers to the all-round diameter of the end part of the hammer, and L refers to the effective working length of the hammer arranging along the axial direction.
The universal hammer crusher can be used in the industrial departments of metallurgy, coal, building materials, chemistry and power station, and it is suitable for crushing all kinds of brittle materials like limestone, feldspar, coal, salt, brick and tile, gypsum and gravels. The compression strength of the crushed materials cannot exceed 150MPA, and the surface water content should be lower than 2%. The coal hammer crusher is mainly used for crushing brittle materials like coal and gypsum whose compression strength is lower than 12MPA and the surface water content is lower than 9%.
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