With the rapid development of China's national economy, the comprehensive utilization of mineral resources and its industry develop rapidly. The material crushing is an indispensable process in the production in many industries (such as metallurgy, mining, building materials, chemicals, ceramics, road construction, etc.). In order to meet the requirements of a variety of materials, due to the physical properties of materials and structural differences, the mining machinery enterprises should produce different types of crushers. For the metal ore beneficiation, crushing is the first process of the concentrator. In order to separate the useful minerals, the crushing process can be divided into rough crushing, medium crushing and fine crushing. Since the crushing process consumes large amount of energy in the concentrator (about 50% of the power consumption of the whole plant), in order to save energy and improve production efficiency, the crusher develops towards energy-efficient direction of the fine crushing, grinding.In addition, with the development of industrial automation, the crusher is going forward the automated direction. For example, the foreign products have reached the hydraulic integration, continuous detection and automatically adjust the feed rate, discharge mouth size and crushing force. With the expansion of the scale of mining, the crushers are also developing towards large-scale. For example, the rough crushing gyratory crusher’s processing capacity has reached 6000th. The new principles and new ways of crushing (such as electrical, thermal fragmentation) is still in the research trials, it can not be used in the production yet. For coarse crushing, there is no new equipment to replace the traditional jaw crusher and gyratory crusher. We mainly use the modern technology to improve the machine to refine and improve the wear resistance and achieve energy-saving, high efficiency, long life purposes. There are more models in terms of fine crushing. Overall, the most widely used machine is the jaw crusher rather than the cone crusher.Traditional jaw crusher has the advantages of simple structure, reliable operation, easy manufacture, easy maintenance, low cost, and strong applicability, so it is widely used in the industry. The disadvantages are non-continuity crushing, low efficiency, small crushing ratio. For its shortcomings, many countries have improved the machine in the following aspects. Optimize the structure and trajectory to improve the crushing cavity to increase the crushing ratio and improve crushing efficiency, reduce wear, reduce energy consumption. The deep crushing chamber and smaller nip angle are widely used. We should improve the suspension type and lining support type of the moving jaw to improve the performance of the crusher. The jaw plate uses new wear-resistant materials to reduce the wear and tear. The level of automation has been increased. (automatically adjusts, overload protection, automatic lubrication, etc.)
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