Impact crusher is a new type of crushing equipment with high efficiency. The machine not only has large crushing ratio, fine and uniform product particle size, but also has low unit power consumption. The humidity requirement of the crushing material of the machine is not too big, and it is also suitable for any hard and brittle material, and can be used for the crushing of various minerals. And the unique design of the machine, the maintenance costs and maintenance costs of the machine are greatly reduced, so that the production efficiency of the machine is greatly improved, and the production cost is also significantly reduced. China's rich limestone reserves are an important material basis for the development of the domestic sand industry, with the country's investment in railways and highways increasing year by year, the number of limestone production lines around the country continues to increase, limestone mining industry has become an important part of the national industrial development. Limestone is a sedimentary rock composed mainly of calcite and can be divided into quicklime and hydrated lime (chemically called calcium hydroxide). It can be processed directly into stone or fired into quicklime. Lime and limestone are used in large quantities as building materials and are important raw materials for many industries. In modern industry, limestone is the main raw material for the manufacture of cement, lime, calcium carbide, is an indispensable flux limestone in the metallurgical industry, high-quality limestone after ultrafine grinding, is widely used in paper, rubber, paint, coatings, medicine, cosmetics, feed, sealing, bonding, polishing and other products manufacturing. The physical characteristics of limestone determine that it is a softer material, the impact crusher is the main machine of the limestone crushing system, the crushing chamber of the machine can effectively receive large materials and make it broken, and do not press the physical material, the crusher is not loaded. Impact crusher is a machine that uses the high-speed impact of the plate hammer and the rebound effect of the counter plate to break the material by repeated impact. The plate hammer is fixed on a high-speed rotating rotor, and several counterattack plates are arranged along the crushing chamber at different angles. When the material enters the action zone of the plate hammer, it is first impacted by the plate hammer and broken for the first time, and at the same time, it gains kinetic energy and rushes to the counter plate at high speed. After the material collides with the impact plate and breaks again, it is bounced back to the action area of the plate hammer and is impacted by the plate hammer again. This is repeated until it is broken into the desired particle size and discharged out of the machine. The impact crusher has been prominent in the limestone processing line for many years. In lime production, most materials need to be broken in order to create good conditions for the next step of pre-homogenization, storage, batching, grinding, drying, conveying and other processes.