Impact crusher is a new high efficiency crushing equipment, which is characterized by small size, simple structure, large crushing ratio ( up to 40 ), low energy consumption, large production capacity, product with uniform particle size, and selective crushing effect. It is a promising crushing machinery. But its biggest drawback is that the plate hammer and impact plate wears easily. Especially the impact crusher is used for crushing hard rock, the wear is more serious. So they need replacing frequently. At present, due to a number of wear-resistant materials, the situation has been improved a lot.After the reform of Rotary dryer, output capacity of the machine has greatly improved and the energy consumption has reduced as well. But the reform effect of some manufacturer is not ideal. As a leading enterprise of mining machinery manufacturer of China, our company has strong technical force and powerful production capacity and can produce aggregate crushing, cement equipments, chute feeder, compound cone crusher, flotation machine, etc. There even appear many problems which should not emerge such as cylinder lined with quick wear, filling tube and dryers head easily burnt out, shorten service life of bag filter and so on,leading the high cost of maintenance and affecting the normal production of the rotary dryer. But the all problems that are mentioned above are not caused by the technical reform. The application of modern mechanical and electrical integration of technology and modern control methods ( such as hydraulic technology, electronic technology ) has continuously improved the degree of automation of the impact crusher, which reduce labor intensity of workers and improve productivity. For example: the application of modern computer aided design optimizes the structure parameters of impacting frame, which improves the energy utilization rate and the crushing rate of the ore.dry process rotary kiln: http://www.hxjqmining.com/pro/cemen_rotary_kiln.html