The Rotary Kiln is the key equipment of cement clinker dry -process and wet -process production line, and is also used in various industries such as metallurgical , chemical industry ,building refractory ,environ mental protection industry , etc . The kiln is composed the cylindrical shell ,roller supporting device ,supporting device with thrust roller ,driving gear unit moveable kiln head ,sealing device at kiln inlet ,coal dust pipe device etc. The kiln shell is designed to keep some inclination to level .It is supported by the roller supporting device and equipped with thrust roller device to control the up and down moving of the shell .The driving system is equipped not only the main driving gear unit but also the auxiliary driving used to keep the shell rotating even when the main power is broken so as to prevent the shell from any bending and distortion .As the kiln head and tail are sealed by advanced technology ,the sealing of the kiln is fairly reliable.