According to different materials, it can be divided into cement kiln, metallurgical chemical kiln and lime kiln. Cement rotary kiln is the main equipment of cement clinker dry and wet production lines. Rotary kiln is widely used in metallurgy, chemical industry, building refractory, environmental protection and other industries. The cement rotary kiln is composed of cylinder, supporting device, supporting device with retaining wheel, transmission device, movable kiln head, kiln tail sealing device, coal injection pipe device and other components. The kiln body of the rotary kiln is inclined to the horizontal to a certain extent. The whole kiln body is supported by the supporting wheel device and has a wheel stop device to control the up and down movement of the kiln body. In addition to the main drive, the transmission system is also equipped with an auxiliary drive device that can still rotate the kiln body and prevent the bending and deformation of the kiln body when the main power supply is cut off. The sealing devices at the kiln head and kiln tail adopt advanced technology, The reliability of the seal is ensured.