Rotary kiln of the pyramidal tube is made of steel plate into, the cylinder body with refractory bricks, and with the horizontal line into provisions rake, by 3 LunDai support on each block supporting device, in the near LunDai enters the material end across inner cylinder body with tangential spring-aids fixed a big gear ring, under which there is a pinion its mesh. The normal operation, the main drive motor of main reducer gear device to the open-cycle transfer the power to drive rotary kiln.

The basic components of a rotary kiln are the shell, the refractory lining, support tyres and rollers, drive gear and internal heat exchangers.

Kiln Shell:This is made from rolled mild steel plate, usually between 15 and 30 mm thick, welded to form a cylinder which may be up to 230 m in length and up to 6 m in diameter. This will be usually situated on an east/west axis to prevent eddy currents.

Refractory Lining:The purpose of the refractory lining is to insulate the steel shell from the high temperatures inside the kiln, and to protect it from the corrosive properties of the process material. It may consist of refractory bricks or cast refractory concrete, or may be absent in zones of the kiln that are below around 250°C. The refractory selected depends upon the temperature inside the kiln and the chemical nature of the material being processed. In some processes, such as cement, the refractory life is prolonged by maintaining a coating of the processed material on the refractory surface.

Tyres and Rollers:Tyres, sometimes called riding rings, usually consist of a single annular steel casting, machined to a smooth cylindrical surface, which attach loosely to the kiln shell through a variety of 'chair' arrangements. These require some ingenuity