Rotary drum dryer, also known as drum type drying machine at present in cement, chemical industry, agriculture, building materials, pharmaceuticals and other fields has been very widely used, the technology also more hasten is mature. The main role is used for drying operation of equipment, by heating the material moisture (generally refers to water or other volatile components of liquid vaporization of escape, to obtain ideal moisture content of the solid material and drying is to use of materials or further processing. The equipment is mainly composed of a cylinder, a lifting device, a supporting device, a transmission device and a sealing device. Dryer gear (gear) is the main transmission components of equipment of drum dryer is critical to the installation of its quality is good or bad and correct and reasonable. Various connection modes cause various structures, and the spring plate structure and the flange structure are commonly used. The assembly method is similar to the rotary kiln. The modulus and