The rotary kiln is an important production equipment in some industries areas such as the cement, building materials and metallurgy. Its technical performance and operation situation determine the enterprise product's quality and cost to a great extent. As the rotary kiln tilt installed in the roller device and the roller suffered from the full weight of cylinder, the cylinder and roller can produce the axial force because of its own gravity.Meanwhile, between the tyre and roller with friction also make rol...