Rotary cylinder is a matrix. Tubular body should have sufficient rigidity and strength to maintain the installation and operation of linear and cross-sectional axis of the roundness, is directly related to the extension of the life of the rotary kiln brick lining, reducing running resistance and power consumption, reduce uneven wear reduce mechanical accident, to ensure long-term safety and efficient operation. Stiffness of the cylinder barrel is mainly transverse cross-section in a huge force to resist radial shear deformation (figure below) capabilities. Transportation, installation, bricklaying course China, also called cylinder has sufficient stiffness in operation at each point on the cylinder radial deformation values ​​are changing, too large radial deformation, will inevitably lead to loosening of the internal lining brick, affecting life. Tests showed that the radial deformation of the cylinder at the fulcrum (i.e. rolling circle) is the maximum, to the inter gradually decreases decay rate with the cylinder diameter ratio of the thickness of the increase of speed. The strength of the cylinder to the cylinder in question showed cracks under load, in particular a cylinder near the rolling circle. Memory in the cylinder tests showed that a relatively large stress, the value of hundreds ke/cm2, shear stresses greater than the axial stress. In the load stress and inevitable welding stress together, eventually leading to cracks. Assurance and maintaining the cylinder axis linear manufacture, Rotary Kiln installation, use and maintenance tasks. Even if the installation is very accurate, after a period of operation, based on uneven subsidence may occur, prop shaft watts, roller, roll Quannei Wai round wear, everywhere can make a large change in temperature of the cylinder in the center of the fulcrum position difference. Must be in the maintenance, in accordance with the operation of the kiln, right axis for inspection and correction. From the developed to the full cylinder riveting welding. Caulking the cylinder and a series of disadvantages, such as riveting process complexity, easy to loose rivets, resulting deformation of the cylinder, local bricks off, resulting in "red kiln" accident. Rolling circle next multi-layer steel cylinder with riveting, hard layers good fit. Cylinder body surface is not smooth, bricklaying work to cause difficulties, poor stability brick lining. Riveted structure, the vertical and horizontal joints are lap plate, with rivets, would increase cylinder 20 to 25% by weight, and the manufacturing workload. With the improvement of welding technology and rolling cylinder capacity strengthening, has been designing and manufacturing riveting longer barrel. Please indicate Henan YuFeng Heavy Machinery