| 摘要 |
<p>MILL CONSTRUCTION An improved mill structure is provided by means of a substantially cylindrical drum rotatable about its longitudinal axis on a pair of axially spaced trunnions. The drum is made of a cylindrical shell portion with a pair of cylindrical reinforcing ring portions concentric therewith and extending axially one from each end of the shell portion. The ring portions axe of greater thickness than the shell portion. The ends of the drum are connected by heads to the trunnions and the axial end of each of the ring portions remote from the shell portion are in a butting relationship with the inner face of the adjacent one of said heads and are connected thereto by connecting means spaced circumferentially about the head and extending through the head and secured to the adjacent of the ring portions thereby to connect the ring portions to their adjacent head. Each of said ring portions extend from the adjacent head by a distance such that the peak stress applied to the area of the junctions between the heads and the cylindrical body portions are accomodated within the thick ring portions.</p> |
