Rotary kiln with planetary coolers

DETAILED DESCRIPTION The invention is thus directed to the problem of obviating the defects of the known constructions in developing a rotary kiln with planetary coolers of the type initially described, wherein with the material falling through only a small height, and more effective air supply from the flow aspect, there is provided a transition zone between the cooling tubes and the inlet tubes of a type which is simple to manufacture.
According to the invention this problem is solved in that the transition member comprises the wall of an inclined frustum extension of the inlet tube, whose imaginary circular base facing the cooling tube lies perpendicular to the cooling tube axis and whose side remote from the cooling tube is bounded by the wall of the inlet tube, and wherein surface lines of the transition member constitute tangents to the wall of the inlet tube.
With the transition member between each cooling tube and the corresponding inlet tube formed in this manner, deleterious dead spaces wherein the material can accumulate are avoided, as will be explained in detail with reference to an embodiment.
In this way one also achieves an air supply which is highly effective from the flow aspect.
A further particular advantage of the construction in accordance with the invention lies in the ease with which the transition member may be manufactured.
It may for instance be made by rolling from a single piece, which not only permits economical manufacture and the provision of high stability, but in addition because of the avoidance of corners and edges results in good adhesion of the refractory lining.