GB129631A - Process of and Apparatus for the Production of Metallic Powders. - Google Patents

Abstract

129,631. Odam, E. July 10. 1918, [Convention date]. Ball-and-ring mills.-In a process for pulverizing granulated or scrap metal in the cold by means of apparatus comprising balls rolling in races, the scrap &c. enters the apparatus axially and leaves peripherally, and is caused by centrifugal force to pass repeatedly between the balls and races, or in a modification, to pass through a series of apparatus. The process may be carried out in the mill shown in Fig. 3, in which the ring of balls f is arranged in races in a stationary plate v and a rotating plate a which is formed with a central sleeve b, arranged above a conical boss d on the plate v. The plate a is secured by a bar r to a driving-shaft p, engaged by a pressure-adjusting plate o which can slide on bolts r., provided with springs s and nuts t. The sleeve b is arranged within a casing h formed with a feedopening i and a discharge opening j. In operation, the casing and the sleeve b are filled with scrap &c., the openings i, j are closed, and the mill is started, the rotation of the plate a causing the material to pass slowly between the balls and to circulate in the paths indicated by the arrows f<2>, f<3>, f<4>. In the mill shown in Fig. 4, the material passes through two or more ball-and-ring apparatus u<1>, u<2> which are arranged at the bottom of conical hoppers h<1>, h<2> respectively and are driven by a common shaft p. The shaft is feathered to the rotatable plate x of the device u<1> and to a bar r<1> secured to the rotatable plate y of the device u<2>, a spring s<1> being arranged between the plate x and the bar r<1>.