Patent GB-229056-A (GB)
Title: An improved combined crushing, pulverizing and separating machine
IPC: B02C13/13
Filed: 1924-01-07
Abstract: 229,056. Ateliers RÚunis, and Hippert, F. Jan. 7, 1924. Impact pulverizers; mills of unspecified type combined or fitted with separating-apparatus.- A combined crushing, pulverizing, and separating machine comprises a crusher, preferably of the percussion type, wherein the egress of the whole of the pulverized materials mixed with the air forming a primary air draught driven out centrifugally by the movable crusher-members takes place in the neighbourhood of the circumference described by the hammers through an annular opening in the wall of a cavity in the form of a fan casing positioned rearwardly of the hammers, the duct leading from the cavity being flattened at its open end to distribute the material in the primary air draught in thin layers, and a separating-device which receives the primary air and pulverized materials and is connected with a suction fan to create therethrough a secondary air draught which meets the primary air draught and causes the pulverized materials to be separated therefrom. As shown, an annular concentric opening 3, Fig. 1, is arranged rearwardly of the crown 2 of the crusher 1 with its inner diameter slightly less than that of the longitudinal flutings on the inner surface of the crown, and behind the opening 3 is provided a cavity 4 which may be in the shape of a fan casing to collect and direct the mixture of air and pulverized materials. A fan turbine with blades 15 accelerates the circulation of the mixture through the cavity 4 and through a duct 5, having a throttled open end or nozzle 5a, into the upper part of a chamber 6 through which passes the secondary air draught produced by a fan V, the shaft p of which may be mounted upon the shaft o of the crusher. Fig. 7 shows the throttled duct 5 positioned externally of the chamber 6 and closed by a door having one or two leaves 8 for regulating the flow of the air that is drawn in. A pivoted shutter 9 in the chamber 6 is provided for adjusting the size and position of the opening 11 between the chamber and the duct 13 leading to the fan V which withdraws the sufficiently-reduced materials, the coarser particles being discharged along a shoot fitted with a shutter 16. An opening 12 in the wall of the duct 13 is fitted with a sliding shutter 18. As shown in Fig. 8, the nozzle 5<a> opens horizontally in the inside of the chamber 6, and the spindle 10 of the shutter 9 is arranged at the top part of the chamber. The opening 12 at the top part of the machine occupies the whole width of the chamber 6 and is masked by the pivoted or sliding shutter 18. Partitions 19 are provided in the chamber 6 to direct the air and materials. In another arrangement, the partitions are arranged so as to cause the pulverized materials to traverse the secondary air draught several times. The end of the duct 5 may be divided into two flattened sections positioned horizontally in superimposed relation. To assist in excluding dust from the bearings of the shaft o, the central bearings are provided with channels 25 through which the air passes to the cavity 4. The material fed over a magnetic separator s is crushed between the stationary crown b and the hammers c and then pulverized between the hammers a and the outer crown 2.