GB190822595A - Improvements in or relating to Means for Drying and Coating Broken Stone, or Ore with Tar for Road Making or other purposes. - Google Patents

Abstract

22,595. Baxter, W. H. Oct. 24. Tanks and heaters, asphalt and like. -Relates to an arrangement of apparatus for drying, screening, and tarring broken stone &c. for road-making. The. drying - apparatus comprises a cylinder m rotated within brickwork g forming the flue j of a furnace h. The furnace gases follow the direction of the arrows 2, 3 around and through the cylinder, from which they pass to a chimney l with a suction fan w. The stone from a crusher a passes down a shoot f through a circular hopper r of the kind described in Specification No. 8503, A.D. 1901, [Abridgment Class Sifting &c.], into the cylinder m, which is divided into compartments by internal rings s constructed as described in Specification No. 28,156, A.D. 1907, [Abridgment Class Sifting &c.], for passing the stone from one compartment to the next. The compartments at each end are perforated for the removal of dust, and are surrounded by additional screens p, q constructed as described in Specification No. 3802, A.D. 1902, [Abridgment Class Sifting &c.], and communicating with hoppers u, u<1>, v. The hopper v has drop doors v<1>, Fig. 2, which prevent any inrush of air into the cylinder m. The hopper u communicates with the chimney l, which may be vertical or inclined as shown in dotted lines, Fig. 2 ; in the latter case a pendant pipe x may carry a bag y to catch the dust. The dried stones pass through hoppers k, 1 to be mixed with heated tar in an inclined rotary cylinder 4, which is fitted with a conveying - blade 7 arranged as described in Specification No. 17,825, A.D. 1900, [Abridgment Class Metals and alloys].