초록 ▼

Annular lands are mounted on the inner periphery of the tubular shell of a drum for an asphalt mixing apparatus of the type wherein the drum is disposed on a slant and rotated so that flighting arranged about the inner periphery of the drum lifts and drops aggregate and asphalt across the drum to tr

Annular lands are mounted on the inner periphery of the tubular shell of a drum for an asphalt mixing apparatus of the type wherein the drum is disposed on a slant and rotated so that flighting arranged about the inner periphery of the drum lifts and drops aggregate and asphalt across the drum to transport the aggregate and asphalt toward the lower end of the drum. Portions of the flighting are mounted in the inner periphery of the shell and portions are mounted on the annular lands. The lands reduce the inside diameter of the drum in selected regions thereof to establish differing advance rates of aggregate and asphalt through the drum in different regions thereof so as to selectively vary the density of veils of asphalt and aggregate across the drum with axial location within the drum.

대표청구항 ▼

In an apparatus for producing hot mix asphalt in a rotating drum disposed on a slant with an input end thereof higher than an opposed discharge end thereof, said apparatus including means for introducing aggregate into the input end of the drum, means for receiving asphalt from the discharge end of

In an apparatus for producing hot mix asphalt in a rotating drum disposed on a slant with an input end thereof higher than an opposed discharge end thereof, said apparatus including means for introducing aggregate into the input end of the drum, means for receiving asphalt from the discharge end of the drum, means for introducing a flame into the input end of the drum, means for introducing asphaltic oil into a medial portion of the drum, and flighting arranged in rows about the inner periphery of the drum for lifting and dropping aggregate and asphalt in a veil across the drum so as to transport the aggregate and asphalt toward the discharge end of the drum, an improved drum comprising: a cylindrical shell extending between the input end of the drum and the discharge end thereof; and means forming an annular land on the inner periphery of said shell between the input end thereof and the medial portion of the drum where asphaltic oil is introduced into the drum, wherein at least one row of said flighting is carried by portions of the inner periphery of said shell between the means forming the annular land and the input end of the drum and at least one row of flighting is carried by the means forming the annular land.