| 摘要 |
An apparatus for heating and mixing an asphalt-aggregate composition comprises a drum rotatable about an axis, having a mixing and heating chamber with a restricted port at one end into which a flame and hot gases of combustion are directed and through which exhaust gases concurrently pass to atmosphere. A heating means comprises a burner for directing flame and the hot gases of combustion into the chamber at the restricted port along the drum axis of rotation and which burner is adjustable relative to the port along the drum axis of rotation. A burner assembly includes an air duct having an air entrainment port located away from substantial exposure to the drum exhaust gases. The drum includes a plurality of pegs extending into the drum chamber. Heating is carried out in a rotating drum without forming a veil or curtain of particulate composition through the hot gases of combustion.
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