| 摘要 |
A drum mixer asphalt plant is provided with a rotatable cylinder (10) in which virgin aggregate, recycle material and liquid asphalt are mixed to produce an asphaltic composition and the hot gas stream for heating and drying the materials flow in countercurrent relation. In a first zone within the cylinder (10), aggregates are heated and dried by heat radiation and a hot gas stream generated at a burner head (46) of a combustion assembly (40). In a second zone within the drum cylinder (10) isolated from the burner flame and hot gas stream by the combustion assembly (40), liquid asphalt is sprayed from an injection tube (76) to mix with aggregate materials. A recycle feed assembly (60) delivers recycle asphalt material to the second zone also for mixing with the aggregate and liquid asphalt. <IMAGE>
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