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US 5,344,229 AGranted
Angle and velocity adjustment of a hot mix asphalt drum when output gas temperatures are uneven
AssigneeCyclean, Inc.
InventorsRobert H. Nath, John Wiley, Robert Erickson, Carl R. Hutchison, Mike Miles
Life of this patent
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Abstract
An apparatus for controlling the angular velocity and slope angle of a hot mix asphalt drum as a function of the temperature gradient across the drum outlet. Uneven gas outlet temperature indicates that the veil of RAP (Recycled Asphalt Pavement) in the drum is insufficient. The veil is increased by increasing drum speed. The complete recycled asphalt pavement hot mix asphalt plant uses uneven gas outlet temperatures to change drum operating parameters.
Claims5
A counterflow drum mixer for production of hot mixed asphalt (HMA) comprising in combination:
- said drum mixer having a hot gas inlet and means for generating hot gas;
- said drum mixer having a gas outlet;
- said drum mixer having a veil of falling HMA within said drum mixer;
- an array of gas temperature sensing means located at said outlet for detecting gas temperature;
- and
- means responsive to a gas outlet temperature rise, not detected on all of said sensing means, for changing at least one drum operating parameter of said drum which changes said veil of falling HMA.
3 more elements
Dependencies are inferred from the claim text.