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US 3,942,944 AGranted
Heating of aggregate material for asphalt mixing
AssigneeH. Nielsen & Son Maskinfabrik A/S
InventorAage Nielsen
Life of this patent
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Abstract
A method and an apparatus for heating a granular aggregate for mixture with asphalt by means of a flue gas being chemically inert to the aggregate. The aggregate is moved intermittently within the gas under control of the stationary periods of driven screw conveyors. The apparatus has several heating sections, each section having a conveyor, a thermostat with a sensing device at the end of the section, and possibly also an oil burner, the thermostat being connected to the driving means of the conveyor.
Claims6
In an asphalt mixing apparatus, a means for heating granular aggregate material comprising,
- a chamber,
- conveyor means in the chamber for supporting granular aggregate material and moving it intermittently through the chamber, said conveyor means including a plurality of serially arranged conveyor sections,
- each of said conveyor sections having temperature sensing means for sensing the temperature of aggregate material therein,
- means for producing flue gases and directing them through the chamber for heating the granular aggregate material in the chamber, said flue gases being chemically inert to the aggregate, and control means connected to and responsive to the temperature sensing means for controlling the temperature of the aggregate by changing the duration of stationary periods between the periods of conveyor movement.
1 more element
Dependencies are inferred from the claim text.