Method and apparatus for heating an asphalt paving screed
AssigneeCarlson Paving Products, Inc.
InventorLarry Raymond
Life of this patent
Estimating the term…
Abstract
Heat exchange tubes are mounted on the upper face of the sole plates of the main screed and screed extenders on an asphalt paving machine. Hot oil is circulated through the heat exchange tubes to preheat the sole plates. The heating system for the oil includes a heat exchanger in the exhaust system of the internal combustion engine for driving the tractor of the paving machine. The heating oil is pressurized by a pump driven by a hydraulic motor supplied with pressurized oil in a second hydraulic circuit from a pump driven by the engine. This second circuit is also used to operated the vibratory mechanisms on the screeds.
Claims13
A heating system for the sole plate of a screed on an asphalt paving machine comprising:
- a tractor;
- an internal combustion engine on said tractor powering the tractor, said engine having an exhaust system;
- a screed coupled to said tractor, said screed having a sole plate;
- a first heat exchanger in said exhaust system;
- a second heat exchanger on said sole plate;
- and
- circulating means for circulating liquid between said heat exchangers and thereby transferring heat from said exhaust system to said sole plate.
A heating system for the sole plate of a screed on an asphalt paving machine comprising:
- a tractor;
- an internal combustion engine on said tractor powering the tractor, said engine having an exhaust system;
- a screed coupled to said tractor, said screed having a sole plate;
- a heat exchanger having a heat exchange tube mounted directly on said sole plate for receiving a heated liquid;
- and
- heat transfer means for heating a liquid from heat in said exhaust system and circulating the heated liquid through said heat exchange tube.
A heating system in an asphalt paving machine comprising:
- a tractor;
- an internal combustion engine on said tractor powering the tractor, said engine having an exhaust system;
- a main screed coupled to said tractor;
- extender screeds mounted on said main screed;
- sole plates on said screeds;
- a first heat exchanger in said exhaust system;
- additional heat exchangers on said sole plates of the main screed and extender screeds;
- and
- circulating means for circulating liquid between said first heat exchanger and said additional heat exchangers and thereby transferring heat from said exhaust system to said sole plates.
A combination heating system and vibratory system for a screed coupled to a tractor on an asphalt paving machine comprising:
- a tractor;
- a screed coupled to said tractor and having a sole plate;
- an internal combustion engine powering said tractor and having an exhaust system including a first heat exchanger for heating circulating liquid by the exhaust heat from the engine;
- a screed-heating hydraulic circuit including a second heat exchanger on said screed for heating the sole plate of the screed, and including a circulation pump for circulating heating liquid between said heat exchangers,
- a hydraulic motor coupled to said circulation pump;
- a vibratory unit on the screed driven by a second hydraulic motor;
- and a pressurized liquid supply circuit to said hydraulic motors including a primary pump on said tractor driven by said engine.
A method for heating a sole plate of a screed coupled to a tractor on an asphalt paving machine, said tractor having an internal combustion engine powering the tractor, said method comprising:
- transferring heat from the exhaust gases of said engine to a liquid;
- circulating the heated liquid to said screed;
- and transferring heat from said heated liquid to said sole plate.
Dependencies are inferred from the claim text.