| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve problems of a conventional hot air screed plate heating device wherein if a blower for blowing hot air into a duct fails, flame is reversely blown from a burner, or when the ignition of the burner is failed, unburned LP gas remains in the duct and a risk of explosion of the gas is generated if the gas is flash ignited. Ž<P>SOLUTION: An electric energy is converted into a heat energy by a heater 51L, and the air in a heating part 39L is heated to generate hot air. The hot air generated by the heater 51L is fed, as hot air, to a forward passage A in the duct on a screen plate 31L by a fan 38L, flows while heating, by heat transfer, the half of the upper surface of the screed plate 31L, and flows into a return passage B in the duct after returning at the end of a partition plate 34L. The hot air flowing into the return passage B is reheated by a reheating heater 52L, flows while heating the remaining half of the upper surface of the screed plate 31L, and is sucked to the fan 38L. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
