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以往台车式火焰炉的台车台面是平的,燃料和空气从燃烧器中喷出着火燃烧后,火焰或者向上流动,或者直接射向待加热的工件。那种结构的炉子在加热工件时,炉内各处温度极不均匀,高低差异一般为100～200℃,往往在工件上部或受火焰喷射的局部,已经达到要求加热的温度甚至过热时,工件下部、尤其是低部还处于“冷”态,特别是在热处理炉内,这一温度不均匀,对于尺寸稍大一些的工件,就很难保证得到高水平的热处理质量。以往台车式火焰炉的密封结构,只是台车两侧下方和尾部与后墙交接处用砂封,因而有可能使大量空气从炉门或台车尾部两侧漏入炉内,从而降低炉内温度并造成局部低温区,既浪费燃料,又使炉内各处温度的差异增大。笔者在设计燃油的台车式火焰热处理和时效炉时,对台车和密封结构作了改进,简述如下。
In the past, the trolley surface of a trolley-type flame furnace was flat. After the fuel and air were emitted from the burner, the flame burned either upward or directly onto the workpiece to be heated. That structure of the furnace heating the workpiece, the furnace temperature is very uneven throughout the level of difference is generally 100 ~ 200 ℃, often in the upper part of the workpiece or by the flame jet has reached the required temperature of the heating or overheating, the workpiece The lower part, especially the lower part, is still in a “cold” state, especially in heat treating furnaces where the temperature is not uniform and it is difficult to guarantee a high level of heat treatment quality for slightly larger workpieces. In the past, the sealing structure of the trolley-type flame furnace was sand sealed only under the trolley on both sides and at the junction of the tail and the rear wall, thus making it possible to leak a large amount of air into the furnace from both sides of the rear of the furnace door or the trolley, Internal temperature and local low temperature zone, not only waste the fuel, but also to increase the temperature difference throughout the furnace. The author in the design of the fuel trolley flame heat treatment and aging furnace, the trolley and the sealing structure made an improvement, summarized as follows.