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针对渡桥式加热炉工艺特性及创新性设计结构,采用独立式烧嘴分区控制,并对传统脉冲燃烧控制进行优化设计,对PID输出值进行分段,在不同区间段内设定烧嘴不同的大小火燃烧状态,以解决加热过程中工件局部受热不均现象。分析了分段脉冲燃烧的改进思路,给出了烧嘴工作时序的控制,借助带位置反馈空气电动蝶阀实现了烧嘴的限位输出。整个控温系统采用分布式、冗余化设计结构,节约硬件成本、运行可靠。实际运行效果表明系统性能稳定,控温精度高,很好的满足了工艺要求。
Aiming at the technological characteristics and innovative design structure of the transitional furnace, the independent burner control is adopted. The traditional pulse combustion control is optimized. The PID output value is segmented and the burner is set differently in different intervals The size of the fire burning state, in order to solve the uneven heating of the workpiece in the local heating phenomenon. The improved idea of segmented pulse combustion was analyzed. The working sequence of the burner was given and the position limit of the burner was achieved by the air-operated butterfly valve with position feedback. The entire temperature control system uses a distributed, redundant design structure, saving hardware costs, reliable operation. The actual operating results show that the system performance is stable, high precision temperature control, good to meet the process requirements.