电子电位差计(以下简称仪表),利用其附加电接触装置,对电加热炉的温度进行位式调节时,动作简单、可靠,故应用很广。但当电炉热惯性较大时,将使实际炉温远离给定控制值,通常会影响工件质量甚至造成废品。现根据对此问题的实践,谈以下几点看法。 (一)热惯性对炉温的影响仪表使用位式调节时,其调节动作为对加热电源进行“开”、“关”,即使通电、断电两种状态相互交替,因此炉温始终处在变化状态,并呈周期性波动。其调节效果与调节仪表存在的不灵敏区及炉子热惯性等因素有关,一般反映在实际炉温 Electronic potentiometer (hereinafter referred to as instrument), the use of its additional electrical contact device, the temperature of the electric heating furnace position adjustment, the action is simple and reliable, it is widely used. However, when the thermal inertia of the electric furnace is large, the actual temperature of the furnace will be far away from the given control value, which usually affects the quality of the workpiece or even causes waste. Now based on the practice of this issue, talk about the following views. (A) the influence of thermal inertia on the furnace temperature When the instrument uses the position adjustment, the adjustment action is to “on”, “off” the heating power, even if the power supply, power off two states alternate with each other, so the furnace temperature is always in Changes in status, and cyclical fluctuations. The regulation effect and adjust the instrument there is insensitive zone and the furnace thermal inertia and other factors, generally reflected in the actual furnace temperature