铝带坯铸轧机保温炉流口处流槽液面升降的位移量，通过浸于铝液中的浮子将信号传递出来，此机械信号再通过杠杆以一定的传递比传递到差动变压器式位移传感器上，位移传感器将位移的机械变量转变为直流电压，传送到PLC控制器，PLC控制系统模块将电压参数转变为开关量，控制直流伺服电机启、停及正、反转，然后再通过机械装置带动保温炉口塞杆做直线运动，改变保温炉出流口的面积，从而改变铝液的流出量，保证了流槽液面在一定范围内的恒定。

Aluminum strip casting rolling mill furnace insulation displacement flow outlet groove liquid level, by immersion in liquid aluminum will float out signal transmission, the signal through the mechanical lever with a certain transmission ratio is transferred to the differential transformer displacement sensor, displacement sensor, mechanical variable displacement into a DC voltage to the transmission PLC controller, PLC control system module voltage parameters into the switch quantity control of DC servo motor start and stop and reverse, then driven by a mechanical device insulation mouth plug rod linear movement, change the furnace outlet area, thus changing the outflow of liquid aluminum, ensure the constant liquid level in the tank in a certain range.