Automatic control system for liquid level of aluminum slab ingot

According to the aluminum slab ingot liquid level automatic control system, the eddy current sensor detects the real-time height of the liquid level in the crystallizer, the real-time height is recorded into the liquid level height pre-judging circuit, the real-time height enters the amplifier for amplitude modulation after being subjected to voltage stabilization and filtering, and then the real-time height is subjected to hysteresis comparison with a set value through the hysteresis comparator; the low level is output, otherwise, the high level is output, the high level triggers the thyristor VTL1 to be conducted in a delayed mode, the relay K1 is powered on in a delayed mode, the normally open contact K1-1 of the relay K1 is closed, and when the normally open contact K1-1 of the relay K1 is closed, the pore flow detected by the flow sensor enters the flow deviation metering circuit; the liquid level height of the molten aluminum in the crystallizer detected by the eddy current sensor in real time is couple