The working principle of the vacuum melting furnace

The working principle of the vacuum melting furnace

(1) by melting furnace melting zone, heat preservation zone, before furnace, feeder, chimney and other major parts. Control part mainly combustion system, feeding system, the operation process of program control.
(2). The working process, the aluminum alloy ingot or foundry return < resembles ingredients or components of waste aluminum and other > in charging car capacity is about 300 kg > < every time, through the charger will be charging car aluminum alloy ingot or charge back into fusion zone in the combustion chamber, the heating melting, melting process of waste gas, smoke through the chimneys, melt after low temperature liquid aluminum from higher melting zone into position with low heat preservation zone, the liquid aluminum heat preservation in the area to reach the specified temperature and heat preservation. Open the oven door holding area operation, refining, degassing of liquid aluminum, slag treatment, the liquid aluminum purification, and keep the aluminum aluminum liquid temperature in the setting of the temperature range. Liquid aluminum after heat preservation area at the bottom of the computation in the furnace, stove out of aluminum mouth can be released before the adoption of the liquid aluminum.
Melting furnace combustion control system:
Mainly control of liquefied petroleum gas flow rate, pressure and air supply, through the control of the liquefied petroleum gas and air, and melting of liquid aluminum, temperature control.
Combustion mechanism: consists of three burner. The fusion zone 2, heat preservation zone 1, each burner were the main burner and vice burner (also called burning mouth). As long as the work burner, burning mouth is often burn, namely vice burner must always keep a fire, the main burner to burn properly, this is very critical. And the switch of the main burner is by aluminum liquid temperature, liquid level, melting temperature to decide, by a system of automatic control.
Combustion process: liquefied petroleum gas and air after Lord, vice burner and the air blower into mixed in certain proportion combustion, heating of aluminum alloy melt, flame length by proportional valve can be adjusted, achieve the goal of regulate the temperature of a liquid aluminum.
Combustion control: melting furnace control of the whole combustion process, is made up of three temperature measuring thermocouple, 2 ~ 3 liquid level sensor, a material level sensor, three flame detecting element to realize interlock control and so on ultraviolet detector.
Three temperature measuring thermocouple: installed in the furnace area (determine the aluminum temperature), heat preservation zone above the chamber of a stove or furnace (determination of furnace atmosphere temperature), emissions (determination of exhaust gas temperature).
Above the liquid level sensor, are inserted in the furnace zone, the determination of aluminum liquid level height, of which 1 level gauge probe to the furnace two ends to cover a distance of 100 mm from the former furnace, liquid aluminum reaching this level, for the liquid aluminum ceiling, another gauge probe before the end of the furnace furnace cover distance is 70 mm, on the liquid aluminum ceiling. Reach the ceiling, about 3.2 tons of liquid aluminum heat preservation area, and limited time, about 3.5 tons of liquid aluminum. Boiler no. 2, no. 3 furnace furnace furnace cover before liquid level sensor is apart from the distance of up to 170 mm, the upper limit is 140 mm, the distance is mainly based on principles of heat preservation in liquid aluminum liquid level security.
Material level sensor (photocell) located in the fusion zone tower above feeding, control burden charging the highest position.