Double-loop double-station magnesium alloy low-pressure casting gas mixing process and double-loop double-station magnesium alloy low-pressure casting gas mixing device

The invention discloses a double-loop double-station magnesium alloy low-pressure casting gas mixing process and a device. The device comprises a first gas mixing tank, the first gas mixing tank is connected with a first gas supply loop and a second gas supply loop respectively; the first gas supply loop is formed by sequentially connecting a second loop pressure reducing valve, a first pressure switch, a first speed control valve, a first flow switch, a first two-way electromagnetic valve and a first one-way valve in series through pipelines. The first one-way valve is communicated with an inlet of the first gas mixing tank, the second gas supply loop is formed by sequentially connecting a first loop pressure reducing valve, a second pressure switch, a second speed control valve, a secondflow switch, a second two-way electromagnetic valve and a second one-way valve in series through pipelines, and the second one-way valve is connected with an inlet of the first gas mixing tank. The problems that magnesium al