Not only can it be automatically work independently, but also can it be connected with die-casting machine, spray unit and extraction machine to become an integral part of full automatic equipment. The imported coder is used to control the amount of molten metal in order to make the amount of molten metal more accurate. The amount of molten metal can be increased/decreased under both manual and auto modes, so the amount of molten metal is stable and repeatable, which greatly reduce the nonconformance rate.