需要注塑机上多少电源型号来控制抽真空过程中的抽气阀和VJ抽真空机构通过顶针的抽气。

2个独立信号：

一个用于控制抽气阀；它必须在注塑前打开和关闭气动活塞。它必须与注塑周期同步。

另一个用于控制抽气。根据顶针的直径及间隙的大小，抽气回路应当打开和关闭，因为如果很多气体从顶针间隙抽气，那注塑时很可能跑胶进去；如果顶针很小或者间隙很小，那抽气回路可以一直开着。

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