Description
固体部分称量包括沸石、五钠、芒硝、纯碱、增白剂及胶粉等六种物料.其中,沸石与五钠共用一个称量斗,芒硝与纯碱共用一个称量斗,增白剂与胶粉共用一个称量斗,供料采用双速电机(即快、慢供电机)实现.传统的称量控制方式采用称量控制仪(如PHILIPS公司的PR1615)实现,而在本系统中,称量控制是由S7 414完成的.
称量控制原理如下:
若检测重量大于快供值,则快供电机启动,慢供电机停止;若检测重量大于慢供值且小于快供值,则慢供电机启动,快供电机停止;若检测重量大于提前值且小于慢供值,则慢供电机停止,快供电机停止.
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