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简要介绍JZ450型铝带精轧机的设备组成。详细说明由M-1069A型可编程可逆计数器组成的电动压下系统的工作原理。该系统操作简便、经济实用，适用于小型铝加工设备。
Brief introduction of JZ450 aluminum strip finishing equipment components. Detailed description of the M-1069A programmable reversible counter programmable electric pressure reduction system works. The system is easy to operate, economical and practical, suitable for small aluminum processing equipment.