以唐钢彩涂生产线为基础，简要论述了运卷小车的自动复位过程及自动导卷的原理及实现过程。

Based on the production line of color coating in Tangshan Iron and Steel Corporation, the principle and implementation of automatic resetting and coil transferring for carriage are described in brief.

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钢卷升降运输小车广泛用于轧钢工业生产线，在使用过程中其液压系统经常出现故障。

Coil car has been widely used in rolling production line. But fault of hydraulic pressure occurs frequently because of the influence of oil on every hydraulic component.

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