该装置主体结构采用自力机械式结构。原理简单，无需外部电源，操作使用、维修保养方便。
With purely mechanical construction and no need of outside power, the device's working principle as well as its operation and maintenance is very simple.
时间及速度可外部设定，调速容易。采用AC马达，适合长时间连续运转，不必保养。
AC motor drive, suitable for long lime and continuous operation, no maintenance requirement.
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