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1．存在问题机械牌坊式深度指示器，由于指示清楚直观，工作可靠，在各种提升机中广泛使用。但其传动比是有级的。尽管用户所用的齿数比由提升机的卷筒直径和实际提升高度来选配［‘j，但从文献卜」中选出的齿数比，并不能保证限速圆盘在一个提升行程内的旋转角不小于2700。如
1. Problems Mechanical archway depth indicator, due to direct and clear instructions, work reliably, widely used in a variety of hoist. But its transmission ratio is a class. Although the number of teeth used by the user is selected from the drum diameter and actual lifting height of the hoist [’j, the gear ratio selected from literatures does not guarantee the rotation of the speed limit disc over an extended stroke Angle is not less than 2700. Such as