而液压式拔卸器的结构决定了它可以垂直用力，软力臂相互间的距离也可以进行调节，扩大了拔卸器原有的工作范围。
While the structure of hydraulic puller makes it possible to work vertically and the distance among various flexible arms can be adjusted so the application area of pullers is enlarged.
其次，传统的拔卸器和轴承工件之间有一个相对角度，因此不能垂直用力，工作范围受限。
Secondly there is a relative angle between a traditional puller and workpieces so the puller can't work vertically, which limit its application field.
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