也称变幅限位或幅度指示器，一般的动臂起重机的起重臂上都挂有一个幅度指示器。
Also known as the amplitude limit or range indicator, jib cranes general boom are linked to a range of indicators.
当臂杆运行到上下两个极限位置时，分别压下限位开关，切断主控电路，变幅电机停车，达到限位的作用。
When the arm runs to the upper and lower two limit position, respectively press the lower limit switch, cut off the main control circuit, variable amplitude motor parking, to limit the role.
其设计的合理与否，对支臂的运动与受力、变幅动作的方便与灵活，都有很大的影响。
The design of these parameters has a great influence on the boom moving and stress and the swing action.
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