压下限位开关，切断电路停车，再合闸时，吊钩只能下降。
Pressure limit switch circuit is cut off, stop, and then closing, the hook can only decrease.
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.
用专用电机带动卷帘中心轴转动，达到卷帘开关，当转动到电机设定的上下限位时自动停止。
Use special motor to drive the rolling center shaft to rotate, to achieve the shutter switch, when the motor is set to the upper and lower limits automatically stop.
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