以下为句子列表：
英文: Lifting and dropping of the mechanical arm are realized through ball screw driven by gear motor with belt brake, meanwhile, double security protection is applied, namely, at normal operation limit, the proximity switch is adopted and at upper or lower lim
中文: 上下动作采用带刹车减速电机带动滚珠丝杆实现,并采用二级安全保护,即正常工作限位采用接近开关,上下限限位采用行程开关。
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