The overtravel-limit control by photo-electricity switch for the requirement of the production is presented. It fulfilled the double insurance control according to the demand of the manufacturer.
针对生产实际需要，提出利用光电开关实现限位
，并能实现双保
。
The overtravel-limit control by photo-electricity switch for the requirement of the production is presented. It fulfilled the double insurance control according to the demand of the manufacturer.
针对生产实际需要，提出利用光电开关实现限位，并能实现双保。
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