双滑轮
shuāng huá lún
- Double pulley;sister block
双滑轮
双滑轮[shuāng huá lún]
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双滑轮可选步骤。
Optional double steps of pulleys .
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当雨过天晴，旋转双槽滑轮，防雨材料自行收拢。
When a rainy day is converted into a sunny day , the double groove pulley is rotated ;
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该装置由柱桩、导轨、活动杆、牵引绳、支撑绳、双槽滑轮、按钮等组成。
The utility model is composed of a post , a guide rail , a movable rod , a traction rope , a support rope , a double groove pulley , a button , etc.