然而标准尺寸和橡胶圈的松紧程度因制造商而有所不同。
The standard sizes and the tightness of the elastic rings, however, vary by manufacturer.
经常检查一下导轨式升降机的链条的松紧程序，有油丝绳的要定期检查油丝绳 的松紧程度。
Often check the chain of the guide rail type of the tightness of the chain, the oil wire rope to periodically check the tightness of the oil wire rope.
则最好的松紧程度为：链条的中部在提起或压下的时候，两链轮中心距的约为2% - 3%。
The best tightness is: in the middle of the chain lift or press down, the center distance of the two sprocket is about 2%-3%.
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