The disadvantages in the prior art that a chain can be curled by winding the shaft only in the vertical surface and can not be bent on the horizontal plane is overcome;
克服现有技术中链条只能在垂直面内绕轴卷曲，不能在水平面内折弯的缺陷；
The disadvantages in the prior art that a chain can be curled by winding the shaft only in the vertical surface and can not be bent on the horizontal plane is overcome;
克服现有技术中链条只能在垂直面内绕轴卷曲，不能在水平面内折弯的缺陷；
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