举例子，任何含有螺旋副的连杆机构，由于它的相对运动是螺旋线形的，因此是空间的机构。
Any linkage which contains a screw pair, for example, is a spatial mechanism, since the relative motion within a screw pair is helical.
干燥机轴焊有多套，多层不同心无缝管，每套有多根大小不同弯成阿基米德螺旋线形无缝管组成。
The dryer shaft is welded with several sets of multi-layer non-concentric seamless tubes, each of which is comprised of multiple seamless tubes having different sizes bent in Archimede's spiral.
本发明的另一个方面包括一种制造本发明传热管的方法，传热管具有在管外侧螺旋线形环绕的整体外肋条。
A further aspect of the invention includes a method for producing a heat exchanger tube according to the invention, with integral outer ribs helically encircling on the tube outside.
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