double headed latch needle;double hook latch needle

Combined application of double-thread PCP(progressing cavity pump) and circular cross-section metal coiled pumping rod;

双头单螺杆泵与圆截面钢质连续抽油杆的配套应用

By taking the milling of twin thread screw for instance it introduces the application of machining in 4 axes as well as the trouble of interference in machining and how to resolve it.

四轴加工技术主要应用于加工具有较为复杂曲面的工件,本文论述了数控铣削加工中的四轴加工技术应用,并以双头螺杆的加工过程为例,说明了四轴加工的应用以及四轴加工中的干涉问题是如何产生和避免的方法。

Technological innovation in double-spinning process for polyester FDY;

涤纶FDY生产线双头纺丝改造