circular stairs ,spiral stairs ,screw stairs ,nesel stairs

Development and application of horizontal screw type mine car cleaner;

卧式螺旋清车机的研制与应用

Refitting of Large Diameter Roller Screw Lathe;

大直径卷筒螺旋车床的改造

The Manufacturing Technique of the Screw Component;

进口螺旋国产部件的加工工艺

Experimental research on automatic fouling removal capability of hydro-dynamic spiral;

流体动力螺旋自动清洗除盐能力模拟试验研究

Mathematical Model and Moulding Design of Spiral Blades in Taper Pre - mixer of Flour;

锥型面粉预混合机螺旋叶片的数学模型及造型设计

Experimental reaserch on the spiral inserts of fouling preventing inheating tubes of evaporators;

蒸发器加热管内螺旋防垢保洁试验研究

Principle and characteristics of helix movable steel globe teeth drive;

螺旋钢球活齿传动的原理及特点

Based on the basic principle of normal mode helix antenna, the qualification of circular polarized normal helix is educed firstly.

利用法向模螺旋的基本原理,推导出获得圆极化法向模螺旋应满足的条件,并对多臂法向模螺旋的波束调控进行了理论分析,获得了从法向到轴向方向之间任意辐射波束的多臂法向模螺旋的设计方法,利用此方法设计了波束倾斜15о的四臂螺旋天线,实测结果达到设计要求。