Abstract:

From the bionics point of view, this paper designed a concave groove shape needle, according to the microstructure of mosquito mouthparts, produced the bionic needle using the JG20-1 laser surface texturing processor, and measured the force during the needle piercing into the silica, and analyzed the mechanical mechanism. Results show that the bionic needle has the drag reduction effect, and the drag reduction effect increases with increase of the number of grooves. The drag reduction effect changes with the contact area between the needle and silica, the more contact area is, the better the effect is. To some extents, concave grooves of needle produce eddy current effect, make the sliding friction turn to rolling friction, and reduce the friction.

Key words: bonics, concave groove, drag reduction, syringe needle

摘要：

从仿生学角度出发,依据蚊子口器的形态结构,设计了凹槽形仿生结构针头。采用激光表面毛化处理机加工出凹槽形仿生针头,对仿生针头的穿刺阻力进行了测定,并对其刺入机理进行了分析。试验表明：凹槽形仿生针头较光滑针头具有减阻效果,且减阻效果随凹槽数量的增加而增大,凹槽宽度对针头的减阻效果呈先增后减的趋势;针头与刺入介质接触面积越小,针头减阻效果越好;凹槽结构在刺入过程中产生涡流效应,使滑动摩擦变为滚动摩擦,减小了摩擦阻力。
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关键词: 仿生, 凹槽形, 减阻, 注射器针头