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中文摘要：
针对激光再制造对粉末输送的要求,设计一种基于流化床原理的沸腾式送粉器。实验采用粒径为75～109μm的Ni基合金粉末,在干燥室内环境下进行,分别在送粉器结构尺寸不同、气动回路控制方法不同以及沸腾气体流量不同的情况下对送粉器进行实验。根据实验结果对送粉器结构、气动控制回路进行改进。研究表明：内部尺寸适当小的送粉器其最小送粉率可达1.7 g/min;沸腾气体流量的变化对送粉率影响显著,即送粉率随着沸腾气体流量的增大而增大,且两者存在一定的线性关系;沸腾式送粉器的稳定送粉范围为2.5～20 g/min。
英文摘要：
In order to satisfy the powder feeding rate of laser remanufacturing,a powder feeder based on the principle of fluidized bed was designed.Experiments employ 75~109 μm nickel-base alloy,conducted in dry indoor environment.The feeder was tested respectively under different structure size of powder feeder,different control method of pneumatic circuit,and different flow rate of fluidizing gas flow.According to the tests＇ results,the structure of feeding device and pneumatic circuit were improved.Researches show that with appropriate small inner dimensions,the minimum feeding rate of the feeding device can be 1.7 g/min;fluidizing gas flow influences the feeding rate significantly,and they have a certain linear relationship.The feeding rate range of the optimized feeder is from 2.5 g/min to 20 g/min.
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