在79年底,对我厂的旧砂低压吸送装置进行了改进设计。80年9月,改进后的新设备投入了使用,至今已有二年多的时间了,使用情况一直良好,输送量由改造前的5～6吨/小时,提高到现在的18～20吨/小时。本文将着重对改造前的吸送装置进行分析,指出不足,引出经验。并将改造后的情况作一简单介绍. At the end of 79, we improved the design of our old sand low-pressure suction device. In September 1980, the improved new equipment was put into use. It has been more than two years since its use and has been in good condition. The transportation capacity has been raised from 5 to 6 tons / hour before the transformation to 18 to 20 tons now /hour. This article will focus on the transformation of the suction device before the analysis, pointed out that the lack of experience. And a brief introduction of the situation after the transformation.