我国粮仓机械近几年来发展很快,一些新式机构不断地被引用到粮仓机械中来,使粮仓机械的性能日趋完善,在生产中发挥了越来越大的作用。“剪刀撑”——一种伸缩机构在粮仓机械中的引用,就是其中一例。 目前,我国粮仓机械中常使用的伸缩机构主要有三种形式:钢丝绳牵引式、齿轮齿条传动式、螺母螺杆传动式。这三种形式各有其优点,但也都具有不可克服的缺点。钢丝绳牵引式结构松散,体积较大,占用空间较多;齿轮齿条式和螺母螺杆式则必需有较长的齿条和螺杆,而这种齿条和螺杆不但难于加工制造,而且使用时容易损坏和失效。1975年陕西省粮油科学研究所设计和试制的伸缩式胶带输送机,引用了剪刀撑式伸缩机构。实践证明,它具有结构紧凑、制造简单、工作平稳、传动可靠等优点。近年来,有的单位在其它粮仓机械 China’s granary machinery developed rapidly in recent years, some new institutions continue to be quoted in the granary machinery to make the performance of granary machinery maturing in production has played an increasingly important role. Scissor Bracing, a reference to a retractable mechanism in granary machinery, is one example. At present, the telescopic mechanism often used in our country granary machinery mainly has three forms: wire rope traction, rack and pinion drive, nut screw drive. Each of these three forms has its own merits, but all also have insurmountable disadvantages. Rope traction rope structure loose, larger, taking up more space; gear rack and nut screw type you must have a longer rack and screw, and this rack and screw not only difficult to manufacture, and easy to use Damage and failure. 1975 Shaanxi Provincial Institute of grain and oil science and design of the trial production of the telescopic belt conveyor, scissors telescopic telescopic body cited. Practice has proved that it has the advantages of compact structure, simple manufacture, stable work, reliable transmission. In recent years, some units in other granary machinery