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在选厂设计中,为了提高破碎机生产能力,往往采用固定格筛进行预先筛分。很多厂矿生产实践表明,固定格筛虽然构造简单、价格便宜和不需动力等优点,但是筛孔容易堵塞,筛分效率很低,一般仅为50～60%;筛面需经常进行清理,劳动强度大,如不及时清理即变成不起筛分作用的溜槽,尤其对含泥多的矿石更为严重。我矿凹山选厂破碎筛分系统为三段一闭路流程。原设计在φ2100毫米标准型圆锥破碎机前采用1500×3500毫米固定格筛进行预先筛分。入料粒度350～0毫米,筛孔尺寸75毫米,筛子倾角12°。1965年底选厂即将建成投产时,一些老工人和工程技术人员根据凹山矿石含泥多的特点(-200目占16%),提出用滚轴筛代
In the plant design, in order to improve the crusher production capacity, often using a fixed grid sieve pre-screening. Many factories and mines production practice shows that although the fixed grid sieve has the advantages of simple structure, cheap price and no power, the sieve hole is easy to block and the screening efficiency is very low, which is generally only 50-60%; the sieve surface needs to be cleaned regularly and the labor Strength, if not promptly cleaned into a chute can not afford to play, especially for more mud with more of the ore. Mine Mine Hill Separation Plant screening system for a three closed loop process. The original design in φ2100 mm standard cone crusher before using 1500 × 3500 mm fixed grid sieve pre-screening. Feed size 350 ~ 0 mm, sieve size 75 mm, sieve angle 12 °. At the end of 1965, when the mill was about to be put into operation, some old workers and engineering technicians proposed to use roller screen to replace