求翻译：此机变速齿轮带动，圆筒倾斜式翻动，砂在桶内翻滚由筛网中漏出，颗粒砂、铁渣由尾部落出，用此机处理后的砂无颗粒、铁渣，疏松柔和，可用做面砂使用。是什么意思？

This variable-speed gear driven drum tilt flip, rolling in the sand in the bucket from leaking out of the screen, sand particles, iron slag by the tail fell off, using this machine after processing the sand particles, iron-free, loose soft, available surface sand use.