我矿用沈阳重机厂制造的φ3.2×3.1米格子型球磨机,工作转速为18转/分,其进料衬板如图1。自投产二十年来,每次更换其各部位磨损基本接近。1977年以来,我们对其进行考察,其磨损最严重部位均在小端衬板螺钉孔附近,每次更换均因其小端螺钉被磨松动或掉出,漏沙严重。其各部位磨损情况如 I mine Shenyang Heavy Machinery Manufacturing Factory φ3.2 × 3.1 m grid-type ball mill, working speed of 18 rev / min, the feed liner shown in Figure 1. Since its production two decades ago, each replacement of its various parts of the basic wear and tear. Since 1977, we inspected the most serious parts of the wear are in the vicinity of the small end plate screw holes, each replacement because of its small end screw was loose or fall off the mill, a serious leakage of sand. Its various parts such as wear and tear