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我厂一台560kg空气锤,已使用了20多年,经过多次修理后,工作缸孔径(原设计φ510mm)的积累磨损量达10.2mm,并有圆度、圆柱度误差,锤杆悬不住,无法继续使用。经检查发现:两侧导程板与锤杆结合面间的间隙分别为2.4mm和0.9mm;锤杆两边圆柱面与导程体之间的间隙分别为0.3mm和0.9mm。根据JB1294—82空气锤检验项目第三项之规定,即这两种间隙的最大与最小之差,不大于实测平均间隙的2/3(可根据修理情况,适当放大为2.5/3和1),已超出或接近其要求;圆弧形阻漏圈径向厚度为30mm,中部实测为28.8mm;锤杆圆弧面直径上、下端相差0.35mm。因此判定:工作缸的内径、活塞环、阻漏圈、导程板等件
I plant a 560kg air hammer, has been used for more than 20 years, after repeated repairs, the cylinder bore (the original design φ510mm) accumulated wear and tear amounted to 10.2mm, and roundness, cylindricity error, the hammer can not be suspended , Can not continue to use. The inspection found that: the gap between the guide plate and the hammer rod on both sides of the gap were 2.4mm and 0.9mm; hammer on both sides of the cylindrical surface and the lead body gap were 0.3mm and 0.9mm. According to the second item of JB1294-82 air hammer inspection project, the difference between the maximum and minimum of these two clearances is not more than 2/3 of the measured average clearance (which can be appropriately enlarged to 2.5 / 3 and 1 according to the repairs) , Has exceeded or close to its requirements; arc-shaped blocking ring radial thickness of 30mm, measured in the middle of 28.8mm; hammer rod arc diameter, the lower end of a difference of 0.35mm. Therefore, the determination: the working cylinder diameter, piston rings, baffle ring, guide plate and other pieces