Fatigue damage of mixing plant parts: manifestations: fracture and surface peeling: treatment method: improve the surface finish of parts during manufacturing, and adopt relatively mild section filtration to reduce the stress concentration of parts. In addition, good results can be obtained by using carburizing, quenching and other methods to improve the hardness, toughness and wear resistance of parts.

而对于一些常见的损伤可以采取适当的修复措施，

For some common damages, appropriate repair measures can be taken,

裂纹的修补：裂纹的修补可用钳工修补、焊补和粘补等方法，但不论用什么方法对裂纹进行修补，都须在裂纹两端钻止裂孔以防止裂纹的扩大。同时也须裂纹附近的油污、氧化皮等。钳工修补主要应用于不太重要的部位的裂纹修补，常见的方法有帮板加固或扣键锚固的方法。对箱体零件进行焊补时，应严格按照焊接工艺参数进行，并采取“加热减应”和其他减小应力防止变形的措施。

Crack repair: the crack can be repaired by fitter repair, welding repair and sticking repair, but no matter what method is used to repair the crack, crack stop holes must be drilled at both ends of the crack to prevent the expansion of the crack. At the same time, the oil stain and oxide scale near the crack must also be removed. Fitter repair is mainly used to repair cracks in less important parts. The common methods are upper plate reinforcement or key fastening anchorage. Welding repair of box parts shall be carried out in strict accordance with the welding process parameters, and "heating stress reduction" and other measures to reduce stress and prevent deformation shall be taken.

孔的修复。箱体上的孔发生磨损或其他内表面损伤时，可用轴或轴承与孔恢复配合精度的方法修复。当孔壁磨损不大时，可对孔壁或轴颈和轴承外圈镀铬修复；当磨损较严重时，采取镶套的方法，对有些镶有衬套的孔，可用更换或修复衬套的方法。在修复孔时应与箱体的整形加工统盘考虑，即应考虑孔的中心距和中心线间的平行度误差。

Repair of holes. When the hole on the box is worn or other internal surface is damaged, it can be repaired by restoring the matching accuracy between the shaft or bearing and the hole. When the hole wall is not worn much, the hole wall or journal and bearing outer ring can be repaired by chromium plating; When the wear is serious, the method of inserting sleeve shall be adopted. For some holes embedded with bushing, the method of replacing or repairing bushing can be used. When repairing the hole, it should be considered with the shaping and processing of the box, that is, the center distance of the hole and the parallelism error between the center lines should be considered.

焊补修复，焊补前对工件预热以及施焊时的焊接热量都会引起工件的变形，所以应安排在前道工序；粘接修复，因粘补时某些粘接剂也需要加热固化，因而也可能引起工件的变形；恢复整修加工基准，并检测变形情况；钳工修补，整形加工和镶套等机加工。

Welding repair, preheating the workpiece before welding repair and welding heat during welding will cause deformation of the workpiece, so it shall be arranged in the previous process; For bonding repair, some adhesives also need to be heated and solidified during bonding, which may also cause deformation of the workpiece; Restore the refurbishment processing benchmark and detect the deformation; Fitter repair, shaping and casing machining.

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