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.

而對于一些常見的損傷可以采取適當的修復措施，

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

裂紋的修補：裂紋的修補可用鉗工修補、焊補和粘補等方法，但不論用什么方法對裂紋進行修補，都須在裂紋兩端鉆止裂孔以防止裂紋的擴大。同時也須清除裂紋附近的油污、氧化皮等。鉗工修補主要應用于不太重要的部位的裂紋修補，常見的方法有幫板加固或扣鍵錨固的方法。對箱體零件進行焊補時，應嚴格按照焊接工藝參數進行，并采取“加熱減應”和其他減小應力防止變形的措施。

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.

孔的修復。箱體上的孔發生磨損或其他內表面損傷時，可用軸或軸承與孔恢復配合精度的方法修復。當孔壁磨損不大時，可對孔壁或軸頸和軸承外圈鍍鉻修復；當磨損較嚴重時，采取鑲套的方法，對有些鑲有襯套的孔，可用更換或修復襯套的方法。在修復孔時應與箱體的整形加工統盤考慮，即應考慮孔的中心距和中心線間的平行度誤差。

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.

焊補修復，焊補前對工件預熱以及施焊時的焊接熱量都會引起工件的變形，所以應安排在前道工序；粘接修復，因粘補時某些粘接劑也需要加熱固化，因而也可能引起工件的變形；恢復整修加工基準，并檢測變形情況；鉗工修補，整形加工和鑲套等機加工。

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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