Ways to improve the fatigue strength of the main shaft of iron ore beneficiation equipment

Iron ore processing equipment to improve the way the spindle fatigue strength: in the design phase components, in addition to general measures taken to improve its strength, but also can improve the fatigue strength design by some of the following measures:

1 Reduce the effect of stress concentration on the spindle as much as possible. This is the primary measure and the main way to improve the fatigue strength. The sudden change in the shape and size of the main shaft (such as the shoulder) is the structural source of stress concentration. Therefore, in order to reduce the stress concentration, the structural shape and size of the part (ie, the main shaft) should be minimized to make changes as much as possible. Smooth and even. To this end, the fillet radius at the transition should be increased as much as possible; the change in stiffness at the adjacent section on the same shaft should be as small as possible. At the inevitable structure where a large stress concentration is to be generated, a relief groove can be used to reduce the influence of stress concentration.

2 Use materials with high fatigue strength and heat treatment methods and strengthening processes that can improve the fatigue strength of materials.

3 Improve the surface quality of the spindle. For example, the surface of the main shaft in a region with higher stress is processed more smoothly. Alternatively, if some of the shaft segments are working in corrosive media, proper surface protection is to be specified for the shaft segments.

4 As much as possible to reduce or eliminate the size of the initial crack that may occur on the surface of the main shaft, it has a more significant effect on improving the material performance for prolonging its fatigue life. Therefore, for important shaft sections, strict inspection methods and requirements should be specified on the design drawings.

5 Cooling and reducing load, adopting cooling design for the journal of the friction pair, can also significantly improve the fatigue life. Because the main shaft is a rotating part, after running for a certain number of weeks under low stress, it is gradually increased to the design stress level.

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Diallyldimethylaminium chloride (DADMAC) is a quaternary ammonium salt with the chemical formula (C3H5)2N(CH3)2Cl. It is a colorless to pale yellow liquid that is soluble in water and polar solvents.

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