Common forms of wear of the stirring paddle of the stock solution preparation system

1. Abrasive wear:
Cause: During the working process, the stirring paddle rubs and collides with the solid particles in the dye (such as pigment particles, additive particles, etc.). These solid particles will scratch and wear the surface of the stirring paddle, causing the material on the surface of the stirring paddle to be gradually worn away, just like rubbing the surface of an object with sandpaper.
Influence: Abrasive wear will make the surface of the stirring paddle rough, reduce the smoothness of the stirring paddle, and then affect the stirring effect, resulting in uneven mixing of dyes. At the same time, as the wear intensifies, the size of the stirring paddle will gradually decrease, which may affect the matching accuracy of the stirring paddle and other parts inside the mixer, further affecting the normal operation of the equipment.
2. Corrosive wear:
Cause: If the dye has a certain degree of corrosiveness, or there are corrosive substances in the working environment (such as humid air, chemical gases, etc.), the metal material on the surface of the stirring paddle will react chemically with these corrosive substances to form corrosion products. These corrosion products are usually loose and easy to fall off from the surface of the stirring paddle, causing the material on the surface of the stirring paddle to be gradually corroded, forming corrosive wear.
Impact: Corrosion and wear will not only destroy the surface structure of the stirring paddle, reduce the strength and hardness of the stirring paddle, but also may affect the dynamic balance of the stirring paddle, resulting in increased vibration and noise of the equipment. In addition, corrosion products may be mixed into the dye, which will have an adverse effect on the quality of the dye, such as causing the dye to change color and deteriorate.
3. Fatigue wear:
Cause: During the long-term rotation of the stirring paddle, it will be subjected to periodic stress, just like repeatedly bending a wire, and the microstructure inside the stirring paddle will gradually crack and damage. Over time, these cracks will continue to expand and connect, eventually causing the material on the surface of the stirring paddle to fall off, forming fatigue wear.
Impact: Fatigue wear usually occurs at the root of the stirring paddle or other stress-concentrated parts, such as the connection between the stirring paddle and the stirring shaft. Once fatigue wear occurs, the stirring paddle may suddenly break, causing equipment failure and affecting the normal production. In addition, fatigue wear will also reduce the service life of the stirring paddle and increase the maintenance cost and downtime of the equipment.
4. Erosion wear:
Cause: During the dye mixing process, the high-speed rotation of the stirring paddle will cause the dye to flow and impact strongly, just like water hitting the river bank. This high-speed flow of dye will scour and wear the surface of the stirring paddle, causing the material on the surface of the stirring paddle to be gradually eroded, forming erosion wear.
Impact: Erosion wear will cause grooves, pits and other damages on the surface of the stirring paddle, destroy the shape and dimensional accuracy of the stirring paddle, and affect the stirring effect and work efficiency of the stirring paddle. At the same time, erosion wear may also increase the roughness of the stirring paddle surface, further aggravating the degree of abrasive wear and corrosive wear.
5. Cavitation wear:
Cause: When the stirring paddle rotates in the liquid, bubbles in the liquid will form and burst near the surface of the stirring paddle. When the bubbles burst, instantaneous high temperature and high pressure will be generated, which will have a strong impact and corrosion on the surface of the stirring paddle, causing the material on the surface of the stirring paddle to be gradually cavitated, forming cavitation wear.
Impact: Cavitation wear usually occurs at the blade edge and back of the stirring paddle, which are prone to form negative pressure areas, leading to the formation and collapse of bubbles. Cavitation wear will cause honeycomb-shaped holes and pits to appear on the surface of the agitator paddle, seriously affecting the strength and performance of the agitator paddle, and may even cause the agitator paddle to break and be damaged.