Due to factors such as the machining, assembly, and adjustment of components in new mining transport vehicles, their friction surfaces are rough, the contact area of mating surfaces is small, and the surface stress distribution is uneven. During operation, the uneven protrusions and depressions on component surfaces interlock and rub against each other. The metal debris generated by abrasion then acts as an abrasive and continues to participate in friction, which further accelerates the wear of component mating surfaces.
Therefore, parts (especially mating surfaces) are prone to wear and tear at a faster rate during the running-in period. Operating the vehicle under overload at this stage may cause component damage and lead to early malfunctions.
Due to the small mating clearances of newly assembled components in mining transport vehicles, coupled with various operating methods and natural conditions, it is difficult to ensure the uniformity of mating clearances. Lubricating oil (or grease) cannot easily form a uniform oil film on friction surfaces to prevent wear. This reduces lubrication efficiency and causes early abnormal wear of parts.
In severe cases, it may lead to scratches or pitting corrosion on the friction surfaces of precision-fit components, resulting in equipment malfunctions.
Newly machined and assembled components of mining transport vehicles have deviations in geometric shape and fitting tolerances. In the initial stage of use, affected by alternating loads such as impact and vibration, as well as factors like heating and deformation, coupled with rapid wear, the originally tightened components are prone to loosening.
Affected by component loosening, vibration, and equipment heating, leakage can occur at the sealing surfaces and joints of the vehicle. Some defects from casting and machining are difficult to detect during assembly and adjustment. However, such flaws become exposed due to vibration and impact during operation, manifesting as oil or water leaks (or seepage). Therefore, leakage issues are prone to happen during the running-in period.
Due to insufficient understanding of the equipment’s structure and performance (especially among new operators), improper operation is likely to cause malfunctions, and even rough operation may lead to mechanical accidents. In addition, operators may fail to adapt to the operation methods and habits of different types of equipment.
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