The characteristics of the construction machinery grinding period.
1. Quick wear
Due to the influence of new machine parts processing, assembly and adjustment, the friction surface is rough, the surface contact area is small and the surface pressure is uneven. Machine in the process of running, concave and convex part chimeric friction each other on the surface of the parts, grinding of metal debris fell down, and as an abrasive, continue to participate in friction, accelerate the abrasion on the surface of the parts with more. Therefore, it is easy to cause the wear and tear of the parts (especially the surface). At this time, if the overload operation, can cause the damage of the parts, the early failure.
2. Bad lubrication
As a result of the new assembly parts fit clearance is small, and due to reasons such as assembly, it is difficult to guarantee the uniformity of fit clearance, lubricating oil (grease) in less friction surface uniform oil film formation, to prevent wear and tear. It can reduce the lubrication efficiency and cause the early abnormal wear. In severe cases, the surface of friction or occlusion of the friction surface is caused by precision coordination, which leads to the occurrence of failure.
New processing and assembling of the parts, geometry shape and dimension deviation, exist at the beginning of the use, due to alternating load such as shock, vibration, and the influence of factors such as heat, deformation, and the wear too fast, easy to make the original loose fastening parts produced.
4. Leakage phenomenon
Due to the looseness, vibration and heat of the machine, the sealing surface of the machine and the pipe joints will leak. Some defects such as casting, machining, assembly and debugging is hard to find, but due to the vibration and impact in the process of operation, this kind of defects are exposed, show the leakage (permeability) oil (water). Therefore, it is easy to leak during the grinding period.
5. Error in operation
Due to the lack of understanding of the structure and performance of the machine (especially the new operator), it is easy to cause failure due to operation error, and even cause mechanical accident.