The running-in time of a new crane is generally about 60 hours, which is stipulated by the manufacturer according to the technical characteristics of the crane for the first time. The manufacturer has a warranty period, and the manufacturer is responsible for repairing the damaged machine. Therefore, the machine is overloaded for a long time during the running-in period, resulting in frequent and early failures of the machine. This not only affects the normal use of the machine, but also shortens the service life of the machine. And because of damage to the machine, the progress of the project was affected. Therefore, the use and maintenance of the crane during the running-in period should attract enough attention. Let me introduce to you the precautions of the crane running-in period.
1.The number of control operation errors. Due to insufficient understanding of the structure and performance of the crane, it is easy to cause malfunctions due to operating errors, and even cause mechanical accidents.
2. Avoid poor lubrication. Since the fitting clearance of newly assembled parts is small, and due to assembly and other reasons, it is difficult to ensure the uniformity of the fitting clearance, and it is difficult for lubricating oil to form a uniform oil film on the friction surface to prevent wear. Thereby reducing the lubrication efficiency, causing the early abnormal wear of the machine parts. In severe cases, it will cause scratches or seizures on the friction surface of the precision fit, leading to failure.
3. Regularly check to avoid looseness. The newly processed parts have deviations in geometric dimensions and matching dimensions. In the early stage of use, due to the influence of alternating loads such as impact and vibration, as well as the influence of heat and deformation, plus excessive wear and other reasons, it is easy to loosen the originally fastened parts.
4. Prevent leakage. Due to the loosening, vibration and heat generation of the machine, the sealing surface of the machine and the pipe joints will leak; some casting and processing defects are difficult to find during assembly and debugging, but due to vibration and shock during operation, this defect is exposed and manifests as Oil spill. Therefore, leakage is likely to occur during running-in.
5. Wear rate. Due to the influence of new machine parts processing, assembly, adjustment and other factors, the friction surface of the crane is rough, the contact area of the mating surface is small, and the surface pressure is uneven. During the operation of the machine, the uneven parts on the surface of the parts cooperate and rub each other, and the fallen metal fragments continue to participate in the friction as abrasives, accelerating the wear of the mating surfaces of the parts. Therefore, it is easy to cause the parts to wear during the running-in process, and the wear rate is fast. At this time, if it is overloaded, it may cause damage to the parts and cause early failure.