Common problems and use and protection of construction machinery during the running-in period - Chinahourly

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The running-in period is the main link to ensure the normal operation of the construction machinery, reduce the failure rate and extend its service life. However, at present, some users have neglected the special skill request of the new machine running-in period due to the lack of common sense of construction machinery or due to tight schedule, or to get the benefits as soon as possible. Some users even think that anyway, manufacturers have a repair period, the machine is broken by the manufacturer responsible for maintenance, so the machine is used for long-term overload during the running-in period, resulting in frequent machine failures, which not only affects the normal application of the machine, It shortens the service life of the machine and also affects the progress of the project due to machine damage. Therefore, the use and maintenance of the running-in period of construction machinery should cause sufficient weight. Construction machinery running-in period

1, fast wear rate

Due to the influence of factors such as processing, assembly and adjustment of new machine parts, the friction surface is rough, the contact area of ​​the mating surface is small, and the pressure state of the surface is uneven. During the running process of the machine, the concave and convex parts of the surface of the part are frictionally engaged with each other, and the ground metal scraps, as abrasives, continue to participate in the friction, which accelerates the wear of the mating surface of the parts. Therefore, during the running-in period, the wear of the parts (especially the matching surface) is easily caused, and the wear speed is fast. At this time, if the operation is overloaded, it may cause damage to the components and cause an early failure.

2, poor lubrication

Since the matching gap of the newly assembled components is small, and it is difficult to ensure the uniformity of the matching gap due to assembly and the like, the lubricating oil (fat) does not easily form a uniform oil film on the friction surface to prohibit wear. Thereby reducing the lubrication efficiency, resulting in early abnormal wear of the machine. In severe cases, the friction surface of the precision fit may be scratched or bitten, resulting in failure.

3, the production is loose

The newly processed and assembled parts have deviations in geometric shape and matching size. In the initial stage of application, due to the alternating load such as impact and vibration, as well as the influence of heat and deformation, and the excessive wear and tear, it is easy to make The parts that were originally tightened are loose.

4. Leakage occurs

Due to the looseness of the machine, the vibration and the influence of the heat of the machine, the sealing surface of the machine and the pipe joints will show leakage; some defects such as casting and processing are difficult to invent during assembly and debugging, but due to vibration during the operation process. Impact, this shortcoming is exposed, expressed as leakage (seepage) oil (water). Therefore, leakage occurs easily during the running-in period.

5, more operational errors

Due to insufficient understanding of the structure and performance of the machine (especially new operators), it is easy to cause malfunctions due to operational errors, and even cause mechanical accidents.

1. Since the construction machinery is a special vehicle, the operation staff should receive the training and leadership of the manufacturer, have sufficient knowledge of the structure and performance of the machine, and obtain the necessary operation and maintenance experience before operating the machine. The product use protection explanation book supplied by the manufacturer is an indispensable material for the operator to operate the equipment. Before operating the machine, it is necessary to first browse the use of the protection clarification book and operate and support it according to the request of the clarification book.

2. Pay attention to the working load during the running-in period. The working load during the running-in period should not exceed 80% of the rated working load, and the appropriate workload should be deployed to prevent the overheating caused by the long-term operation of the machine.

3. Pay attention to the inspection of each instrument and present an abnormality. It should be stopped in time to eliminate it. If the cause is not found and the fault is not eliminated, the operation should be finished.

The running-in period is the main link to ensure the normal operation of the construction machinery, reduce the failure rate and extend its service life. However, at present, some users have neglected the special skill request of the new machine running-in period due to the lack of common sense of construction machinery or due to tight schedule, or to get the benefits as soon as possible. Some users even think that anyway, manufacturers have a repair period, the machine is broken by the manufacturer responsible for maintenance, so the machine is used for long-term overload during the running-in period, resulting in frequent machine failures, which not only affects the normal application of the machine, It shortens the service life of the machine and also affects the progress of the project due to machine damage. Therefore, the use and maintenance of the running-in period of construction machinery should cause sufficient weight.