After construction machinery leaves the factory, it is generally stipulated that there is a running-in period of about 60 hours (some are called break-in period).

Run-in period), which is stipulated by the manufacturing plant based on the technical characteristics of the construction machinery at the initial stage of use.

The running-in period is to ensure the normal operation of construction machinery, reduce the failure rate and extend its service life

main link. But at present, due to the lack of common sense of construction machinery use by some users or due to

The construction period is tight, or you want to get benefits as soon as possible, but ignore the special technical requirements of the running-in period of the new machine.

Some users even think that, anyway, the manufacturer has a warranty period, and the manufacturer is responsible for repairing the machine if it breaks down.

Therefore, the machine will be overloaded for a long time during the running-in period, resulting in frequent failures in the early stage of the machine

produced, which not only affects the normal application of the machine, shortens the service life of the machine, but

Moreover, due to machine damage, the progress of the project was affected. Therefore, the running-in period of construction machinery

The use and maintenance should be given full attention.

Features of the break-in period:

1. Fast wear?

Due to the influence of factors such as processing, assembly and adjustment of new machine parts, its friction

The rubbing surface is rough, the contact area of the mating surface is small, and the pressure bearing state of the surface is uneven. machine in

During operation, the concave and convex parts on the surface of the parts fit and rub against each other, grinding the fallen metal.

Debris, as an abrasive, continues to participate in friction and accelerates the wear of the mating surfaces of parts.

Therefore, it is easy to cause wear of parts (especially mating surfaces) during the running-in period, and the wear speed

fast. At this time, if the work is overloaded, it may cause damage to the parts and premature

period failure.

2. Poor lubrication?

Due to the small fitting clearance of the newly assembled parts, and due to the original assembly and other factors.

Therefore, it is difficult to ensure the uniformity of the fit gap, and the lubricating oil (grease) is not easy to form on the friction surface

Uniform oil film to prevent wear. Thereby reducing the lubrication performance, resulting in early abnormal parts

Often wear and tear. In severe cases, it will cause scratches or bites on the friction surface of the precision fit, resulting in

malfunction occurs.

3. Loose

The newly processed and assembled parts have deviations in geometric shape and matching dimensions.

In the initial stage of application, due to alternating loads such as shock and vibration, as well as heat and deformation, etc.

Influenced by other factors, coupled with excessive wear and tear, etc., it is easy to cause the parts that were originally fastened to break down.

loose.

4. Leakage occurs

Due to the looseness of parts, vibration and the influence of heat on the machine, there will be leakage on the sealing surface of the machine and pipe joints; some defects such as casting and processing are difficult to find during assembly and debugging, but due to the vibration during the operation , Impact action, this defect is exposed, expressed as leakage (seepage) oil (water). Therefore, leakage is prone to occur during the running-in period.

5. Many operating errors

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