The new down-the-hole drilling opportunity has a running-in period, what are its characteristics?

Classification:

Industry dynamics

Release time:

2021-06-16

【Summary Description】 Full attention should be paid to the use and maintenance of the running-in period of the down-the-hole drill and the impactor.

The running-in period is an important link to ensure the normal operation of the down-the-hole drill and the impact device, reduce the failure rate and extend its service life. However, at present, some users ignore the special technical requirements of the new machine running-in period due to lack of common sense in the use of down-the-hole drills and impactors, or because of tight construction period or because they want to get profits as soon as possible. Therefore, the use and maintenance of the running-in period of the down-the-hole drill and the impactor should be paid full attention.

characteristics of 1. running in period:

1Loose

The newly processed and assembled parts have deviations in geometric shape and matching dimensions. In the early stage of use, due to the impact, vibration and other alternating loads, as well as the influence of heat, deformation and other factors, coupled with rapid wear and other reasons, it is easy to Make the original fastened parts loose.

2. Wear fast

Due to the influence of the processing, assembly and adjustment of the new machine parts, the friction surface is rough, the contact area of the mating surface is small, and the pressure condition of the surface is uneven. During the operation of the machine, the concave and convex parts of the surface of the parts fit and rub each other, and the metal debris that falls from the grinding is used as abrasive to continue to participate in friction, which accelerates the wear of the mating surface of the parts. Therefore, the content of the run-in period is easy to cause parts and components.(Especially mating surfaces)The wear, wear fast. At this time, if the overload operation, it may lead to damage to the parts, resulting in early failure.

3Leakage occurs

Due to the loosening of mechanical parts, vibration and the influence of heat on the machine, leakage will occur 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 vibration during operation, This kind of defect is exposed, manifested as leakage(infiltration)Oil(Water). Therefore, the running-in period is prone to leakage.

4. Many operational errors

Due to the lack of 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.

5Poor lubrication

Because the fit clearance of the newly assembled parts is small, and due to assembly and other reasons, it is difficult to ensure the uniformity of the fit clearance.(Grease)It is not easy to form a uniform oil film on the friction surface to prevent wear. Thereby reducing the lubrication efficiency, resulting in early abnormal wear of the machine parts. In severe cases, it will cause the friction surface of the precise fit to scratch or bite, resulting in failure.

Key words:

weilida drill