Mechanical equipment for drilling water wells and completing operations such as downhole pipe and well washing. Including power equipment and drill bits, drill pipes, core pipes, drill stands, etc. Generally divided into three categories: rotary, impact drill, and compound rotary. The manufacturer of water well drilling tools introduces the precautions for use and maintenance of water well drilling tools during the running-in period:

　　After the water well drilling tools leave the factory, there is generally a running-in period of about 60 hours (some called the running-in period), which is stipulated by the manufacturing plant according to the technical characteristics of the engineering drilling rig at the initial stage of use. The running-in period is an important link to ensure the normal operation of the engineering drilling rig, reduce the failure rate, and extend its service life. But at present, some users ignore the special technical requirements of the new machine's running-in period due to a lack of common sense of the use of engineering drilling rigs or because of the tight schedule or want to obtain profits as soon as possible. Some users even think that anyway, the manufacturer has a warranty period, and the manufacturer is responsible for repairing the machine if it is broken, so the machine is overloaded with a long time during the running-in period, resulting in the frequent occurrence of early machine failures, which not only affects the normal use of the machine, The service life of the machine was shortened, and the progress of the project was affected by the damage of the machine. Therefore, full attention should be paid to the use and maintenance of engineering drilling rigs during the running-in period.

　　1. The characteristics of the running-in period:

　　1. Loose

　　Newly processed and assembled parts and components have deviations in geometric shapes and matching dimensions. In the early stage of use, due to the impact of alternating loads such as shock and vibration, as well as the influence of factors such as heat and deformation, and excessive wear and other reasons, they are easy to cause The originally fastened parts are loose.

　　2. Fast wear

　　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 surface pressure 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 chips that fall off are used as abrasives to continue to participate in the friction and accelerate the wear of the mating surface of the parts. Therefore, the parts (especially the mating surfaces) are easily worn during the running-in period, and the wear rate is fast. At this time, if overloading is performed, it may cause damage to parts and cause early failure.

　　3. Leakage occurs

　　Due to the loosening of the parts, vibration, and the influence of the heat of the machine, there will be leakage at the sealing surface of the machine and the 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, this defect is exposed, manifested as leakage (seepage) of oil (water). Therefore, leakage is prone to occur to the running-in period.

　　4. Many operational errors

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

　　5. Poor lubrication

　　Because 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. Lubricant (grease) is not easy to form a uniform oil film on the friction surface to prevent wear. Thereby reducing the lubrication efficiency, causing 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 failures.