In the drilling operation of a mini borehole drilling machine, slow drilling speed is a common fault that directly affects construction efficiency. There are many reasons for this problem, and they need to be investigated one by one based on the actual situation. The following are several common causes and their corresponding solutions.
Firstly, insufficient air volume and low air pressure are common causes of slow drilling. At this time, the air supply system should be inspected, the air supply volume increased, and each joint carefully checked for air leakage. Damaged parts should be repaired or replaced in a timely manner.
Secondly, overly thin or long air supply pipelines can also affect drilling efficiency. Thin pipelines restrict the flow of air, while long ones cause pressure loss. The solution is to replace the air ducts with larger diameters and shorten the air supply lines as much as possible to ensure sufficient air pressure and flow.
Insufficient thrust can also lead to difficulties in drilling. The operator should appropriately increase the pushing force to ensure that the drill bit maintains sufficient contact pressure with the rock, thereby enhancing the crushing efficiency.
If the borehole shifts, the impactor and drill pipe will rub against the edge of the hole while operating inside, causing a significant increase in resistance. At this point, the position of the frame should be adjusted immediately, the thrust force appropriately reduced, and the drill tool rotated and moved up and down simultaneously to smooth the hole wall and restore the normal drilling trajectory.
Drill bit wear is another factor that is often overlooked. Drills that have been used for a long time will become blunt due to wear and lose their cutting ability. When this happens, the drill bit should be ground in time or replaced with a new one directly.
In addition, wear of the internal parts of the impactor can also reduce the impact energy. It is recommended to disassemble the impactor for cleaning and inspection. Any parts found to be severely worn should be replaced.
Finally, excessive moisture in the air receiver or ice formation in the pipelines during winter can also impede the smooth flow of gas. It is necessary to drain the water from the air receiver in a timely manner and remove the ice from the pipelines to ensure the normal operation of the gas supply system.
To sum up, a slow drilling speed is often the result of multiple factors working together. Only by conducting a systematic investigation and addressing the specific issues can the drilling efficiency be quickly restored and the construction proceed smoothly.
