Dry pneumatic down-the-hole drill model

The utilization of pneumatic DTH hammer drilling is the most efficient approach to rescue miners. The previous DTH hammer's impact model was simplified and the analysis of impact parameters was incomplete, hi. [pdf]

Twin screw air compressor large pressure difference treatment

According to screw compressor manufacturers, treatment is closing the ball valve to verify that the rated pressure can be attained and inspecting the air compressor component to prevent issues with that component constituting the treatment procedure. [pdf]