Effective transfer of rock drilling capacity and pressure mode of rotary drilling rig and basic requirements for drill pipe

When the rotary drilling rig enters the rock drilling, the torque and pressure of the equipment and the pressure mode are transmitted on the rock through the drill pipe. The drill pipe plays a vital role in the host capacity and the transmission of the rock. . In order to achieve the impact on the rock, the operator must control the pressurizing device to pressurize, decompress, and float the drill pipe to cause the rock to be impacted. If this pulsed pressing force is absorbed by the elastic deformation of the structure during the transfer, the rock will not be effectively impacted. In this test, it is a single-section drill pipe, which is beneficial to transmit the controllable drilling pressure. Figure 2 is a reasonable rock-injection pressure mode. The pressure may be attenuated by the transmission of the multi-layer rod in the large and small cycles, and the multi-layer drill pipe is transmitted. The pressure mode problem needs to be considered. The less the number of drill pipe layers is, the better the impact of the drilling machine on the rock impact. When the multi-layer drill pipe is not fully extended, the rigidity of the drill pipe buffer spring is more favorable for the transmission of the pulse drilling pressure. Excessive drilling pressure at the peak of the pulse drilling pressure may cause local instability of the drill pipe or fatigue fracture due to repeated partial compression of the radial alternating load due to instability. Therefore, the drill pipe body should be thickened to enhance the radial deformation resistance; the material elasticity should be increased to enhance the fatigue resistance under alternating load.