Structural Design and Parameter Optimization of Percussion PDM Drill
In order to efficiently drill into hard rock formations,a percussion PDM drill was developed by combining the high torque of PDM drill with the high frequency and low amplitude impact property of axial percus-sion tool.On the basis of discussing the principle of tool structure,a motion control equation for the demolition hammer of axial percussion pup joint was established to analyze the motion characteristics of the demolition hammer.Then,taking the ballistic work and maximum energy utilization ratio as evaluation indicators,the orthogonal test method was used to conduct optimization research on the main tool structure parameters.The research results show that the reciprocation of the demolition hammer is a nonlinear accelerated motion with gradually decreasing accelera-tion.The diameter of the throttle nozzle and the stroke of the demolition hammer motion are the main factors affect-ing the ballistic work,while the mass and bearing area of the demolition hammer and the through-hole area of the cavity are minor factors.The diameter of the throttle nozzle and the bearing area of the demolition hammer are the main factors affecting the maximum energy utilization ratio,while the stroke of the demolition hammer motion,the mass of the demolition hammer and the through-hole of the cavity are minor factors.The conclusions provide refer-ence for further optimization design and field application of percussion PDM drill.
percussion PDM drill toolmotion characteristicorthogonal testballistic workmaximum en-ergy utilization ratio
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