The Researches On The Mechanism Of The Drilling Screw Drill Tool Row Of Powder To The Moon

The international lunar exploration becomes increasingly active since thebeginning of the21st century. In order to unlock mysteries of the outer space as muchas possible, our country has focused on the lunar exploration program and stepped upits implement in recent years. The gravity of the moon is only1/6of the earth andthere is no water and air but the high-density lunar soil on the moon. Considering ofconditions on the lunar surface, the most effective sampling method is to use thehollow outer auger with rotary percussion drilling for sampling. The drilling effectand efficiency of the spiral auger is mainly affected by the capacity of the auger stemtransmission. The drilling environment on the moon is very special. It is not allowedrepeated experiments and unsuccessful drilling sampling, and landing on the moon isalways with a huge consumption of goods and materials. Therefore for the urgentrequest of China’s lunar exploration program, study on the auger conveyingmechanism and the correctness and reliability of the theory is an extremely importantand far-reaching research subject.The capacity of hollow auger stem transmission is not only related to thestructural parameters of screw drilling tools, but also related to mechanical parametersof the lunar soil and the drilling program parameters. In order to analyze therelationship between above parameters during the lunar soil transportation, this thesisfirst got the mathematical relationship between each parameter through the kinematicsand mechanics analysis in the process of conveying lunar soil, and established a newmechanical model; then the paper showed the relation between each parameter byMATLAB software, and found the interaction relationship between parameters. Hereset the auger conveying efficiency as objective function, with helix angle, radius ofdrill pipe, drill pipe, angular velocity as variables, optimizing with MATLAB fmincon () function. The result showed optimal drill pipe structure parameters and drillingprogram parameters. It made the auger conveying efficiency rising1.86times; finallythe paper verified the correctness and reliability of the theory by the indoor model testwhich showed the experimental value were in conformity with the theoretical value.Then the theory of the auger conveyor was corrected by the data in the test, and thecorrected result made the theory more accurate.In theoretical derivation, this thesis did the theoretical analysis and deductioncombining with previous ignored or inadequate auger conveying mechanism, anddefined the volume of spiral drill critical angle speed based on "the same volumeprinciple". The energy transfer diagram was derived from the power derivation, andhelped clarified the complex relationship of energy consumption, avoiding themiscount and omission caused by the unclear relationship of energy consumption.This thesis not only perfected the auger conveying theory, but also optimized thestructural parameters of spiral drill pipe and drilling program parameters on the basisof the theory. It can be sure that the achievement in this theory has high applicationvalue in the improvement of auger transmission capacity.