The Study Of Multi-Pipe Lunar Soil Drilling-Sampling Technology

For the national subject of the ChanE——ⅢLunar Exploration, the lander is required to be small-sized and light-weighted, takes out the solution of multi-pipe lunar soil drilling-sampling system, which fulfilled the requirements and the sampling depth can be controlled. Based on the analysis and decomposition taken on this system, the subject finished the detailed structural design, established a virtual prototype system model on the soft platform of ADAMS, and finished kinematics simulation with it. And using a real prototype system more experiments on two-pipe connecting process are taken on a testing platform.Firstly, via decomposing the working principle of the system, it is deconstructed into three parts, the driving part, the pipe storage part, and the intermittent translocation part. Beyond the three parts there are three key technologies including multi-pole jointing, sampling structure, and drilling pipe holding structure. On this basis, this paper finished the structure design of the multi-pipe storage mechanism, the multi-pipe fixing mechanism, the driving mechanism and the sampling mechanism.Secondly, detail design and analysis on subsystems base on the overall plan. Using Geotechnical Drilling mechanics, this paper theoretically analyzed the diameter of the drill pipe, spiral angle, pitch and other structural parameters, and designed the connecting structure between the pipes and between pipe and drilling head including the drilling structure. The structure and parameter design of the driving is based on the calculation on the motor drive power of the drilling system and footage system. To meet the need of the overall system requirement, the indexing mechanism is designed to be a Geneva gear form, more detailed structural and parametric study is also done in this paper.Thirdly, based on the detailed structural design, Simulation and Verification is taken on some key components. Using Abaqus, this paper take a static load simulation on the drilling head facing a theoretical load, which comes out to meet requirements of structural strength and rigidity. Base on the right choosing of each driving motor, according to the system timing of work, using Proteus electronic circuit design and simulation software and Keil compiler software to take a simulation on the control of motor timing to verify the feasibility of it.Using Pro/E software, three-dimensional solid model is made, and the model is imported to the ADAMS software to take kinematics simulation, and it carried out to verify there are no movement interference problems. More dynamics simulation is taken on the grip and docking process, and the footage motor and drilling motor power are simulated, under the condition of all the six pipes completed the drilling.The simulation results show that the structural designing meets the requirement of each component, and the driving system meets the power requirements. In the end of the subject, two-pipe connecting and drilling head sampling experiments is taken on a testing platform. The results show that the design of multi-pipe drilling and sampling system is feasible.