Authors:
Qiuyi Fang
1
;
Qin Zhou
2
;
Jianguo Lv
2
and
Jing Wang
3
Affiliations:
1
Sergeant school of CAPF; #377 Tianmu Shan Road, Xihu District and Hangzhou, China
;
2
China University of Geosciences, Beijing; #29 Xueyuan Road, Haidian District and Beijing, China
;
3
Sinomine Resource Exploration；#11 Changchunqiao Road, Haidian District and Beijing, China
Keyword(s):
Coring mechanism, mechanical model, bedding information-keeping, structure optimization
Abstract:
The soft bag lunar soil coring mechanism of turning inward type without sliding has the characteristics of simple structure, low power dissipation and well regolith bedding information-keeping. However, at the initial coring stage, the large pulling force and torque, which are resulted from the spiral movement of lunar soil around bit when it enters the holding-pipe, can consequently cause high power dissipation and bad regolith bedding information-keeping. In the paper, in order to achieve the goal of the minimum of pulling force and torque, a mechanical model representing the interaction of lunar soil on coring mechanism was established to analyze effects of structural parameters and drilling parameters on the pulling force and torque. The structural parameters of coring mechanism and drilling parameters were optimized. The results show that soft bag thickness and guide head radius have the greater impact on the pulling force and on the torque respectively. When the guide head radi
us is 0.5mm and the soft bag thickness is 0.2mm, the rope pulling force can reach its optimal value of 89N, which can greatly reduce the degree of torsion in the process of coring.
(More)