Patent ID: 11913336
Assignee: NORTHWESTERN UNIVERSITY
Field: Civil engineering (Other fields)
Classification: CPC E  H | IPC E  H

Claim 5:
6. A method of using the low-power microwave coring machine suitable for lunar rocks according to claim 1, comprising the following steps:
step 1: switching on a microwave generator and not starting tunneling drivers and a rotary driver, wherein properties of the rock stratum in regions irradiated by four microwave power output ends is determined by reflection coefficients fed back by the four microwave power output ends, and when the reflection coefficients of the four microwave power output ends do not have differences, the properties of the rock stratum in the regions are consistent; when the reflection coefficients of the four microwave power output ends have significant differences, large reflection coefficients represent that the rock stratum of the regions having large reflection coefficients have high compactness; and in order to prevent a drill drum from directly drilling hard rocks to cause drilling deviation when not having side wall constraint, regions having small reflection coefficients and not having differences are selected to start drilling work;
step 2: starting the tunneling drivers and the rotary driver, wherein a change of the properties of the rock stratum along with a drilling depth is determined according to the reflection coefficients fed back by the four microwave power output ends; and when the reflection coefficients increase suddenly to exceed a maximum bearing reflection coefficient A of the microwave generator, a reflection power reaches a half of a full-load power, a controller controls the power of the microwave generator to decrease, damage of the microwave generator caused by too large reflection is avoided, and a propelling speed of the drill drum is decreased, so that the power is decreased, time is prolonged, and crack of the lunar rocks is caused by microwave irradiation; and
step 3: in a continuous drilling process, if the drill drum encounters sticking of drill tools, switching off the tunneling drivers and the rotary driver, wherein the microwave power output ends having small reflection coefficients are switched off according to the reflection coefficients fed back by the four microwave power output ends, then the power of the microwave power output ends having large reflection coefficients is gradually increased, the reflection coefficients are guaranteed not to exceed A, and after presplitting and loosening of the drill drum are completed in the regions of the microwave power output ends, the four microwave power output ends, the tunneling drivers and the rotary driver are switched on once again; and when the drilling depth reaches a sample requirement length, the drilling work is completed, and the microwave generator, the tunneling drivers and the rotary driver are switched off.