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Experimental study on specific energy consumption of rock crushing with different jet assisted cutting heads

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Document pages: 11 pages

Abstract: In order to study the specific energy consumption (SE) of rock crushing of different types of water jet auxiliary cutting heads and determine the optimal water jet parameters and auxiliary types, rock cutting with anhydrous jet was carried out on the rock crushing test-bed. Se is a comprehensive evaluation index, which is developed according to the load on the cutting head, and the se under different cutting conditions is compared and analyzed. The results show that the rock breaking strength assisted by anhydrous jet increases with the increase of rock compressive strength (RCS), but the limit drilling depth decreases. The water jet pressure has a significant effect on the se of rock broken by cutting head I, and the se decreases by 30 ∼ when the ratio between RCS and waterjet pressure was less than 1. However, the function of the waterjet assistance was poor; therefore, a ratio of 1 could be used to distinguish the rock breakage effect of cutting head I. For cutting head II, the rock damage from the waterjet impact was limited due to the large waterjet standoff distance; thus the rock breakage performance of cutting head II was also limited. The waterjet impacting at the tip of the conical pick using cutting head III could enter into the cracks caused by the mechanical pick and fracture the rock. Therefore, the rock breakage performance of cutting head III was better than that of cutting head II.

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