TY - GEN
T1 - Development of low speed self-rotating nozzle system for drilling
AU - Kizaki, Akihisa
AU - Yokoi, K.
AU - Sakaguchi, K.
AU - Matsuki, K.
PY - 2012/2/13
Y1 - 2012/2/13
N2 - In this paper, a self-rotating waterjet nozzle system that has a vane pump for braking rotational speed of nozzle system was proposed, and a prototype of a nozzle system was developed. The nozzle system consists of a conventional self-rotating nozzle system and a vane-pump type brake system. To clarify the effect of choke valves, which were situated in the flow line between the discharge and suction ports of the vane pump, on the relation between the rotational torque and the rotational speed of nozzle system, a measurement of the rotational speed of nozzle system was conducted. The main results obtained in this study can be summarized as follows: The rotational speed of nozzle system obtained for the nozzle system with the vane-pump type brake system was much smaller than that obtained for the nozzle system without the brake system. In addition, the rotational speed of the nozzle system was decreased with decreasing the flow area of the choke valve. Accordingly, it is concluded that the developed vane-pump type brake system is effective for decreasing the rotational speed of the self-rotating nozzle system.
AB - In this paper, a self-rotating waterjet nozzle system that has a vane pump for braking rotational speed of nozzle system was proposed, and a prototype of a nozzle system was developed. The nozzle system consists of a conventional self-rotating nozzle system and a vane-pump type brake system. To clarify the effect of choke valves, which were situated in the flow line between the discharge and suction ports of the vane pump, on the relation between the rotational torque and the rotational speed of nozzle system, a measurement of the rotational speed of nozzle system was conducted. The main results obtained in this study can be summarized as follows: The rotational speed of nozzle system obtained for the nozzle system with the vane-pump type brake system was much smaller than that obtained for the nozzle system without the brake system. In addition, the rotational speed of the nozzle system was decreased with decreasing the flow area of the choke valve. Accordingly, it is concluded that the developed vane-pump type brake system is effective for decreasing the rotational speed of the self-rotating nozzle system.
KW - Blasting
KW - Bolts and anchors
KW - Mechanical excavation (TBM/RBM)
KW - Mining
KW - Tunneling
UR - http://www.scopus.com/inward/record.url?scp=84856714796&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84856714796&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84856714796
SN - 9780415804448
T3 - Harmonising Rock Engineering and the Environment - Proceedings of the 12th ISRM International Congress on Rock Mechanics
SP - 1719
EP - 1722
BT - Harmonising Rock Engineering and the Environment - Proceedings of the 12th ISRM International Congress on Rock Mechanics
T2 - 12th International Congress on Rock Mechanics of the International Society for Rock Mechanics, ISRM 2011
Y2 - 18 October 2011 through 21 October 2011
ER -