Results 141 to 150 of about 333 (189)

Development of a rotary-percussive drilling mechanism (RPDM)

2012 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2012
A project named Chang'e is currently aiming to accomplish acquiring the lunar soil through automated robotic device. Therefore, many engineers are attempting to develop a kind of prototype of lunar soil coring for the mission. This paper presents a Rotary-percussive Drilling Mechanism (RPDM) which is a novel scheme for driving unit in the deep lunar ...
Qiquan Quan, Peng Li, Shengyuan Jiang, Xuyan Hou, Dewei Tang, Zongquan Deng, Weiwei Zhang 0009   +6 more
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A Rotary-Percussive Ultrasonic Drill for planetary rock sampling

2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2016
Conventional ultrasonic drills can drill into rocks using high frequency axial vibration, which feature lower power and lower preload force, thus they could become a very attractive solution for future deep-space exploration. However, drill cuttings cannot be removed effectively with the increase of drilling depth by conventional ultrasonic drills that
Yinchao Wang, He Li 0005, Deen Bai, Qiquan Quan, Hongying Yu, Dewei Tang, Zongquan Deng   +6 more
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The Technique of Auger-Percussive-Rotary Drilling Research

2013 Fifth International Conference on Measuring Technology and Mechatronics Automation, 2013
A new drilling technique used in a wider range of application auger-percussive-rotary drilling technique is defined based on operation experiences and combined with the theoretical analysis in the anchor engineering of soil and rock. After summarizing the advances of this technique some existing problems encountered in practice are presented to improve.
null Wu Zhang, null Shi Zhi-Jun
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A SELF-EXCITED SYSTEM FOR PERCUSSIVE-ROTARY DRILLING

Journal of Sound and Vibration, 2003
Abstract A dynamic model for a new principle of percussive-rotary drilling is presented. This is a non-linear mechanical system with two degrees of freedom, in which friction-induced vibration is used for excitation of impacts, which influence the parameters of stick–slip motion.
A.D. BATAKO, V.I. BABITSKY, N.A. HALLIWELL   +2 more
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The effectiveness of indexing in percussion and rotary drilling

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1966
Abstract Considerable light is focused in this investigation on the mechanics of indexing and its quantitative relation to the drilling process. Following are the principal conclusions: 1. (i) In rock drilling with impact (percussion and roller-bit) tools, indexing does not play a major role in affecting the drilling process or in influencing ...
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Optimization of Rotary Axial Percussion Drilling

Journal of Vibration and Acoustics
Abstract Rotary axial percussion drilling is a high-speed drilling technology that has been widely applied. However, the traditional single-impactor arrangement has low drilling efficiency, is prone to intensify drillstring vibration, and increases the risk of drillstring failure.
Zhiming Li, Xiao Tian, Jin Wang
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Research on a Rotary-Percussive Coring Drill for Lunar Exploration

Applied Mechanics and Materials, 2012
China is launching the Chang'e project to send automated machine for acquiring the lunar soil and returning to the earth. Thus, we are trying to develop a kind of effective mechanism for the exploration mission of lunar soil coring. This paper presents a rotary-percussive coring drill which is a novel scheme for the deep surface soil acquirement.
S. Li, Q. Quan, De Wei Tang, S. Jiang, X. Hou, Z. Deng   +5 more
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Drilling rate of rotary percussion drill bits and rock characteristics

Journal of Terramechanics, 1988
Abstract Fourteen kinds of rock specimen and rock mass were tested to find the main rock mass characteristics affecting the drilling rate of a bit in rotary percussion by 2 hand-type electric and air hammer drills. It was found that the drilling rate of the bit, V (cm/min), consuming constant rotary percussion power of 1050 W could be expressed as ...
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A unified prediction model for percussive and rotary drilling

Mining Science and Technology, 1985
Abstract This paper presents and compares the various equations for predicting the performance of percussive and oilwell rotary drilling machines. The use of the concept of specific energy for predicting the performance of drilling machines is critically discussed.
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State and Prospects of the Percussive-Rotary Blasthole Drilling in Quarries

Journal of Mining Science, 2004
Methods of drilling in quarries are analyzed. The possibilities are estimated for the downhole pneumatic punchers designed in the Institute of Mining of the Siberian Branch of the Russian Academy of Sciences with a new working cycle and increased energy parameters.
A. S. Tanaino, A. A. Lipin
openaire   +1 more source