Zobrazeno 1 - 10
of 75
pro vyhledávání: '"Hammer drill"'
Publikováno v:
Applied Sciences, Vol 14, Iss 23, p 11184 (2024)
Down-the-hole (DTH) hammer drilling has high rock-breaking efficiency and a decisive advantage in hard rock drilling, which can reduce the cost of geothermal drilling. However, when the drill bit rotation speed and the DTH percussion frequency do not
Externí odkaz:
https://doaj.org/article/e2cd6c89c2844a0e82d70510606117d4
Akademický článek
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Autor:
Z. Zahzouh, N. Souilah
Publikováno v:
Journal of Fundamental and Applied Sciences; Vol. 13 No. 1 (2021); 151-171
Consumption of raw materials has steadily increased. Rich countries explore several raw materials such as phosphate, ore and copper. For this, exploitations must be large, highly mechanized and produce in large quantities to be profitable. Also, the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c602f6efbbdea9be1e9c582d96674a5
https://doi.org/10.4314/jfas.v13i1.9
https://doi.org/10.4314/jfas.v13i1.9
Autor:
Elias Hadjadj Aoul, Samia Nemouchi
Publikováno v:
Acta Universitatis Sapientiae, Electrical and Mechanical Engineering. 12:77-85
The factors which influence the performance characteristics of a hammer drill are examined; drilling data are analyzed to determine these factors. Methods for selecting the appropriate drilling are also highlighted. Two models are used in order to co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::793258e4341e21c2edabe5cb19a1d2ea
https://doi.org/10.2478/auseme-2020-0006
https://doi.org/10.2478/auseme-2020-0006
Autor:
Hållström, Erik
Top hammer drilling uses a percussive force at the top combined with a rotational energy that transmits through a rod to a drill bit that crushes rock. It is a drilling method that is preliminary used in mining, construction and operations under grou
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-488634
Publikováno v:
International Journal of Industrial Ergonomics. 72:398-407
The user's forces have great influences on the load and on the drilling process of hammer drills. Hence, these influences must be known in product development for reproducible testing on test benches. Furthermore, manufacturers focus on developing ha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6cafe81de2414386e9496d456a3c4140
https://doi.org/10.1016/j.ergon.2019.06.016
https://doi.org/10.1016/j.ergon.2019.06.016
Autor:
Richard L. Neitzel, Alan Barr, David Rempel, Michael R. Cooper, Bernard J. Martin, Andrea Antonucci
Publikováno v:
Applied Ergonomics. 74:31-36
Objectives Both pneumatic rock drills and electric rotary hammer drills are used for drilling large holes (e.g., 10–20 mm diameter) into concrete for structural upgrades to buildings, highways, bridges, and airport tarmacs. However, little is known
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::319cdf2369e1525c23f46bf2e917d031
https://doi.org/10.1016/j.apergo.2018.08.005
https://doi.org/10.1016/j.apergo.2018.08.005
Publikováno v:
Journal of Marine Science and Engineering, Vol 9, Iss 676, p 676 (2021)
Journal of Marine Science and Engineering
Volume 9
Issue 6
Journal of Marine Science and Engineering
Volume 9
Issue 6
In situ protection and conservation of the Underwater Cultural Heritage are now considered a primary choice by the scientific community to be preferred, when possible, over the practice of recovery. The conservation of the artefacts within their envi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd4ab7bb9d442661b45913a8db9711f9
https://www.mdpi.com/2077-1312/9/6/676
https://www.mdpi.com/2077-1312/9/6/676
Publikováno v:
Geofluids, Vol 2021 (2021)
A reverse circulation Down-The-Hole (DTH) hammer drill bit in Casing-while-Drilling (CwD) processes is designed and applied to drilling under complicated formation. The drill bit is a special retractable drill bit with an exclusive reverse circulatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::00bf9d3ac72fb23faa957a3fefba3fc5