Design of a Pendulum Prototype for Dynamic Testing of Material Removal Using Picks

María-Belén Prendes-Gero, Celestino González-Nicieza, Covadonga Betegón-Biempica and Martina-Inmaculada Álvarez-Fernández
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María-Belén Prendes-Gero: DinRock Group, University of Oviedo, 33003 Oviedo, Spain
Celestino González-Nicieza: DinRock Group, University of Oviedo, 33003 Oviedo, Spain
Covadonga Betegón-Biempica: Construction and Manufacturing Engineering Department, University of Oviedo, 33203 Gijón, Spain
Martina-Inmaculada Álvarez-Fernández: DinRock Group, University of Oviedo, 33003 Oviedo, Spain

Energies, 2021, vol. 14, issue 20, 1-14

Abstract: The need for large and fast excavations, together with noise and vibration limitations, means that mechanical removal is increasingly used rather than blasting. In mechanical removal, the cutting tools hit the rock and penetrate it, and then move in the direction of cutting, dragging and detaching a portion of rock called chip. Most research on mechanical removal approaches it as a static process without taking into account the speed at which the cutting element impacts the rock. This work presents the design of a pendulum equipment capable of simulating the impact of a cutting element, specifically a pick, against a rock, reproducing the removal in a similar way to how it is carried out in real excavations. Cutting tests are carried out with concrete samples with a cement/sand ratio of 1:1 and 3:1, the volume of material that is removed is calculated using a 3D scanner and images of the tests are collected with a high-speed video camera to facilitate the interpretation of the results. The results confirm the direct relationship between impact energy, chip size and cutting depth, prove the formation of an affected zone that allows to reduce the cutting energy, and empirically obtain the optimum cutting energy with which the maximum performance in mechanical removal would be achieved.

Keywords: mechanical removal; picks; pendulum; specific energy; dynamic cutting; optimum cutting energy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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