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

Energies

Covadonga Betegón-Biempica¹  María-Belén Prendes-Gero²  Martina-Inmaculada Álvarez-Fernández²  Celestino González-Nicieza² 

[1] Construction and Manufacturing Engineering Department, University of Oviedo, 33203 Gijón, Spain;DinRock Group, University of Oviedo, 33003 Oviedo, Spain;

关键词: mechanical removal;    picks;    pendulum;    specific energy;    dynamic cutting;    optimum cutting energy;   

DOI  :  10.3390/en14206831

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown