Efficiency in hydraulic rockdrills and breakers. Operational characteristic and efficiency of hydraulic rockdrills and breakers.

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Other Title
  • 油圧さく岩機および油圧ブレーカの内部の効率　油圧さく岩機および油圧ブレーカの特性と効率に関する研究
  • ユアツ サクガンキ オヨビ ユアツ ブレーカ ノ ナイブ ノ コウリツ ユアツ
  • Operational characteristic and efficiency of hydraulic rockdrills and breakers
  • 油圧さく岩機および油圧ブレーカの特性と効率に関する研究

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Description

All factors affecting the efficiency in hydraulic rockdrills and breakers were studied by using actual manufactured articles with help of PV-diagrams and piston velocity diagrams. Effects of these factors on efficiency were possible to be estimated, though among the factors there was some difference by the type of the drill and of the breaker for volumetric, hydraulic and mechanical efficiency. Hence conclusions obtained were as follows.<BR>It is one of the most important factors for improvement of unavailable flow that kinetic energy of the returning piston is recovered. The recovery of this energy is prevented by fluid resistance for discharging hydraulic oil from the rear chamber of the rockdrill through the valve and by a restriction of the piston for sliding. The piston sliding resistance is mainly due to a tightning force of packing as to mechanical efficiency. The oil flow necessary for shifting the valve is unavailable flow, but may be relevant to the pressure loss in the drill. When we pay no heed to the other drill design requisite it may be the best valve for the efficiency that the sum of the above two losses is minimum.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 106 (14), 851-856, 1990

    The Mining and Materials Processing Institute of Japan

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