Method for controlling percussion device, software production, and percussion device
AssigneeSandvik Mining and Construction Oy
InventorsMarkku Keskiniva, Jorma Mäki, Aimo Helin, Mauri Esko, Erkki Ahola
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Abstract
A method and software product for controlling a percussion device belonging to a rock-drilling machine, and a percussion device. The impact frequency of the percussion device is set so that the percussion device forms a new compression stress wave to the tool always when reflected waves from the previous compression stress waves reach a first end of the tool. This requires that the impact frequency be set proportional to the propagation time of the stress wave, whereby the length of the used tool and the propagation velocity of the stress wave in the tool material are to be noted.
Claims12
A method for controlling a percussion device, the method comprising:
- providing impact pulses with the percussion device during drilling to a tool connectable to a rock-drilling machine;
- and generating a compression stress wave to the tool to propagate at a wave propagation velocity dependent on the tool material from a first end to a second end of the tool, with at least some of the compression stress reflecting back from the second end of the tool as a reflected wave that propagates toward the first end of the tool;
- and
- controlling the percussion device in the rock-drilling machine and its impact frequency,
- selling the impact frequency of the percussion device proportional to the propagation time of the stress waves that depends on the length of the used tool and the propagation velocity of the wave in the tool material;
- generating with the percussion device a new compression stress wave to the tool when the reflected wave from one of the previous compression stress waves reaches the first end of the tool;
- and
- summing the new compression stress wave and the reflected wave to produce a sum wave that propagates in the tool at the propagation velocity of the wave toward the second end of the tool.
A percussion device comprising:
- means for generating a impact pulse to a tool, whereby a compression stress wave caused by the impact pulse is arranged to propagate from a first end to a second end of the tool, and at least some of the compression stress wave reflects back from the second end of the tool as a reflected wave and propagates toward the first end of the tool;
- a control unit for controlling the impact frequency of the percussion device,
- means for defining at least the impact frequency of the percussion device,
- and wherein the control unit is arranged to set the impact frequency proportional to the propagation time of the stress waves that depends on the length of the used tool and the propagation velocity of the wave in the tool material.
A percussion device comprising:
- means for generating an impact pulse to a tool, whereby a compressions stress wave caused by the impact pulse is arranged to propagate from a first end to a second end of the tool, and at least some of the stress wave reflects back from the second end of the tool as a reflected wave and propagates toward the first end of the tool;
- means for controlling the impact frequency of the percussion device,
- means for defining the impact frequency of the percussion device,
- means for steplessly and separately controlling the impact frequency and impact energy, and
- wherein the impact frequency of the percussion device is arranged proportional to the propagation time of the stress waves that depends on the length of the used tool and the propagation velocity of the wave in the tool material.
Dependencies are inferred from the claim text.