Arrangement for controlling tension in a winch cable connected to rock drilling equipment
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United States of America Patent
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-
Jan 11, 2000
Grant Date -
N/A
app pub date -
Nov 19, 1997
filing date -
May 19, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
An arrangement for controlling a winch cable connected to rock drilling equipment, the arrangement including the winch; a pressure fluid motor arranged to operate the winch; a pressure fluid pump for operating the pressure fluid motor; a pressure-controlled pressure relief valve installed between a pair of pressure fluid channels connected to the pressure fluid motor for setting a counterpressure of the pressure fluid motor when pulling the cable off a drum; and control means for controlling counterpressure of the pump; wherein the pump is a pressure-controlled volume flow pump and the control means comprise an adjusting device with which a control pressure prevailing in a control channel of the pressure relief valve can be adjusted for setting a limit pressure of the pressure relief valve and thus the counterpressure of the pressure fluid motor.
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