Tool driving or impacting – Processes
Patent
1990-03-26
1992-06-16
Watts, Douglas D.
Tool driving or impacting
Processes
173 7, 173 8, 173 11, E21C 112, B23Q 500
Patent
active
051218020
ABSTRACT:
The invention relates to a method and an arrangement for adjusting the percussion and the feed of a rock drilling apparatus with respect to each other. In the method, the volume flow of pressure fluid to be supplied to a percussion device (7) and a feed motor (8) is adjusted on the basis of the feed pressure of the feed motor (11), a volume flow adjusted pump (1) being controlled so that the ratio of the pressure applied to the persussion device (7) to the pressure of the feed motor (11) is set by control valves (10, 14). In the arrangement, pressure fluid is supplied to the percussion device (7) and the feed motor (11) by means of a volume flow adjusted pump (1). The arrangement further comprises control valves (10, 14) by means of which the volume flow of the pressure fluid fed by the pump (1) is kept such that the ratio of the pressure of the percussion device and that of the feed motor (11) remains substantially constant.
REFERENCES:
patent: 3561542 (1971-02-01), Hanson
patent: 3823784 (1974-07-01), Feucht
patent: 3979944 (1976-09-01), Salmi et al.
patent: 4064950 (1977-12-01), Salmi et al.
patent: 4074771 (1978-02-01), Morrison
Rajakallio Pauli
Rajala Rauno
Dexter Clark F.
Oy Tampella
Watts Douglas D.
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