Method of and an arrangement for controlling rock drilling

Details Method of and an arrangement for controlling rock drilling Method of and an arrangement for controlling rock drilling

1988-03-21

1989-07-18

Massie, IV, Jerome W.

Boring or penetrating the earth

Automatic control

Of advance or applied tool weight

175220, 299 1, 173 4, 173 13, E21B 700, E21B 4400

Patent

active

048484857

ABSTRACT:
A method of and an arrangement for controlling rock drilling when a feeding beam (3) is displaced so that the forward end thereof makes contact with a rock surface to be drilled. The arrangement comprises a displacing device for displacing the feeding beam in the longitudinal direction thereof and a control device for controlling the operation of the displacing device. The control means comprise a control element which is mounted at the forward end of the feeding beam (3) so that when the feeding beam is displaced in the longitudinal direction, the control element is the first to make contact with the rock surface. The control element is connected to stop the operation of the displacing device of the feeding beam (3) when it hits the rock surface. The control element further comprises a detecting element (10) formed by a sleeve-like support and mounted slidably in the longitudinal direction of the feeding beam (3), which detecting element is displaced backwards with respect to the feeding beam (3) when it hits the rock surface; and a spring (12) which pushes the detecting element (10) to its forward position; and a detector (15) which detects the displacement of the element (10) and is connected to control the displacing device of the feeding beam (3).

REFERENCES:
patent: 4189183 (1980-02-01), Borowski
patent: 4484637 (1984-11-01), Mayer
patent: 4501199 (1985-02-01), Mashimo et al.
patent: 4534500 (1985-08-01), Jochum
patent: 4751971 (1988-06-01), Thompson

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