Automatic control system for rock drills

Details Automatic control system for rock drills Automatic control system for rock drills

1977-02-14

1981-06-30

Cohen, Irwin C.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

91318, 91356, 91433, 137486, 1374875, 173 19, B23Q 5033, E21C 510, F15B 1115, F15B 13042

Patent

active

042757932

ABSTRACT:
A rock drill feed system moves a drill toward and away from a wall with a reciprocating hydraulic motor powered by pressurized fluid. The pressurized fluid is controlled by a movable control valve that has a first position obtained manually to move the drill inwardly to drill, a second position obtained automatically when the drill has completed drilling, and a third position obtained automatically when the drill has been completely withdrawn. The sensing of the location of the drill to position the control valve is accomplished by measuring the pressure and flow rate of the hydraulic fluid delivered to the motor with pressure responsive switches. When the pressure exceeds a preselected level and the flow rate drops below a preselected level, the two pressure switches close to produce a signal that moves the valve to another position.

REFERENCES:
patent: 2735405 (1956-02-01), Hipple
patent: 2790340 (1957-04-01), Cross
patent: 2987886 (1961-06-01), Deering et al.
patent: 3727520 (1973-04-01), McKown et al.
patent: 3732887 (1973-05-01), Hayner
patent: 3865014 (1975-02-01), Van der Kolk
patent: 3875746 (1975-04-01), Elliott
patent: 3948146 (1976-04-01), Maurer et al.
patent: 4031813 (1977-06-01), Walters et al.

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