Process for controlling the movement of an universally swivellab

Details Process for controlling the movement of an universally swivellab Process for controlling the movement of an universally swivellab

1986-09-22

1988-01-26

Suchfield, George A.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Of hard material disintegrating machine

299 75, E21C 2506, E21C 3524

Patent

active

047213400

ABSTRACT:
A process for controlling the movement of a universally swivellable cutting arm of a partial cut, cutting machine, comprising a first hydraulic drive for lifting and lowering the cutting arm, and a second hydraulic drive for swivelling the cutting arm transversely to the lifting and lowering direction, consistent at the end of the advancing movement of the cutting head in one direction or both directions. The respective other drive is, in particular, when having attained the nominal profile, simultaneously supplied with pressurized fluid. Conveniently, a predetermined volumetric amount of pressurized fluid is pressed into the other drive on occasion of a reversal of the cutting direction. A control device for performing this process includes a stepped piston, which can be subjected to the action of pressurized fluid at times via a centrally arranged working chamber and at times via a separate annular chamber having a greater radius, and comprises controllable valves which selectively connect the centrally arranged working chamber of the stepped piston at that side of the stepped piston which is located opposite the inlet for pressurized fluid with a drive of the cutting arm acting in a direction being different from the direction of action of the other drive, being simultaneously supplied with pressurized fluid, for the cutting arm.

REFERENCES:
patent: 4023861 (1977-05-01), Schnell
patent: 4027210 (1977-05-01), Weber
patent: 4033626 (1977-07-01), Dinkelbach
patent: 4261617 (1981-04-01), Droscher et al.
patent: 4285546 (1981-08-01), Etherington
patent: 4343512 (1982-08-01), Heitkamp et al.
patent: 4367898 (1983-01-01), Oven et al.
patent: 4412700 (1983-11-01), Zitz et al.
patent: 4588230 (1986-05-01), Schupphaus

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