Excavating machines for excavating rock and minerals having firs

Details Excavating machines for excavating rock and minerals having firs Excavating machines for excavating rock and minerals having firs

1980-04-03

1982-03-30

Purser, Ernest R.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Of hard material disintegrating machine

173 9, 299 75, E21C 2724, E21D 908

Patent

active

043221130

ABSTRACT:
A excavating machine for excavating rock and minerals from a working face having a carriage with a boom support. A cutter carrying boom is moveably supported by the boom support, and a means is provided for moving the boom relative to the carriage. A drive means is included with a sensing control means for controlling the movement of the boom relative to the carriage. The sensing control means senses a parameter proportional to the reaction cutting force on the cutter. Control over the movement of the boom is provided in two alternative modes of control. A rate mode control for controlling the machine in accordance with a preselected rate of the output of the drive means is provided, as well as a load mode control in which the movement of the boom is controlled maintaining the reaction cutting force exerted by the cutter substantially at or below a certain value.

REFERENCES:
patent: 2334009 (1943-11-01), Jeffrey
patent: 2841379 (1958-07-01), Driehaus

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