Mining or in situ disintegration of hard material – Processes
Patent
1991-10-11
1993-08-10
Bagnell, David J.
Mining or in situ disintegration of hard material
Processes
399 31, 399 33, 399 75, E21C 3110, E21D 910
Patent
active
052342573
ABSTRACT:
A mobile mining machine for cutting a tunnel in rock has a wheel-like cutterhead assembly supported by a pitch boom assembly that causes movement of the cutterhead assembly in the vertical plane. A swing boom assembly supports the pitch boom assembly and is supported by the main frame of the mobile mining machine. In one embodiment the swing boom assembly has a pivot axis that is tilted from vertical and swings the cutterhead and the pitch boom during mining to cut a tunnel having a wide, flat floor. During mining, a gripper assembly having a floor gripper shoe and a roof gripper shoe brace the mobile mining machine in the tunnel. Thrust is provided by thrust cylinders located between the gripper shoes and the main beam. Extension of the thrust cylinders moves the cutterhead assembly, main beam, and rear portion of the mobile mining machine forward relative to the gripper assembly due to slidable engagement of the main beam and gripper assembly. During re-gripping, the gripper cylinders and thrust cylinders are retracted, causing forward movement of the gripper assembly with respect to the main beam and rear portion of the machine.
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Boyd Robert J.
Sugden David B.
Turner John
Bagnell David J.
The Robbins Company
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