Longwall mining system

Details Longwall mining system Longwall mining system

1977-05-02

1978-10-10

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

Stabilizing underground structure

299 31, 299 43, 299 89, 405294, E21C 2724, E21D 2300

Patent

active

041193466

ABSTRACT:
This mining system utilizes a row of roof support units in conjunction with a row of conveyor sections and a continuous mining machine which rides on the conveyor sections. Each roof support includes a primary support shield supported on a base by means of jacks and a secondary support shield telescopically mounted to the primary support shield and having a wall engagement portion at the outer end to provide bearing support for the secondary support shield by the wall rather than merely by cantilever support. Each support unit is connected to an associated conveyor unit by a ram for moving said units relative to each other. The mining machine includes a kerf cutting member for creating a continuous ledge at the junction of the longwall and roof for supporting the secondary support shield wall engagement portion.

REFERENCES:
patent: 2699327 (1955-01-01), Cartlidge
patent: 2716025 (1955-08-01), Malloy et al.
patent: 3006624 (1961-10-01), Doxey
patent: 3097829 (1963-07-01), Seddon
patent: 3356417 (1967-12-01), Heyer et al.
patent: 3399927 (1968-09-01), Groetschel
patent: 3856356 (1974-12-01), Allen et al.

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