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Title: Air shooting system for the mining of coal or the like

Abstract

An air shooting system is disclosed for use in lieu of explosives in the mining of coal employing a set of tubular shooting heads fitted in respective shot holes in a coal seam. Each shooting head is fed with air under high pressure and has a valve mechanism for triggering discharge of the air when it reaches a predetermined pressure. The source of air pressure is connected to a manifold and automatic shut-off valves are interposed between the manifold and the lines feeding the individual shooting heads. Each shutoff valve has a movable valve element biased into a normally open position to permit flow of air from inlet to outlet but which is snapped into closed position and held there by the inlet pressure when there is a sudden drop in pressure at the outlet accompanying discharge at the associated shooting head. The shooting heads are set to trigger in series at incrementally spaced pressures until all of the shut-off valves are in closed condition. A manual reset valve interposed between the source and the manifold cuts all flow from the source for resetting of the shut-off valves and prompt simultaneous venting of the lines feeding the shooting heads inmore » readiness for a successive shot.« less

Inventors:
Publication Date:
OSTI Identifier:
5961655
Patent Number(s):
US 4301731
Assignee:
Zeto Ind Inc
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 12 Sep 1979
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL MINING; FRACTURING; MINING EQUIPMENT; DESIGN; BOREHOLES; COAL SEAMS; COMPRESSED AIR; HIGH PRESSURE; VALVES; AIR; CAVITIES; COAL DEPOSITS; COMMINUTION; COMPRESSED GASES; CONTROL EQUIPMENT; EQUIPMENT; FLOW REGULATORS; FLUIDS; GASES; GEOLOGIC DEPOSITS; MINERAL RESOURCES; MINING; RESOURCES; 012000* - Coal, Lignite, & Peat- Mining

Citation Formats

Fitzgerald, J E. Air shooting system for the mining of coal or the like. United States: N. p., 1981. Web.
Fitzgerald, J E. Air shooting system for the mining of coal or the like. United States.
Fitzgerald, J E. 1981. "Air shooting system for the mining of coal or the like". United States.
@article{osti_5961655,
title = {Air shooting system for the mining of coal or the like},
author = {Fitzgerald, J E},
abstractNote = {An air shooting system is disclosed for use in lieu of explosives in the mining of coal employing a set of tubular shooting heads fitted in respective shot holes in a coal seam. Each shooting head is fed with air under high pressure and has a valve mechanism for triggering discharge of the air when it reaches a predetermined pressure. The source of air pressure is connected to a manifold and automatic shut-off valves are interposed between the manifold and the lines feeding the individual shooting heads. Each shutoff valve has a movable valve element biased into a normally open position to permit flow of air from inlet to outlet but which is snapped into closed position and held there by the inlet pressure when there is a sudden drop in pressure at the outlet accompanying discharge at the associated shooting head. The shooting heads are set to trigger in series at incrementally spaced pressures until all of the shut-off valves are in closed condition. A manual reset valve interposed between the source and the manifold cuts all flow from the source for resetting of the shut-off valves and prompt simultaneous venting of the lines feeding the shooting heads in readiness for a successive shot.},
doi = {},
url = {https://www.osti.gov/biblio/5961655}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 24 00:00:00 EST 1981},
month = {Tue Nov 24 00:00:00 EST 1981}
}